The Ultimate Turbo for your RB25DET

[REDFC]

Laggy Ho :)

Oooops forgot i was on SAU, thought he was talking about a rotor

[INASNT]

i hope so! i think it all bolts up.  Kit comes with its own dump and all the lines. I think the one thing ill need is a new intake pipe as the compressor inlet mouth looks big, but im fairly sure its a blot on kit.

can someone with ~280rwkw comment on drivability? are these cars still fast at speeds below 100 or is it just wheelspin city?

While i love power, it makes you slower if you cant get it down!

Its very rare that on normal roads you open the car out to 7000rpm in every gear.

With the price of petrol these days i much prefer driving my gfriends car around day to day

[SLY33]

so how does it drive on those rare occasions? how much power do you have?

[INASNT]

so how does it drive on those rare occasions? how much power do you have?

bit over 300 at 20psi.

On the rare occasions i run at 20psi 1st is useless and second is a bit sideways and 3rd is lots of fun

[sweetr33]

300kw's is my power goal eventually also. Sounds like an awesome whack of power.,. As for bolt on turbo i have witnessed some TD06's on rb25's and they go well. IO have been in a r33 which had a HKS 3037s and microtech and cams etc and it made 350hp at wheels on 1 bar. Was rather quick but very wheelspiny. guess its personal choice on turbos.

[Trust33]

Would it be a better idea if i was to say put garret gt2535 on my car rb25det,with usual mods,with a different size ar.Here is a reply that i got from horsepower in a box.com

I can do the GT2535 in the T3 flange internal gated for $1750, but not the

GT2530.

We also do a 500hp core unit with a .70 comp cover for the RB25 as a bolt on

Internal gate for $2150.

Regards

Is this option a good one for this turbo and motor with stock internals looking at running cams?What sort of spooling rpm time could i expect it to come onto boost from the upgraded version?

[redline2003]

For me i feel 250RWKW is perfect for the street/circuit. Only problem is finding a turbo that will hit full boost at a low rpm(say 3500-4000) and make that amount of power as well, Because we all know bigger turbos=big power=lots of lag. I think to achieve 250RWKW with a little lag(compared with stock) you'd need cams, ported head and port matched inlet and exhaust ports. All these help reduce the lag and up the power too. In my opinion ball bearing and being water and oil cooled is a must for the longterm, plus the ball bearing aspect helps in cutting lag.

[INASNT]

Would it be a better idea if i was to say put garret gt2535 on my car rb25det,with usual mods,with a different size ar.Here is a reply that i got from horsepower in a box.com

I can do the GT2535 in the T3 flange internal gated for $1750, but not the

GT2530.

We also do a 500hp core unit with a .70 comp cover for the RB25 as a bolt on

Internal gate for $2150.

Regards

Is this option a good one for this turbo and motor with stock internals looking at running cams?What sort of spooling rpm time could i expect it to come onto boost from the upgraded version?

Only probelm with these type of turbos is that you will always have boost control problems and sureg problems when trying to pump out alot of hp from a internal gated turbo!!

[SLY33]

Only probelm with these type of turbos is that you will always have boost control problems and sureg problems when trying to pump out alot of hp from a internal gated turbo!!

is the reason being that in order to control boost pressure on a big turbo, an internal gate wont allow enough gas out to make the boost change needed?

[INASNT]

internal gate wont be able to bypass enough to stop boost control problems

[Trust33]

What size exhaust wheel does the 2535 run.It has a 56t compressor wheel..With the bigger .70 housing will this aid in the spool up or top end power as compared to the .64 housing.

[SLY33]

trust33, bear in mind that Garret GT25 series are not the same as HKS GT25 series. to duplicate the 250rwkw from a HKS GT2535 int gate youd need a Garret GT3040 int gate.

[SLY33]

trust33, bear in mind that Garret GT25 series are not the same as HKS GT25 series. for example to duplicate the ~250rwkw from a HKS GT2535 int gate youd need a Garret GT3040 int gate.

[INASNT]

A garrett GT30 series turbos are mainly external gated and will shit all over a hks 2535 for power output

[Cubes]

Peak power output? What about average power output?

Grepin's HKS2835ProS is made 287rwkw at the wheels.

Thats pretty damn impressive from such a responsive near stock feel turbo.

[INASNT]

I was saying a hks 2535 and a garrett Gt30 turbo are not comparable. When a 2535 starts running out of puff the GT30 will just be beginning to get into its efficiency zone.

what rpm does the 2835pros start making boost on a stock rb25?

[SLY33]

inasnt read properly. i said internal gate, and i said for example.

UAS have set up many internal gate Garret GT3040's on RB25's for 250rwkw. Of course an external gate GT30 will shit on an int gate HKS 2535.

[SLY33]

inasnt read properly. i said internal gate, and i said for example.

UAS have set up many internal gate Garret GT3040's on RB25's for 250rwkw. Of course an external gate GT30 will shit on an int gate HKS 2535, and pull 300rwkw.

[BOOSTD]

From Grepins Thread, posted by SK regarding the GT2835proS

Hi grepin, I like it, it has....

270 rwkw at 7,300 rpm

277 rwkw at 6,300 rpm

246 rwkw at 5,300 rpm

210 rwkw at 4,300 rpm

That's an average of 251 rwkw over the useable rpm allowing for gearchanges. There are plenty of cars with over 300 rwkw that don't average 251 rwkw.

I think it would be a nice car to drive, fast and progressive.

BTW guys, notice this dyno run was not in Shoot Out Mode, so no ambient air temperature compensation. If it was a 31 degree day, then on a 19 degree day it's gunna make a smidge over 300 rwkw with an average around 270 rwkw.

Wanna guess what the A/F ratios would be then? In my opinion Mick has done a good job, looks to be both safe and powerful, you don't see that everyday.

As I said at the start, I like it!

[Trust33]

trust33, bear in mind that Garret GT25 series are not the same as HKS GT25 series. for example to duplicate the ~250rwkw from a HKS GT2535 int gate youd need a Garret GT3040 int gate.

All because of the different compressor and turbine blade designs?

I have read that on sdu forums by mariogtr that whatever turbo i use the hks will allways flow closer to its full potential than a garret equivilent.He says somewere in the vicinity of 20hp is what you should take off of a garret turbos rating and it would give a better indication of what this turbo will pull.

Also being that all of these turbos are rated at stock boost 10psi or so.So there will be room for more power.

I say,now being that a stock rb25det turbo is rated at 250ps and has smaller .ar housings and includes ceramic bladed turbine,non ball bearing turbo and being able to see the power they can produce when pushed,that a garret or hks turbo with a better ps output to start will surely make arround 380-400 ps of what i am after.The only difference being that HKS will make it there easier.

If going an underrated turbo what are my chances of being able to elliminate/minimise lag and be able to come onto boost by 3500-3800 and still be able to make the desired 380-400hp/ps output int gate and run minimal boost?

Hks would be good but to be able to afford a brand new one i would have to buy from os.Have you seen hks-T au prices!meh..