Thread: MPH in the back half

Looking for comparisons on set-ups.

What I'd like to know on set-up:

Motor L67/L36 (for compression)
Gear
Cam (installed straight up or degreed) or rocker ratio if stock cam
Timing chain (if stock L67 or L36)
power adder

On mine:
27.21mph
L67
2.93
Stock/1.91
Stock/L67
M90


This should be interesting!

Ill play.

19.23 MPH
L32
2.93
Stock/Stock
Stock/L32
G5 M90

Mods at the time were 3.5 pulley, DP, HAI. Also another factor to think about is tire choice as well. I ran slicks. My MPH was 98MPH with street tires and a horrid 60 foot. My MPH went down to 96 with slicks and cracked a 13.9 with a 1.97 60 foot.

I'm gathering info from several sites, and you are a little on the low side. Kind of interesting, since the '97 had a true 1.6 ratio, seems like the others with a similar set-up are picking up more MPH than you that have the later years.

Since the factory switched to a 1.66 ratio in '99, those pick up about 2mph over your set-up.

Do you know if the valvetain is all stock original for the '97 or the L32? The L32 should have the 1.66 ratio on them.

The guy I bought the car from said it was a complete 05 L32 drop in engine. I thought the back half was a bit low myself. I chalked that up to stock catback and the slicks. The 1/8 mile MPH was 77.51.

The catback on these cars are horrid. The mufflers drop to a 2' in and out IIRC. I know alot of people have told me a catback alone would probably help out quite a bit.

Originally Posted by Fish

The guy I bought the car from said it was a complete 05 L32 drop in engine. I thought the back half was a bit low myself. I chalked that up to stock catback and the slicks. The 1/8 mile MPH was 77.51.

The catback on these cars are horrid. The mufflers drop to a 2' in and out IIRC. I know alot of people have told me a catback alone would probably help out quite a bit.

You have headers? I didn't feel my cat back was all that bad until I was low 13's. Wonder if the res is plogged?

Originally Posted by SyntheticShield

Help me play here. MPH in the back half of what?

Between the 1/8 and 1/4 mile. Reveals a lot about top end HP, since it mostly removes traction from the equation. Take your 1/4mph and subtract the 1/8mph

They arent on the car yet. I have my old SLPs in the trunk. I wanna hit fair on Friday and get the flex fixed and get a catback. The Regals also have a singe out catback as well. No y pipe to help exhaust any bit.

The next track outting should be alot different.

Ron I already posted this on Clubgp, just wanted to share it with the members here...


24.2 mph
l67
3.29
S1X
RollMaster Double roller/straight up
M90/Gen V

OK, here goes.

22.44 MPH

L67
2.93
XP Cam
Double Roller
GenV w/ 3.2

Originally Posted by IndeedSS

so far Ron has the best 1/8 to 1/4 mph. Ron who has the best at the other spot you are checking? and there mods?

Best is 32 so far, but I'm looking for data that shows a trend. Mostly because of cam advance, and rocker changes.