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Gt42 On A Rb25det And Nistune Question

RKLamb

By RKLamb,
in Engines & Forced Induction

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RKLamb Apprentice

RKLamb

Posted
Posted

Hello guys I just recently got a sweet deal on a Garrett Gt42 turbo and I wanted to get you guys opinions on it and the setup I am trying to do. I was going for a holset hx35 or 40 but I got this one for about 100 less. So it seem like a very good deal. The specs on the turo are as listed.

100% Authentic Garrett GT42 turbocharger

- Compressor A/R = .71 Turbine A/R = 1.28

- Compressor wheel Inducer dia = 64 mm

- Compressor Inlet = 4 inch / Outlet = 2.75 inch

- Turbine Inlet is a T6 flange / Outlet = 3.25 inch I.D. V-band

So this turbo is going on a Z32 with

555cc sidefeed injectors

FMIC

Greddy Profec B Spec 2 EBC

3 inch exhaust split into dual exhaust with 5 inch tips

z32 Maf

Rear sump custom race oil pan

As for the dowpipe I have found a few setups off a the Supra that look like they could work. If you look at the measurements posted on the first link that DP looks like it will work. I will probably go with the second one so I can use my own midpipes. I have no wedding skills and in my area no one does this type of fabicating so I figure I would grab something and make it work. This should be very close from what I have seen with Z32s running 2j engines.

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...e=STRK:MEWAX:IT

Also on the ecu tuning. I have a stagea C34 engine. So I want to use nistune. I cannot get a straigt answer to see if I am suppose to use the R33 flash or the R34 which I believe is for a Neo engine. But my ecu is the same style as a Neo R34 engine.

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...e=STRK:MEWAX:IT

Lithium Grand Master

Lithium

Posted
Posted

It'd be very helpful to know what you are hoping to get from it? I am guessing from the lack of high spec engine mods being listed and only 555cc injectors, you aren't aiming for way more than 300kw @ wheels.

I am at work and can't follow that link, but I can say that a 64mm inducer is not normal for a Garrett GT42 - so I can't help but be dubious of how genuine it is, and on top of that any GT42 based turbo is WAY overkill for a 300-350kw setup, it will be laggy as. Even a 64mm turbo is overkill for that...

QWK32 Veteran

QWK32

Posted
Posted

if you engine is a NEO RB25 then use the R34 Nistune board. If its not a NEO then its the same engine as the R33 RB25, even though the non-neo stagea uses the R34 ecu plug type, its still the same insides as a R33 ecu.

Harey Veteran

Harey

Posted
Posted
It'd be very helpful to know what you are hoping to get from it? I am guessing from the lack of high spec engine mods being listed and only 555cc injectors, you aren't aiming for way more than 300kw @ wheels.

I am at work and can't follow that link, but I can say that a 64mm inducer is not normal for a Garrett GT42 - so I can't help but be dubious of how genuine it is, and on top of that any GT42 based turbo is WAY overkill for a 300-350kw setup, it will be laggy as. Even a 64mm turbo is overkill for that...

Exactly, 555cc injectors and a GT42 do not match. A GT42 on a stock RB25 would be sooo laggy its not funny. A GT30 can make 300rwkw and a GT35R can make 350-380rwkw so either one of those would be a LOT better. Plus get some bigger injectors if you are looking for power figures like this.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

You just purchased a turbo from a rotary.

1.28 rear housing is FAR to big even for a 3ltr.

Also add to the fact you have a 850-900hp turbo, but injectors that will only support around 550hp

Sounds like you're just guessing with parts and setup to be honest and need to do some proper research.

PM-R33 Grand Master

PM-R33

Posted
Posted (edited)

Sell the turbo and get something more suited. That turbo is WAY to large for a RB25 no matter what any one says. Not to mention your current setup isn't suited for it what so ever. Surely this has to be a joke.

Edited by PM-R33
Granthem Mentor

Granthem

Posted
Posted (edited)

Bin it

Or if you are certain you wanna keep it, make sure you tap a thread in the rear housing and run a straw into the cabin. The engine will need all the help it can get to spin that turbo, so blow like crazy.

Edited by Granthem
T04GTR Grand Master

T04GTR

Posted
Posted

its a big turbo.. from that inducer size id say its straight of a 400ish hp diesel. 64mm inlet. but it will be able to make 40+ pounds of boost no worries :P

you could get a smaller ex housing, but its still set up for a BIG motor. ps. probably not ball bearing either.

it will have a massive turbine wheel aswell. just not suited for any sort of performance petrol application.

at a guess. it will hit full boost slowly at aroung 5500-6k.

RKLamb Apprentice

RKLamb

Posted
  • Author
Posted (edited)

Thanks for the responses guys. I have never gotten so much attention at one time. Lol. Also it is going on a RB25det I got the idea from a guy on Youtube. I been running a VGtt so Im not too familiar with Rbs and what they use and do not use. VGs have those tiny turbos and when I saw this turbo going dirt cheap I just jumped on it and take a chance. I was trying to get a Holset Hx35 but everyone is after those now.

Here is that video so all of you can get a good laugh.

So on the ECU do I get the board for the Neo or R33. I was thinking that since I have the NEO style ecu I would have too get the board for it but use the R33 flash.

On the exhaust should I go single or should I get a smaller pipe leading to the mufflers.

The turbo is back up for sale I am trying to get a T70 or gt35.

Edited by RKLamb
T04GTR Grand Master

T04GTR

Posted
Posted
its a big turbo.. from that inducer size id say its straight of a 400ish hp diesel. 64mm inlet. but it will be able to make 40+ pounds of boost no worries :D

you could get a smaller ex housing, but its still set up for a BIG motor. ps. probably not ball bearing either.

it will have a massive turbine wheel aswell. just not suited for any sort of performance petrol application.

at a guess. it will hit full boost slowly at aroung 5500-6k.

having said all that i put this on my car lol. post-19586-1265424238_thumb.jpg

RKLamb Apprentice

RKLamb

Posted
  • Author
Posted
having said all that i put this on my car lol. post-19586-1265424238_thumb.jpg

Man that turbo looks about as big as mine. Lol. What model is that. Also other than holset what other inexpensive turbo do you suggest.

Now if I read up right. I can buy the nistune board for the R33 and chip my C34 ecu.

discopotato03 Grand Master

discopotato03

Posted
Posted

Well your call but I reckon a GT4088R would have been better on all counts for any RB25DET while still being too big , more compact and a more efficient unit to start with .

I just don't see 800 odd horsepower bellowing out of an RB25 or if it did there wouldn't be much in the way of RB25 parts left on it .

Really its the head and manifolding that are the hallmarks of an RB25 , 33/34 spec anyway . To justify big turbos I think you need more than 2.5 liters and to survive high revs a non hydraulic valve train makes sense to me . The 26 head is what the six throttle manifold lives on and they don't easily go on any other RB head . I think a 26/30 would be a minimum for these big turbos .

Was it just me or did that "Z25" go a long way up the rev range before the turbo spun up ?

Cheers A .

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