THere is a car in the forsale section with a T88 on it. I am interested in the car, but want a smaller turbo. Which turbos will mate up to the Exhaust manifold/flange on the t88 kit? Its a T4 flange correct?
I'm assuming a T78 would fit, are there any Garret GT series turbos that would fit with less lag? I know the 35/40 is a different/smaller flange and needs an adapter. How about like a t66 BB? I think Innovative makes one. Or does turbonetics make a dual ball bearing turbo that will mate up? Thanks for any info!!
-Rob

 

gt35/40 uses a t3 flange.

i believe a t78 and a t66 will both bolt up (t4 flange). Just a matter of how much power/boost/race gas you want

fwiw jason from rx7store made 506rwhp on a t78 (on pump gas, right?). i haven't seen any dynos for the t66bb. i would guess 450-475, possibly more.

 

Thanks for the info:

Does anyone know if there is currently available a Garrett Dual Ball Bearing GT series turbo with a T4 turbine? GT40 or GT40/42? Google isn't much help.
I've heard ASpec has something along these lines in the works?

Does anyone know where i could pick up a T66 or similar dual ball bearing turbo?

How do people usually modify the oil lines and all that **** when going from a oil cooled/lubricated turbo to a dual ball bearing one?

Thanks for any info!

-Rob

 

I don't know how small you want to go, but the turbonetics t-70 has a really good compressor map, and is what I'm planning on putting on my rx7. It is in the full efficency range for about 15psi for 400hp, all the way to about 700hp at 30psi. it has a very broad range.

 

I'm looking for something a little smaller, 64-67mm compressor preferably, and a relatively small t4 turbine with an A/R around 0.8-0.9 I will primarily be using it for 10-18psi, and never much above that. If i can find a used Innovative or Turbonetics Ball Bearing T64 or T66 i think that would be just about perfect for what i'm looking for.

Just noticed you were in charleston. There aren't a lot of FD's in that area, i only ran across 2 or 3 in my time there. What color is yours and have you been in charleston long?

 

10-18psi might not be enough boost to really get full potential out of a T66. I'm not sure how different the BB T66s are from the non ball bearing ones.

 

the 66 spools pretty fast as it is. You may be happy with it being standard. The bb will spool like 400-500 rpms faster. There are downsides of bb to. they cost more.
10-18 psi, sounds like you would be best with 60-1 or 62-1.

 

mines red, and I just got it about a month ago. I was orignially going to put the turbo on my second gen., but I ended up getting this one which has a brand new street ported engine, and new turbos

-john

 

Rob,

Check with Sean of A-Spec Tuning. They have just started offering the GT40R which is a bb GT40. Also, you can check on the T04R or T04Z(bb T04R). The one thing that you do need to think about though is that any of these turbos don't hit their efficiency range until 16psi and up, way up!! If you only want to run that kind of boost just get the GT35/40 kit from A-Spec. It comes with the mani, turbo, and dp for a really nice price. Just some food for though. I'm really glad to see that you are getting back into 7's!! I was scared that you were done with them when you sold your last FD. Take care bro.

Zach

 

Zach.
yeah, definitely need a 7 again, the bimmer isn't cutting it. If i was starting from scratch i'd definitely go with the gt35/40, no question. BUT, as i said in my original post there is a car on the forum for sale with a T88 kit. I'd prefer to just take out the turbo and replace it with another smaller turbo with T4 turbine, which the GT35/40 is/does not. So as i said before i'll probably just try to find a 62-1 or T64 or t66 or something that will bolt up rather than removing everything for a whole new kit. I might just go with a T78 again even though its a bit bigger than necessary for my needs, but never hurts to have extra if you need/want and t78's are a lot easier to find. T04Z would definitely be an option if it was a reasonable A/R on the turbine and <68mm compressor wheel.

 

Look at that GT40R and the T04Z. You can get different A/R's for both of those turbos last I checked. If not then I have seen a few FD's running full bb T66's and they LOVED them. Those would be my recommendations for you. Take care and PM me if you need anything. Laterz.

Zach

 

Why not sell the T88kit and put that to a new kit? Probably would come out the same in the end costwise maybe even less.

 

Well if i go with different manifold and kit then there is much less of a chance that intercooler piping will mate up. Which means more fabbed piping and significantly more effort of uninstalling and reinstalling. New gaskets and/or vband, among other things. I'm mechanically inclined and feel cofident replacing a turbo and orienting it so that it will mate to pre existing intercooler pipes but changing out the whole kit might be more than i want to mess with, especially since it will be a daily driver and i won't have much down time for taking stuff out and putting stuff back in.
That being said, replacing it with a GT35/40 kit is not out of the question.
What are the specs on the T04Z? compressor wheel size and turbine A/R. WHich is smaller? GT40R or T04Z?

 

you'll have more than the intercooler to worry about ,downpipe 3.75" and its v-band,manifold 2.5" tube's mad lag with a smaller turbo i would sell the whole kit and buy a new one.
Barry

 

Thanks for the info Barry. Would the same hold true swapping out with the T78. I had just assumed that the T78 and T88 kits were the same with the exception of the turbo. Do they not have all the same inlet and outlet piping sizes

 

They're pretty much the same (78/88). Personally, if everything else is in good condition, the easiest thing would be to swap out the turbo. Get something with a V-band discharge and modify your downpipe. GReddy support parts such as gaskets are impossible to come by which is why I'd like to dump mine. I've been trying for four months to get a single turbine to downpipe gasket for a T78. GReddy uses their own exhaust housing and thus stock Mitsu gaskets don't work. I'm a bit bitter so honestly, I'd sell the whole friggin kit and get something else. Switching to a different turbo is still going to mess your IC piping up as well as your downpipe unfortunately. GReddy sucks. I'd strongly suggest anyone look elsewhere for a single turbo kit based on customer support and availability of support parts. Oh, I have heard that Innovative makes a turbo that has essentially the same "frame" size and will swap right in. Don't hold me to it :-)