z28adiction

iTrader: (1)

Having a twin kit built. Before I call presicion and turbonetics I figured I'd ask for real life experience.im Not sure what turbos to buy. Engine currently will be a forged 346. As of now I won't be using this engine for max effort setup. Looking to keep it at 750 wheel or so. The kit I'm having built is for a max effort 6 bolt engine that ill be installing on my forged lsWhile i save and parts hord for the 6 bolt engine. Looking for something with a billet wheel ball bearing would be cool but not necessary. I was looking at turbonetics gtk turbos that seem nice. Will be looking to make 1300 1500hp on 6 bolt engine. The problem is that I don't want to buy turbos for this engine and then have to upgrade later. I will have no problems sacrificing spool time on the smaller engine as stated before this engine is temporary but want to spool befor 4250 at least. The 6 bolt engine will not exceed 410cu inches. So with that in mind shoot me ideas. I'd like to keep cost around 3k. Original plan was to run billet 76/75 presicion turbos but I'm looking for a wide power band for mostly roll racing not a dyno hero.
Thx guys. Any other question that I haven't thought of just ask.

Rob Carlson

I have the nastiest kit you could buy. It will see 1300rwhp if needed and spoll nicely. If you're interested text me at 8608979983

LS1NOVA

iTrader: (12)

Turbonetics ball bearing 7575 with .81ar for around 1600 each. I have Turbonetics 6668's with .81ar on a 5.3 and really wish I would have went straight for the 76's.

Another option if you want killer spool but would be fine with them being tapped out at 1500 flywheel would be the Precision 6667 and .81 T4.

from9rto1k

iTrader: (2)

I got turbonetics 7268 was worried they would be too big

oscs

iTrader: (19)

Depends on your setup and HP goals. For some people that would be to big. I run twin 66/65's on my 370CI and could have probably gone smaller.

z28adiction

iTrader: (1)

I was thinking of going with the gtk850 turbos. Seem like they may be a bit big for the 346 but would be ok for the 400 cuin engine.

Rob I appreciate the offer but what I have in mind is pretty unique and finally found weld quality I like.

stevieturbo

roll racing to what speed/distance ?

manual/auto ?

And when you say spool....many turbos might start to spool below 4k, but do you mean ability to make say 5psi, or 35psi by that stage ?

Some will say the BW 366's will be enough for 1600hp, although that sounds like a hard push. Some of the upgraded billet wheeled versions sound like a better bet, plus they are good value.
I'd have concerns about Precision reliability with a small unit pushing them very hard on a biggish motor.

LS1NOVA

iTrader: (12)

Here is a vid from GTO mentioned above. 6765's on a 427.

Go BW billet 66 or PT6766 with .81ar if you want a killer hit.
Go PT or Turbonetics 7575 or 7675 if you want slightly less of hit but intense top end.


I dont know the speeds but prob 60-140.

Huron Speed

iTrader: (1)

I would be happy to help you out! shoot me an email at casey@huronspeed.com and lets talk. we offer turbos from precision, comp, turbonetics, bullseye, and forced inductions!

z28adiction

iTrader: (1)

Appreciate the help guys. The car will always remain a 6 speed. Roll racing prolly to 150 ish at times. by spool time I don't mind other cars jumping out a bit if I have the mid to top end to go by them. I just don't want 1500 rpm of a real nasty power band that's real peaky.
I've raced other cars in the past like this and they were there for a gear but after that they got housed bc the power was just not there in the midrange

That's y I was think the gtk 850 would be ideal. There a bit big at a 72/68 turbo I believe but being there ball bearing and billet wheel I may not notice the size in between shifts especially on the larger engine.

Ill shoot you an email Casey.

transam69230

iTrader: (49)

The turbine wheel is too small. I had back pressure issues and flamed my head (blew a head gasket) with twin 76/68 on a 427 6bolt. The GTKs are not worth the extra coin, but they look pretty. Turbonetics 75/75s, PT 76/75s or a BW unit is going to be the ticket.

z28adiction

iTrader: (1)

My original plan was going to be ball bearing 75/75s but thought they would be to big. With a stick. They were reasonably priced also. So what makes the better power tirbonetics new 75/75s or pt 76/75s. I've heard turbonetics customer service is the best out there and presicion can be a nightmare.

transam69230

iTrader: (49)

Yup I heard the same thing, and that is the exact reason why I choose Turbonetics. Turbonetics provides a 1yr hassle free warranty.

Precision is 12,000 miles (not sure how many months) but I heard they don't do well for for customer service.

oscs

iTrader: (19)

My vote goes to turbonetics. Their turbos come with a 1yr no questions asked warranty. If you do some searching you will find A lot of people who have had trouble with precision products.

98Camarod

iTrader: (43)

I had twin 6665's on my forged 347 and ran 9.80@141 on 10lbs of boost. I parted the car out and started my new build, so no high boost numbers.

FirebirdSS

iTrader: (7)

With doing over 200k of business with pte, I have warrantied 3 turbos.

z28adiction

iTrader: (1)

What is the new version of the turbonetics turbo that is meant to compete / out flow the pt 76/75 billet?

stevieturbo

If only racing to 150, you're going to need a hell of a setup to get the power to the ground.

I've nowhere near 1300hp and I can smoke the tyres with ease even at 140mph.

Probably somewhere around the 72/78 might work, but then the turbine might be a little small.

I went for a pair of 364FMW's which in theory should have potential for close to 1500-1600hp. Certainly in a higher gear like 3rd or 4th I can make 15psi by 4000rpm on a 382
A cam change over winter will likely improve that a little more.

IMO go for a smaller motor, slightly smaller turbos and just use more boost to make the power. If you choose turbos you can spool earlier, then it gives you far more control over power delivery via proper boost control, ramping in with speed, gear, rpm, whatever

If you choose larger turbos that exhibit slower spool, you've only a select few options to improve that at the low end even if it then improves at the top end.

codyvette

iTrader: (24)

Is that good or bad? How many grenaded that didn't get warrantied? I have no idea about this. I am just saying that statement could be taken more than one way.

ablakez28

iTrader: (9)

Glad you finally found that weld quality you like.