GtiR turbo, I need some advice.

[Rage_sixtynine]

Hey guys,I just got a blown GtiR turbo for $80 from Steven(TireSmokeS13) over at Zilvia.net. Anyway, I am going to rebuild it. When it comes time to install, I need some advice from you guys. -The turbo didn't have a wastegate actuator with it, can I just fabricate a bracket and use my CA T25 actuator? or do you guys think I should I get an HKS actuator and have to fab a bracket for it? or will I even have to fab a bracket for it?-Also, I have a Horsham developments stage 1 chip, it says that it's good for 15 psi on stock turbo. How much boost from this turbo do you guys think I could push safely?-Also, I have searched but I get mixed answers, when do you think this turbo will produce full boost on my CA?

My current mods consist of:1990 Gold 240sx CoupeCA18DET manual swapHorsham-Developments Stage 1 chip1992 240sx Hicas VLSDClutch appears to be a Nismo 10 puck sport disc and flywheel (came with CA18det)MKIII Supra fmic with custom pipingPower Interprises cone filterKA24E throttle bodyWalbro fuel pump w/ z32 fuel filterNismo Adjustable FPRKoyo stock replacement radiatorPermacool 12" electric fan w/thermostatMegan 3" turbo elbowProject Silvia 3" downpipe w/resonated test pipe1992 240sx wheelsBlitz Turbo TimerRSR Down SpringsKYB adjustable struts

Thanks for you advice in advance,-Trent Christopher
Modified by Rage_sixtynine at 10:19 PM 9/21/2006

[Ca_Silvia]

Any where betwen 10-12psi. you have a good list of mods but you still need larger injectors to wrench out any more boost safely

[rico05]

IIRC the HD Stage3 chip is the GT28R chip, right? And considering the larger compressor of the GTiR to the S15s GT28R, you would also need some more fuel correction with those bigger injectors. Too bad the HD stage 3 ship is what, $200+?

If I was you, I would go for some 550s (to be safe. I bet you could go with 450/460s, but you would need to keep a close eye on the duty cycles when you tune it...Dee can steer you in a more accurate path here) and get someone here on NICO to brew you up a ROM, as well as a S-AFCII. Since the NEO came out, I have seen SAFCIIs go for good deals second hand off eBay.

[kapower06]

Your ca actuator should work. Not 100% sure but as long as it physically attached to the swing valve assembly then you just need to get it bolt to the compressor housing.

With the stock maf and my bigger turbo Im maxing it out around 11psi. WIth the stock CA it was around 15psi. Im not sure with the chip though.

About the chip... How much did it cost ya? also would you reccomend it? Hows it feel?

[Rage_sixtynine]

kapower06,I would recommend the Horsham chips, most of the uk guys over at SXOC.com seem to love them. I have noticed an increase in mid-range torque, Horsham says that you should check your base ignition timing after installing the chip, I haven't checked mine yet, I will before I get my GtiR turbo on. I'm still running stock boost on the CA T25. I don't really expect to see alot of gain from the chip until I turn up the boost, so we'll see how it feels when that happens. Thanks for the advice guys. I will probably turn boost up to about 10-12 psi and see how she does, I will increase in small increments at first. Thanks again.-Trent

[fluent]

~10PSI without a tune~12PSI+ with tune should be easily fine (550CC Injectors & Z32 AFM will help)

Full boost by ~4000rpm

T25 Acuator is fine to use, just have to make a custom bracket (suggest using HKS if possible)

Not too familiar with HD chip, but at least 10PSI is possible on stock ECU without any issues...

Also When rebuilding it... see if you can use a S14 T28 exhaust housing, because the GTIR is laggy (0.86 A/R).. and sure its insanely/ludacriously fun when pushing 18PSI thru it... it's still boring as off-boost :P (On/Off rather then response!)

I'm running a similiar setup with GTIR Turbo :P

[Rage_sixtynine]

Fluent,Thanks for your advice, looks like you have a really nice car there, quite a list of mods. I expected that the 0.86 a/r exhaust would give me less response. I do want to put a 0.64 exhaust housing on it, I have another turbo here that I purchased a while back that has the same size exhaust wheel and a .64 a/r, I tried swapping the housings, it's a no go, where the housing meets with the center section, they are 2 different sizes. But this turbo isn't a garrett, so I would think that if I had a garrett housing it should work. If you know anyone that wants go get rid of one, let me know. Again, thanks for your advice.

-Trent

[Rage_sixtynine]

If I got a SSautocrap manifold, how much do you guys think that would reduce my lag? Also, where do the t28 turbos normally get their wastegate signal from? I dont see a nipple on the compressor housing, or the compressor outlet. Its no big deal, I can put one in, but I was curious.Thanks,Trent

[fluent]

The stock exhaust manifold in my opinion is fine for even 300rwhp and I personally don't see much benefit going aftermarket, not to mention is stronger then most generic stainless steel copies going around which tend to pop their welds. Nissan did their homework!

There is no nipple on the T28's, so you can get your reading by welding on a nipple onto your intercooler hot pipe and attaching the hose there (thats how I have it set up). Else on my mate's car he has t-pieced onto the small vacuum hose leading to the carbon canister... wouldn't recommend personally.. but it works (for him at least), he also is using a bleed valve instead of the stock boost solenoid.

In regards to the exhaust housing not fitting, I'm not too sure about that.I have simply read on SXOC that S14 T28's exhaust housing's are a pretty much bolt-on affair. (Although Turbonetics told my friend that that isn't an easy job and would cost $$$ when he rebuilt his GTiR turbo.)Going by Turbo specs off by memory that would make the GTiR turbo similiar/exactly like a S14 T28.

[Rage_sixtynine]

fluent,thanks again for the advice. Yea, I would think that an exhaust housing from a s14 t28 would probably fit without a problem, but the one that I was using wasn't made by garrett, i'm sure thats why it didnt fit. As for the stock exhaust manifold, maybe I'll try to get in there and port match it, and leave it at that. Also, the nipple, I'm thinking of drilling a hole in the compressor housing and tapping it for a nipple, there is a location that looks like that might have been garrett's intentions. Thanks again.

-Trent

[Rage_sixtynine]

Hey guys, I had another question, after I rebuild this turbo, do I have to have it balanced? or do you guys think that it will be close enough since i'm still using all of the "already balanced" parts. I believe that the only thing on the rotating assembly that I will be replacing is the nut on the compressor wheel. I'm going to mark the compressor wheel position in relation to the shaft when I disassemble it, that way I put it back together the same way it came off. You can probably only put it on one way anyhow. If you guys think that I should get it balanced, then where can I have that done? any ideas? Thanks again, you guys are always a big help.

-Trent

[fluent]

Not too sure whether it should be balanced, but imo it should be :P

http://website.lineone.net/~jon_ed/Turbo_Table.htmHere is an interesting table!

[Rage_sixtynine]

thanks for that table man, I had already started something similar myself, but mine is a little incomplete, and it has nowhere near as many turbos !!