flintwrench69

iTrader: (11)

Finally got back to the track today to get some runs in. The last time I went to the track, I ran consistent 12.8s @ 110, 1.9 60s with these mods: LTs, LS6 intake, SLP lid, DRs, 3.73s & UMI tunnel brace mounted TA. Since then I installed a TSP 228 cam, 114 LSA .588 lift int. & exh., & had the car dynotuned. I was expecting to run somewhere in the low 12s but mostly ran 12.6s with a best 12.55 @ 111 mph w/ a 1.8 60 time. Temperature was 75-80 deg, Density altitude was 2107 ft. It was much warmer than last time so that may be a factor, but something just doesnt seem right. Looking at my times, I am only picking up 20 mph in the back half(1/8 mile) I was only picking up 20 mph with the stock cam too. I remember someone saying a stock cam car should pick up somewhere between 22-24 mph there. The car was hooking pretty good, just seems like my traps shouldve been much higher too. The car feels like it pulls pretty hard, not sure what could be wrong other than maybe the cam needs to be degreed. I had real low cylinder leakdown when I changed valvesprings, under 5% on each cylinder. My car was #217.

99SSAGUI

iTrader: (7)

tune maybe?

BayAreaSS

iTrader: (10)

Yea your car is falling on its face on the back half. You should be trapping around 116 according to your 1/8 mph.

flintwrench69

iTrader: (11)

Yea, thats what it looks like. Maybe that Borla muffler is restricted. I say that because before I did the cam, my back half gain was still low compared to what some others have said it should be. It doesnt feel restricted though.
I am thinking a cutout would eliminate that theory. Then again it could still be the cam needs degreed too. I didnt pick up much really in the front half either, just .2 & 1 mph. Thats with 1.8 60s instead of 1.9s

Just had a tune done. My first baseline run with 2 deg timing added was 349 hp. When done, I was puttin down 378-9 hp with a 380 pull.

DSkyles

iTrader: (1)

My 3.73 auto car with just exhaust and a tune goes 12.60's traps like 111......

nocooler

iTrader: (5)

No way a cam'd car should run under 115mph.

My bolt on car has you covered by 2mph in the same crappy D/A. It picks up 25mph thru the back end.

Either the tune sucks or your valve train isn't set up right.

Blk_Ws6

iTrader: (4)

These are some pretty good numbers how much different you think you would've done with 3.42's?

01ws666

+1 My friends cammed bolt-on t/a traps 91-92mph in the 1/8 = 116-119 in the 1/4 thats a 25-27mph gain on the back half.

My t/a on the other hand with bolt-ons and stock cam traps 86-87 in the 1/8th and 110 in the 1/4 thats a 23-24 mph gain on the back half .

BlueGoat06

Change the tuner and the car will pick the rest, you're not the first one with the same experience, from the same shop.

flintwrench69

iTrader: (11)

Hmm really?

BayAreaSS

iTrader: (10)

I did 91.x in the 1/8th and trapped 116.x in the 1/4. Either something is up with your valvetrain or the tune is off

flintwrench69

iTrader: (11)

Well before I go blaming the tune, I will tear it back down & degree the cam.