Hks Gt-Ss Just Off The Dyno At 560 Rwhp

[sirimport]

Well i just got my car off the dyno yesterday and i was really happy with my results.

I hit 560 rwhp at 1.5 bar...

Im really happy with the numbers and the power band it great...

fast spool and pulls hard all the way to the top...

I was alittle worried about how the turbos would preform because i put in the HKS GT-SS from a S13/S14 not the ones for the GTR

My tuner suggested this because the S13/S14 HKS GT-SS are larger than the GTR GT-SS but wont lag as much as the GT-RS

Well all i can say 560 at the wheels at 1.5 is what i was aiming for...

[R31Nismoid]

Got a dyno sheet with RPM/power & rpm/boost etc?

Although you could have done that with Garrett -5s like we said, & saved quite a bit of money.

Just a question of what is/isnt more responsive outta the two

Plus GT-RS are a big, big turbo and capable of more than what you made, so stands to reason they would be laggier.

[Piggaz]

A bit of mucking around to get the SR20 versions to fit?

Stroker crank?

[Don Dada]

Got a dyno sheet with RPM/power & rpm/boost etc?

[Count Grantleyish]

^^^ +243755937546584657464823764727097864267826228465763828

Be interesting to see the graph.

[GTScotT]

I think we'd all be keen to see these results..

I doubt there is some dirty trick to magic turbos on the GTR lol.

[R31Nismoid]

I'm guessing they are laggier than a -5, so similar to a 2530 setup.

Also can't remember if he is 2.6 or not

[sirimport]

yeah i got the dyno.... ill put it up tomorrow... i got to find my scanner in the boxes in my garage haha

i got a stock bottom end and there was alittle machine work done to the turbos.. mostly for flow....

as for cost i got the two turbos for 1100 a piece so 2200 for two ... machined and all

the reason i went with the HKS was because my tuner claimed i could get better numbers and response with the HKS setup at around the same price... so i was like go for it

i was worried at first if they were genuine HKS but when i was dynoing the HKS rep guy was there.. so at that point i know they were real...

well ill post up the chart tomorrow until then

[discopotato03]

Thats because Garrett Japan make genuine Garrett turbos for HKS . The SR20 spec GTSS is literally an S15 specc BB GT2560R with the NS111 turbine substituted , actually HKS fit their own turbine housing but its the same AR as Garretts one and made of a similar/same high temp spec material .

A .

[bigmikespec]

I'm guessing they are laggier than a -5, so similar to a 2530 setup.

Also can't remember if he is 2.6 or not

Don't see how they can be laggier if they have smaller wheels than -5's.

[R31Nismoid]

He said they were modified, so who knows whats exactly gone on.

Also there is no way a "GT-SS" combo will make 400rwkw for a start. So... Have to wait for the further info

[Beer Baron]

420kw atw with a pair of GTSS? I don't like to be a sceptic but I doubt it. having said that japanese dynos are highly optimistic. when we put berrys car on a dyno in japan back in 07 it made 1000hp!! in aus it was about 400kw.

[NickR33]

sort of OTT but...

just out of interest what's the most anyone has got out of a set of GTSS? if you shoved as much air down their throat as they could handle would 350rwkw be possible?

[R31Nismoid]

I think someone did 360rwkw with something around 28psi, only one result though, clearly outta the comfort zone for them

[Beer Baron]

sort of OTT but...

just out of interest what's the most anyone has got out of a set of GTSS? if you shoved as much air down their throat as they could handle would 350rwkw be possible?

I was going to try on my car.

big tomei manis (cost some response but hey there's already plenty of that)

the big tomei dumps (allow as much flow in and out)

BIG twin 70mm front pipes into 90mm exhaust with no restrictions

trust hard pipe kit (and full intercooler pipe kit)

ARC intercooler

match ported plenumn

match ported throttles/spacer

head ported for more flow at the expense of a little response (but not an outright laggy drag type head)

valve springs to enable more revs

cams 260degree 9.15mm in and ex

everything match ported (turbo outlet to pipe inlet, turbo flange to mani flange etc etc etc EVERYTHING match ported)

built N1 Nur engine and 1.2mm tomei head gasket (built to handle 30psi)

I was hoping for 350kw with them absolutely having their necks rung at 2bar. the real question was if they'd still be flowing well at 2bar and what EGT and inlet temps would be like (that's what would dictate max boost. once in temp and egt skyrocket there's no point winding in more boost as you just don't get much more power). I'm sure they'd have handled 25psi fine, but not sure if they'd run with 30psi. but with all the airflow mods etc it would have had the best possible chance.

the fact is though they are really a 300-330kw atw set-up.

[GTScotT]

The SR20 spec GTSS is literally an S15 specc BB GT2560R with the NS111 turbine substituted , actually HKS fit their own turbine housing but its the same AR as Garretts one and made of a similar/same high temp spec material .

That is very interesting, a turbine wheel swap.. Could you tell us what the NS111 turbine is native to and if the T28 compressor and cover was retained?

I am soon to be an SR20 boy again

EDIT: Just read a post from you on SR20 forum in 2004 that confirms the NS111 is the Disco (2860rs) and GTRS (2871) turbine.

Thus if these results are accurate we could replicate them with the NS111 wheel and whatever compressor is in the original S15BB turbo.. Interesting read for all I'm sure.. Magic combo LOL

[DVS JEZ]

Trader

Did u find the dyno sheet or video of the run.

[discopotato03]

The NS111 turbine is the one you see when the turbo specs say 53.8mm 76 trim GT28 turbine .

Its native in GT2530/GT2535/GT2540/SR spec GTSS/GT2860RS/all GT2871Rs inc GTRS . There's even an absoulute dog version having this turbine driving the 76mm 48 comp trim wheel called GT2876R .

The 62 trim version of this NS111 turbine is what you get in GT2854R and the 707160-9/RB26 spec GTSS .

When you see GT28 turbine size specs as "53.0mm" 62 trim thats the one you get in turbos like GT2554R and GT2560R which is what SR20DETs get in either plain or ball bearings - the "R" on the end means rolling element ball bearings . I think they are actually a TB25 turbine that was carried over to the lower end of Garretts GTBB turbo family .

Its interesting that the OE R34 Garrett BB turbos are a unique GT2556R , not something I've looked into and possibly with a ceramic turbine ? Not sure there .

You do get some say in the compressor housings on GTR turbos and I'm not 100% certain where the changeover is from T25 to T3 to T4 . I do know the smallest ones go directly on the cartridge without an adapter ring and its these ones that the small AR ratio ones ie 0.42 . The 0.60 AR ones are more likely to be restyled T04B ones to suit an RB26DETT . Another give away is the way the wastegate actuators are mounted on the compressor end I think being from behind or in front of the comp housing .

BTW these SR spec GT2860R/GTSS turbos use cartridge number 446179-53 which is also used in the Ssayong Musso spec GT"2854R" , and why its called that I think is because its in Mercedes diesel spec GT2854R housings . I'll find the turbo number and post it up .

Bottom line is if that cartridge is freely available it'd be easier to buy it than build it .

A .

That Garrett Musso turbo number is 735554-2 .

Edited July 13, 2011 by discopotato03

[GTScotT]

BTW these SR spec GT2860R/GTSS turbos use cartridge number 446179-53 which is also used in the Ssayong Musso spec GT"2854R" , and why its called that I think is because its in Mercedes diesel spec GT2854R housings . I'll find the turbo number and post it up .

Bottom line is if that cartridge is freely available it'd be easier to buy it than build it .

A .

That Garrett Musso turbo number is 735554-2 .

Awesome! Cant wait to see the dyno sheet.

[UNR33L]

So about that dyno sheet..