Ok, here's my setup.

Crate 2004 LS6, 1998 LS1 intake (injectors & throttle body), 2002 f-body exhaust manifolds, mandrel bent y-pipe to single 3" (magnaflow), high flow cat (magnaflow), stock 4l60e with transgo HD2 shift kit, 3.23 gears, Yoko AS430 tires 245/50/16, 1" lowered summit springs, gabriel shocks all around, spohn sfc, control arms & panhard bar.

The car idles fantastic. I am getting 18.5mpg in the city. It has NOT been tuned. My problem is that I can not break the tires loose. When you launch it simply squats and goes. Granted it sets you back in the seat and pulls like a champ but I fully expected to burn the tires off. My friends expected me to be able to burn the tires off.

What would you expect it to do?

Lets not debate the choice of parts and exhaust. I followed the factory tunnel because I cannot lose ANY ground clearance. My driveway is such that if I lost ANY ground clearance I simple could not own the car. And as far as the intake, I got it for free and during this build money was getting scarce.

I have an LS6 intake, ported tb, injectors and vigilante converter on the way. Once the intake and tb get here I will have it tuned.

 

I know LS1's are known for having their power up top in the RPM's, but you should still be able to light the tires. My bone stock bad running LB9 305 could lay a huge patch.

 

lsx motor do like to rev, so it might just not be revving enough to break the tires loose, but it sounds like he upgraded the suspension too so he might just be hooking up well enough to not smoke the tires. maybe thats not as glamorous, but it means that the power is going to the PAVEMENT not to killing tires. it might be a good thing to not roast the tires as long as the power is there from the motor. any idea about track times or acceleration? a gtech or similar accelerometer might be very helpful if a track isn't available.

 

Sounds a bit strange... But you've got some mismatched parts. So it could be enough to throw things off. What MAF sensor are you running? Stock LS1? Im not going to "debate" exhaust, that sounds fine. I just dont know about the whole LS6 with LS1 intake. Usually goes the otherway around for more performance. Ive only dealt with the FAST 90 though, so I dont know what all those stock intakes have different.

Ide get an LS6 intake, correct injectors, make sure everything is in line, then get it tuned. If you cant break the tires loose then....THEN Ide say something is wrong.

Ive driven poorly running LS1 cars and they were able to atleast bark em pretty good off the line.

What about your trans? Everything working ok there? Not slipping at lower rpm?

J.

 

Well, not having it tuned could be a pretty big deal - you didn't say what kind of ECM/program you're running, so that could conceivably account for 40 hp or more... Have you run a compression test, just to confirm that the lower end is sound? Figure that the stock exhaust manifolds could account for another 15 or 20 hp (vs. a set of long-tubes) - although for manifolds, I'm sure you're aware that the stock f-body units are pretty darn good.

Also - have you pulled any codes? Do you know if it's setting any DTCs? That would be worth checking as well.

The last thing I'm thinking is that techrunner might have a good point as well - all of those suspension pieces might be helping to plant the tires also.

If you can provide a bit more info, I'll bet we can narrow it down fairly quickly.

 

when we testdrove a brand new 35th annv. ss (auto) it wouldn't burn the tires, just squated and took off like a bat out of hell...

...not even a chirp, just tore down the road.

 

hey V8, that TA looks like it could use some more rear gear!

 

I have not been to the track yet. I will get dyno'd tomorrow if things go well.

I am using an 85mm MAF I believe. The dual unit.
I am know the LS1 intake on LS6 is definitely holding something back.
The transmission seems to be solid though the 2-3 shift is long. I gotta check the computer to see how thats set up and check pressures.
The ECM is out of a 2002 Tahoe that was "configured" for my equipment (maf, injectors, etc) but unsure what kind of maps are in it.
Compression test is perfect, leak-down test is perfect.
I have not checked for any codes. The check engine light is not on but I'll double check codes this weekend.

Thanks for the help!

 

marylandspeed.com has a great deal on a 78mm fast intake, 730$. thats if you wanna keep the ported tb you have.

...decent budget setup i think.

...but in general an ls6 intake is worth 10-15rwhp with a set of 853s or 241s. may be worth a lil more on your 243's...

 

I got it dyno'd today and it made 280hp/290ft and the A/F was in the 10's. So LS6 intake, ported TB and tuning should get me 30-40hp which still leaves me far short of my goal. I bet it still wont light the tires.

 

3.23:1 is plenty of gear to kill the tires. My fourth gen Z28 would make all the smoke I ever wanted with just a 2.73:1 gear once I installed the B&M TorkMaster 2400 torque converter. But switch to a stock converter and a 3.42:1, and no more traction problems.

 

try power braking it..oh and even if your done 3o or 40 h.p. you still have plenty of power to light those tires on fire..if none of the above..something is wrong..plus that transgo shift kit..does it really hit when you shift gears..or is it just a nice smooth shift..maybe something might be wrong there..goodluck

 

I have a line lock, so I can light the tires that way but I meant from a launch.
The shift kit does hit hard and squaks the 1-2 shift. The 2-3 shift is like butter so I am looking into that but could just be the computer.

 

LS6 engines generally dyno in the 350+rwhp range stock... You definately need the LS6 intake or a FAST intake. A tune is definately in store for you as well.

What stall converter are you running?? Ive owned 2 LS1/4L60E Fbody's and both lit the tires when they were bone stock. My T56/LS1 Camaro SS LE will tear them off too.. Sounds like your're either hooking really good, or your setup is way off. You need to get it hooked up to HP Tuners and get it checked out

 

Traction control?? Ive been in a bone stock ss and it would blow the tires off if you really got on it from a dead stop. If it didnt smoke them, they were screaming mercy.

I agree you are missing some power, and you are running pretty rich too if its 10 across the board. But...as others have said, you might just be hooking up that good. I wouldnt worry or panic yet. If the motor is mechanically sound, just gather up some parts to match things up better, and get her tuned. The tuner should be able to look at things and find if anything isnt jiving...i.e. injectors, maf, etc.

I think even just a tune alone right now would make a difference for ya...but once you get settled on parts, I think you'll be surprised how much better it runs. All it takes is one of the peripherals to tell the PCM some wrong info and it'll send everything out of whack...but the PCM will keep it in check enough to run good. Just not 100%.

You'll be ok!

J.

 

Thanks for the encouragement. Looking at the graph the HP and ft-lbs are pretty low from the start. I hope to get ahold of HPtuners this week and work with the maps.

I believe we have decided to do a cam and head. My wife wants us in the 10's so no matter where tuning gets us we know we need more. Currently looking at a Torquer v2 and trying to decide on heads. Wish I had done it while the engine was on the stand!