Hello to those of you who remember, this is my twin-charged 96 Bonneville SSEi. Not much has changed since 2010, new larger turbine housing (1.34a/r), revised wastegate dump tube integrated into a new 4" downpipe, oh, and forged pistons and L32 rods. The block is still std bore. Stock crank. ARP studs and Cometic h.g'*. Same heads and blower, intercooler system is still the same. Best previous was 380whp on 15psi.
I spent alot of time and effort to set the engine up to monitor EGTs. The 3800 with stock log manifolds is very imbalanced and right now I am running log-style headers up to the crossover pipe. What I thought was poor cylinder balance was alot worse than I thought! The cylinders had as much as 100deg EGT spread! I won't say which was which, but suffice to say, after adding or taking away fuel to/from 5 of the 6 cylinders (I will say that cyl #3 was the "reference"), I am now making 425whp on the same 15psi! It is all in the design of the headers... (this winter I will be building a set of short-tube equal-length headers for it.)
So all of this resulted in a best 12.50@115 at the Pontiac Nationals last month. I was running ice in the interooler tank, race gas, and slicks. On the last run, I ticked off a few turns of the boost controller running the boost bypass valve, saw 20psi on the boost gauge, and ran a 12.05, on the brakes at the top-end
to keep from breaking out. (I did anyway, and lost the in the first round of eliminations) The mph was only 107 on that run... but the 12.05 would have easily been a high 11.80.
Here'* a link to the 12.50 run. I am taking the car to the Atlanta Dragway tonight to claim my 11-sec timeslip.
and this cool run, you can hear the turbo singing!
I know it will run 11'* because, I found out today, on 20psi combined boost and race gas with ice in the intercooler, the engine makes: