how much boost for rb 20?

[r32skyza]

This has more than likely been asked before but i am new so please be nice. I just want to know how much boost an internally standard rb20 can take before something goes pop. eg the head gasket. I have a hks turbo currently running 20psi and it seems to be running fine, no knock or detonation. Any feedback appreciated.

[meggala]

what type of hks turbo I wouldnt go much pased 20 psi and I would turn it down when you dont need the power. jsut to be safe

meggala

[Roy]

So your new? HKS turbos are no good, give me $400 and ill take it off your hands.

If it were my engine id be sticking with about 16-18psi. (1-1.2bar)

[r32skyza]

awesome, thanks for that. I don't want to blow it up just yet hehe. As for the me giving you (roy) $400 for a turbo that just recently cost me 2g. I DONT THINK SO. but thanks anyway: ) It's a gt2530, however it has been modified with a larger compressor cover and wheel, I think gt28 series. Turbine is still standard 2530 so it gets full boost at 3200-3400rpm but has heeeeeeeaps of top end. good fun when crossed up sideways : ) Still yet to be dynoed but am expecting about 210-215kw. Basically the stock injector limit. What have you done to your cefiro meggala? does anyone know if someone out there has stroked an rb20? I am thinking of doing it but want to know if it's worth it first.

[zforce]

the stock injectors limit is 170rwkw btw......have seen more but...

stroking the RB20 isnt worth it, might as well wack a R25 or 26 in for the price, you need RB26 Rods and crank and 86mm pistons (i think like 4AGE pistons, or similar), that will get you a 2.4L but not worth the $$ or effort.

i dont know whats the go with this : "It's a gt2530, however it has been modified with a larger compressor cover and wheel, I think gt28 series." I just dont know why someone would modify the HKS turbo and change the wheels, seems pointless, might as well buy a garrett turbo.

[r32skyza]

I have seen 220kw from an rb20 with stock injectors. My last dyno it made 190 with fuel probs and fouled plugs. True story! who told you 170kw? I dont know about the turbo either, I didn't modify it. All i can say is it pulls hard, spools up early enough and i'm happy with it's performance. Thanks about the stroker kit advice. I should just buy a GTR instead.

[Roy]

, might as well wack a R25 or 26 in for the price, you need RB26 Rods and crank and 86mm pistons (i think like 4AGE pistons, or similar), that will get you a 2.4L but not worth the $$ or effort.

Fair point, but the 2.4L does have its advantages on paper (i havent been for a ride in an RB24 powered car, so dont know from experience)

If you go RB25 or 26 route you are likely to have an internally factory engine (Nothing wrong with them mind you) You have issues regarding rego and insurance. Require new IC plumbing, tailshafts, general installation wiring dramas. It is still a relatively straight forward job as far as engine transplants go, but there is still all additional work.

Now with the RB24 not only does it bolt all back in with no rego or insurance hasslees as noone need be the wiser. You get the comfort of having a new engine built with internals that will better equip the engine for revs and boost and also likely power. I have seen an RB24 powered R32 GTSt on a DVD that was running 10s with a big ass turbo (T88 or T78???... anyone else seen the car, it was red)

What would be interesting is a how a stock $2500 RB25 with something like a HKS 2835 turbo would compare to an RB24 with the same turbo. Any thoughts ppl?

[zforce]

theroitically it is 170rwkw, thats why i added, have seen more but.......

[r32skyza]

what do you reckon a set of rb26 rods and a crank would set me back? I can get forced pistons with rings for 1500, is that good?

[zforce]

pistons not to bad, the rods and crank another $1500 probably, and then you gotta get them machined, and the bore oversized etc, probably another 1-2g's worth of work. Personally i wouldnt bother, 250rwkw is crazy anywayz (stock limits of interals)....

[Roy]

Oh god here we go:D

I have seen R32 rods and GTR cranks for sale from as low as $800. Apparently in good order.

But thats only the start of it, do your homework before buying anything.

[zforce]

There is a really good post on SDU or here where a guy has actually done the conversion, he can tell you exactally what is involved in the modification..

[r32skyza]

sweeeeet, I might have to talk to a few engine builders and see what they say about it. I'll check to see what my wallet has to say about it too! thanks people. zforce, can you direct me to that post?

[Roy]

Do a search for the username TranceformEr on SDU. He was rebuilding his RB24 so has the advantage of having torn apart one that was already built, then finding the parts to re-build.

So in addition to what he can tell you will still need to speak to an engine builder re-machining the block to clear the RB26 crank, accept RB26 bearings etc, etc.

All in all when i did some numbers they were coming out near $7,000, and unfortunately i cant justify that sort of spend even if i had the money.

[zforce]

Here is teh search results

http://forums.skylinesdownunder.co.nz/sear...rder=descending

Here are a few links

http://forums.skylinesdownunder.co.nz/show...3&highlight=2.4

http://forums.skylinesdownunder.co.nz/show...0&highlight=2.4

http://forums.skylinesdownunder.co.nz/show...5&highlight=2.4

http://forums.skylinesdownunder.co.nz/show...7&highlight=2.4

http://forums.skylinesdownunder.co.nz/show...4&highlight=2.4

http://forums.skylinesdownunder.co.nz/show...4&highlight=2.4

http://forums.skylinesdownunder.co.nz/show...5&highlight=2.4

http://forums.skylinesdownunder.co.nz/show...4&highlight=2.4

have fun!