Rb20 Turbo.

[mad032]

Garrett 3540 with Tial 38mm external gate.... another option!

[abu]

wow now you have me thinking lol

Just wondering what other modifications you have done?

Aftermarket plenum being the obvious one, and probably a z32, bigger injectors etc

Is the engine standard internally? How much boost to make 252rwkw and when does it hit full boost?

What size exhaust housing are you using on the 3540?

Thanks,

Abu

Edited September 22, 2007 by abu

[mad032]

Mods list:

Apexi power fc

Apexi avc-r

Apexi intake pod (mounted in fron bar)..... shithouse in the wet - great in the dry

Custom inlet plenum with belmouthed runners

Custom mandrel bent 3" S/S exhaust

Custom s/s highmount exhaust manifold

Custom s/s dump pipe with bellows for heat expansion

Garrett 3540 turbo .7 a/r and .63 exhaust

Gen111 5.7ltr fuel pump

Gtr fmic

Series 5 550 cc injectors

Tial 38mm external gate

Z32 afm

Q45 90mm infinity throttlebody

and 1.2 bar

hope this helps matie!!!

Edited September 22, 2007 by mad032

[Roy]

3540 is a huge turbo for an RB20. I would have thought that sized turbo on an RB20 at 17psi isnt even clearing its lungs.

[Cubes]

The 3540 for under 300rwkw is a massive overkill. Not only do you sacrifice spool but you sacrifice response which greatly affects low gear acceleration.

When does it kick you in the arse? 5500rpm?

Does it kick you in the arse in the lower gears (1st and 2nd) if rolling on the throttle or does it take until 3rd gear to really get up and go?

[mad032]

your way off! full boost by 4500 in every gear

[Cubes]

That is technically impossible. First and second will ALWAYS make boost later than the higher slower reving 3rd and 4th gears.

Especially with a turbo of such size on the 2ltr; unless you hold your foot on the brake.

Regardless I was talking about where it kicks you in the arse; i.e picks up/clears its throat/feels lively/free and screams off.

At 4500rpm its only making ~105rwkw; 5000rpm ~140rwkw and then 5500rpm ~190; the biggest jump in power is from 5000rpm to 5500rpm which suggests a little before 5500rpm is where it picks up and goes.

If it is making all its boost at 4500rpm its not doing a lot with it.

[QWK32]

i've seen a 3540 run successfully on an auto 32, laggy to start with but once its on, its all good. never a manual, most people would never think of it for the 2ltr.

[polishboi]

hey guys ive got a rb20 fairly stock standard would you guys recommend a GT3071r and what would the response be like ona standard cam. Obviously thingslike exhaust manifold, Injectors ,fuel pump ecu would all be done! thanks guys

[Roy]

your way off! full boost by 4500 in every gear

Whats full boost? 4psi ? Yeh i get a feeling that your mistaken when your car boogies! About 105-115rwkws at 4,500rpm suggests that boost is still a long way away

[iz32]

those asking about the gt2510 here are some results from my old setup bare in mind i suspect the dyno used was about 5-10kw too generous.

http://www.skylinesaustralia.com/forums/in...t&p=2184825

personally i wasnt a fan of the 2510 as it runs out of puff up top. since then i had it rebuilt into what resembles a GT2530 using a larger garrett turbine and the difference was amazing. it felt it was easily good for a REAL 225+rwkw @ 1.35bar. never had it dynoed due to tuning and workmanship issues but a huge increase nevertheless, it still lacked a lil grunt right up top....to this day even with a grinder spec turbine wheel it still spins the 18" 255 rubber @1.1bar in the dry.

personally i think chasing power under 4500rpm in a rb20 is a waste of time and money. they love to rev and are more efficient making top end power so you just need to make sure you have a good clutch and use it accordingly.

currently im thinking of rebuilding the GT2510 again with fresh bearings and using the GT2871 turbine with ext gate to get a constant 22psi out of it but i dunno how a rebuilt unit would hold up with that kind of pressure daily.....or another idea im throwing around is a GT30 of some sort to get a lil more power up top.

[Roy]

personally i think chasing power under 4500rpm in a rb20 is a waste of time and money. they love to rev and are more efficient making top end power so you just need to make sure you have a good clutch and use it accordingly.

I wouldnt say wasting time and money, but i do tend to agree that sizing your turbo to be on and hiking under 4,000rpm is difficult and often only get a handful of kws at those sorts of revs between a smaller turbo and one that will make 30-40rwkws more over 5,500rpm

[STATUS]

Garrett 3540 with Tial 38mm external gate.... another option!

fark that!!! td06-l2 will eat that.... everywhere, response and match your top end.

[Interloper]

i had the HKS2510 tuned to 1.2bar with 204rwkw on DrDrift's dyno - full boost by around 3200rpm

[Roy]

Can you get Sam to overlay the graph against your GT-RS and the TD06?

[Tomei_Powered]

agree with silver gts-t.

go for a bigger setup if you have the means.

youll regret it later.

anyway...anyone interested with a HKS GT2540 turbo?

going for a GT30 if i get to sell my current turbo.

[Ceffy_SA]

I recently bought a Garrett T3G (apparently an old'er version of the HKS 2530), its currently making 188RWKW without a tune on around 15psi, on my quite standard RB20 its making full boost (15psi) by 3200rpm in 3rd gear.

I purchased the turbo for $1000 and its almost a bolt on affair (oil line mods and turbo outlet).

Just another option for the RB20

[Interloper]

Can you get Sam to overlay the graph against your GT-RS and the TD06?

will do. ATM Sam's back is stuffed so he ain't working for a while.

what i can compare to is my GTRS and going from the dyno sheet the 2510 produces exactly 50rwkw more at 90kmh in 4th and 40rwkw more at 100kmh. But from 135kmh the GTRS pulls away & the graph doesn't fall off as quickly due to the bigger exhaust housing having less restriction....

I'm gonna get cam gears for the 2510 so hopefully i'll gain at least 15rwkw right up top & the power won't fall away as quickly...but cam gears are only gonna happen once you make that cooler piping for me

[Roy]

50rwkws at 90km/h! LOL, OK then, i take back what i have said earlier as most smaller turbos only seem to make 5-15rwkws more earlier in the rev range....i will take the 50rwkws at 90km/h and happily trade it for a bit of top end. My housemates STI with onkly 200rwkws is so much quicker around town then my car because it so grunty at any rev

[limpus]

50rwkw more at 90km/h...thats a HUGE improvement!!! can we see the dyno graphs when you get them? would be very very interesting...cheers...