Garrett Gt2860 -9s

[vspecIInur]

That's the same exhaust setup racepace did to mine. A 3.5 inch all the way with no cats (pseudo-cats).

[discoPumpkin]

twins?

3.5" dumps back?

[JTCC]

Drinks water......what a nice long read. Sorry if bumping is a bad thing, but I don't see a point in making a new thread as this one is pretty damn good.

Ok....now that I am a GTR owner, I see why this choosing the correct turbo is such a mind f***. I am literally going nuts. Nismoid has made my brain spin a fair amount also. He makes both options sound pretty good hahaha.

1990 early model R32 GTR. 80,000 km

I plan on keeping the 2.6 liter engine unopened (for now). I prefer to push what I have then rebuild when the time comes. Being that I live in the USA, the highway speed average here is about 70 mph (112 km/h). Now with that being said, would you recommend the -9, -5, or what a lot of japan shops have pushing me towards is the HKS 2530 KAI. They seem to swear by them being the best turbo. The 2530 kai has thrown a bone in the choice for me. They are supposed to spool a little bit faster than older model, yet also produce more hp. I can't find much info at all on these turbo's. But I just thought I would bring it up here.

At first I was dead set on the -9. But if the KAI can spool yet even quicker than -5 and produce more top end, then why not just go with them? Keep in mind that this is a weekend/nice weather/fun car only. It may see some track days, some 1/4 mile, some highway pulls, and some spirited driving. It's just an all round street car that can be fun where ever I want, when I want and give my buddies a good shock . The consensus of this thread points towards the -5 for that kind of scenario. But, since I plan on keeping the motor OEM for now, I don't want to rev the living dog piss out of it. Which I think the -5's would require that no? I don't want to have to stress the OEM valve train so to speak with a super high power band (7k on stock valve train good?). I guess I could always short shift if I had to(losing power band), or maybe I'm just over thinking it? Are the 2530 kai or -5 a plausible choice? They leave me room to grow if I get that boost bug bite after a rebuild also. I know the KAI's are a bit more expensive than either of the -5, -9 choice. But is it a good "in between" to kind of squash the whole -9 or -5 debate?

Here is what I have currently pieced together for supporting mods so far.

Raw Brokerage fuel kit with ID 1000cc injectors, fuel lab FPR, proper fittings/braided hoses etc.

http://www.rawbrokerage.com/raw-brokerage-injector-dynamics-pro-fuel-rail-combo-rb26/

Tomei Adjustable cam gears

Power FC L-jetro (will probably go to haltech platinum pro when I rebuild the motor), I already have the PFC, might as well use it.

Currently having a price quote for Midori Seibi dump pipes, midori titanium 90MM front pipes, 90mm straight pipe, and the midori high power NR titanium 90mm exhaust.

There are a few more things I know I need (boost controller, nismo AFM's, nismo fuel pump, nismo twin disc coppermix). Just wondering if the slightly "laggier" -5/2530 can be made a little less laggy with proper choice of supporting mods? I plan on keeping the intake system stock. Am trying to keep the engine bay in a stock like appearance.

Thanks for any advice. Very nice forum you guys have here.

[Hadouken]

Ultimately you should tell us what is your power goal. rwhp...

Also you should consider a map based ecu.

There are better things than power fc out there.

Oh and go the -9's

[gtr jet]

I'm pretty sure JTCC mentioned he only wanted around 450hp in another post so the -9s should be fine for that.

Unless you're looking for more power in the future I wouldn't bother going bigger than a -9.

[infamous_t]

I've recently gone from 34R stockers (-7 size for your ref) to -5s + poncam B's and don't consider it laggy at all, but I explicitly requested that when setting up the cams.

Has great mid + top end, bottom end is much the same as the 34 turbos, e85 makes a big difference in the low/mid end torque.

It's a bog standard 160K old motor with the only internal change being the cams.

[JTCC]

yea for right now, with a unopened engine, I think I would be wanting 450 max. Seems like a safe number. After a rebuild for sure would probably want to bump it up into 500-550 hp range. I guess I could always just go -9 and when the time comes, get some new snails. It's just selling off extra r32 parts probably isn't as easy in the USA as it is over in australia lol. But ya never know. I can't tell how the market will be since these cars haven't been legal for importation that long.

[JTCC]

I've recently gone from 34R stockers (-7 size for your ref) to -5s + poncam B's and don't consider it laggy at all, but I explicitly requested that when setting up the cams.

Has great mid + top end, bottom end is much the same as the 34 turbos, e85 makes a big difference in the low/mid end torque.

It's a bog standard 160K old motor with the only internal change being the cams.

That is good to hear. But e85 is hard to find around me. I think the closest gas station with e85 is about a 30 minute drive from my residence.

[gtr jet]

Maybe just have a look through the RB26 dyno thread and have a look when all the turbo's make power and make your mind up from there.

I wouldn't say -5s are extremely laggy for the street but if you don't want to wait for that extra 500-1000rpm or so to spin up the -9s are the way to go.

[JTCC]

Maybe just have a look through the RB26 dyno thread and have a look when all the turbo's make power and make your mind up from there.

I wouldn't say -5s are extremely laggy for the street but if you don't want to wait for that extra 500-1000rpm or so to spin up the -9s are the way to go.

Yea I've been looking around. That thread is huge also haha. I guess I'm just more worried about what others have been talking about that the dyno doesn't show. Feel while actually driving. I'll probably just go the dash -9's. Screw it, sometimes you have just bite the bullet and see where it gets you. If you are not satisfied then spend more money and go up a size. It's just money right lol. I more so made my initial post to bring up the 2530 kai since I cant really seem to find out to much about them and they seem to be right in the middle of this -9 or -5 option. I'm sure any choice will put a smile on my face realistically.

[gtr jet]

I don't think the HKS gear is too popular in Aus as it's old tech but still expensive. There are better, cheaper options out there these days. Maybe try something custom from Hypergear if you're willing to go that way.

[XGTRX]

Best thing to do is go for a drive in a responsive car and a laggier car. Doesnt matter what car. And work out what you prefer and then you have your answer. Go to a jdm meet or something and I am sure someone would be happy to take you for a drive. This is the best way to choose you prefered setup.

[JTCC]

Think I'll just do the -9. Seems like the only complaint with them is "linear power is boring". Oh darn lol. Being that I am away from home for nearly 10 months out the year, I'm sure anytime in that car will be impressive to me rather than my daily turbo diesel truck. When I do rebuild, I plan on going up in displacement. So I will just get new turbos then. Hopefully not for a couple of years. Just depends on stock engine life.