Rotary_Rocket_87

I recently picked up an AiResearch T04 turbo. The only thing I have been able to figure out is that it has a 1.15 A/R hotside, and it is twin scroll. I am planning on installing this turbo on an '86 N/A in the near future. I was just wondering if anyone could tell me more about this turbo. On the hotside the only cast mark is the A/R 1.15. On the coldside there are a few: a solitary 8(?), a solitary T(?), what I think is a serial number of 8274-224, and M10(?). Thanks in advance for any help. Here are some pics.

Rotary_Rocket_87

Here are a few more.

zbrown

Pull the compressor cover off and measure the inducer and exducer of both the compressor wheel and turbine wheel.
that will give all the info you ever wanted..... just cross them with a chart to find what trim and specs are of the turbine and comp.
like this one http://fc3spro.com/TECH/TURBO/tmodels.html

looks like Ptrim turbine with a smaller compressor
1.15 is big you know.... are you running stock ports?

With a full T4 turbine like you have....you will have alot more pontential than a hybrid with a big compressor and still the small stock turbine...even if your compressor isnt as large as the compressors found on some hybrids.
zac

Turblown

iTrader: (12)

Thats a garrett B25, off a diesel truck...

https://www.rx7club.com/time-slips-dyno-128/my-dyno-502176/

Rotary_Rocket_87

From my measurements (with a 1/32 graduated rule, my dial calipers have a dead battery) and the link provided by zbrown I confirmed it is a P-trim turbine with a V-trim compressor Garrett T04B. Granted, because of the lack of precision measurement, I could be wrong, but that was the only measurements on the chart that were even close.

If I am wrong, and it is a turbo from a diesel, how did you come by that conclusion? Any supporting info for that? I just want to know what this damn turbo is so I know what is going to be on my car. (Or if I can't use it at least I can have the information to give to any potential buyers.)

As for the question about whether I will be running a ported engine or not, I plan on a rebuild with a mild street port before installing the turbo. Thanks again for the help.

Turblown

iTrader: (12)

Its a very common cheap turbo for rx7s. I'm just taking an educated guess based on your pictures. However its wheel is much smaller than a V trim, what did you get for inducer and exducer measurements on the comp?

zbrown

To me if that is a 3" inlet, it def looks about like a Vtrim
my opinion

Rotary_Rocket_87

The minor measurement on the comp was 2.125 in. and the major was 2.75 in. the inlet itself measures a touch under 3" inside diameter.

fastrotaries

Twin Scroll? You have a divided housing, not twin scroll, that mechanism is usually found on the manifold. Especially on 7's.

bobybeach

Your rite that is a t04b V trim compressor with P trim turbine. That is a great turbo especialy when used with stock s4 or s5 wastegated turbine housing. It will be gd for aprox 350whp @ 10-14psi.
f you need more *****.... the compressor can be high flowed to a 60-1 super trim t04b in the future for small fee.
Id recomend using with smaller turbine housing, but it will be fine as is.

Rotary_Rocket_87

Thank you for helping me figure out what kind turbo this is. I was wondering, while we have a pretty informative thread going, if I could get some feedback on a few different setups I have thought about. I am pretty mechanically inclined, but I am new to the tuning aspect. Mainly the difference in these two Ideas is the setup of the hotside of the turbo. I know that I will have to upgrade the fuel system (larger injectors, pump, and either a Rtek chip or SAFC). I am not sure of the size injectors I will need, or how far I have to go with the rest of the fuel system.

Idea 1: s5 ex. manifold and wastegated hotside w/ stock downpipe, ect.

Idea 2: Custom ex. manifold, retain the hotside on the turbo, with either single or dual waste gates.

Other things I am planning on are a FMIC, and some more basic things like E-fans, CAI, and such. If and when I can afford it I'd like to have the motor streetported too.

zbrown

I would definately go with a larger turbine wheel, than the stocker.. So idea #2
The potential is much more... the P-trim is a great wheel on our engines

Rotary_Rocket_87

The only concern is if I can't afford to streetport the motor, will the turbo spool up quick enough. I would like to keep the lag to a minimal (obviously) as this is going to be driven on the street alot more than it will on the track.

Turblown

iTrader: (12)

If that is what you are worried about, move to a smaller compressor and concentrate on intake charge density....

bobybeach

The compressor is not a concern. The v trim to4b is a very responsive compressor. But the 1.15ar housing is huge for 13b that only needs to flow 350whp. I’d recommend running the s4 housing on custom manifold and stock ported internal wastegate. The 1.15 will work but it is unnecessarily large, a smaller housing will be much better suited unless the budget won’t allow.

Rotary_Rocket_87

OK, the P-trim wheel is a good thing to have, and the 1.15ar hotside is big. I understand this, but will a P-trim wheel fit in a s4 housing? Or if I use a stock housing will I have to change the wheel also? Sorry for the noobness, but this is the first turbo I have ever worked with.

Turblown

iTrader: (12)

A P trim will fit in an S4 housing, however you're going to be seriously choking on the turbine housing( runners are very small, and neck down inside)

bobybeach

Not as much as you mite imagine though. I have run the s4 housing with p trim with both t04b and large T-58 compressor on full bridge 13b with no problems. I now use 1.00ar t4 but I don’t think it necessary at the power levels he will see with that compressor. Like a say I was using with much larger compressor also @1.1bar. It really does surprisingly work well.

Rotary_Rocket_87

Judging from your info I think I have a decent plan. Until I rebuild the motor I will focus on just using a turbo manifold and an S4 housing. Later (When I can afford to do a Atkins rebuild and streetport) I will probably use the 1.15 AR hotside and fab up a custom mani. Now that that is taken care of what should I do about my fuel system. I have Orange stock injectors (IIRC 680cc) I was thinking maybe 720 cc secondaries with an aftermarket FPR and a walbro 225 lph pump. I already have replaced the PD with a banjo also.

zbrown

who is to say to use the large 1.15..... use a smaller housing with the ptrim... then once you have ports to support a larger hotside AR then jsut change the turbine housing out.........all your going get out of messing with the stock turbine is doing things twice

Hell i have a divided .84 Ptrim housing sitting at my house.

whoever pormotes stock turbine housings should really look at back pressure levels.
If you ever felt the difference betweenn a stock hotside vs a P-trim at the same PSI you would never go back.... no way in hell

**** i run a 1.15 Ptrim and love it... spool is not a problem, but i have a large street port

running lets say .84 will give the spool you want on stock ports, yet have alot more flow than the stock hotside.....

bobybeach

were talking about runing the t04b with a s4/5 hitachi turbine housing not an hitachi turbine.

hondahater

iTrader: (2)

when bnr does their stage 4 upgrades, they put a ptrim wheel in the stock turbine. Some have seen upwards of 400-410whp with that setup mated with a 60-1 compressor. Not sure if this helps any.

RacerXtreme7

iTrader: (2)

You guys are missleading the original poster . The s4/5 hitachi turbine housing does not just "fit" on his T04. He's going to have to get the stock turbine housing bored to fit his P-trim wheel. This is going to require him to go to a experianced turbo shop/builder with proper tools for boring. Don't forget to PORT the wastegate.

~Mike.........

Turblown

iTrader: (12)

You have or one of your customers?

bobybeach

I had this set up on my car, but sold now to customer,
on 3"/2.5" exhaust and bored wastegate whole I was able to hole .4-.6bar depending on wether the p trim turbine was clipped or not.
I miss this set up....