Finally got out to the track last night!!...Updated!!!
#1052027
08/13/11 11:51 AM
08/13/11 11:51 AM
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Joined: Apr 2009
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mshred
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And I had a blast!!! The car does need to be tuned more, but that is why I went, to try and dial it in. However, as much as fun as it was, I believe there is still more in the car due to the mph I was getting (I cant seem to find a chart that converts mph to ideal e/t, but i did do the 1320/mph calculation to get close). Im thinking I am having some suspension issues and possibly need to alter the jetting in the carburetor. I was getting about 13-13.2 AFR according to my wideband in 4th gear at about 4900-5300rpms (kinda hard to watch the gauge during the rest of the run, and i cant datalog it right now since the cord i have doesnt work). Anyways here is a rundown of the night...my foot did not come off the throttle on any of the shifts, and I had a blast! Stick cars rule! Pass#1- Caltracs with 0 preload (bars just touching), rancho rear shocks on 7, 9psi in my e/t streets (no tubes, and yes, its a crappy gauge so the numbers are abnormally low- on my buddies decent analog gauge that equates to 14 psi in the tires), half tank of gas, launching at 4000rpm off the two step and shifting at about 6000rpm R/T .000 60' 1.88 1/4 12.936 MPH 107.15 Pass #2- Same as Pass #1 R/T .285 60' 1.888 1/4- 12.932 MPH- 106.72 Pass #3- Same as first two passes, this time leaving off the two step at 4500rpm R/T .278 60' 1.807 1/4 12.734 MPH- 107.59 Pass #4 Same as all other passes, 5000rpm launch R/T .505 60' 1.753 1/4 12.67 MPH 107.94 Pass #5 (best pass of the night)- Same as pass #4, but rear shocks tightened two clicks to 9 (max) R/T .390 60' 1.742 1/4 12.615 MPH 108.43 Pass #6- Same as pass #5 but tried lowering 8psi instead of 9psi in the tires (according to my crappy gauge). Blew the tires right off and almost went straight into the wall. I got out of it in a hurry and ended up with a 14.49 e/t and 89mph...just happy it wasnt a disaster Pass #7- Same as pass #5 R/T .145 60' 1.776 1/4 12.71 MPH 107.69 What do you guys think? I feel the car has more E/T in it, especially after that surprising mph on pass #5. I am getting some air under the front tires on launch, but I kept feeling a bog from start to end of night (why I kept raising my launch rpms). It got better the higher i went, but it was still there ever so slightly. I also think I need to possibly add some preload to the bars. Also, how normal is it to have fire coming out the exhaust sitting on the two step and powershifting? Im going back out to the track next week, so any suggestions for tuning are appreciated! Overall I am VERY happy with how the car is performing and I'd like to give a big thanks to everybody on here who has given me a hand with all the questions ive asked, and most of all Brian at IMM engines (member OU812) for setting me up with a killer head and cam combo that is what really make this engine what it is. I built this engine for 3k, with a bone stock bottom end, and I couldnt be happier, especially considering I think it still has more in it. I drive it everywhere and constantly get asked if its a big block lol Thanks everybody
Last edited by mshred; 08/21/11 01:25 PM.
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Re: Finally got out to the track last night!!...
[Re: Mr.Yuck]
#1052029
08/13/11 12:05 PM
08/13/11 12:05 PM
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Quote:
you need more air in those tires...your mph should be good for low low 12's.
what is the set-up? engine car? It's hard to lookat the gauges...lol I was just keeping an eye on my fuel pressure and tach last night. I think I might add a shift light under the cowl so all I see is a flash.
Hey man, I am currently uploading some vids on youtube right now that I will post shortly that give a better idea of how it was leaving...it was 9psi on my crappy gauge, but 14 on a good one. I was told that these tires will like somewhere around 14-16psi in them, so i think im close. On my best pass it almost seemed like hooked and then bogged...But it definitely didnt like less than that though since pass #6 was a writeoff when i tried
Setup is a 71 plymouth scamp, all steel 3400lbs me in it. 91 360 hydraulic roller motor, stock bottom end, RHS heads prepped by Brian at IMM, custom hydr. roller cam from Brian at IMM, 750HP holley carb, 4.10 dana 60, A833 4 gear with a centerforce clutch and a v-gate
Car has caltracs, stock 6cyl springs, ranchos out back, /6 t-bars up front with RMS adjustable UCA's and calvert 90/10 shocks, on a 28x12.5 ET street tire
Yea watching the gauges is hard, all I really got to look at was my rpm's coming to the traps and a quick peak at my AFR coming to the traps as well. I wish I had gotten a playback tach when I bought one..Im going to try and get the proper chord for my AFR gauge for this coming weekend as im going to the track again and would like to datalog
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Re: Finally got out to the track last night!!...
[Re: tboomer]
#1052031
08/13/11 12:11 PM
08/13/11 12:11 PM
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Quote:
Glad you had fun!! I would invest in a good tire gauge..Keep playing with it and you will drop your et!!
thanks! I ordered a Moroso tire gauge earlier in the week, but it didnt come in on time for the track. I should have it though for this next weekend coming up
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052032
08/13/11 12:11 PM
08/13/11 12:11 PM
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Joined: Aug 2003
Posts: 4,682 On the parachute mount
n20mstr
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sounds good work on that 60 foot and you going low 12s for sure
i think you can loosen the rear shocks a lil.
on Joes car on motor we run the rear shocks on 3 and it dont spin at all....you do have a stick but i think you can loosen them a tad
....BAD A$$ STREET CAR.....
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Re: Finally got out to the track last night!!...
[Re: n20mstr]
#1052034
08/13/11 12:21 PM
08/13/11 12:21 PM
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Quote:
sounds good work on that 60 foot and you going low 12s for sure
i think you can loosen the rear shocks a lil.
on Joes car on motor we run the rear shocks on 3 and it dont spin at all....you do have a stick but i think you can loosen them a tad
Hey Tony, thanks! I talked with Joe on facebook about the duster, he's haulin with it man!
Im getting some vids up so i will post them here and you guys can take a look. The time's got better when I stiffened the shocks up to 9 from the 7 I had them on. And I've seen other stick guys say they needed them stiff too. Maybe next time out I will try them on 5 or 3 and just see what happens though
What did Joe 60 on the motor again? I did a calculation of 1320/ my best mph (108.43) and it says that everything perfect I should be able to run a 12.1 or around there. If I can do that I will be one happy kid lol
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Re: Finally got out to the track last night!!...
[Re: Mr.Yuck]
#1052035
08/13/11 12:24 PM
08/13/11 12:24 PM
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Quote:
If it bogged you might need more pump shot???
pump shot as in squirter, or as in pump cam?
its got 35 squirters in it right now, primary and secondary. 3.5PV and 75 primary jet, 76 secondary jet. Used to have a 78 secondary in it, but it was running quite a bit richer with that in it. Once I get some solid AFR numbers I think I will have a better direction for jetting
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052036
08/13/11 12:31 PM
08/13/11 12:31 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Quote:
Quote:
If it bogged you might need more pump shot???
pump shot as in squirter, or as in pump cam?
its got 35 squirters in it right now, primary and secondary. 3.5PV and 75 primary jet, 76 secondary jet. Used to have a 78 secondary in it, but it was running quite a bit richer with that in it. Once I get some solid AFR numbers I think I will have a better direction for jetting
I'd think you need more rear jet. I ran 74/80 in a very mild 340 w/ 28 squirts... try 82's. I'd think that thing would need more than 78's. why is the PV so low, what's the vacuum at idle? I don't know much about AFR gauges, had one in a boosted car but never saw the need w/ a carb...just simple I guess.
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052037
08/13/11 12:40 PM
08/13/11 12:40 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
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Well friday night at cayuga is not known for great traction especially after the street cars (especially front drives) have a couple hours to drag water up to the line! What were your 1/8 mile times and MPH's?
Last edited by Dodgem; 08/13/11 12:41 PM.
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Re: Finally got out to the track last night!!...
[Re: Mr.Yuck]
#1052038
08/13/11 12:41 PM
08/13/11 12:41 PM
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Quote:
Quote:
Quote:
If it bogged you might need more pump shot???
pump shot as in squirter, or as in pump cam?
its got 35 squirters in it right now, primary and secondary. 3.5PV and 75 primary jet, 76 secondary jet. Used to have a 78 secondary in it, but it was running quite a bit richer with that in it. Once I get some solid AFR numbers I think I will have a better direction for jetting
I'd think you need more rear jet. I ran 74/80 in a very mild 340 w/ 28 squirts... try 82's. I'd think that thing would need more than 78's. why is the PV so low, what's the vacuum at idle? I don't know much about AFR gauges, had one in a boosted car but never saw the need w/ a carb...just simple I guess.
Vacuum at idle is 6.5 (the cam is very rough). Stock jetting for this carburetor was 75p, 80s. Reason I jetted down was because I was getting 10.8 at WOT in 1st and 2nd gear on the street, which is way too rich. But until I can datalog this, I really can't truly monitor what its doing. I picked up the AFR gauge to try and tune my cruise a/f since this is a street car- plus it doesnt hurt to use it for tuning WOT and idle as well. Obviously I still need to read the plugs though
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Re: Finally got out to the track last night!!...
[Re: Dodgem]
#1052039
08/13/11 12:42 PM
08/13/11 12:42 PM
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Quote:
Well friday night at cayuga is not known for great traction especially after the street cars (especially front drives) have a couple hours to drag water up to the line!
yea, i know, but what can you do right? I wanted to go, and it was the only time I could. Today is an OSCA weekend, with qualifying starting at around 2, so i figured i'd get more runs in on a non even night than an event day. Going back next Friday probably, and possibly staying over for the saturday test and tune as well
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Re: Finally got out to the track last night!!...
[Re: mshred]
#1052043
08/13/11 01:58 PM
08/13/11 01:58 PM
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Right now your off about 1/2 a second for the ET to MPH... as you seen with the increase in RPM your 60' was getting better so continue in that direction and that should take care of the bog(small block doesnt have a ton of torque)... once you get the best 60' with RPM then start changing the preload on the caltracs to tweek it in more..... you slowed the 60' by dropping the tire pressure so you know you went the wrong way, so start going up..... also the jetting you have should be higher on the secondaries (about 7 jet sizes bigger than a PV jet setting)...... keep playing
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