s-zero

Hey guys,

Looking to put together a project car to run at the local track. Will also be a street car. Just fun lapping sessions of 20min-1hr with cooling time. Few questions about what will work and what wont. Hoping to make ~500whp on wastegate spring and hopefully ~700whp on high boost passing with 350cc/min meth injection. Here is what i am using and supporting mods:

complete lq4 6.0L with Alum heads and stock computer
twin t67 journal bearing turbos
twin 38mm tial wastegates
3.5" exhaust with a convertor (cant stand the stench without)
4" intercooler with 3" outlets
ls6 intake
ID1000 injectors
arp head bolts
23x/23x 580ish lift cam
650 lift beehive springs
timing chain upgrade
engine oil cooler
upgraded 2 plate clutch
stock boost setting of 7psi
Meth injection on higher boost setting (12-15psi)

Is the stock ecm as good as an ls1 ecm? What tuning package do you guys think, hptuners? Only planning on revving to 6k but needs to be able to hit 7k very ocassionally.
Will be using race slicks and setup chassis so traction will not be an issue.
Hoping to keep to the minimum parts and $. Any must have's, suggestions or opinions would be appreciated.

Thanks guys

got-a-ls1

iTrader: (12)

twin 67's is way overkill for 500rwhp and even the occasional 700 i would say.. a single turbo like a pt7675 would likely spool faster then twin 67's on a 6.0 and meet your goals in a better overall performance package then twins. only problem i see with the pt7675 turbo is it may not make power to 7k rpm where the twins probably will. the pt7675 would be what id use for sure on a road course where spool time is very important.

s-zero

already have the 67's so might as well use them. may end up making a more powerful setup if the chassis can handle the power and engine can handle it. Will possibly build an engine at a later time if the car seems pretty fun to drive.
Anyone know if a stock engine will hold up for long with track duty if it has a good tune? Should i be using less aggressive cams than what i have listed? Will be at WOT 85% of the time for 20-40min at a time.

subarubill96

iTrader: (9)

what kind of car is this going into?
If your doing what i think your doing, you might want to look at a A2W setup instead of an A2A to combat heat soak issues.
Id also probably ditch the meth idea if your using it as your primary way of cooling the charge at high boost since you will probably run out unless you have a huge tank its going in. Also some racing groups wont let you run meth, i know in auto-x stuff it is very frowned upon.

s-zero

going into a 3rd gen rx-7 with widebody. weight bias will be about 55/45 f/r. Only using meth for maybe 30 seconds every other lap (3-5 minutes). 20L tank of meth usually lasts me the whole lapping day (8hrs worth or 3hours of drive time with a high boost hit now and again). Just fun lapping anyways and can top up tank after lunch on full day lapping sessions. Anyone know if this engine will hold out at that power? Intake air temps on my other turbo car get close to 170F, too hot for this stock engine at 500whp running rich and low timing?

runsfromdacops

For what u want the t67 is way to big. They will work but its not going to be vary fun to drive. Id do twin 57 trims. Or twin billit pt 5858s

tripblackls1

iTrader: (11)

I would ditch the twins altogether, just adds more heat to the engine bay and more things to break or fail

runsfromdacops

And stay will with a a2a intercooler. A2w will heat soak badly in a lap or two

gnx7

iTrader: (28)

If you put in an aluminum LS1 making about 400rwhp you will be light years ahead with lower lap times and avoid cooling frustrations than what you are attempting. Hell just run the LQ4 with a healthy cam/headers/tune and be done with it.

My road race FD is 47%/53% weight distribution. With a conservative dyno chart of 530rwhp/510rwtq I can spin the 335/30/18 slicks out back at just about any speed in 2nd if I mash it when the tires are hot. This is with 3.27 gears out back....

For a drag setup... it would work. For a road race environment you are going to be fighting overheating issues pure and simple.

jbhotrod

Not to go off topic but dang gnx7 thats some bad rides you got there. Have you turned the boost up on the one with 378 LS3 T80? How much power has it laid down so far? Im sure its a very stout combo, and with a car that light good lord I bet its fun as hell on the street!

s-zero

Just meant to be a fun project. Not looking to be the fastest car around the track. Drove my friends LS1 powered E36 BMW with just under 500whp and thought it was pretty fun, just not fast enough (weighs around 3000lbs). Currently running a '91 nsx with a single T67 ~400whp and laps pretty quick (2900lbs). Another thought was to put it into a 1990 Nissan GTR and adapt it to the 4wd drivetrain. Would have to turn it into rhd since i cant stand lhd. Been looking into that for the last few months as well and that might be a viable option for more traction.
I think the 6L even with the turbo's on there would still be lots of torque out of boost so not overly concerned about tip in response.
Thought about just buying a 2000 Trans Am but cant figure out how to get the weight down lower than 3200lbs easily so that's why i'm going this route. The import chassis seem to drive nicer on track and weigh a lot less stripped out. Will have to fork out some $ on a good radiator setup i know.