Turbo Tune's Stock Rb20 Making 370rwkw

[SKYPER]

Just noticed there's a RB20 (I gather RB24) in the Top RB20 Club making similar power figure

(367rwkw) with cams + HKS TO4ZR turbo at 23psi (post #1602) -

http://www.skylinesaustralia.com/forums/To...&start=1600

Edited April 9, 2008 by SKYPER

[Ryanrb25]

Im interested to know what sized rear housing and wheel is on the rear of a t04z, surely its not 1.6 like a few t04z's. We recently experimented with a mates RB20 with forgies and all sorts and made 291rwkw on 16psi with a gt3540 with a 1.06 rear. However out boost curve is identical to the power curve and never levels out...LOL! however this 20 made 30psi quickly and leveled out. Any insite jeff as to what could cause such a gradual boost curve? Got cams n all.

Edited April 9, 2008 by Ryanrb25

[TSL]

Just noticed there's a RB20 (I gather RB24) in the Top RB20 Club making similar power figure

(367rwkw) with cams + HKS TO4ZR turbo at 23psi (post #1602) -

http://www.skylinesaustralia.com/forums/To...&start=1600

Yeah i noticed that too, the extra capacity of the rb24 and big cams really help. You can see how we run much more boost for the same power but i am honestly surprised that a totally stock rb20 head can flow as much as it does with standard cams. The ports and valves are pretty small.

I think it is cool that both these engines are running on remapped standard ecu.

Im interested to know what sized rear housing and wheel is on the rear of a t04z, surely its not 1.6 like a few t04z's. We recently experimented with a mates RB20 with forgies and all sorts and made 291rwkw on 16psi with a gt3540 with a 1.06 rear. However out boost curve is identical to the power curve and never levels out...LOL! however this 20 made 30psi quickly and leveled out. Any insite jeff as to what could cause such a gradual boost curve? Got cams n all.

Hi Ryan, the turbo is actually a GT4094R - garrett 751470-20

If you are having problems with lazy spooling the things to look for would be exhaust manifold leaks, wastegate leaking, cam timing.

[Madaz]

would love to but yeah dont have a spare engine for when things go pear shaped

ok MADAZ we are using your car and motor as the test mule. lol

If it blows up dont blame us though.

[Twisted_SIL80]

and i would be the stupid excited person to post it on ns.com lol...

sorry but who isnt haha!!!

[Lock_to_lock]

haha good ol' 20's

[Ryanrb25]

Yeah i noticed that too, the extra capacity of the rb24 and big cams really help. You can see how we run much more boost for the same power but i am honestly surprised that a totally stock rb20 head can flow as much as it does with standard cams. The ports and valves are pretty small.

I think it is cool that both these engines are running on remapped standard ecu.

Hi Ryan, the turbo is actually a GT4094R - garrett 751470-20

If you are having problems with lazy spooling the things to look for would be exhaust manifold leaks, wastegate leaking, cam timing.

yea thanks jeff, its got a pair of jun cams and cam gears, full rebuild with aries pistons, we tuned it ourselves with a microtech ltx12s, i think its just the nature of the turbo and 20 combination....goes like an animal nonetheless, cheers for your advice. we'll tinker a little bit more.

[GTR1993]

What RPM are you seeing say 20 psi by with the 4094?

[Ryanrb25]

by the looks of things its around 160km/h so around 3800-4000rpm depending on the ratio. Keeping in mind, depending on what bleeder/controller you are using boost will be a bit flatter if it isn't so high because the actuator will start to open sooner with lower boost. Only slightly tho.

[GTR1993]

I guarantee you that you wont have 20 psi by 4000 with a 4094 and rb20, would be closer to around 6000 most probably.

[SLED]

Thats some pretty sik numbers Jeff, (around 500hp) good effort.

That magical 400kw figure doesn't seem too far away with a decent cam profile.

I noticed you've decreased spring travel to increase the rate & seat pressure, as long as there is no chance of binding & room for more lift I can't see why you wouldn't get even more impressive numbers.

We must hook up as discussed a few weeks ago when I get back from QLD, cheers.

PS: As others have already stated here, it sounds like you'll get a better reception here as opposed to ns.com

[Krishy]

I want my RB25 making that power now

[grandmasterb]

Sorry to dig up an old thread i was just after some info on the re shimmed stock valve springs if anyone can enlighten me???

I have HKS 264 cams (cant remember the lift) to go into my RB20 and wasn't keen on upgrading the valve springs if i didn't have to

Just wondering who it was that shimmed them, whats involved and roughly how much it cost???

Cheers Ben

[jager]

mate seems like turbo tune ain't change much since back in 05/06 they overtuned my engine which almost went bang, before i ripped it out and put a new one in then took it blackwood dyno got a tune from them sudden;y more power better response and it didn't wanna go bang anymore,

then they told me wasn't us it was u!!!

for the 1500 bucks i spent on rb25det including buying and installing and tuning (only 40,000ks on engine) i didn't bother trying to chase it up legally would have cost me to much then

thats my glowing recommendation for turbo tune love ya!!

[morbsy]

whats the highest safe amount of boost to run with a stock rb25?

[Ryanrb25]

mate seems like turbo tune ain't change much since back in 05/06 they overtuned my engine which almost went bang, before i ripped it out and put a new one in then took it blackwood dyno got a tune from them sudden;y more power better response and it didn't wanna go bang anymore,

then they told me wasn't us it was u!!!

for the 1500 bucks i spent on rb25det including buying and installing and tuning (only 40,000ks on engine) i didn't bother trying to chase it up legally would have cost me to much then

thats my glowing recommendation for turbo tune love ya!!

dude, im not saying your wrong or right etc.... i just want to clarify the rb20 that they have built was a lazy engine that was replaced my a fresh one out of a customers car, which had been laying around, they put it in an s14 shell, used a whole heap of parts laying around and FOR A LAUGH tried to find the limits of the motor, It was over a few beers, a few mates and a few laughs after hours and im pretty sure they intended to blow it up, It was by no means an example of what they'd deliver to a customer in any way...

whats the highest safe amount of boost to run with a stock rb25?

do a search man, i personally wouldn't run any more than 17-18psi which a thicker headgasket.

[Simon-S14]

i run 1.2 bar. reliably, with stock HG

[Ryanrb25]

most people will say its in the tune, which im also a firm believer of.

[R31 drift pig]

Ryan... the soloution for chris's car is simple.....

Nitrous. And Lots of it.

I am also intending running 1.1 - 1.2 bar with stock head gasket.... not pushing the same power as you though Simon.

[Ryanrb25]

and simons is a 25 ben, different motors when it comes to boost....