RS500

does it always glow red after a few short stabs or only after a very hard run?

Mafia, having a look at the exhaust system first off would be a good option as this area has been found to restrict engine power and turbo gas flow. if this doesn't help, then maybe look at the wastegate exit area on the turbine housing.

rochester injectors are a good option also. if interested, i can get you some at a competitive price for the size you require.

dude, that's no good. if you're making boost with the gate completely open, then there is a restriction on your exhaust side, maybe the VG30 exhaust housing doesn't flow all that well when matched with the GT30 turbine.

dude, the garrett GT3071R (external w/gate version) will flow enough air to make 250rwkw happily. the comp wheel itself can flow up to ~450bhp, and the turbine is the 60mm GT30 wheel which flows ~500bhp easily. the GT3071R with A/R .82 on an RB25DEt would be a killer combination IMHO. good luck anyway.

just some info i found out last night when speaking to my friend (tuner/engine builder for PET Modifications) about RB20DET's, he told me that they built an RB20DET a few years back with forgies, uprated rod bolts, slight headwork, cams, Autronic, etc and managed to get 388rwkw out of it. this thing was running a garrett T66 (with P-trim exhaust wheel) and lots of boost and was quite laggy, but none the less the power was made which i was amazed with. i didn't think RB20DET's could flow that well. so RB20DET's aren't all that gutless after all, have a nice weekend ;-)

and you're happy with that? then why change turbo's? fyi, a properly setup engine with the GT30R (A/R .63) will be able to make up to 300rwkw with much less lag than what you're used to but anyway, again it's up to you.

dude, is that a genuine Garrett GT exhaust housing?

dude, the A/R .82 on a GT3040R is way too big for an RB20DET, it will be too laggy. you'll see full boost b/w 4600-5000rpm, not ideal for a street car. fyi, the turbo itself is too big given the size of the comp wheel. i'd recommend a GT30R with a .63, much better combination for a 2L engine. i had a GT3040R on my engine (2L YBD sierra cosworth) with an A/R .63 and it was still laggy. full boost ~24psi was at 4200rpm with a very fast ramp up, hence - plenty of wheel spin. just my 2c, but it's up to you.

dude, please correct me if i am wrong, are you running an internally gated A/R .82 housing on your turbo? if so, what brand?

you're cool dude. actually the HKS Pro S exhaust housings are also a cost effective solution and allow for easier fitment and as u say, also give the standard look.

a bit more in detail but you beat me to it disco ;-)

the GT3071R (with larger 60mm GT30R turbine wheel) is available with a T3 flanged exhaust housing to suit external w/gate. Given this, there is no need for an adapater plate or even an aftermarket exhaust manifold. just weld up a flange for the external on the factory manifold and you're swet ;-) this turbo with an A/R .82 would be your ideal combo for a quick street car with good response.

where is the car located?

give my friend Paul a call at APS (Automotive Performance Solutions - 94553222) in heidelberg, he should be able to help you out. btw, let him know i referred you.

they should be right at home when running b/w 16-22psi.

fyi, the RB20 & RB25 versions of the HKS GT2530 did not have HKS cast on the compressor housing. they used the standard T03 garrett housings.

dude, have you been priced on the dba rotors for your skyline yet? fyi, i have access to good prices for the DBA 4000 & 5000 series rotors. If interested PM me.

quincy777, i see you already made your decision and bought the GT3071 - which one did u go for, GT3071R (with 60mm turbine wheel) or GT3071 (with smaller 90 trim turbine wheel)? good luck anyways, let us know how u go.

Dude, it's actually closer to $1000-1100 per turbo as the exhaust wheel needs to be replaced, and in the process the turbo gets a full reco kit put through it inc. a 360 degree thrust bearing to allow the turbo to withstand longer periods at higher boost levels. BNR, Dennis at P.E.T modifications (9464-4225) can get this done for you, give him a call and let him know gorjan referred you, he should help u out.

maybe the first question to be asked is 'how much horsepower does quincy want/need'?

dude, what are u after out of your car? the gt3040r (with A/R .63) is quite a big turbo and wouldn't be all that responsive for a street driven RB20DET. it all comes down to how much power you are looking for out of your car and how/when you want to make that power. i personally had one of these on my car (sierra cosworth), and although it made pretty good power (~280rwkw @ 24psi), it didn't provide the response i actually wanted. this was due to the big compressor wheel it has. so as above, work out exactly what u want out of the car and then we'll try to help you. Dude, drop me a PM, i'll try to help you out. good luck.

dude, the GT25/40R which you are looking at on ATP's website is way too small for an RB25DET. reason being is that the turbine wheel (53mm - 62trim) is too small to flow anything more than 320hp. comparing the turbine wheel, it is actually the same wheel as found in the HKS GT2510 which was rated at ~310hp. and now for the compressor wheel, the 60mm - 60 trim (as stated on the ATP Turbo website) is actually a smaller version of the comp wheel in the same HKS GT2510 (60mm - 63 trim). this is the correct compressor map for the GT25/40R; http://www.atpturbo.com/root/maps/gt28r.htm so given this, this turbo would struggle to even make 350bhp let alone 400+ bhp. i believe the ideal turbo for the RB25DET is the GT3071R, which has teh large GT30 exhaust wheel for plenty of flow and the larger 56 trim GT35 compressor wheel which can flow up to 450bhp. this would be a far more efficient turbo for the RB25DET. otherwise you could go for the internally gated garrett GT3071R (with 90 trim turbine wheel and GT25 flanged A/R .86 exhaust housing). This should be able to flow around 420bhp.

who fitted/tuned the car with the cams?

Roy, what is this new turbo you are waiting for? you can PM me if u don't want to mention it here.