HKS GT2535 RB25 S13

Post by **Cameron** » Mon Dec 15, 2008 7:57 pm

Hey guys its been a while... Ive had a change of heart for power, and for what i want to do with my car, it was going to be a drag racer, aiming for high power and what not, but now its going to be a drift car. Anyways, right now i have a GT30, and i dont need, nor want as much power as that thing produces, so what i was thinking was just downgrading (i use that term lightly) to a HKS GT2535. I realize these are T25's and are T2, but they are good for about the power I want, HKS rates them at 350BHP, but with HKS turbo's from what ive read on the australian skyline forums there BHP ratings are more closer to their wheel horse power ratings anyways.. So what im asking is there anyone with a 25 that is running a 2535, and i know i would have to get a T3 to T2 Adapter, and should i have any problem with clearance issues on this? other than having to redo exhaust Downpiping? Chassis is an S13.

Please let me know, also please leave negative, "low power on an RB25 is $hit" or anything of the like out of here, i know what i want, and for drifting, around 350whp with a madly responsive turbo is just fine.

Thanks, Cameron.

Modified by Cameron at 3:42 PM 12/24/2008

Post by **Cameron** » Tue Dec 16, 2008 6:06 am

bump, i really need to know. thanks.

Post by **eh?** » Tue Dec 16, 2008 6:18 am

I don't think you'll find anyone who would do that but why not consider a stock RB25 turbo? 13 or so psi, cams and a very good tune will probably get you there or close.

Post by **Cameron** » Tue Dec 16, 2008 6:22 am

cause 13psi is pushing it, i dont want to constantly be running the turbo at its max. i just got done talking to a dude that put down 397 at 21psi with one of these things. just want to hear your experiences.

Post by **silviasgp06** » Tue Dec 16, 2008 6:30 am

SAU has tons of info,

Post by **WhatsADSM** » Tue Dec 16, 2008 6:40 am

2871r is a great option as well. It will do ~400whp and spool extremely quickly. It is t3 flanged.

Post by **Sil240** » Tue Dec 16, 2008 7:57 am

Yeah if I were you unless you already have that turbo in your hands, I would get a T3 flange based turbo.

I'm sure there is a T3 based turbo that might have similar flow characteristics.Check out HKS' site of Garrett's

Post by **ANVIL** » Tue Dec 16, 2008 8:06 am

maybe u should reconsider the stock turbo. with bigger injectors and a tune, you can easily see over 300whp.

see if thats to your liking, and if not, you can always upgrade the turbo and already have bigger injectors to support it

Post by **Cameron** » Tue Dec 16, 2008 9:16 am

thanks for the opinions guys, but like i said, i didnt want this to be an opionionative thread about going with other turbos, i just wanted info on other people with RB's running this setup, whether its RB20 dudes or RB25 dudes. i have read a lot on a lot of the aussie forums, and have got a lot of info, but my main concern is clearance issues using a flange adaptor. Oh btw the guy im talking to is going to trade me his turbo plus cash for my GT30, so imo its a good deal.

And like i said also, i do not want to run an stock 25 turbo, because at 13psi yielding about 300whp its pretty much at its limits..

also if you read, i talked to a dude who put down 397 at 21psi with one of these, so I wouldnt underestimate them.

if only i could find a GT2540 (which are T3) but i dont have time to look, nor will i find one for a cheap price most likely. plus ill be getting money on my end so why not?

Post by **DriftingisLame** » Tue Dec 16, 2008 1:32 pm

Just for the record, HKS made kits for the rb20 and 25's with skyline specific GT2530's and GT2535's (t3 flanged). It seems no australian in the world likes any amount of lag, as this seems to be the most common turbo upgrade on SAU. Check there for results and ask around where they got their turbo's.

They have rb20/25/26 dyno threads on there and I guarantee you'll find a ton of people running the 2530/35 with the exact same power characteristics that you're after.

Post by **Cameron** » Tue Dec 16, 2008 1:51 pm

yea man ive pretty much decided on this turbo, and also it is a .86 A/R (T25) which would be the equivalent of about .64 A/R on a T3 housing. my main Concern is running an Adapter to convert from T3 to T2, i mean i know people do it all the time, and i dont think i would create too much backpressure on the T25 since it is such a high AR. thats the question im asking here, i got all the info i need on it, and i realize they also come in T3. my main question is, is there a problem running a T2 on a 25, considering the turbo is .86 AR...

Post by **Cameron** » Tue Dec 16, 2008 6:20 pm

one more bump, im about to make the trade tomorrow. just answer my question, it doesnt really pertain to the turbo itself, just asking is there anything wrong with going from T3 to T2 considering the T2 housing is pretty high A/R comparable to .64 AR in a T3 Housing..

Post by **Sil240** » Wed Dec 17, 2008 4:30 am

YES!!!Think about it you have the stock manifold with a 4"x3" (#'s are made up) hole in it.Now put a block of plate on it that it 3"x2".

1- Your going to have crappy flow coming out of your mani.

2- Your going to be building up a lot of heat on that flange. (instead of the hot exhaust gas just passing by the flange its slamming into it, creating turbulence)

I wouldn't do it.If you Absolutely Positively HAD to use a T2 flange.Then I would get a wastegate adapter, which has a T3 flange on the mani side and a T2 flang on the Turbo side.But make it with a gradual taper down, instead of and abrupt change in size.Plus you can then run a External Gate.

Why don't you just sell your GT30R and get the right turbo you want??

That extra $$ you'll be getting from your trade your gonna be spending making your T2 flange work. I'm sure you can get some good $ for your GT30R

Post by **Cameron** » Wed Dec 17, 2008 2:03 pm

the adapter im looking at is a gradual taper down from t3 to t2...

hell its made my garrett, it has to have some technology behind it..

http://cgi.ebay.com/Garrett-Tu...l1116

dont think it should be that big of a deal..

I guess i didnt make my self clear when i thought i did, or maybe i did but you just didnt read, i have no intentions of hacking off the t3 flange and welding a t2 flange onto the RB25 Manifold! LMAO

Post by **Cameron** » Wed Dec 17, 2008 3:03 pm

hey guys, i think i have figured out what im going to do...

The 2535's Turbine is: Wheel- 76 Trim - 53.8 Major / 47.0 Exducer

i looked on ATPtuning's website and they sell garrett turbine housings..

They have a T3 housing on there for 76 trim turbines

here is the link.

http://www.atpturbo.com/Mercha...e=HSG

they come in .48 AR (hell no) .63 AR, and .82 AR

i would think since the Turbine on the 2535 is a 76 trim turbine, that the 76 trim Housing would work. am i correct on this?

if this will work i will definitely go this route, if not, i have no problem running a turbo adapter.

Post by **Coolwhip** » Wed Dec 17, 2008 3:22 pm

http://www.turbobygarrett.com/....html

Guess they have been injecting that stuff for awhile now huh Cam.

lol

Post by **Sil240** » Wed Dec 17, 2008 3:28 pm

There you go!!!Thats the proper solution to your problem.I didn't even think of that.Just make sure that housing will work with your wheel.

How much more $$ is this guy gonna give you for your GT30??? I hope it covers the cost plus shipping of this turbine housing.

If not just sell your turbo and get the proper one.

I still am not a fan of that adapter, but if it works. COOL!!

Go for the new turbine housing!!!!!Not the adapter.

Good luck with the car!!

Post by **Cameron** » Wed Dec 17, 2008 3:33 pm

haha ricky, yea, chicken is good.

and sil40. we are both in the Same city so no shipping is necessary. the Housing is what 180 bucks? and i can sell the housing off of the turbo im trading for, for about 300 so I will be fine. and it should be fine because of all the turbos i have looked at with a 53.8mm wheel, they are 76 trim, as well as the HKS turbo..

hes giving me 200 on top. mine is just a AMS GT33..

Post by **Coolwhip** » Wed Dec 17, 2008 3:53 pm

a customer of mine went this route... off the turbine housing for his wastegate...

Post by **Cameron** » Wed Dec 17, 2008 4:14 pm

hmm ill see what all is involved. if not ill just tap the factory exhaust manifold.

Post by **Cameron** » Thu Dec 18, 2008 9:12 am

Just traded turbos with him, and im about to buy a T3 Garrett 76 trim turbine housing.

As far as AR on the housing im about to buy goes, im leaning toward the .64 AR, .82 AR might be a little too big for this turbo.

this little turbo should be fun..

Post by **ANVIL** » Thu Dec 18, 2008 2:38 pm

what ever happend to your holset setup? are u still using that apex manifold?

Post by **Cameron** » Wed Dec 24, 2008 10:38 am

ive still got it, its for sale, want to buy it?

Oh and so i tracked down the original owner of the turbo (3 owners before me), called him up and asked him if he had any t3 housings that would fit it, and it just so happens that he had The original HKS Housing that it came with, T3 flanged, .64 AR that was made for an RB since it had the 6 bolt flange for the dump pipe, he just put the T25 housing on there because he the next guy he sold it to was going to use it on an SR. so i ended up getting it for 40 bucks, so i am excited!

So now i have a t25 housing that will fit 2871's and all of the different variations of that size turbo. 2876, 28RS. so i might try selling it to an SR person seeing it is a .86 AR housing and someone may want to upgrade from a .64

HKS GT2535 RB25 S13

HKS GT2535 RB25 S13

Re: HKS GT2535 RB25 S13 (Cameron)

Re: (eh?)

Re: (Cameron)

Re: (ANVIL)

Re: (DriftingisLame)

Re: (Cameron)

Re: (Sil240)

Re: (Cameron)

Re: (Sil240)

Re: (Coolwhip)

Re: (Cameron)

Re: (ANVIL)

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