SIC_C6

Bout to start buyin the goods and Fabbing a Twin Turbo set up for my LMB Z06. leaning towards going with two CompTurbo Ct43 7076 ball bearing oiless units. .96 AR. And a 430 inch ERL motor. Ballparking 1300-1500 hp. I was curious to see what other turbos the twin turbo guys have been going with? or single turbo guys for that matter.

C6 Curtis

Go with Precision 6266's Journal bearing billet compressor wheel. They go for $850 shipped each brand new. Fabbing your own kit is far cheaper then buying a whole plus you get everything you want lol.

-Curtis

SIC_C6

^ exactly.. wouldnt buy one of the 10k kits and have junk turbos

SIC_C6

also dont think the 6266's will make the power were looking to put down. though that is a god price. cheap isnt the basis of the plan

C6 Curtis

http://m.ls1tech.com/forums/showthread.php?t=1502343

^ 6266's should definately be what you're looking for

Z06-TT

alot of wrong already. hope this helps


6266's wont get to the goal. they might be really close with Ball Bearing AND 30+ psi there rated at 80 lbs a min @ 30PSI . so thats like 800 horse ea or 1600 total. and that is a flywheel number not a wheel number. i think for a little money more twin 6766's would easily get you there. Got a guy with our APS upgrades making 1436 on 6766's @ 25 psi on a 434ci

not all 10K kits have junk turbos. i know one for a fact one releasing with 6266B twins for the Z06 kit.

your correct they wont

We have a customer with a 454 run a pair for PTE-7675B turbos around that 1500 horse range. they have a smaller AR housing so they spool fast but also make great power.

MGJ07C6

I bought DKT's manifolds, downpipes and his Precision 67's. Vengeance Racing is doing the build. I have an RHS 440 with Mast 305's, mild solid roller built by ProLine Racing.

DKT is a member here.

newvetteguy9

I'm Suprised so many people here advocate for precision turbos..... Personally I wouldn't trust them on a Honda I've personally lost a vehicle to them and almost my life. I would never let any friends run them. I've seen way to many failures both on my stuff and shop cars along the way.

Z06-TT

the fast cars run PTE, does failers happen sure. fails happen when **** get pushed really hard.

ive delt with PTE for 3-4 years. i have warrentied out more Garret and turbonetics then PTE.

but newvette, to each there own.

C6 Curtis

Sry man but ive came from the Mitsu Evo community and ive seen single 6266's hit 800+whp plenty of times on a 2.0L. Also Ball Bearing has nothing to do with power output, it will help the turbo spool faster. Im sure a 6766 can meet his goal but it can also be done with a 6266.

Im sure they were using 6266's dosent matter if they used a T3 or T4 footprint its still a 6266.

-Curtis

Z06-TT

2.0 L and a 7.0 or a 7.2 L( he wants like a 430) are not the same. the exhuast gasses choke off the turbine wheel. due to back pressure. your talking about 1.5L more per turbo. thats ALOT of extra exhuast gas. your little 2.0 or 2.4L motors dont produce the exhuast gas of the big cubes


yeah i know the EVO world also. built a 900+ evo 8. and helped on the 3Dx evo build.

Z06-TT

yes the foot print is the same. but you can only get so much in and out.

you already goet exhuast gasses going in to the turbo. then you spin 20+ psi that means atleast 20+ psi was just added to your exhuast housing.

C6 Curtis

Of course i know a 2.0 and a 7.0 arent the same. A 6266 and a 6766 both flow the same on the exhaust side as they both have the same 66mm turbine wheel. 6766 and 6266 will both choke the motor the same way I know that for a fact. A T4 hot side will flow more then a T3 back side.

-Curtis

Z06-TT

no they wont choke the same.

a 6766 omves 11% MORE AIR per psi. so..... in my story above.

if you were pushing 20psi extra into the xhuast housing with a 6266 that would me like 14-15 on the 6766. so..... LESS back pressure.

yes t4's are nice. but cause more lag.

im not trying to argue the little things of basic turbos. Just form experence. you will really need to push those 6266's to get near his goal

C6 Curtis

I would really not like to argue but I cant help but to correct you.

6766 moves more air on the COLD SIDE ONLY as it has a 67mm Inducer compressor wheel and the 6266 has a 62mm compressor wheel.

The Exhaust/Turbine wheels are the same on both turbo's and so are the housings. You can take a 6266 and a 6766 and change the turbine housing with each other, the exhaust wheel is the exact same!

His goal can be reached with either set up. It will just be easier with the 6766.

-Curtis

Z06-TT

yes you are right the turbine wheels are hte same.

but on the compressor side the 67 moves more air per PSI. every psi you put in the motor is a psi that should come out. that is back pressure. BEST and perfect build is a 1:1. but over a 1:2 and you get problems that start.

so lets run a story.
twin 6266's on a 427 with a 1.06 AR and you make 1000 horse USING 20PSI. well thats also 20 psi in the exhuast housing.
twin 6766's on a 427 with a 1.06 and you make 1000 horse USING 15psi.. well thats also 15 psi in the exhaust housing.

now the more PSI you add the high the back pressure gets. till the turbo says no more and just stops making power. you can set your boost controler as high as you want but a turbo EXHAUST hosuing will reach a limit. this happens ALOt on big V8 builds that use T3 housings. you just cant keep craming air in. if that was the case people would very leave the T3.

so. back to what i said. i dont think the 6266 will do it. the housing will get to full of boosted air. to get 1500 wheel you will need like 35-40psi.

i thought the same way you did when i came over to the V8 world form the evo world. but the truth is the V8's make SO MUCH more exhasut gas to begin with that in the 25-35 psi range you just max out the turbine housing. this is also why people up the AR numbers.

for 1300-1500 in a 430CI twin 6766's on MY aps flanges or T4. or twin7275's on a smaller AR t4 housing will be his best beat

Z06-TT

to the OP. im sorry for ranting on you thread. just rather you buy the right turbo. then get pissed cuase you didnt get there trying to save a couple hundred.

SIC_C6

^ dont be sorry at all. been very informative. we have been looking at a few different turbos and the 6766 has been one of them for the exact reasons u have listed. we have also considered twin 71's. again the CT43 basis from Comp. Are you guys a vendor of PTE?

NICK YOSKIN

entertaining.
personally if you wanna make 1400 w/twins you will need 76s and big cube motor if you
want some what streetable setup. Smaller cubes solid roller hi rpm setup will do it but it will be snouty for the part throttle lower rpm cruises. then WTF do i know, could have my head up my as$ for all i know.

Dynos sheets with spikes are not accurate as Tim stated.

SinisterC6

I agree, Im looking to hit that number at the least with twin 7275 on a 440 solid with e85