Operation Lipstick on a Pig

[fleming442]

Thanks for the kind thoughts. I was looking for road test results, and found this: https://www.thetruthaboutcars.com/2...eadly-sin-8-1984-pontiac-bonneville-brougham/ a proper lambasting of these cars- pretty funny. The donor Firebird was touted as a 15.70 1/4, the Bonne is 11lbs lighter with far less aerodynamicies, so I'm a lot further off ET than I expected. BUT, in the end, it's still different and consistent. It would definitely be something with forced induction.

 

[joesregalproject]

Did GM ever put a supercharger on a RWD 3800?

 

[fleming442]

Did GM ever put a supercharger on a RWD 3800?

In Australia, it happens. The trick is bringing the rear inlet forward to mount the throttle body. Holdens have them, but are apparently very popular.

 

[fleming442]

Winner Winner chicken dinner

 

[CaliWagon83]

I know it's probably buried somewhere in this thread, but what ratio rear-end do you have right now?

 

[DRIVEN]

 

[fleming442]

I know it's probably buried somewhere in this thread, but what ratio rear-end do you have right now?

They're 3.42s out back, still open, no posi.

 

[olds307 and 403]

They're 3.42s out back, still open, no posi.

Are you getting much wheel spin? How is the compression and tune on the 3800? I agree, especially with the 4L60E's first gear it should be a second faster in the 1/4, close to that 15.7 number. You have a better than stock intake and exhaust too, correct?

 

[fleming442]

No, it doesn't spin at all on 245s. I was only doing a burnout because the kid at the water box insisted on having a 1/2 inch of standing water in there.
It's listed as 9.4:1, and I sent the computer to ZZ Performance for their stage 1 tune, whatever that is. No speed governor, upped trans line pressure and shift points, and a too rich AFR is all I can tell after 75,000 miles. Add 91,5 to that, and there's 166k hard miles plus a dingleberry hone on the bores. It's pretty loose.
The intake is a section of 3" PVC, a 4.3 S-10 airbox, Carquest red filter, and corrugated GM elbows. Exhaust is the factory y-pipe, 3" Jones racing bullet muffler, down to 2.5" Borla Pro XS, and tailpipe.

 

[olds307 and 403]

Really no wheel spin? Yeah, your 2.5+ 60 ft is a problem. I had 2.6 to 2.8 60 ft on stupid 245/60R14 tires behind my 403. Borrow your slicks off your 67, maybe there is some. With a 3.42 open I managed a best of 2.0 60 ft with MT ET Street Bias 26-10.5-15 tires with a 9.5 ti 1 too small cam Olds 350 running 9.4 in the 1/8 with more in it. That should put you at factory 80's H/O or 442 1/4 mile times just improving your 60 ft. It just should be faster, kind of like the 403 I had in my car.