rx7tt95

I am in a bit of a dilemma...my current turbo is in need of a rebuild to put it mildly, and I am just going to replace it with something different. I ordered a GT40R ball bearing turbo through Aspec and through no fault of theirs, the arrival date is a bit longer than planned. Long enough that my current turbo probably wont make it. Being a daily driver, I need to get something on this car soon and I am looking at other options, specifically the Innovative GT66BB turbo. The compressor maps are very similar. I called Innovative and the turbo is quite a bit more expensive, about $1895 with all the fittings, Vband and a Ptrim Inconnel turbine. Flows 70lbs. a minute. Pricewise it is stretching things a bit but it might be doable for me. I know that forum member Greg is an innovative dealer and perhaps I can get something slightly less expensive through him. Unfortunately his webpage does not work.

Another forum member may loan me his GT40R until mine comes in (at which point my turbo will go to him) but barring that, it seems like the GT66BB would be the best alternative. I have attached the 66 compressor map.

I currently use the GT40R 88mm compressor (exducer) on my T78 and it makes wonderful (understated) top end power. Jason put down 460+ on pump. Good enough for me and I dont want less than that. Really. Am I making the right move here? Feedback appreciated....

rx7tt95

Compressor map for the Garrett GT40

rx7tt95

I read in another post that the GT76 literally fits right in (except for the Vband) on the GReddy T78 kit. Here is the GT76 compressor map.

rx7tt95

doh, forgot the map

rx7tt95

double post

maxcooper

One of the local folks here made 497 RWHP on an Innovative T66 (BB, I think).

-Max

rx7tt95

Crap, really? I'm assuming that was on race gas?

zayrx7

jason put down 508rwhp

rx7tt95

I'm not really concerned with race gas figures at the moment. I currently have the exact same turbo as Jason. Actually, Jason has the same turbo I do Also, it's pretty hard to compare two turbos on different engines with different anciliary parts and different tunes, no?

spoolin93r1

i was under the assumtion that jason had a t78 with an upgraded exhaust wheel?

Heath

iTrader: (11)

I think it's the compressor wheel, not turbine.

rx7tt95

Yes, it's the compressor wheel. Majestic Turbo in Waco, TX does the upgrade which uses the Garrett 88mm GT40R compressor mated to the stock Mitsubishi turbine. They machine out the compressor housing quite extensively.

maxcooper

I am pretty sure it was. I don't know the details about how much boost, what can it run on pump gas, etc. But the turbo flows enough for 500RWHP and then some.

-Max

the_glass_man

iTrader: (2)

And it's already taken a dump on you?

rx7tt95

Yup. Not sure why either...the engine took forever to get running right, then I waited about 4 months for turbo gaskets from GReddy (so no or low boost) and finally, when everything was good, no oil leaks, whatever, wham, start seeing smoke coming out of my hood. At first we thought it was the OMP lines and it was actually...replaced with braided stainless from Gotham Racing. Still smoke. We put a mirror underneath the turbo while the car was running and used a flashlight to illuminate the bottom of the turbo through the mirror. Sure enough, there was oil dripping from where the turbine housing meets the CRHA, right on to the headers. Not good...so Im tooling around at the moment hoping a) the car doesnt catch on fire or b)implode and send shrapnel into my intercooler. I plan on sending it back to Majestic to find out exactly why it did what it did and to have it rebuilt.

Heath

iTrader: (11)

I hope they gave you some kind of warranty?

rx7tt95

Dunno...it's been over a year since I had it rebuilt. I'm wondering if the leaking turbine inlet and downpipe gaskets had something to do with it's failure. I honestly don't expect to get an honest answer out of them in terms of what they think went wrong. I may just send it to them and not tell them they were the ones who rebuilt it and go from there.

Heath

iTrader: (11)

Yeah that may be your best bet. Hopefully they will give you an unbiased analysis and then you can say....."Oh yeah, you guys rebuilt this the last time so I only think it's fair that you work with me on this thing!"
Very best of luck. I can't wait to see how things go with your new turbo (whatever that may be)

rx7tt95

It's either going to be a plain bearing GT40, BB GT40 or Innovative at this point. I'm going to give it a day or two as according to ATP, they should be receiving a shipment of 40R's any day now. I am having trouble justifying $1900 for a turbo from Innovative. I could get the plain bearing GT40 and save a grand.

villision

yeah i thought jason ran upgraded T-78...so doesn't zay again..that is what i thought...

Ty

boostedrotor

i have the innovative gt-66 on my car, it's not fully tuned yet, running out of fuel pressure @ higher rpms so i am putting in another fuel pump....it is a bad *** turbo, i have the dual bb q-trim and we are seeing positve mainfold pressure @ 2k rpms.....we are going to tune this car for 27-30 psi on race gas with water and methanol injection....the other night we turned the car off from idle and timed how long the turbo still spins, right @ 1 minute....now thats a free spinning turbo....btw, this car is entered in the ultimate street car for next year....

rx7tt95

Not to burst your bubble, but I see positive manifold pressure with my plain bearing upgraded T78 now. I can stomp on the gas at 2K rpm and see 3psi.
Show me some real numbers for the $1800 you spent on that thing using old school "T" technology...

Badog

Man, I hope it doesn't blow chunks like the Skyline and Mr2 did.

Look at this years winner....no 20+psi. No huge turbo.

The Skyline blew due to oil stravation. The Mr2 for trying to be a dyno queen.

Previous Rx-7 winner was on stock turbos and setup for autocross (and a champion car too). And they probably will try to keep us FD owners out unless we're running 20psi+ and setup for straight line running...for entertainment value of blowing up.

So, unless your whole car is re-engineered and setup right (sounds like you know the importance of some of the major systems like fuel and cooling) it ain't going to happen.

BTW...we timed a GT35/40 spin down at over 1:13 seconds after a 3 minute idle.

Good luck. We're root for you, but do us proud.

setzep

My TD07 did this same exact thing! When I first got my car running with the new rebuilt TD07 it was fine, no smoke. After about 100 miles I started to see smoke from under my hood. The oil would drop from in between the main body and the turbine housing. All I did was put in a smaller restrictor and the problem went away. Now over 3000 miles later it still doesn't smoke I'd say it's worth a shot to put a smaller restrictor in there before you go buying a new turbo.

rx7tt95

Yes, that's exactly how mine is leaking! I also have too much shaft play hence the need for a new turbo. I run a -3AN line now so it's a fairly small line. But I'll try it and see if the smoke will go away. It'd be well worth it because it's a major PITA. What exactly are you using as a restrictor and where did you place it? I still have the bajo bolt inlet on mine. I also replaced the oil drain line which seemed to help a bit.