gt3076r .63 vs .82 vs 1.06 a/r

[oldsking]

My turbo has a .68 hotside and a .70 compressor housing, turbo is a T66 and the guy I talked to said the same thing, it would have lots of back pressure, but wouldn't the wastegate help here? I was thinking looking into a .82 but i figured I build the motor and see how it runs first.

 

[Zazzn]

i have a gt3076r with .63 hot side on 1jz , it's a torque monster,but i want more top end power. I think .63 it's too small for top end power,i only does 13's and 114mph ,i'm really disappointed . If i'll try to change the hot side for .82 or 1.06 , do i waste my money and i'll be better to go with bigger turbo

other option is change for gt40r or gt35r ???a/r

There is a great thread on SF in the auto xing section regarding exactly this turbo and small turbos for response.

They talk about putting on the larger housings for more power but it's more of a band aid since it just moves the powerband further down the rpm range. I recommend more boost by adding a meth kit for some more power if you don't want to loose the low end. Otherwise a 35R is what you should be looking at since it's 61MM wheel will make more power, you'll loose some low end but be rewarded more then the 3076 top end.

40R will be a huge lag increase over what you have now and I doubt you will like it especially if you are 1jz. PS where in QC are you located?


Ninja edit

http://www.supraforums.com/forum/showthread.php?t=545962

 

[rwd]

There is a great thread on SF in the auto xing section regarding exactly this turbo and small turbos for response.

They talk about putting on the larger housings for more power but it's more of a band aid since it just moves the powerband further down the rpm range. I recommend more boost by adding a meth kit for some more power if you don't want to loose the low end. Otherwise a 35R is what you should be looking at since it's 61MM wheel will make more power, you'll loose some low end but be rewarded more then the 3076 top end.

40R will be a huge lag increase over what you have now and I doubt you will like it especially if you are 1jz. PS where in QC are you located?


Ninja edit

http://www.supraforums.com/forum/showthread.php?t=545962

I think couple of guy on this forum have 1j with gt4088r , i would like comment from they're experience . From what i read , lag is overrated , he probably hit full boost at 5000rpm?? on 1j . garrett produce very fast spolling bb turbo

i want big power 1j :evil2: and lag is not trouble if he don't have too much

for last question i live at south of montreal; you can probably read my french accent :biggrinbo :biggrinbo

 

[BigSupe]

What would a 0.63 housing be like at the top end with stock cams at 1.3bar?

Thinking of swapping from a 0.82 to get quicker spool

 

[rwd]

that what i had:

gt3076 .63a/r with hks 264's
------------------------------------------
i think 3076 is too much similar to the twin

i sold my 3076 , and i 'm actually put a 4088 .95a/r :evil2: , that will be a beast; that will be ready in couple of day

 

[dmiller]

would anybody know if a t51r kai would work on a mk3 supra?

 

[Gritz]

that what i had:

gt3076 .63a/r with hks 264's
------------------------------------------
i think 3076 is too much similar to the twin

i sold my 3076 , and i 'm actually put a 4088 .95a/r :evil2: , that will be a beast; that will be ready in couple of day

You can't run 12's with 400+whp???

 

[JPsToyota]

You can't run 12's with 400+whp???

Ya, I thought that too when I read 114mph. I guess it's normal or something to run 13's @ 114mph in a Supra, nobody else said anything about it :biglaugh:

Sounds like OP needs the traction mod more than anything else.

Good luck with the new turbo though!

 

[Gritz]

Ya, I thought that too when I read 114mph. I guess it's normal or something to run 13's @ 114mph in a Supra, nobody else said anything about it :biglaugh:

Sounds like OP needs the traction mod more than anything else.

Good luck with the new turbo though!

ya, at 400whp i hope to in the 11's....

I believe i read that turbo is only good for about 475whp...not sure..

 

[rwd]

You can't run 12's with 400+whp???

Ya, I thought that too when I read 114mph. I guess it's normal or something to run 13's @ 114mph in a Supra, nobody else said anything about it :biglaugh:

Sounds like OP needs the traction mod more than anything else.

Good luck with the new turbo though!

ya, at 400whp i hope to in the 11's....

I believe i read that turbo is only good for about 475whp...not sure..

yeah , i probably can do mid 12's with slick and more experience , but the top end power really sucks with this turbo,all the power is before 4500rpm and below that , the engine can not breathe correctly,with this kind of power , i can sell my car for buy a mustang!!

 

[BigSupe]

This is my dyno with a gt3076r, 0.82 housing and stock cams, 1.3bar

that what i had:

gt3076 .63a/r with hks 264's
------------------------------------------
i think 3076 is too much similar to the twin

i sold my 3076 , and i 'm actually put a 4088 .95a/r :evil2: , that will be a beast; that will be ready in couple of day

 

[rwd]

here is my number with my new setup

i mixed 10L. of c16 with 40L. of pump gaz to push at 28psi

 

[Guyana00]

Nice, but the powerband seems narrow and the turbo seems a bit laggy. I think a 35 would have done well.

 

[MA702Tone]

Hello RWD, I was wondering looking at all the post and had a weird thought!!! I never found out the intention of the supras use??? If it was for the 1/4 what about clipping the turbine on the .63 to possibly 10* and see if that will help on the breathing issue for the top end of the power band??? If not suitable what about the .82 clipped 10* to retain the almost off idle boost??? Also did not know what gear set your running on the diff??? Currently I am on a 4.30 "weak" lsd with auto trans (condition unknown other than it works, and shimmed accumulators & Valve body pressure regulator set to 90* left lol) a ct26-60-1 upgrade at 11psi, and in need of tires in rear. 0-100 is fairly quick by the seat of the pants feel. Looking in going to the track and make a few passes in a couple of weeks or so at Bristol Tn.

If its use was for XCross would the .63 not clipped, and a 4.30 diff not be great??? IIRC “As he said that boost was off idle pretty much "??? I know that I suffered on a XCross event with 10 psi on boost with a stock ct26. With auto trans, and a 3.7? Gear set. Keep in mind that this was on a so called “higher speed track in S.C.C.A “. Some rear sliding was certainly noted if kept on the upper 4>k rpm..

Now with the 4.30 and a clipped ct-26-60-1 on a shimmed accumulators and valve body pressure regulator on an unknown condition auto trans is would feel great for XCross.. I am a lil tired so if this does not make any sense I am prepared to be flamed!!! :cry:

 

[Mk3Soup]

hey guys, got offered a GT35R (1.06) for a steal of a price off a mate (came off a 13B rx-7 that had just been built but they decided to go for a bigger turbo)

was wondering if this is going to be overly laggy (w58 w/ 4.30 LSD ATM) . just hoping for some sort of boost pressure <4500rpm.

am currently deciding between 264 and 272 BC cams from the group buy aswell, how much do you think they will affect response?

any opinions? this is for a 1j btw.

 

[rwd]

Nice, but the powerband seems narrow and the turbo seems a bit laggy. I think a 35 would have done well.

Hello RWD, I was wondering looking at all the post and had a weird thought!!! I never found out the intention of the supras use??? If it was for the 1/4 what about clipping the turbine on the .63 to possibly 10* and see if that will help on the breathing issue for the top end of the power band??? If not suitable what about the .82 clipped 10* to retain the almost off idle boost??? Also did not know what gear set your running on the diff??? Currently I am on a 4.30 "weak" lsd with auto trans (condition unknown other than it works, and shimmed accumulators & Valve body pressure regulator set to 90* left lol) a ct26-60-1 upgrade at 11psi, and in need of tires in rear. 0-100 is fairly quick by the seat of the pants feel. Looking in going to the track and make a few passes in a couple of weeks or so at Bristol Tn.

If its use was for XCross would the .63 not clipped, and a 4.30 diff not be great??? IIRC “As he said that boost was off idle pretty much "??? I know that I suffered on a XCross event with 10 psi on boost with a stock ct26. With auto trans, and a 3.7? Gear set. Keep in mind that this was on a so called “higher speed track in S.C.C.A “. Some rear sliding was certainly noted if kept on the upper 4>k rpm..

Now with the 4.30 and a clipped ct-26-60-1 on a shimmed accumulators and valve body pressure regulator on an unknown condition auto trans is would feel great for XCross.. I am a lil tired so if this does not make any sense I am prepared to be flamed!!! :cry:

on the dyno sheet that look laggy, but on the road its different story,it's alot more fun than my gt30 setup.With the gt40, the engine rev faster and come in boost rapidly , i probably kill the gt30 setup from first gear to fift gear

the car is actually build for street and wenk-end drag , i understand that gt30 would be better in xcross ,but i don't do that. i have a 4.10 rear end

 

[IJ.]

"Lag" is overrated as 1psi on the 40 is always going to produce more power than 1psi on a 30, and even if the larger turbo doesn't fully spool for another 1000 rpm by comparison it's still making more power to that point.

 

[Pernilongo]

Great thread. very interesting

 

[Zazzn]

AHHHH you where at the Quebec supra meet.... So was I... I saw you dyno in the black 1jz.....

It sounded pretty nice but the powerband is laggy regardless of what you say

I ran a similar lag setup (even laggier by a good 500 RPM) and it wasn't for me... I think with your GT30 setup you should have added cams and added more boost.

I'm sure you could have cracked the 500 Mark.

I was at the supra meet with the Black MK4 Supra. I made 407 WHP and 413 TQ on the stock twins though a stock downpipe and both cats!

Your dyno did sound pretty mean man... Was pretty impressive I must say!

 

[Guyana00]

Anyone have a dyno with a gt35, different sized housings?