83 Cutlass w/ 3.8L carbed turbo - take II

[techg8]

I added a 3.73 Monte SS rear to the car just because it was hanging around, and it really helps the car down low.

Its a bit much with the TH350 though. I will probably go to a 3.08 after some tuning.

it ends up the Chrome stock air cleaner hat is a flow restriction. I gained a half second at the track by removing it.

The car currently 60fts in 2.7sec, not stalling the converter. Green = mash pedal and go.

Best ET was a 16.5 quarter mile.
Boost was about 8

This was a good baseline to start from.

Now the tuning and messing around to get more boost in there begins. will advise.

 

[DoubleV]

16.5 with the 3.73's? What was your mph? Shouldn't you be spooling up the turbo at launch?

Add methanol injection and turn up the boost!

 

[techg8]

85.29 mph

The knock retard was kicking in, pulling timing and slowing me down I believe.

Timing, alcohol, and boost are where I am headed to tune for as much performance as I can get without detonation.

Yes starting off the line in the gas and brake a bit will give me a better start next time.

 

[liquidh8]

Don't know how I missed this thread. Very cool! I would grab a wideband before anything if you don't already have one. This way you can make sure your AFR is good, and not causing your knock (lean). Then maybe grab a Alky kit and off to the races.
A 2004r has a bit better first gear, and the overdrive. You could run that with some 3:42's or 3:73's and a 2800 rpm converter and really wake it up.

To automatically pull timing, you run run an MSD boost retard or something.

 

[techg8]

I realized my plug gap was set at .055 or so. From what I read, thats too much for a boosted engine. I am dropping the gap down to .032 or so.

I have a washer pump and a spray nozzle. I just need to work on the install and I will be spraying alcohol. Maybe I will be able to up the boost a bit.

 

[techg8]

dropping the gap to about 32 made a big difference.

I have also been playing a lot with the timing, cold air intake and a homemade alky spray. I am up to 11psi now.

I should have some more results soon.