Need New Turbos... Help me Decide!
 

So after knowing that my T3/T4 57mm turbos are dying, I decided to get new turbos. I have the HP Performance Twin Turbo kit and a 402 LS2 that I'm temporarily using. I'm planning to get a new motor later but in the mean time I will be using this motor to get everything up and running. I think I will be stuck with those 2.5" downpipes since I haven't seen anybody offering 3" downpipes on the HP Performance kit.

I have a goal of 1200 RWHP as a minimum and that should be with 91 pump gas, straight meth and race gas.

How would you think I can reach up to my goal easily?

2.5" downpipes, 91 oct and 1200 whp?....

Not going to happen. I made 1250 @20PSI and 1437 on ~28PSI and that is with twin 76mm.

Impossible?

I'm already pushing 746 RWHP on this 402 with 91 pump gas and meth on those 57mm turbos and ~11* of timing.. I think 1200 is doable with the right turbos and right motor, don't you think?

Come on Nick. What if I get 76's? I'm seriously thinking about them after looking at Bam Bam :thumbs:

Yeah gotta make 3" dp. I gotta be honest I've never driven car in kill mode. Last outing at Etown was a waste..track would even hold off gates. I understand that not every track event won't be ideal especially when its just a little ole rental. For that Etown event id rather have a h/c and get more seat time/practice. Going into my build it was based around killer highway ride. When you build keep your goals in mind.

Not on 91 unless the motor is huge.

Obviously with an entirely different setup you can make your goal lol. Not with what you're working with.

I made 1073rwhp @ 18psi with twin 62mm

If you are looking for something that is a step up and a direct bolt on, what about a pair of Turbonetics t3/t4s with the 60-1 compressor and the F1-62 turbine? Or a Comp CT3 series like a 6262 or 6765? Let me know, would love to get you set-up!

Now you are talking Faisal! 1200rwhp will be nice :D
prepare a new motor, clutch, fuel system, etc

How about you stay at 1000rwhp and let us have a close race lol
good luck buddy

With our crappy fuel and Weather 1200rwhp Is not going to happen But 1000-1050 is possible with the right turbos + engine 16-18psi
For 1200rwhp on 91+meth it must be 427+ci with 76+ turbos 18-20psi and IMO the car will be a ticking bomb with our fuel..

Well said :thumbs:

LOL and change the car while I'm at it :p

Awesome numbers man! Sounds very fun to drive :rock:

Thanks !

Of course a 900whp GTR will be faster than any Vette
:D

Moe, I will race you now with no turbos :D

Deal?

Sam baby you can't imagine how meth is improving the fuel. It is really fun to have and gives a lot of room to play when tuning the car.

Watch me hit that 1200 on your dyno with our crappy fuel :rock:

Ha Ha

I swear I wish to see your black Beast making 1400rwhp on pump + meth :D and I know how much Meth can help with tune I've seen it on lots of cars but you're talking 1200rwhp !!!
LMR made thise numbers on 18psi 440ci and Billet 82mm turbos and 93 octane not our 88octane :lol: :lol:
I hope with my new GT55-94 single turbo I can 1400rwhp on kill mode
And 900rwhp on 13-14psi straight pump gas :hide:

Maybe the question is 4-bolt or 6-bolt heads?

What's the most you guys have made on 4-bolters? Where does he need to ensure the heads are 6-bolt?

I'm really happy to hear that the yellow Sleeper is waking up soon :rock:

Will be looking forward to smoke the $hit out of you :D

I think I will really see that with my current motor :D

It's there for the experimental purposes. I'm planning to upgrade to a 6-bolter after I'm done with this one.

LOL, yes I would race you Faisal, you without turbo and me without engine lol

Sam, Who spoken about GTRs? these cars are scary fast especially in our silky streets in Riyadh! but your MC performance zr1 with nos done the job prettly well for the 900whp GT-R :D

We had yesterday Chris from AMS locally here in Saudi Arabia tuning some Evos and GTRs :) I had a small interview with him as he tune American's cars as well

this kit is great just the T3 flange is a HUGE hold back. no matter how big of a turbo you put in the T# it just wont be able to move enough exhuast gas to stop form huge back pressure.

i think the t4 flange with a 3" vband and fit the biggest DP you can.

this is the issue with these turbos. the T3. :(

the 6766 would be a great upgrade with a t4 flange. but if going to go to the t4 flange i think the 7275 would be a much better choice for his 1200 Min wheel horse power. the 7275 will give him room to grow.

plus if you go with the bigger motor ;) then it will be a rocket.

Haha that's awesome. Maybe you can set the 4-bolt record. I'm sure it's around there. :cheers:

Man thanks for the great feedback and now I'm talking to a couple of shops to do the T4 flange and the 3" DP.

But since I'm doing all of this, why not go with the 7675 instead? I just can't take it of my head.

Only time will tell my friend :D

we can do that turbo also. just think the 7275 would be a fun little street rocket. spool qucik. make great power.

but in the end it is your car, your build.

i wish i was closer. i would do that t4 and 3" down pipe. for you. lol

Thats a :funnypost: I'll make sure I have my :pistols: and you better bring the :steering: Mod

:rock:




So any numbers we should know from the GTRs that Chris tuned? :hide:
We just finished tuning 1072whp GTR R35 this car ran 9.3@153mph with only 950whp The car will be sick on the street :thumbs:

I'm talking to the ZR1's owner for Stage 3 build :woohoo:




I'm sure we can help him with T4 & 3' DP swap :thumbs:
I also agree with 7275 turbos 427-440ci engine Faisal's goal may be close.

7675 turbos are sick but it will be perfect for 454+ci Tall Deck if he can fit it :eek:

Now you're talking baby:rock:

Just pick up the damn phone!!

Faisal, i will get you info before the day is over. just super sumped at work.

1400 hp on piss water fuel + meth......lol ok. Real fuel>Meth bandaid.

As for the 4 bolt head thing, I've seen way more power than that on a set of four bolt heads. So that shouldn't be an issue if your tuner has any ability.

As for turbos..let me get this straight you are wanting to run twin 76's for only 1400hp?

Ok, you seem to know a lot and you can help me. So fuel is 91 + Meth. 4 Bolt Heads on an LS2 402 (for the time being, will go bigger later). Yes, let's shoot for only 1400 RWHP.

Help me "properly size" my turbos :)

76s do seem high. Maybe 67s would be a better fit.

You also don't want that curve to look like a ski jump. Power under the curve is more fun.

I recommend 7275.

And you would mount these where exactly? :toetap:

In the fenders if he uses the kit he has.

yep. doing some size checking but that is where they will go.

to do a little updating. the current turbos the customer had where about the same size as 7275 turbos. so the fit will be pretty easy.

and should rock with the 7675 pair he bought.

Pure meth scares me. Especially for a street car. Too easy to start a fire if ever in a rear collision.

Gasoline is much more flamable and dangerous than methanol.

I'm aware of this. However depending on where the tank is mounted it usually is a lot cheaper quality and would be easy to puncture and be a potential fire hazard. Then again I'd personally just run e85 or e98 for big power. I've done meth injection (in turbo imports) just not my style. I'd rather build and tune on some sort of ethanol for big power.

Can't believe you really talked him into twin 76's....this forum never ceases to amaze me.

Between customer, PTE, his shop and myself we came to this being the best choice

:D

You never cease to amaze me with your posts man!

Just sit and watch.

If he's looking for 1500rwhp on mid boost with the new engine then why the hell not !!!

Because they are good for 2800+hp....if you have an efficient engine you could make the power he's looking for on one of those turbos and have a powerband that isn't terrible.

LOLok chief

are you buddies with trinic5???

blah hah hah..

love your avatar...cool neon green wheels!

awesome having you here to educate us on FI products/knowledge.

didn't get what u drive? what u driving sporty?

Bring on the personal attacks....pretty common response for someone who doesn't understand something. I'm not here to "school" you on FI products or knowledge. You can listen to the things I say or not it doesn't matter, but instead of shooting things down with no insight given why don't you help the rest of us.

Get em Nick !! I love his Hp #s as much as a love the wheels. Some people amaze me with their so called FI knowledge .:thumbs:

love this statement..

"pretty common response for someone who doesn't understand something. I'm not here to "school" you on FI"

yeah your right i guess.........I have NOT received many compliments on my ultra clean top mount setup that i built and designed.

besides your neon spray bombed rims whats else you got lurking under that hood? neon light kit? let me guess the color is...................................... ............................

GREEN





yeah tim take off your current turbos and hang a set of 76mm and see if still go ~190mph in 660 feet :lol:
cause based on his wealth of turbo knowledge 2800hp should get you fairly close.

That 1400 number u talk about. Yeah those turbos will do that. But it would have to push the 30 psi range. That's alot of internal pressure for a v8. Now I think using bigger turbos with smaller a/r to help spool is the best route. U don't need 30 psi to reach goal. Just hit 18-20. A lot less wear and tear on ****.

I'm really enjoying reading this thread! LOL

Atomicfusion doesn't go 190 to the 1/8 with over 3000 hp. I'm not denying the fact that those turbos would be working hard to make 2800hp in my extreme example but it is possible and I guess if you're scared of boost for whatever reason you couldn't get it done.

Serious question how does boost pressure have anything to do with wear and tear? Instead of just bashing people how about we do something constructive and have some good thought provoking conversation for people who don't have as much experience.

To me it looks like way to big turbo for the application but I´m no expert. I would think you would lose low end TQ.

Well whoever likes the idea or doesn't, I moved on with it :)

I figured, experience is much better than science... Especially when science comes from inexperienced scientists :D

Progress is here :D

OMG!! the more you type the more ignorant you sound. so what ur
above means compressor maps mean nothing:lol:
OK
first whoever said Atomicfusion? I said "Tim"
go back and look at the post from 8secltal.
Do you know who that is? He has one of the fastest turbo cars in the country. I suprised you dont know that as ive read your posts and your quick to the "mr know-it-all" whenever turbos are recommended.

Yes and I was using atomicfusion as a reference point since it's pretty safe to say it's common ground and it's well documented...We can talk about compressor maps all you want, but that's just theory and after all your comments about experience and your complete lack of response to any intelligent question I've asked, I figured you'd want to stay away from that.

totally depends on the header design, hang those turbos on the rear bumper vrs nice and lose to the cylinder head and it will be night and day.
my 76s with quality header design and inconel heat sheilds spool fast with M6. my one primary can be partially seen under inconel and after spirited drive the header is glowing orange. think all that heat helps spool? dam straight.

At least we can agree on something :cool: The pressure differential caused by a difference in heat is what really helps spool turbos. You can combat that by choking the turbo with a smaller turbine housing or a smaller turbine exducer but you are also sacrificing max power by limiting the exhaust side.

Yeah you can but I've seen toasted exhaust valves from to much back pressure. Yeah you can do it but it just does t last long. My 76 twin spool really fast...faster then what I was expecting.

my vote goes for 2 67/66 billet pte turbos for your goal, this is what i had on the supra (1) and i loved it

he bought PTE7675B

http://forums.corvetteforum.com/c6-f...s-of-pics.html

you ahve a great size the 6766. but with the t3 flange it is very limited. but he wanted to switch to t4 and go BIG.

The 6766 is available with t4 flanges open up to .96 and divided to 1.32 I think.

Yes u can get the 6766 in t4. But way not go big??

Go big or go home. Lol.

:rofl: