SPRAYED 01

iTrader: (22)

Just had a good conversation with justin at comp turbos. For $300 they can make me either a 1.15,1.32 or even a 1.52 ar housing. I already don't have much lag so I think I'm going to go with the 1.53ar and call it a day.

SPRAYED 01

iTrader: (22)

1.52 housing. Do you guys think it would help changing the intake side? I hear they make a race cover

Johnv

As said above , I have a 383 and TC78, with the .96 housing power would peak at 5000 rpm then fall off fast, would drop 100 hp by 6500 rpm.

I managed to source one of the last 1.32 housings, and what a difference, makes power right to the limiter 6700 rpm, and no noticable difference in spool time.

I have since made a new downpipe that steps straight up to 3.5" after the "V" band and that has made a noticable difference in spool time.

I'm running up to 18 psi boost and there is still a bit more left in it.
would like to upgrade the compressor side to a race cover, but would like some feedback from someone who has done it to know if its worth the hassel of shipping the turbo back and forth to have it done.

rotary1307cc

iTrader: (5)

Thanks for chiming in Johnv!!

Sprayed 01 I am going to have justin do that to mine too. Let us know what happens, maybe we could send our turbos at the same time and get a little break?

JAX04

iTrader: (17)

rotary and sprayed, let me know and keep us updated how this works out, i may be interested as well

HydroStream6

iTrader: (16)

Johnv, are your sig times current with your 1.32 housing?

JAX04

iTrader: (17)

Not sure what kind of room your working with, i dont remember your build, but the race cover is a full size housing, and im told its huge.

SPRAYED 01

iTrader: (22)

I should be able to get it off after the holidays and send it out. If anyone else wants to do the same pm me. Il call justin and work out a group buy deal.

What were your hp numbers before and after the housing swap?

HydroStream6

iTrader: (16)

Yea I'm interested in time/numbers as well. I've gone 136 and consistently go 134-135 on my .96 TC76. If he's only going 129 after the 1.32 swap I can't see much merit in it.

While this custom housing interests me, I doubt I'll do it. I put $250 into getting this .96 housing last season (had a .81). I don't really wanna put another $300 into it for a "band aid" type fix. I'd rather just go with the bigger turbo.

Josh@KY-Turbo

iTrader: (120)

I wont knock the Bigger A/R housing at all. I dont understand the issues though. My old shop car trapped 131mph in the 1/4 while running 10.9's with a shitty 60' on 8lbs of boost. It eventualy went a best of 9.6x at a hair over 140 with 15lbs of boost. This was all done a TC76 with a .96 A/R. I am very interested in your all results.

Just for refrence my combo was:
iron 370ci 8.7:1
Speed Inc TU1 cam
Stock 6.0L heads with 918 springs
LS6 Intake/TB
TH400 3000 stall
9"
3.25 gears
325/15/15 DR

mike13

iTrader: (27)

I don't understand it either I just know what happened, I mean the car felt like all the timing was pulled out of the tune. On the freeway the car pulled harder in overdrive.

Josh@KY-Turbo

iTrader: (120)

I am damn tempted to put the 370 I have now in my 02 Formula and make back to back comparisons on the TC78 with the various A/R ratios. I dont have time to build the car to run a class, and doing the setups to do get solid info would be a blast.

mike13

iTrader: (27)

All I can say is the car would just fall flat on the top, installed a ST80 w/1.1ar and it doesn't do that anymore. When the TC76 was signing off is about where the ST80 is really hitting it's stride.

rotary1307cc

iTrader: (5)

Yeah, I really don’t have an issue.... it just seems that if I could let it breathe a little easier it would be a happier engine... I could loose some spool too as it is ridiculous right now

I really want to trap in the 145 area on under 10 psi, so that is my goal

It did 134 with no IC on 8 psi with 30 percent converter slip so we will see

Josh's glide will help

Josh@KY-Turbo

iTrader: (120)

It should be on the way to you. R&L Freight. I will get you the Pro Number tomorrow.

HydroStream6

iTrader: (16)

What was your race weight on that combo? I'm going 135 with a 4000+lb car plus me (270lb). Was there anything left on the table going mid 9s?

Johnv

Yes 10.98 @129mph, but i am handicapped by my M6 and a heavy 4 dr car remember

I gauratee it would be a low 10 sec car with a well sorted auto

Johnv

I've seen pic's of the two together , compressor housing prob 1 " bigger in
radius, should squeeze it in ok.

overhere

iTrader: (2)

this might be a dumb question but i have a tc78 with a .96 and its very tight if i went to a bigger a/r is the outside dimension larger?

Grr

iTrader: (2)

yes, bigger