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Old 09-16-17, 08:39PM   #301
meanone
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So close to a 9! Put some video up if you have it.
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Old 09-16-17, 11:37PM   #302
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Quote:
Originally Posted by meanone View Post
So close to a 9! Put some video up if you have it.
If I can put the 1.40 60fts I've had in the past together with this pass it should be about at 9.75.

But it may be a little while before I try anymore 1/4 passes at this track. The shutdown area is short and is more gravel then anything at the end. I laid into the brakes as hard as I could and still ended up in the gravel. Scared the crap out of me. Stopping a 4000 lb car from 137 in that short area is gonna take a brake upgrade and/or significant weight lose.
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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Old 09-17-17, 01:00AM   #303
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Did some suspension work to mine to work on my 60' too. Went to the track last weekend. Ended up burning the clutches in my transmission. Sent the converter back to PTC for tightening. How loose is your converter? What does it go to on the trans brake with no 2step?
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Old 09-17-17, 03:02AM   #304
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With the M/T pro tires I launch off t-brake with 2 step at 5000 RPM. Convertor slips about 6% through traps. PTC did a great job building my convertor.
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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Old 09-18-17, 12:00AM   #305
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Default Converter slippage

Meanone. This is a screen shot of my racepak graph that shows the Engine RPM, Driveshaft RPM and boost.

Launch is off t-brake at 4600 RPM. The converter is tight enough that is pulls the motor RPM down. Trough traps Engine RPM is 5500 and Driveshaft RPM is 5200. About 5% converter slippage.

If I launch from idle the stall is pretty low with no boost.
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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Old 09-18-17, 01:22AM   #306
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Originally Posted by 7D9TA View Post
Meanone. This is a screen shot of my racepak graph that shows the Engine RPM, Driveshaft RPM and boost.

Launch is off t-brake at 4600 RPM. The converter is tight enough that is pulls the motor RPM down. Trough traps Engine RPM is 5500 and Driveshaft RPM is 5200. About 5% converter slippage.

If I launch from idle the stall is pretty low with no boost.
Thankyou. I don't want to mess up your thread with my stuff. The graph helps me out. My converter is definitely too loose. Mine does not fall back like that. Mine is only falling back 500-600rpm. I'm gonna have PTC tighteN mine 1,000rpm.
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Old 09-19-17, 12:24AM   #307
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Quote:
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Thankyou. I don't want to mess up your thread with my stuff. The graph helps me out. My converter is definitely too loose. Mine does not fall back like that. Mine is only falling back 500-600rpm. I'm gonna have PTC tighteN mine 1,000rpm.
No problem. This thread is pretty much dead as a build thread. Its more of a BS about my car thread now. You, JSPONT, turbo69BIRD and I are the only ones to post on this in a long time.

Do you have a way to graph you runs for PTC to use to fine tune the converter?
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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Old 09-19-17, 09:27AM   #308
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I have been driving mine for a while now, I am going to a track rental in October to see what it can do. keeping my finger's crossed that I do not break the tranny on a sticky track!
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Old 09-19-17, 11:46AM   #309
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Quote:
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I have been driving mine for a while now, I am going to a track rental in October to see what it can do. keeping my finger's crossed that I do not break the tranny on a sticky track!
Get it working on 12 psi and you will have that 9 sec time slip your looking for...
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Old 09-19-17, 03:50PM   #310
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Quote:
Originally Posted by JSPONT View Post
I have been driving mine for a while now, I am going to a track rental in October to see what it can do. keeping my finger's crossed that I do not break the tranny on a sticky track!
Getting traction will help identify the next week link, that's for sure. I've been helping a friend get his 2004 Mach1 track worthy. He's running the 8.8 with Strange axles and Eaton carrier. He broke the stock axle a few years ago and upgraded. Unfortunately he did not beef up the housing. Broke the axle ????? off the center section last Friday. Traction can be a beotch...
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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Old 09-19-17, 03:55PM   #311
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Originally Posted by turbo louie View Post
Get it working on 12 psi and you will have that 9 sec time slip your looking for...
JSPONT, How much boost are you running now?

Turbo Louie, I know you run a ton of boost. What does your timing retard curve look like? What is the lowest timing you get to and at what boost?

I have base at 32. Start to pull timing at 3 PSI boost. Have 10 Degrees pulled by 10 PSI boost to get to 22 and let that same ramp continue. Now that I am looking to go over 14 Lbs I am not sure what the curve should look like or what the most timing I can safely pull is.
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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Old 09-19-17, 04:17PM   #312
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I am set on 12 right now, but on the street it is a spin fest.
I have a spooled S60 1350 joints, the week link is the tranny. It's is a ford toploader.
I have my timing locked at 25. I have nothing fancy like you guys!
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Old 09-19-17, 04:18PM   #313
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What gear do you have in that S60?
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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Old 09-19-17, 07:23PM   #314
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My compression ratio has changed from 8.2 to 1 to 9.7 to 1 so things are different these days . So for right now im set in my opinion conservatively with timing. I start pulling from 4 psi which at that point im 34 degrees. So from 4 psi pulling to 33 psi I end up with 22 degrees. But because of the way my map is set up it seems to interpolate to 21.5 .. I really need to get down to a dyno to really know where I should be. I know you're probably thinking that 21.5 is a lot for 33 psi, but I've played with it enough to know im safe. 33 psi is my old 40 PSI. I don't know your combination but it sounds like you're set really conservative if there's aluminum heads on your motor.. As long as your AFR and air inlet temps are in check you should be good with 24-25 degrees with pump gas.. Just my opinion of course..
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Old 09-19-17, 07:44PM   #315
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Good information. Thank you. My CR is 8:1 with alum heads. This past weekend my IAT was mid to high 80 degree range if I remember correctly. I run an A2A intercooler and Water/Meth. AFR bounced between 11.2 and 12.2. One of the other big down sides of Blow Through. It is easy and has got the job done. But inconsistent AFR has been the norm.

With the boost retard map I have I was probably at around 15 Deg timing at 14 lbs boost. I agree that I am VERY conservative but Im a coward and cant afford to build this thing again so I plan to sneak up on it. But based on your numbers I may be ultra conservative. Will have to play with the map and not pull timing as quick and see if the motor likes it.

Thank you again for the information. Very helpful.
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79 Trans Am
476 IAII, 88mm Garrett turbo. 4000 lb race weight.
Best pass so far 9.65 @ 140. 1.41 60 ft.
4 lbs boost on t-brake. 14 lbs going down the track.
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