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hi

i have and r32 gtr and have done a few searches and cant quite find what im after

i would like like to know know some answers to the following questions in ur experiences

im talking fairly std cars, u know just the basics exhuast, ecu, injectors, pods and maybe a set of pon cams

now what i would really like to know is using the gtss, gtrs and the 2530

1)at what rpm can i expect to see boost starting to build,

2)at what rpm can i expect to see 1bar of boost

3)what power should i expect to see at 1bar of boost with each turbo set up

any info u can provide will be very helpful and appreciated

thanx brett

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all of the mentioned combo's are in the RB26 turbo upgrade thread at the top of the forced induction section

so you can just browse through dyno graphs and see

boost means nothing, its airflow thats useful. 1 bar on a gtss and 1 bar on a 2530 are not the same thing

i understand they will all give diffrent results, hence y i asked the question

but i dont want to use 1.4bar of boost like most off the ppl in the dyno sheet section

and ive check the that section and most ppl just tell u how much power they made on the max boost setting

id like to know more about response and how much power i can expect at 1bar, not the hightest power figure these turbocharges can make

thanx brett

Well that begs the question... would you use those turbos then?

If your not going to run boost, and put the turbos into where they belong.

Your better off with stock turbos & steel wheels put into them IMO.

You'll get better response than any of them

2 resons really,

i dont want to spend money on the same thing twice

and i have no intention of keeping them at 1 bar for long

i used 1 bar as a good base line so that all the answers r using the same about of boost (even playing ground)

and i dont get answers of i got 400kw out of a 2530 using 2bar of boost and the next guy got 300 out of a gtrs using 1bar

to me that is not a caparison, coz the situations r no where near the same

Edited by r32-25t

Well use a bit of logic here then shall we :)

Have a look at peoples graphs.

A lot have a boost reference, and then from that you can workout at what RPM, the given level of boost is being made :w00t:

Its going to be pretty much the same spot regardless of wether peak boost is another 6psi down the line.

So it covers everything apart from the power question @ 1bar...

And to that, you'll have a rough idea looking at the other graphs anyhow. And for the most part, it wont be a lot!

Unfortunately your asking a very uncommon question. Most people put the turbos on to run them at thier point, or near enough to it.

So you gonna have to read into the results a little more on this one as the answers wont be plentiful.

im sure there wont be a heap of ppl who will have the answers to my question

but there might be some ppl with just enough info to help me get closer to what id like to know

my theory was u will never know til u ask the question, so i thought id ask the question and see where luck may take me

i just didnt expect to get flamed like this

Okay I to am hoping not to get to heavily flamed, and have looked at the stickys etc.

Am considering a set of either gt-ss or 2860 garrets and have noticed and read on here that HKS turbos need higher boost levels to be in their peak efficency than the garrett equivalents with garretts happier at 18ish psi HKS not till more like 20-24psi results stickyed seem to confirm this but alot of the links to dyno sheets seem to be not working, maybe due to the hosting issues SAU is having, i dunno.

Can anyone confirm or deny this, I am sure others have posted similar findings just wanted to see if others agree and this thread seemed like a good place to pose the question.

I have an unopened 100,000 k motor well maintained good nick etc. and am more comfortable running 18psi rather than 20-24psi I had gt-ss at the top of my list as I am looking totally for response but garrets seem to offer the posibility for more further down the track maybe after I have rebuilt the bottom end new head gasket oil control mods etc without having to run high boost to get resonable numbers in the meantime.

any comments?

Edited by noone

Maybe what he is asking for is how can I have it a little better than it is now but don't want to lose much if any low down squirt .

If this is the case it could be worth looking at the best factory offering (for road) which I suppose would be R34 type ball bearing turbos . Other than that if there's money to be spent on an internally std engine with mild cams most really like the HKS GT-SS turbos .

I find people buy early GTR's and don't like what they think is peaky power delivery compared to N/A cars with a few more cubic inches . I could launch into a long spiel about GT28 BB turbos but all been said in the past along with many conflicting opinions .

Cruiseliner has a long development string in here somewhere about his GTR and his HKS GT-SS turbos , with the mild mods he did he said the results were brilliant for what he used the car for - road from memmory . I'd PM him .

Cheers A .

but alot of the links to dyno sheets seem to be not working, maybe due to the hosting issues SAU is having, i dunno.

Ye, thats a problem :blush:

Some of the stuff is missing, and some of the stuff people host on thier own servers.

Then link them... but they might delete that file down the track and then its gone for good once they sell thier car or something.

It is a shame as people cant leave DYNO sheets up or whateva, stickys is still a good resource though. :)

R31Nismoid I believe u r going to go GTSS ,from what I have read. Do you mind commenting on roughly what boost u plan to run, do you think HKS need a little more to be in their sweet spot than Garrett's or is there too many other variables to make such a sweeping statement. Keep coming back to the fact GTSS appear to be so responsive down low and since I wont be using monster revs, at least initially, maybe that is better for me, being able to push harder further down the track would be nice though too thinking 2860 -5 vs -7 2530 vs gtss really I guess.

DAMN hard to decide :laugh:

Ye, they were a great item.

A good idea i can reccomend is to PM the people. Even though they might not be hosting them, they might still have them on thier PC's.

Thats probably the best offering i can to counter two problems with upgrading and people pulling them off servers :)

Im planning on using GT-SS, and... whatever boost i can run.

If i can run 24psi without a problem i'll do it. Im pushing them as far as they will go. Soon as they stop making power, or i have any other issue with the boost, we will stop :laugh:

I plan to try a few different types of cams, and all sorts of stuff mainly for R&D, and for the good of the forum people trying to get the most from GT-SS, as i plan to try do just that and find the best combo of parts.

If you want a street GTR, especially being a 32. Its GT-SS all the way IMO.

Look for ferni's results, he has a setup almost identical to what i will have,

i'm running GT2530's on a stock engine, full boost (1.1 bar) is at 4400rpm. But I have cam gears and Trust dump/front pipes.

I've had this on the track, and I find it quite responsive, but I havn't been in a car with GT-SS's.

My dyno sheet should be near the end of the rb26 thread. http://www.skylinesaustralia.com/forums/in...t&p=2920655

Edited by sav man
hi

i have and r32 gtr and have done a few searches and cant quite find what im after

i would like like to know know some answers to the following questions in ur experiences

im talking fairly std cars, u know just the basics exhuast, ecu, injectors, pods and maybe a set of pon cams

now what i would really like to know is using the gtss, gtrs and the 2530

1)at what rpm can i expect to see boost starting to build,

GT-SS & 2530 or the -5's: 1600 TO 1800 RPM

2)at what rpm can i expect to see 1bar of boost

GT-SS 3600 rpm with poncams, 2530's or the -5's by 3800rpm

3)what power should i expect to see at 1bar of boost with each turbo set up

GT-SS 250kw with cams, 2530 or the -5's 280 to 290kw with cams

any info u can provide will be very helpful and appreciated

thanx brett

With the "RS" I'm not sure but judging by their specs a bit more laggy, a bit more power :)

Edited by The Alchemist
Okay I to am hoping not to get to heavily flamed, and have looked at the stickys etc.

Am considering a set of either gt-ss or 2860 garrets and have noticed and read on here that HKS turbos need higher boost levels to be in their peak efficency than the garrett equivalents with garretts happier at 18ish psi HKS not till more like 20-24psi results stickyed seem to confirm this but alot of the links to dyno sheets seem to be not working, maybe due to the hosting issues SAU is having, i dunno.

Can anyone confirm or deny this, I am sure others have posted similar findings just wanted to see if others agree and this thread seemed like a good place to pose the question.

I have an unopened 100,000 k motor well maintained good nick etc. and am more comfortable running 18psi rather than 20-24psi I had gt-ss at the top of my list as I am looking totally for response but garrets seem to offer the possibility for more further down the track maybe after I have rebuilt the bottom end new head gasket oil control mods etc without having to run high boost to get resonable numbers in the meantime.

any comments?

Having run both turboes, the GT-SS and the Garrett -5's (2530's) and can safely say that the -5's are the better turbo ..... for me :)

I can supply this thread with a direct comparo on the exact same engine combo with the only changes being the turboes to show the differences in boost response, torque and outright power produced by each. Only 3000km engine time separates the comparison. Upgraded "cos I can" and felt their was more to life than 290 rwkw :)

Interested?

Regards the efficiency arguements, both turboes are happier at 18 to 20 psi rather than 14psi when run on the wastegates. This is evident by the large jump in power when you cross over the 17psi threshold eg: with the -5's 311kw at 17psi but a massive 365kw at 19psi. Also the boost seems to hold steadier at the higher boost levels. This is not a bad thing though and tuned correctly should not be a problem with a std GTR.

At this power level I found the difference academic with regards to the power you could actually use on the road or track with 1st and 2nd gear losing all traction in the dry with 4WD and 3rd gear just holding, 4th gear is insane.

Both are very good turbo combo's on a standard GTR but with Tomei cams fitted they become outstanding!!

Both reach 17psi , with cams, at 4000rpm but the 2560 -5's walk away in the top end. This is with cams dialled in correctly and time spent tuning for good response etc etc. This only difference I found was a 20kw better top end and a bit more overall torque with the -5's which is very noticible on the road.

Hope this Helps,

Mike

And "yes" the number plates are different for those observent people out there but they are personalized plates on the same car :)

post-11110-1176334086.gif

post-11110-1176334110.gif

Edited by The Alchemist

wow, thats a good post with good info from a person who can comment on both sides

i didnt think the GT-SSs could stay with the -5s so close, unless you mean the 20kw difference was the before and after cams with the -5s?

surprising is an understatement

go you little GT-SSs haha

For those interested, I was running HKS GT-SS's on a built engine and have recently changed to HKS GT-RS's

I will see if I have time to photograph the dyno sheets for both setups and post them up.

I was making around ~315awkw at 20psi with the GT-SS's and Tomei Poncam Type B's, and at around the same boost I now make around 360awkw with the same cams - a little sacrifice in terms of a response but a massive kick in the ass when the fun starts :)

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