chevyrunner

iTrader: (4)

took my car to the track last night and it ran like crap...

it completely bogs out of the hole. when it finally gets going it hauls *** but it takes way too long...

i have a 237/242 603/609 cam and cnc heads with a 3600 stall 373 gears.. last night it ran 7.9 with a 1.9 60 foot and a 91 mph....

it ran the exact same speed and time with a horrible tune on it and with NO HEADS. it had the exact same stall. after putting the heads on the numbers on the dyno went up drastically but the track time does not reflect. before the heads the car launched extremely hard out of the hole and then died out on the top end. now with the heads it has huge top end and no ou8t of the hole power. Im not saying its the heads im just giving a reference . the car was tuned by CMS so its no like anybody just tuned it...

when i drove it last night i manually shifted the car. the 7.8 was my best time, i tried to race it in regular drive and the car bogged even worse out of the hole and ran a 8.1 at 88 mph, it also dropped rpms way to low on each shift as it went through all of the gears. id say it dropped the rpms about 1k too low on every shift while it was in drive. it seemed like it lost more and more power on each shift.

the car can only hold the tires to about 2k before they start to roll. i tried stalling it as high as i could and i also tried flashing the stall to only about 12-1500 rpms and the same result everytime.. no power out of the hole

id say its a stall problem but i had this same stall before the heads and it launched hard as ever out of the hole... is this a possible stall problem a tune problem or some sort of other problem... im running a stock intake and throttle body is the motor not getting enough air at low rpms?

acceleration on the freeway at speed when going WOT is still sub par.

any help is appreciated...

Old Geezer

iTrader: (3)

Sprag in the converter rolled over?
A 3600 stall that hits 2K B4 it pulls thru the brakes?
A. The brakes are a ?
B. The converter has STB.
C. The cam heads combo has moved the HP/TQ curve above the stall curve?

Data log the leave and see what shows.

LS1MCSS

iTrader: (18)

I'm with Geezer on this one. Your car should not be pulling through the stall at 2K. Something isn't right with the stall o rthe brakes. I would guess it's the stall. What brand is it?

chevyrunner

iTrader: (4)

its a billet stall, the brakes are stock. the flash test shows the stall goes to about 3400 before the trans engages..

MM98

iTrader: (13)

That cam is not gonna start pulling hard until the 4-4.5k range.. Would look into getting the converter re-stalled, stock intake & tb aren't helping either.

chevyrunner

iTrader: (4)

I TALKED TO THE TRANS SHOP TODAY AND THEY SAID THEY that the stall they put in the trans is too "tight" and that they will swap it out and put a bigger looser stall... any thoughts... does this seem like this could be the issue??

1BAD98LS1

iTrader: (33)

Yeah I would definitely go 4400+ , something that will hit much harder out the hole

IT_SS

iTrader: (5)

Yea bro, this seem correct. You really want a stall that mates up with your cam. If your cam wakes up at 4000, you want a stall in that range for example. It'll also help with your WOT pulls on the free way

IT_SS

iTrader: (5)

Also did you talk to the tuner? With a 4l60e you really want the computer to do the work

FEAR LS

iTrader: (8)

This is another good point. It seems like your on the right track with upgrading the stall, but I would also see what Ryne has to say.