I have never been a fan of cometic head gaskets. Where I have seen those fail locally, LS9s have been used and never had an issue.

If your class is limited to a 76, then put the largest one you can on there. If you are not wanting to rework the kit, get the precision or new turbonetics 7675.

 

Ok.. ill check those turbos out. I'm limited to 76mm and base weight is 3200lbs I weigh between3210-3220lbs so its not a light weight ride.

 

It won't help. All of your exhaust still has to go through the tiny 65mm (I think it's 65) exducer. I would do whatever you need to do to get a t6 on there if you're serious about thus class.

 

The issue I have doing a t6 setup is clearance. its so tight right now as is. I know performance wise its smarter. I just gotta find a happy medium I can work with. Last yr I was the only turbo car in the class. I won 2 races. but I would like to be more of a threat next yr. and I know my setup is capable of a lot more.

 

What car is this in? Keeping accessories? Street car? BW has 92mm turbine t4's but they're still big.

 

Even if one of those won't fit, a 7675 would still make a TON more power, well over 100.

 

Its in my Nissan 240sx... what do you guys think about the tc 76 turbo from turbonetics?

 

never heard goodluck with the cometics. LS9s are the way to go. Also check your tq wrench and make sure its true.

 

Turbine is still too small. 7675 isn't that much larger but has a 7mm larger turbine than a TC.

 

I seen that after I started reading the spec sheet.

 

The 76/75 is pretty much the same size as what you currently have (physical dimensions), but IMO the turbine still undersized for your 5.7l.

Pros about it, you shouldnt have to modify your turbo setup at all to run it.
It will get you the half second you are searching for but not much more.

Con you are still going to run into a wall with it and want more.

I would seriously try to figure out how to fit a T6 unit in there with at least a 4" downpipe if you are serious about being a contender in that class, cut/notch the frame or whatever is necessary to make it work, you will be rewarded with one of fastest cars in that class in the area if the car can put the power to the ground. The 96mm turbine on the BW units is where you want to be with a 5.7 liter.

 

I agree 100%.

 

Ya I know what you mean... I've already cut/notched the frame to clear what I have. maybe I can find something to use as a mock up... ill do some figuring and see if I can't tuck it. I've got the fastest stock suspension/rear end etc 240 around this area. they already scared when I show up lol... but you have def got me thinking different on the setup.

 

I was in your shoes about a year ago, Martin @ tick performance gave me a wake up call on turbine sizing and that's when I switched to the S480 I was worried about spooling/fitment ect but I made it work and you wouldn't believe the difference especially in power high up in the RPM band. My goal was to run some of the 6.0 index racing down here then put it on kill mode and do some grudging but most people dont want none of a boosted LS anything out here. I can run the 6.0 on a measly 12psi and my car is a full weight, full interior, iron block, with 8 point roll bar, with good coil overs, and torque arm and adj pan hard bar and lower control arms. never had it on the scales but I am sure its close to 3600-3700 lbs as the only weight reduction its got is the AC delete and the turbo stuff weighs more than that.

If you run a LS6 or better intake you wont believe how strong it runs between the 6K and 7K range my car pulls all the way up to 7K no problem used to lay over just past 6200 and my cam is smaller than yours, I footbrake my car to 3500 and leave on about 12psi and its an absolute animal up to 7K. On the street it starts to spool around 2500 and will be full tilt before 4K and its on from there. Your motor is about the same size as mine, if you can run E-85, it expands more allowing you to spool a larger turbo earlier and its cheap. A good converter will go a long way to. I am sure you've heard that before I am also sure the nay sayers say it will have a supra power band obviously they didnt do it right or there buddy they rode with wasnt right. With a big turbo car the converter is most important part besides the turbo I had to pull mine and have it adjusted 3 times before I was satisfied with it. After that you just got to put the power to the ground.

Bottom line is I am a fan of the S476 with the race cover and billet wheel Ive seen theses turbos break 1000 rwhp on LS motors without breaking a sweat. And there are plenty of guys running the 1/8th down here that are deep in the 5's with them and are about your weight some are into the 4's only there stuff is top secret because they grudge to.

 

I'm actually carb / blow thru... so my intake should flow little better. have any of you tried any of the holset turbos?

 

Nope, not sure if I have ever heard of it either in the 76mm class.

 

Ran quite a few Holsets.....

Including an HT60 which is a 76mm unit.

No way on earth id try and race competitively with one.

Guys have gone 5.20's with the 850 dollar S475 w the race cover...

Its the best fit for you.... go S476 even if you want to.

 

Edit:
Who sells the s475 with race cover for $850

 

Forgive me... i made a mistake and confused the T4 housing "upgrade" price with the race cover price....

Im half *** dyslexic... 389 not 200 extra on the cover per Jose's website.

 

Haha thanks man for clearing that up. Is the race cover worth the money? For a small street driven 4.8.
I hope the op doesn't mind my question, its the last one bud