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Old 06-23-16, 01:11AM   #211
turbo69BIRD
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Could it be blowing out the spark? Maybe need a cooler plug
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Old 06-23-16, 04:37PM   #212
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I can stomp my car from idle, no stumble, it is a tuning issue, he will figure it out, keep trying.
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Old 06-24-16, 12:54AM   #213
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Thx for the ideas guys. I went back to my datalog info and set carb back to the way that gave me a wideband reading that stayed between 11-11.5 at the hit of the throttle.
Then:
Went up one jet size all the way around
Checked the power valves. The rear was turned in about one full turn. I turned it out to 1.5 turns past flush. The front was out 1 turn. I also set it it at 1.5 out past flush,
Enriched the idle from mid 14's to mid-low 13's
Disabled the water/meth

The stumble is almost gone. I only did one little test hit so I'll know more tomorrow at the track. I'll reconnect the water/meth. If that is part of the issue Ill test the isolation solenoid.

Time to see what the tires think of 10 lbs boost. I also plan to add more timing little at a time.
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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.

Last edited by 7D9TA : 06-24-16 at 01:04AM.
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Old 06-24-16, 11:35AM   #214
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One full turn in should on the rear valve at about 8psi. The front one 1 1/2 turns out should open that one at about 3psi. Using both valves you're probably gonna be rich at wot. Just gotta check that. I'm glad that you're getting it straightened out! Are you gonna head back to the track soon? I like seeing updates! Lol!
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Old 06-24-16, 06:14PM   #215
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Quote:
Originally Posted by meanone View Post
One full turn in should on the rear valve at about 8psi. The front one 1 1/2 turns out should open that one at about 3psi. Using both valves you're probably gonna be rich at wot. Just gotta check that. I'm glad that you're getting it straightened out! Are you gonna head back to the track soon? I like seeing updates! Lol!
Thx. Ill keep that in mind as I tune this thing.

Heading back to a little 1/8 mile track tonight. I hope to get a some video. Ill post results tomorrow.

http://littleriverdragway.com/
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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 06-24-16, 07:38PM   #216
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Old 06-25-16, 08:04PM   #217
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7D9, you're killing me! How did you do last night?
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Old 06-26-16, 10:48AM   #218
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Had a great time at the track. Car ran well. The stumble is much better but still there. Unfortunately I had traction issues all night. I had to lift right after every launch. Still went a best of 1.71 60 ft. ET and MPH didn’t improve any. Still went 7.1 @ 99.
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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 06-26-16, 02:47PM   #219
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I se you've got 315 radials are the drag radials? My car hooks like glue at the track. Do they prep your track?
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Old 06-27-16, 12:37AM   #220
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Quote:
Originally Posted by turbo69BIRD View Post
I se you've got 315 radials are the drag radials? My car hooks like glue at the track. Do they prep your track?
Im running the 315 65 drag radials.

They were running a street car bracket night and the track prep was not great and got worse as the night went on.

I have appt on the 11th for chassis guy to help me with suspension. Make sure I have everything setup straight.

I might make the trip to San Antonio Raceway and make a few 1/4 mile passes after we verify the suspension.
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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 06-27-16, 10:07AM   #221
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Did you run it on 10 psi this time? What kind of shocks do you have on it? On my brother's backhalved Camaro he smoked the tires through second gear the first time out. My buddie adjusted his shocks to full lose and told him he was good. Tightened the shocks and dropped 2 1/2 tenths from the 60' on the rest of the runs that day.
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Old 06-27-16, 12:19PM   #222
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Quote:
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Did you run it on 10 psi this time? What kind of shocks do you have on it? On my brother's backhalved Camaro he smoked the tires through second gear the first time out. My buddie adjusted his shocks to full lose and told him he was good. Tightened the shocks and dropped 2 1/2 tenths from the 60' on the rest of the runs that day.
Boost was at 10. Iím running ladder bars (ladder links) with Afco coil overs. I worked my way from one extreme to the other on the shock adjustments but in pretty big changes each time. I may have jumped right over the area that it liked.
Given that in the past 5.5 years I have torn every bit of this car apart and changed almost everything on it, now I have a ton of things to look at. My tires are over 4 years old. Even though they donít have many passes the age of the rubber might be a concern. The car is HEAVY. My guess is about 3800 with me in it. The majority of that is on the nose. Iíll see what the chassis shop thinks and go from there. I have a lot of things to sort out on this thing thatís for sure.
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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 08-22-16, 11:28AM   #223
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Are you making any progress? Haven't heard from you in a while.
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Old 08-23-16, 12:19AM   #224
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Quote:
Originally Posted by meanone View Post
Are you making any progress? Haven't heard from you in a while.
Playing hurry up and wait.

Had chassis guy setup the ladder bars. He made several small changes. Got new 315/60-15 MT pro radials mounted and ready to go. Then it's rained every weekend. Hoping to try this Friday but right now its showing 60% chance of rain. This has been the craziest August ever in Central Texas.

Car is 3705 lbs without me. 58.22% on the nose. Sounds like a combined Driver and Car diet is in order.
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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 08-23-16, 01:51AM   #225
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Those tires are excellent. I have the the R's. Love'em. You're car and mine weigh almost the exact same. Mine weighs 3,620lbs without fuel, and holds 10 gallons. I agree with the diet! Good luck with it!
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