Hey guys,
Why did my car run slower with the new exhaust and y-pipe than it did stock? Can humidity really make that much of a difference (70% vs 100%). Also, why is my et 13.3 when my trap speed is 108?

 

Whats your 60' time? I trapped 14.2 @ 104 with a horrible 2.5 60'.

 

humidity can bog ya down a little. but there are so many other things that could play into it, 60ft etc...

 

Best time:

Temperature: 80 F
Humidity 71
Barometer: 29.36
R/T: .038
60': 2.018
330': 5.763
1/8 Time: 8.718
1/8 MPH: 83.5
990': 11.160
1/4 Time: 13.346
1/4 MPH: 107.16
Mods: CAI, Air lid, K&N, MAF, smooth bellows, shifter

Time after exhaust and y-pipe:

Temperature: 67 F
Humidity 100
Barometer: 31.25
R/T: .072
60': 2.162
330': 5.879
1/8 Time: 8.830
1/8 MPH: 83.22
990': 11.286
1/4 Time: 13.487
1/4 MPH: 106.38
Mods: CAI, Air lid, K&N, MAF, smooth bellows, shifter, cat-back, y-pipe


theres my times...any help, anyone...also, after i put my exhaust in, it felt like i got a bit of valve float after my exhaust too...
thanks all

 

Well after the mods your 60' time got worse which makes up for the 2-3 tenths that you didn't run. Did you miss shifts? Delayed shifts? Bog?

 

no, i felt a little valve float in 1st, but nothing that bad.

 

The 60 foot as said is a good 2 tenths ya dropped, add that in with the conditions and you ate up your gain. Was the temp hotter or cooler?

 

That 100% humidity killed you, along with the 2.1 60' time. Get your 60's below 2.0 and you'll be in good shape.

Boxed LCA's w/ poly bushings helped me a lot. Dropped .2 off my 60's and pushed me into the 12's.

 

any advice on how to get the 60' down? all opinions welcome...SLP race day this saturday...

 

The humidity may have been higher, but that was EASILY offset by the reduction in temperature (80->67degF) and increase in barometer (29.36->31.25"Hg) on the "after exhaust and Y-pipe" run.

The 60-ft time cost him about .24-seconds. I'd be more concerned with the MPH, which shows a bit of a loss in HP.

I'm not familiar with the SLP Y-pipe and "custom Dual/Dual exhaust" - is that going to provide the same performance increase as something like the Borla adjustable, or one of the more agressive cat-backs?