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Discussion Starter · #1 ·
60 percent of the time when i gun my tta it pops,sometimes its ok i tried the stock chip and i still knocks,i have a kn,3 inch downpipe,thrasher chip and an open exhaust the fuel pressure is set at 39 and all of the sensors are new,i run it on 93 or 94 octane only,can anyone help please?

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89 turbo trans am
thrasher chip
3 inch terry houston downpipe
open exhaust
20 psi
 

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Resident Idiot
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11,462 Posts
thrasher chip and an open exhaust the fuel pressure is set at 39
Bing, Bing, Bing..... Thrasher chips really needs 45psi fuel pressure. I bet that will help a lot once that is increased.

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Stock Block, Stock Cam, PTE-52, Champion Heads, V4, MSD50's, TH DP, JayJackson 62mm TB, 16position MaxEffort Chip. 3680# with Driver
12.0 @ 116.5mph w/20psi using 17.9* timing

mailto:[email protected][email protected]</A>
 

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Mine does the same thing from time to time. Fuel pressure did not affect mine, as I was running 39 psi vac off as well with the Thrasher chip.
It's worth a shot to up the pressure as Mike said.
You might want to try a different MAF just for kicks.
Maybe driver side engine mount is broken causing the downpipe to hit hard.
Just some thoughts.........

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Best time so far: 12.78 at 107.5mph on radials, 2.05 60 ft
Stock Turbo/IC/injectors.....
Car weight without driver 3610 lbs
Ported Ford IC on the way......... :)
 

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Fuhgeddaboudit
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18,613 Posts
This sounds like Boostmonster Dan and his import brother. You guys have a new toy?


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ED BAKER
87-T-TYPE, PT54,MSD50's,Crane Billet Roller,JE forged20over,P&P Heads,Manley valves,Hemco 65mm& Acu65TB,V2 FM, P.I.9.5 -7disc,Jimmys Trans, new times soon.
93 PARK AVE"SUPERCHARGED"
67RS/SS350 CAMARO
mailto:[email protected][email protected]</A>
http://www.modernmusclecar.net
 

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I want a Z06
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6,024 Posts
39psi Fuel Pressure and your also running 20psi on pumpgas? Thats the problem. Add 6lbs of FP to it and watch what happens.

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-Mike
1989 Turbo Trans-Am
[email protected]
Rebuilding Motor

1998 LS1 Trans-Am 6-Speed
[email protected] *Factory Stock*
 

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Discussion Starter · #6 ·
whats up ed,im actually inquiring about my friend ed's tta,but yes new toys abound

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89 turbo trans am
thrasher chip
3 inch terry houston downpipe
open exhaust
20 psi
 
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