Time slip analysis....? Rocky's inching toward the 10's

Posted By: Streetwize

Time slip analysis....? Rocky's inching toward the 10's - 04/13/14 06:32 PM

Mopars at the Rock yesterday. First time running off the 2 step with 3000 chip. Having brake modulating issues as the rear 11 x 2.5 drums aren't holding in the beams and are driving the car forward when I stage it.

Run 1

RT: .008 (nice!)
60' : 1.767
330': 4.706
1/8: 7.192
1/8 MPH: 98.66
1000': 9.368
1/4: 11.233
1/4 MPH: 119.23

Run 2

RT: .410 (hello? McFly?)
60' : 1.696
330': 4.607
1/8: 7.097
1/8 MPH: 98.06
1000': 9.286
1/4: 11.164
1/4 MPH: 119.00

I went right in and the other guy made me pay by burning me down. Joke's on him though since he redlit!

Once I get the brake issue sorted I'm sure I can go up on the chip to maybe 3400-3600 since Stephen Daurity has got the "hemi under glass" launch attitude sorted. If I get a sub 1.6 60 that I know is in there I can easily hit my 6.90/10.90 goal for the car. The heads really need the bigger lift similar duration Bullet grind I have on the shelf but to be honest the 414 runs really great as it is and it's so darn 'no fuss no muss' I'm pretty darn content to leave the motor as it is. It leaves clean and straight and it's more fun to drive than any 4 bracket cars I ever had...combined! And people really LOVE to root for it and flock to see it come back down the return road like nothing I ever had before...it's really fun having a Crowd Pleaser, I'm just glad people get such a kick out of it!
Y
The old Wallace mph calcs I think are out the window with the Rocky's less than swoopy aero through the traps. CD =.65!!! Using Wallace calcs and assuming roughly the same frontal area as a similar weight duster ( which is wider but much shorter and lower) and a lower CD of .5 the aero is costing me close to 50 hp and probably 3-4 tenths in the traps....oh well....sure is FUN though.

Had a Great time pitting with Chip and Steff and my buddy Ben in his 07 Charger R/T. It was a beautiful day, warm (low 80's maybe but there was a fairly nice breeze all day which kept it from feeling too hot.

Posted By: CompWedgeEngines

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/13/14 08:17 PM

Work more at that 60'.

Posted By: 383man

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/13/14 08:49 PM

I agree the 60 ft is off. Ron

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/13/14 08:55 PM

2 step and tightening/slowing the chassis reaction is already helping and I think it will help even more....once I get the brake issue I mentioned sorted. Then I can bump up the chip and get more leap off the line. Even still the 1/8 Mph and ET is fairly quick considering that soft of a 60'.

Posted By: B3422W5

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 12:19 AM

Pretty much any combo I have raced( assuming the convertor is right), leaving at just off idle, at 2000 rpm, or off a trans rake at varying rpm's the cars have always 60 footed within at most a hundredth or two no matter the launch rpm or type.
If your convertor is good, I would bet not re-inventing the wheel and leaving at 1800-2000 rpm off the Foot with the chassis not " tensed up" will or should result in as good and repeatable 60 foot as you are likely going to get.
At your ET, the 60 should be 1.50 ish or so. The fact you are so far from that and it's hooking makes me think launch rpm/ style isn't a place to be looking.

Posted By: Anonymous

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 12:54 AM

Quote:

Mopars at the Rock yesterday. First time running off the 2 step with 3000 chip. Having brake modulating issues as the rear 11 x 2.5 drums aren't holding in the beams and are driving the car forward when I stage it.

Run 1

RT: .008 (nice!)
60' : 1.767
330': 4.706
1/8: 7.192
1/8 MPH: 98.66
1000': 9.368
1/4: 11.233
1/4 MPH: 119.23

Run 2

RT: .410 (hello? McFly?)
60' : 1.696
330': 4.607
1/8: 7.097
1/8 MPH: 98.06
1000': 9.286
1/4: 11.164
1/4 MPH: 119.00

I went right in and the other guy made me pay by burning me down. Joke's on him though since he redlit!

Once I get the brake issue sorted I'm sure I can go up on the chip to maybe 3400-3600 since Stephen Daurity has got the "hemi under glass" launch attitude sorted. If I get a sub 1.6 60 that I know is in there I can easily hit my 6.90/10.90 goal for the car. The heads really need the bigger lift similar duration Bullet grind I have on the shelf but to be honest the 414 runs really great as it is and it's so darn 'no fuss no muss' I'm pretty darn content to leave the motor as it is. It leaves clean and straight and it's more fun to drive than any 4 bracket cars I ever had...combined! And people really LOVE to root for it and flock to see it come back down the return road like nothing I ever had before...it's really fun having a Crowd Pleaser, I'm just glad people get such a kick out of it!
Y
The old Wallace mph calcs I think are out the window with the Rocky's less than swoopy aero through the traps. CD =.65!!! Using Wallace calcs and assuming roughly the same frontal area as a similar weight duster ( which is wider but much shorter and lower) and a lower CD of .5 the aero is costing me close to 50 hp and probably 3-4 tenths in the traps....oh well....sure is FUN though.

Had a Great time pitting with Chip and Steff and my buddy Ben in his 07 Charger R/T. It was a beautiful day, warm (low 80's maybe but there was a fairly nice breeze all day which kept it from feeling too hot.

You can't be serious.....aerodynamics have very little impact at the speeds you are running....you just don't have enough steam.....for all the money you've thrown at it... imho

Posted By: BradH

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 12:54 AM

Quick comments vs. my old combination that ran 11.0s usually and squeeked into the 10.9s
- 60s were 1.51-1.53
- 1/8 ETs were 6.9s-7.0s
- 1/8 MPHs were 98+
- 1/4 ETs were 10.9s-11.0s
- 1/4 MPHs were 121-122

If you're looking for 6.9s/10.9s, in addition to the obvious 60-ft improvement required, I think you need to figure out why your 1/4 MPH is dropping off 2-3 MPH compared to mine since the 1/8 MPHs are comparable.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 02:09 AM

Uhhh....you bracket racer guys realize this thing is essentially a JEEP, don't you?

heavy full frame, heavy drive hubs and truck wheels up front, flat springs, etc.

And I believe that Aero drag startsr costing power (in terms of how much it takes to push it through the air relative to one another) long before 119 MPH, if it didn't why would auto companies spend TENS of MILLIONS every year on R&D for cars that can only legally travel 65 mph? There are engineering formulas for calculating the HP costs of Drag for speeds based on frontal area, CD and MPH, the numbers are what they are....and the 40-45 hp at 119 IS reasonably accurate for the .5 vs .65 CD Comparison I cited.....whether you choose to believe them or not is another thing though:

http://gtechprosupport.com/support/AeroDragCalc.htm

Use the same frontal area (say 25 sq ft) and just change the CD, A 4th gen Camaro is .29, a Duster is about .5 and a Daihatsu Rocky is .65.....at 60 mph the difference is 5 hp (18 vs 23.4) but at 119 it's 42.6! (182.6 vs 140). A .65 CD (in this 25 sq ft example) takes as much horsepower to push to 119 as a .5 cd does at 130.

As for the Wheaties for what I spent? LOL, I have less than a tenth of what the guy in the $85K Z06 had in his car that saw Daihatsu taillights all the way down the track, and Way Less than a lot of the 'bracket cars' I saw yesterday that were way slower than mine, I can promise you that. This thing has a full exhuast (with cut outs but they don't really help that much) and if not for emissions would be perfectly fine for driving on the street. And I'm pretty dang sure I could get just about every Net dime I have in this thing back out of it, it really wasn't all that much and I get "That thing is AWESOME, you wanna sell it?" offers just about everywhere I go. Not many racers I know can say that...

Also regarding power I'm running the same 98+ MPH that a lot of 6.90/10.90 combos are running (including Brad's "textbook" example of one)....and that's despite being 1.5-2 tenths slower in the 1/8th which is a couple MPH I gotta make up after 60'.....Plus I'm on drag radials....I suppose I could have bolted on the 26 x 9.50 Hoosier DOT Slicks in the trunk but I'm trying to go tens on real street legal radials.....jeez guys, cut the boy some slack!

If/when I get a 1.5-1.55 60' that will put me up and over 100 in the 1/8th.....but I'll bet you the 1/4 mph will still be slower than the old 1.24/1 'rule of thumb" ratio....I think that would be mainly due to my barn door aerodynamics but I guess I really must be a Dumb Azz. if you think it takes the same HP to push a jeep from 60 to 120 mph as it does a duster or Camaro....well.

With a loose front end this thing lifted the front wheels instantly off the line just like the Little red wagon, Now it's tight (maybe too tight but we'll see) and I'm sneaking up on the combination that will get me down the track safely....this thing has an 85" wheelbase boys and is 5'-6" tall at the top of the windshield.

I don't get it out much but every time I do, I have a freakin BLAST, and apparently so do a lot of other people who watch it run....I guess that's reward enough.

There's no pressure at all, if I win....the crowd LOVES it, if I lose....hey you just beat a Daihatsu! Congratulations!!

Posted By: sshemi

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 09:04 AM

How much does it weigh?
And yes the 60s are way off.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 02:41 PM

The Rocky weighs 2780 plus I'm 230 so a hair over 3000. It's got a full 6 point cage in it.

I think going to a shorter slick might help it some but I like running th4e drag radials.

I could put an 8" 4400 stall in it ( it has an Ultimate 9 1/2" that footbrakes to ~3600/ flashes to 4400) but with only an 85" Wheelbase it's a bit like buzzing open the chute on a brahma bull at the rodeo every time you try something new.

And although I think Don, you're right it could go quicker by shocking the chassis at 2000 and loosening the suspension back up, I'm much more concerned with launching in a controlled/predicatble way...even if it's costing me a tenth or more out of the gate. I'm more comfortable tuning off the 2-Step and preloading the chassis since I now know it's not gonna roll over on it's back.

If you look at the incrementals you can see that the 7.09/98 mph 1/8th mile is still pretty good power-wise....in spite of a 1.7-ish 60'. and I know if I put this exact same drivetrain in the exact same weighht A body like my 69 dart or 73 Duster the car would go 1.50's and easily hit a 6.80/10.80 ET. But (for me) it wouldn't be nearly as much fun. And you can dismiss the aero factor but believe me this thing feels like it's dragging a chute behind it once it's over about 80 compared to an A body, I don't care what motor is in it. There's 15" of air below the front bumper...static. but the Wow factor and the smiles it brings to people really offsets that by a ton. It's not Optimum right now....but it's not SLOW (almost 99 mph in the 1/8th) by any means.

I really set it up to run the 1/8th since that's what's mainly around here.

Attached picture 8111875-photo.JPG

Posted By: MoparBilly

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 03:19 PM

Wize,
I agree that getting greedy in the 60ft. with a dual purpose vehicle is not necessarily the best approach, very similar to our Drag Week rides that are on small drag radials. I'd be happy with 1.62-1.67 consistently, but that needs to be tied to a 4.50-4.55 in the 330. That 60-330 interval is the best place for improvement, and that will require getting the engine in it's happy place as quick as possible!

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 03:45 PM

Thanks Billy,

Yeah another tenth in the 330 would help, i might try the smaller stickier tire to get more RPM and wheelspeed since I'm not using up the 4.10's anyway on the big end. I wound up with the 30" (295/65-15) drag radials when i was running a 4.56 but i swapped to the 4.10 when i went to a low gear 904.

That's along the lines I was thinking, just trying to make the most of what i have right now...the key is to HAVE FUN doing it....which I already am...in Spades!!

Posted By: FlyFish

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 04:06 PM

Quote:

......If I get a sub 1.6 60 that I know is in there I can easily hit my 6.90/10.90 goal for the car. The heads really need the bigger lift similar duration Bullet grind I have on the shelf but to be honest the 414 runs really great as it is and it's so darn 'no fuss no muss' I'm pretty darn content to leave the motor as it is......

I agree if you can get that 60' time down into the 1.50's you will meet your goal. Your 1/8 mile MPH looks good for 11.0-10.9.

What size cam is in it now? I still have my little reliable street roller in my stroker and ran a new PB last week :-D (see sig for times)...who needs a big cam

Keep tuning, you'll get there.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 04:18 PM

Dave,

The cam is a low lift 'endurance' Cam Motion solid roller designed for the mid 90's Mopar 358" IROC daytonas. It's 261/268@.050 on 107 and in at 105 but it's only .585/.570 (gross) lift.

I have a 260/268 @ .050 Bullet with .668/645 lift which would be MUCH better suited to my head/intake flow....its on 108. As i saud i'd love to put it in but the motor just runs so good i hate to tear it open just yet....must be gettin' old, lol

Posted By: Thumperdart

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 05:21 PM

Quote:

:

2 step and tightening/slowing the chassis reaction is already helping and I think it will help even more....once I get the brake issue I mentioned sorted. Then I can bump up the chip and get more leap off the line. Even still the 1/8 Mph and ET is fairly quick considering that soft of a 60'.

I don`t know about this 2-step stuff but when foot braking my junk if I leave around 1500 rpm`s it seems to hit the vert harder w/less body seperation. If I leave bet. 2500-3000 the body seperates but if it hooks it et`s best there but that was before all of my new rear end mods so,................

Get the 60 ft. down and the et`s will follow.

Posted By: Locomotion

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 06:01 PM

FWIW, I swap my slicks from side-to-side after every race weekend. When I do that, I also lightly sand the shoes to eliminate any glazing that may be starting and readjust the brakes manually. I don't use self-adjusters. My theory is to make the rears harness the torque before it gets to the ground. Although important, the fronts only have a little patch from skinny tires to help hold the car on the line.

I turn the drums & smooth (or replace if worn) the shoes every year to insure everything is flat, whether you see anything or not.

I also use the cheapest shoes I can find. The seem to be the softest. Semi-metalic won't hold as well, especially when cold. I've also heard about buying 2 sets of shoes and using the ones with the most surface area on both, front and rear of the backing plate. Experimenting with master cylinders and/or a proportioning valve may help.

Wish I could offer some advice on the 60' times, but I have no experience in setting up a carb for use with a 2-step. I only footbrake.

Did you say it was like a Jeep? Short wheelbase? Got wheelie bars before you get it launching harder?

(Hope I didn't miss anything as I just quickly skimmed through the posts during lunch.)

Got a pic?

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 06:44 PM

Here's an old pic from the Rock 2 years ago. I replaced the scoop with a flat hood (in keeping with its Sleeper image)

Attached picture 8112100-Rockingham.jpg

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 06:47 PM

Early tuning effort....loose vert with a new Lenny Ultimate converter....was tough to keep from going into low earth orbit. Fortunately it didn't burn up on re-entry

Attached picture 8112104-7745137-RockyWheelie2.png

Posted By: BradH

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 07:01 PM

Quote:

Quick comments vs. my old combination that ran 11.0s usually and squeeked into the 10.9s
- 60s were 1.51-1.53
- 1/8 ETs were 6.9s-7.0s
- 1/8 MPHs were 98+
- 1/4 ETs were 10.9s-11.0s
- 1/4 MPHs were 121-122

Another data point from the next combination I built that ran on MT 275/60R15 ET Street Radials (rather than the 29" x 9" slicks I used before), 4.10s and weighed 3755#s w/ driver on the track's digital scales:
- 60s were 1.45s-1.47s
- 1/8 ETs were 6.6s
- 1/8 MPHs were 101-102
- 1/4 ETs were 10.5s
- 1/4 MPHs were 126+

Keep in mind this is my street car that I'd drive 70+ miles each way to the track and run w/ full 3" exhaust system on pump 93 E10. This is a footbrake combo which leaves best from no higher than 2000 RPM.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 07:07 PM

This pic might give you some perspective how tall the Rocky is....I'm 6'-2". you can see Chip
s cuda in the background.

Attached picture 8112134-IMG_0988.JPG

Posted By: Sport440

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 09:15 PM

My analysis is your 60 fts. about .2 off Your 1/8 98.6 MPH shows you have some power. If its got the power to run that MPH, its got the power to get a 1.5 60 ft.

Your right, for its slow 60 ft. it does come on hard at the 1/8.

But then it does die off some on the second half. You gained 20.58, and 20.94 on your two passes. Typically a normal car at that 1/8 MPH would be netting 24.5 MPH or so on the back half.

Could that be all just the Aero effects??, not sure really. Rocky doesnt seem to have a problem getting to 99 MPH with a slow 60. I feel its more the just a aero problem.

You get that 60 ft. where its got the power to be and find another mph or two on the back half and you will have your 6.9 and 10.9 duel purpose street car. That 1/8 mile 99 MPH tells us that.

Nice cool ride, fast too. Just needs dialed in like the rest.

EDIT, Just did the math from 99 mph to 120 difference between a .65 and .5 CD with the same 25" frontal area. The difference was 43 HP If I would of used the frontal area of a Duster it would be more like your 50 Hp number that you stated. 50 HP is plenty enough to knock down your back half MPH compared to a more normal back half. But thats no cause for your .2 slow 60ft.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 09:40 PM

Mike,

Thanks! That's the kind of analysis I need. 98.66 SHOULd equate to around 124 but (if the Aero .5 vs .65 is real and it's truly like 45 hp (or 500 extra pounds) maybe it's not really that far off. What areo factor is the wallace calculator based on? (I'm assuming a .5). I'm only going through the traps at just under 6000, I'm assuming about 11% slip. If it were an A body pure race combo I'd be using an 8" converter and be hitting 1.5's all day long. So a shorter tire will increase the wheelspeed inthe traps and use more "sweet spot"....so the combo is leaving some on the table but for 1/8th mile "fun brackets" (since it's showing signs of at least being consistent) it's almost perfect as is

The motor pulls hard, it feels like it's going downhill at the shift points but it does need that bigger lift cam...I'm probably leaving 30 on the table I'm sure....but I'm not really "missing it" like I would be if it was a Pure race car to me...it's funny.

If you look at the linear HP Drag curve just for accelerating from 100 to 120 at a .65 vs a .5....it's significant for 4 seconds. You also sense the drag as soon as you let off the power, it's like a Sail...I hardly need the brakes

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 10:01 PM

Mike,

Also the previous best before upgrading the fuel pump and a 2k roll-on launch was 11.39 @ 116.68 with a 1.79 60' and a 7.313 and 97.74 1/8th. The back half is at least proportional.

It's going quicker all the time, just chipping away at it!

Posted By: Sport440

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 10:08 PM

Quote:

Mike,

If you look at the linear HP Drag curve just for accelerating from 100 to 120 at a .65 vs a .5....it's significant for 4 seconds...

Bobby, yep just did and Edited my post before I saw this. Used 99 to 120 .65 vs .5 like you suggest. The difference was significant enough for your slower back half MPH.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 10:13 PM

It reminds me that my old Fluid Dynamics Professor once told us...."physics doesn't really care if you like the answer or not!"

Posted By: BradH

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 10:22 PM

Quote:

... 98.66 SHOULd equate to around 124...

Then an E-body probably isn't aerodynamically "optimum" either, considering I never saw more than 122 w/ that sort of 1/8 MPH.

How does an 85" wheelbase "brick" handle at almost 120 MPH?

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 10:31 PM

Brad,
If you watch the car go from behind it tracks as straight as a rail, the steering is really slow so it's not over-correction prone or 'twitchy'.

It's really fun, and once people see how quick it is I can see people running back to the stands to see it as soon as I roll toward the water box,...how cool is that?...that never happened with my Road runners, Cudas or Dusters! The announcers all remark "what the h&!! Is that?" the first time too.

Posted By: SomeCarGuy

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/14/14 10:46 PM

An air dam might not look too out of place on the sleeper.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/15/14 04:19 AM

Vid of Chip and me from Rockingham:

http://youtu.be/fbjUDUKjtrY

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/16/14 03:18 PM

Needed to add that with this car, er, SUV, er Thing! Just stomping it off the line from idle or 2000 RPM is just not going to work, the wheelbase is too short and the CG is too far back (essentially right over the front leaf spring eye)...so I've got to preload it to minimize the shock. It hooks and maybe an 8" vert with about a 4400 stall is the right way to go...there really is no wasted motion because the tires hook it's just the stall is lower than the torque peak (which is till now the sacrifice I've been willing to make to get off the line straight and clean).

I have a Bullet cam with near identical @ .050 specs but Much more aggressive ramps and about .080" (.668/.645 vs .585/.570) that I think will take better advantage of the Heads...it's just hard to make the case to swap it when it runs so strong as it is. I might take the rear cargo cover off and see what it does....it couldn't hurt the Aero!

Posted By: MR_P_BODY

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/16/14 03:42 PM

Quote:

Brad,
If you watch the car go from behind it tracks as straight as a rail, the steering is really slow so it's not over-correction prone or 'twitchy'.

Thats what I do on short wheel base cars.. I use a
longer steering arm to slow the steering.. its easy
to over steer a short car

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/16/14 04:01 PM

That's it exactly, mr P

On a short WB car your really driving the Pitch or the 'yaw' rather that steering it, it my ears are perpendicular to the lane I'm doing ok.

You can see in the video it tracks straight. I was really suprised to see the front tires are barely skating the asphalt for the first 40-50 feet, that tells me the motor wants a little more vert....not sure if I'm going to give in to it or not. I might try going to a dual plane to pick up 1/8th mile ET but I'll bet it may slow the mph on the big end. It's vexing....slowish out of the hole, goes like heck through the middle and then the air brake dynamics kick in on the top!

Posted By: MR_P_BODY

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/16/14 04:11 PM

Quote:

That's it exactly, mr P

On a short WB car your really driving the Pitch or the 'yaw' rather that steering it, it my ears are perpendicular to the lane I'm doing ok.

You can see in the video it tracks straight. I was really suprised to see the front tires are barely skating the asphalt for the first 40-50 feet, that tells me the motor wants a little more vert....not sure if I'm going to give in to it or not. I might try going to a dual plane to pick up 1/8th mile ET but I'll bet it may slow the mph on the big end. It's vexing....slowish out of the hole, goes like heck through the middle and then the air brake dynamics kick in on the top!

If your not above 6400 rpm then the dual plane would
help... and maybe even if your a bit higher because
of the time you would be up there... I know all to
well about aero.. we use to load a truck with a vertical
wall that we could crank up to load it HARD... pushing
a wall around takes plenty of power... and depending
on the size of that wall(frontal area) it starts
taking effect at lower speeds

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/16/14 05:10 PM

I really wish somebody make a BIG Dual Plane like the Indy 440-2D or like CHI makes for the Windsor fords. To use an Air-Gap would really be handicapping the Big 230CC ports of the Airwolfs

Posted By: BradH

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/16/14 05:14 PM

Quote:

... if my ears are perpendicular to the lane I'm doing ok.

Better not race w/ a head cold! You'll never know WTH is going on w/ your equilibrium all stuffed up.

Quote:

You can see in the video it tracks straight.

That's cool. I'm spoiled 'cuz The Mopig drives like it's on rails on the big end. Once I got the car to leave straight (CalTracs settings & rear tire pressure fine tuning), it became a pretty easy car to run down the 1320.

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/17/14 12:05 AM

Well I pulled Rocky back in the Garage, this weekend I might get a wild hair and swap the cam...so easy in this thing I can probably do it in an hour or even less

Torque should be as good or better and top end should hopefully pick up some via significantly increasing the duration above .550-ish lift.

Old

261/268
107LDA/105ICL
.585/.570

New

260/269
.668/.645
108LDA/104ICL

Head flow I/E

.100. 72/65
.200. 144/108
.300. 219/146
.400. 273/174
.500 301/205
.600. 312/212
.700. 316/236

Posted By: justinp61

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/17/14 12:25 AM

Flat solid or roller?

Posted By: Streetwize

Re: Time slip analysis....? Rocky's inching toward the 10's - 04/17/14 12:28 AM

Both Solid Rollers but I'll bet I could probably even run hydraulic rollers on the old cam....it's really an Endurance style circle track (allegedly 358" Nascar Trucks and IROC Daytonas) cam with 360 oiling grooves on the 2 & 4 journals....it would probably make an awesome street roller cam for my new 440 incher