RS500

tune definitely plays the biggest part when coming to producing power & torque. this is where the secret is to extracting power from the engine.

RNS-11Z, i'd like to know what exhaust housing you have with your GT35 as this in itself would restrict the amount of power that you'll get from your engine. for eg, the GT35 with an A/R .63 exhaust housing (714568-0003) is rated at 550hp whereas the core itself is actually rated at 600hp. http://www.turbofast.com.au/GTseries.html btw, does the turbo boost/power come in pretty quick or is it reasonably laggy?

Steve, i could swap you for a genuine HKS A/R 1.01 housing if u like

you're cool dude.

gts-t, I'm not sure that garrett makes a .68 exhaust housing. are you sure it's not the .64? also, how quick/slow does boost/power build up on your engine?

hehe, with that kind of power, i'm sure you'll definitely improve on the 13.5. with a good setup, that should be 11s material.

thanks for that dude. btw, i think u should update your signature now

GTS-T VSpec, which GT30 core and housings do u have on your engine?

with the size of the exhaust housing, that thing would be laggy on a VL or even a Supra, so i would not like to imagine what it's gonna be like on an RB20DET. Steve, i predict 6000rpm in 4th gear

sorry, my mistake.

i believe this turbo is rated the same as the HKS GT2530 , 320ps but i've heard it out flows the HKS turbo.

EVOIV, try Autobarn or Repco if they exist in SA.

Steve, very impressive power there dude. good stuff. was the power run done in 4th gear?

Gav, it will actually say 'GT2530' on the centre core of the turbo.

this turbo has been SOLD.

well written dude.

Hi all, a friend of mine has a brand new Garrett turbo for sale. Specs are as follows; Garrett T04 turbo; * T04E A/R .70 compressor housing * T66 (66mm) compressor wheel * P-trim exhaust wheel * T03 A/R .63 (VL) exhaust housing this turbo is ideal for a genuine street driven VL and is capable of making up to 350rwkw and pushing a VL into the mid 10sec bracket with a larger exhaust housing. SOLD PM me or reply here if interested.

i'm not nit picking dude, i'm just stating a fact. air-flow (lbs/min) x 9 = engine hp but it cannot be close to rwhp.

BOOSTD, correct, 45lbs/min would give your approx. value of 405-410bhp, although, this is not to be confused with rear wheel hp. therefore, 405hp (302kw) at the flywheel would roughly work out to ~250kw at the wheels after power loss through the drive line. so again, you are running your turbo at 105,700 rpm and 55% efficiency.

if he could pay the money for a HKS GT3037 Pro S, i think he should be fine to pay for some braided lines

BOOSTD, for this turbo to be making the 253rwkw or approx 420ps as u state at 1bar, you'll need to be pushing about 45lbs/min which according to your compressor flow map for the V-trim wheel means that it's running at ~105,700rpm and about 55% efficiency. not sure that it's as good as you're saying.

which GT28 are you talking about, do u have the CHRA number?? fyi, a friend of mine has the 400hp GT25 (A/R .64 exhaust housing) on his RB20 and on 18-19psi it made 222rwkw with an internally standard engine, standard cams, unichip, standard injectors, bigger in-tank fuel pump, FMIC, etc. this thing goes pretty hard and isn't all that laggy so i'd say, go for it, it should be fine.

EVOIV, how about you give me your good turbo until you get the other one fixed

EVOIV, actually, a turbo's "rated hp" is affected by the different A/R sizes of an exhaust housing. fyi, we'll take Ray Hall's GT series website as the prime example as to illustrate what we are talking about. http://www.turbofast.com.au/GTseries.html when looking at the CHRA assemble section, the following GT30 core is rated at 600hp (700177-0014). that's all nice, although when this turbo is bought complete with an A/R .84 exhaust housing, it is only rated at 550hp (SB8006A) and infact it needs the A/R 1.06 housing to make the rated 600hp. does this make sense?? yeah, i've made up my mind, i want a HKS GT3037S why don't u just give me the 3037 that's on your EVO, then that'll prompt you to fix the other one so that you can get your car on the road

Steve, check out the following turbo comparison table and you'll see that the GT3037S is actually rated at higher hp than the largest of the Trust TD06 20G. http://fangartists.com/pics/turbo_comparison.jpg the larger housing will decrease the amount of back-pressure in the exhaust housing allowing exhaust gasses to flow more freely giving higher hp at the cost low-down turbo response. Actually, the .61 would be perfect for my 2L cossie btw, would any of you guys care to part with any of these GT3037S' that you have in your possession?? EVOIV, having the larger exhaust housing will bring the compressor into it's efficiency range of air-flow at a higher rpm but given the decrease in back-pressure, it will flow more gas hence more power, especially at higher boost. the rule of thumb generally is that the bigger you go in the exhaust housing, the more you air/gas flow you get at higher rpm while sacrificing down low air-flow and response, whereas going smaller will allow more air/gas flow at lower rpm while sacrificing air/gas flow at higher rpm, hence loss of power.