Re: A trip to Milan dragway for some TNT
[Re: mopar dave]
#2697183
09/13/19 12:23 PM
09/13/19 12:23 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I don't want to (re)read through everything you've posted, but have a few questions:
1. What about your current converter do you think needs to be changed? If it flashes to 5K+ and only has 6% slippage, it sounds better than my Dynamic 9.5" with a 4500-flash and 8% slippage. And the fact that two well-respected converter companies suggested you not mess w/ the converter ought to carry some weight, IMO.
2. Have you considered changing to a clutch-type fan setup since the flex-flan has obviously cost you some significant HP? It won't free up as much as an all-electric fan setup, but it'll get some of what you lost back. The "old reliable" MP viscous fan kit works well.
3. I don't know what else you've done for testing carb jetting, but the AFRs in the high 13s you mentioned on mostly 93E10 fuel sound really lean to me. Have you tried bigger jets to see if the car slows down with an AFR closer to say 13.0? Oh, any chance your fuel system can't supply enough fuel on the top end?
4. What are you running for valve springs, retainers, pushrods, etc., and how do you have the springs set up given the lift you have? I'm wondering if you may be running into valve train instability at higher RPM...
5. Are you having any spinning issues off the line? Is the car launching hard & straight?
6. Has any of your tuning involved changing accel pump squirter sizes and/or pump cams, in addition to changing launch RPMs? Are you fighting any hesitation, etc.?
My $.02 (and sh!t-can it if you want) is that you haven't spent enough time figuring out the current combination of hard parts to know why the car isn't running where "everyone" seems to expect it should.
Part of why I mention this is because your earlier time slips from the new BB vs your old stroker SB showed the BB combination was better everywhere but the last 660'. It had a better 60, it was quicker & faster in the 1/8th, but it gave it all back on the last half of the track. That makes no sense to me, unless there's an issue that's choking it on the big end.
And now I'll go back under my rock and work on my own junk.
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Re: A trip to Milan dragway for some TNT
[Re: BradH]
#2697313
09/13/19 08:48 PM
09/13/19 08:48 PM
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Joined: Jan 2007
Posts: 8,031 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
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Thanks for replying Brad. When you talk to a vert shop and mention street, its the end for getting a good 60footing vert. They get stuck on that street thing. Lenny didn't recommend loosening, but said if I wanted he would loosen it a bit. It is going back to him. You need a 8" vert for what your doing. ATI says N/A engines need 8" convertors. Big power, big convertor. Power adder cars need 9, 9.5 or even 10" for big turbo engines making huge power. I don't think I have the room for the clutch fan. I have another idea for the electric fan as im looking for higher output fans than the spals 990cfm rating and I have an idea how to incorporate a T stat in the housing. First time out I was running good AFR's thru the traps with 12.3, 12.5, 12.7 and 13.2 on fastest pass when the temp dropped. I tried HS air bleed change which leaned things too far, .028 to a .030. Associate valve springs. I'm told by Todd at Compititionwedgeengines they are good quality springs and they produce some of the other big name springs out there. They are set up at 1.930 with 145# on seat and 410# open pressures. I spoke with Dwayne the other day, he did suggest pulling a couple and have them tested to be sure. No spinning. Car hooks great , goes straight without any hesitation and makes you think your breaking all the records til you get to the ticket booth. I just richened the rear jets 2 sizes since on straight 93 and no 110 in the mix it runs a tad leaner. I just bought 2 cans of unleaded 98 octane oxygenated to try. Not sure what that's about either with the loss at the end of the track. When I foot brake I have to hold the brake real hard to keep the car from moving. The vert feels tighter than when it was behind the SB, so its getting a loosening. I may try a different intake and I told Dwayne I wouldn't switch his cam out, I may down the road if nothing else works. This will be my winter project and try again in the spring.
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Re: A trip to Milan dragway for some TNT
[Re: mopar dave]
#2697397
09/14/19 09:22 AM
09/14/19 09:22 AM
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Joined: Jan 2003
Posts: 8,021 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,021
Tulsa OK
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its probably best you don't tell the converter people about the street part. I believe a good track converter is better on the street than a street converter is on the track. Run a cooler and drive smart and you won't have any issues.
68 Barracuda Formula S 340
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Re: A trip to Milan dragway for some TNT
[Re: BradH]
#2697495
09/14/19 02:34 PM
09/14/19 02:34 PM
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Joined: Jan 2003
Posts: 14,493 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
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683.7hp@6800 with std port heads and an ootb manifold........ and a less than optimal small venturi carb that tends to richen up slightly at the top end. A more optimized, slightly bigger carb....... along with some oxygenated fuel....... probably coulda squeaked a 7xx out of it.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: A trip to Milan dragway for some TNT
[Re: mopar dave]
#2697828
09/15/19 06:35 PM
09/15/19 06:35 PM
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Joined: Jan 2003
Posts: 14,493 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
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Expense doesn't really matter In that case....... a 572 Hemi should easily solve the problem.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: A trip to Milan dragway for some TNT
[Re: mopar dave]
#2698010
09/16/19 10:48 AM
09/16/19 10:48 AM
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Joined: Feb 2014
Posts: 1,701 central il.
second 70
top fuel
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top fuel
Joined: Feb 2014
Posts: 1,701
central il.
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Expense to a point. I'm not a rich guy by any stretch. Hey, wait a minute, A hemi would be real nice at the track and the car shows. You think you have a headache now just wait until you get a hemi. Lol
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Re: A trip to Milan dragway for some TNT
[Re: mopar dave]
#2698201
09/16/19 08:00 PM
09/16/19 08:00 PM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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Last edited by Cab_Burge; 09/16/19 08:04 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: A trip to Milan dragway for some TNT
[Re: Cab_Burge]
#2698229
09/16/19 09:35 PM
09/16/19 09:35 PM
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Joined: Jan 2007
Posts: 8,031 Mt Morris Michigan
mopar dave
OP
master
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OP
master
Joined: Jan 2007
Posts: 8,031
Mt Morris Michigan
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I have the up date pipemax 4.5. I'm am able to calculate csa port velocity. Its very low according to this program and suggest a cam in the 261/268*-.650/.600" with 42* of over lap. Sounds aweful small, but who knows. Gonna call hughes tomorrow and get there opinion.
Last edited by mopar dave; 09/16/19 09:36 PM.
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