Thoughts on GT-SS TURBOS

[MELV]

has anyone ever bought or heard about the GT-SS turbos ?

I heard they can handle 1.6bar without pushing them.

i was thinking of changing from my R34 N1 turbos to GT-SS

they would come on boost much much faster.

And my N1's are running 1.4bar and not sure if i can push them further.

any suggestions ?

[The Alchemist]

I've just bought a set from Nengan.com plus matching dumps......haven't installed them yet but I based my decision to buy them on a number of things:

1: wanting to keep bottom end standard for now

2: ideal match for a set of mild Tomei cams already installed

3:almost zero lagg through redesigned housings and compressor wheel, increased efficiency without loss of top end response. Lastest turbo technology, remember the 2530's are 8 years old now and haven't changed in their design.

4: Have heard/read of 14 PSI by 3200rpm on UK forums......beat that with a set of N1's

5: with my current setup almost 300kw at the wheels guaranteed....did I mention 300kw with NO LAG...

6: Only mild fueling upgrade necessary, in tank pump and 700cc injectors....

7: road going car so overall response of the setup is paramount

hope this helps

[Merli]

I don't think the GT-SS will still be efficient at 1.6 Bar... I can tell you for sure in about a month's time...

I personally wouldn't change from R34 N1s to GT-SS... You've already got awesome turbos!

[jezzrrr]

fromm what Ive read I agree with Merli, your turbos are very similar to gtss

[MELV]

true,

they take a while to hit boost

sounds great while u wait tho HUGE SUCKING SOUND !!

i dont know if i want to go GT-SS or go bigger

[benjiman74]

I personally wouldn't change from R34 N1s to GT-SS... You've already got awesome turbos!

I am eager to see the results when your car is fired up with the gtss's, response should be awesome. If the abovementioned spool up info is correct and they can make 1 bar at 3,200 rpm thats about 1500 less than the r34 n1's. If you want that meat under the curve while making similar peak power then wouldn't they be a wothwhile upgrade?

[Merli]

I am eager to see the results when your car is fired up with the gtss's, response should be awesome. If the abovementioned spool up info is correct and they can make 1 bar at 3,200 rpm thats about 1500 less than the r34 n1's. If you want that meat under the curve while making similar peak power then wouldn't they be a wothwhile upgrade?

I still haven't seen or heard concrete results from these GT-SS Turbos. Everything has been hearsay. I don't even know if they'll make 300awkw!!!

If they can make 1 Bar by 3200rpm, and crack 300awkw, I'll be EXTREMELY impressed.

Time will tell, gimme about a month

[lwells]

Merli: I thought you were going GT-RS's.. hmmm

/me continues the hunt for the perfect "response" turbo.

LW.

[benjiman74]

I still haven't seen or heard concrete results from these GT-SS Turbos. Everything has been hearsay. I don't even know if they'll make 300awkw!!!

If they can make 1 Bar by 3200rpm, and crack 300awkw, I'll be EXTREMELY impressed.

Time will tell, gimme about a month

I haven't heard of the n1's making 300awkw so if you can achieve that then in theory the gtss's should not only make boost earlier but produce more peak than the n1's. We'll just have to wait to find out how good these babies are, although i suspect you've done your homework and know what to expect...

[Merli]

Merli: I thought you were going GT-RS's.. hmmm

/me continues the hunt for the perfect "response" turbo.

LW.

NOOOOOOOOOOOOOO!!!!

I don't want a lag monster! GT-RS turbos are only suitable for RB28 or RB30 engines, not standard capacity RB26s... They're more of a drag setup, capable of 800hp.

I want response response response! I don't care about peak power, I want a nice fat torque curve and did I mention response?

[TIMMMAYYY]

You sound like SydneyKid. Its not about how much power you make, its where you make it.

[The Alchemist]

well I'm very satisfied I've done my homework! These turboes DO make 300kw at the wheels with cams and the Do crack 14 PSI at 3200rpm. I don't think you can beat that on a road going car with N1's. Like the guy said its about where you make the power not how much you make

[Sydneykid]

Hi guys, I don't understand this maniacal concentration on boost levels. Airflow makes power not boost, boost is simply a measure of resistance to airflow. The idea is to increase the airflow, I really don't give a rat's what happens to the boost. :talk2hand

An example, by fitting longer duration, higher lift cams in an engine you have lowered the resistance, therefore lowered the boost at the same airflow. Ditto upgraded dump, engine pipe, exhaust, air filter, porting etc etc. The answer is not how much boost you make at ~3,500 rpm, but how much power you make at ~3,500 rpm.

To elaborate, by improving the airflow I could have more power at ~3,500 rpm using 2530's in one engine but have less boost than another engine with standard airflow (resistance) and GTSS's. Does that mean the 2530's are not as responsive as the GTSS's?

I don't think so Tim!

[benjiman74]

Excuse my ignorance Sk but with SOP feel theres not much happening until the boost guage starts rising. Using an extreme example, if you were to fit high lift cams and port the head enabling greater airflow then fit a monster turbo that's not spooling till 6,000 rpm how can power at lower revs be greater, sure the head can potentially flow more but whats pushin the air/fuel through?

[Merli]

Why must you always treat everyone as if they were of inferior intellect?

That is extremely elementary physics and flow dynamics, and I'm sure everyone realises that boost is just a measure of engine resistance to airflow.

But that is the accepted way of measuring what the turbos are doing, as not everyone is fluent in CFM of airflow or RPM of turbo shaft speed

Yes, not all psi are equal, but that's what we have to work with, and most engines in question are of stock heads and just exhaust upgrades and perhaps camshafts in the way of airflow upgrades.... Boost is a good general indication of turbo response, all other things being equal.

[Sydneykid]

Why must you always treat everyone as if they were of inferior intellect?

That is extremely elementary physics and flow dynamics, and I'm sure everyone realises that boost is just a measure of engine resistance to airflow.

But that is the accepted way of measuring what the turbos are doing, as not everyone is fluent in CFM of airflow or RPM of turbo shaft speed

Yes, not all psi are equal, but that's what we have to work with, and most engines in question are of stock heads and just exhaust upgrades and perhaps camshafts in the way of airflow upgrades.... Boost is a good general indication of turbo response, all other things being equal.

I understand where you are coming from Merli, but I think it is pretty obvious when you read this thread (and other current threads) that there are a number of people who think that more boost always = more power. There are plenty that know otherwise, maybe I am guilty of being the only one who says so or who says so too often. But it is hard to hold back when I am getting a bit sick of reading about BOOST BOOST BOOST all the time. :spew:

So I appologise if it seems as though I am preaching from some higher plain, but maybe it is worse if I just simply shut up and let the myths continue.

It's your call, tell me and I will stop

[Merli]

I can't tell you to stop, nor do I want you to... I'd just like you to know that just because we don't have brain dumps all the time, it doesn't mean that we don't know what goes on behind the surface "drivel" that we engage in

[MELV]

I haven't heard of the n1's making 300awkw

Mine does.

thats why im wondering how the GT-SS will change the way the car drives ?

will it make the same or more power on the dyno ? considering i could push the GT-SS further than the N1's.

and what would the diffrence be from GT-SS' to the 2530's ?

The motor is complete R34N1 spec.

im assuming there wouldnt be many over here in OZ with the same motor.

[The Alchemist]

what other mods are done to your cylinder head? N1's making 300kw sounds exceptional to say the least.....from what I have read about N1's......Anyway I am no turbo expert by any means but the difference between the GT-ss and the 2530's is eight years of development!

Imagine if we were still using computors that were eight years old in modern applications.

The GT-SS housings are different in their internal shape and the actual compressor/turbine fins are a different shape and a different number of them compared to the 2530's. This is what makes the differences in spool up time> aerodynamic efficiency is much better.

The reason why the 2530's make a bit more top end power ( and we're talking 30 kw or so at the wheels like big deal) is because the compressor trim is slightly larger than the GT-SS compressor trim.

Bottom line is that this is only useful right at the top end were most people do 5% of their driving right at the end of the "back straight"....out of the tight hair pin I know which turbo I'd want strapped to the side of my RB26 and it wouldn't be the 2530's. I have found many posts on the UK forums re: the HKS GT-SS turboes. Mark from Abbeymotorsport (HKS UK importer) over in the UK is a major fan of them and is one of the reasons they have gained quick popularity over there. He personally recommended them to me over the 2530's having tried them on many GTR's in back to back setups.

Hope this helps guys.....In a few months or so, time being the main factor I will post my results after their installation and you will be able to make up your own minds.

Mike

[ferni]

I like the stuff sk says, even if it is obvious to experts, like Merli, to me a newbie its helpful, I don't think his target audience was you when he replied. I'm guessing a majority of this forum didn't know what SK explained above.

keep it up SK!