14psi on my rb20 with rb25 turbo.

Post by **RB20DETodd** » Mon Sep 12, 2005 2:43 am

My, boost controller came in today woohooo anyways, i thought id give it a try at 14 today and WOW pulls like a turbo car should, i know most people say stay below 12, a few of the aussi guys say they run around that boost too, i was curious what boosting it at 14 could do other than rocketing the exhaust wheel out the exhaust, i have my spare rb20 turbo so im not 100% worried about the turbo, more the engine, i heard the rb20 can handle up to 400hp on the bottom end, i have the smic on but should have the front mount in in about a week, also can my stock fuel system handle this? Any thoughts?

-Todd

Post by **Fenvy** » Mon Sep 12, 2005 2:58 am

kaboooooooooooooom

just kidding

why not just stay below 12psi until you're ready?

isn't the stock rb20det injectors 444cc?

with that kind of boost, your are probably pretty close to maxing out the injectors

Post by **Nameless EJ6** » Mon Sep 12, 2005 3:29 am

I hope you don't think it'll last if you keep doing it.

Post by **Andrew85cm** » Mon Sep 12, 2005 4:07 am

444cc injectors thats new to me. RB20 injectors are actually 270cc injectors. If you had 444 you wouldnt and couldnt max them out with that turbo before it went. Just correcting you loveless.

Post by **Fenvy** » Mon Sep 12, 2005 4:09 am

oh my mistake, I Did a search and it's what turned out

if it's that low than it sounds like its' going to blow up soon

kabooooooooooooooooooooom

Post by **Eikon** » Mon Sep 12, 2005 4:45 am

Correct.. the Rb20 injectors are 270cc.

With your Rb25 turbo at 14 psi.. what HP to you estimate you were making? If you think you were near 300... you would have pretty well maxed your injectors and you were probably close to doing some damage.

I have also heard that you shouldn't boost a RB20 past 12 psi... but that is on the RB20 turbo.

The Rb25 turbo will make more hp than the RB20 turbo at similar boost levels. Example... Rb20 at 10 psi vs. Rb25 at 10 psi... the 25 turbo will make more power.

But, that's not to say that the RB25 turbo will handle that much more pressure.

See the following link... it's recommended that you don't take the RB25 turbo past 10 PSI. At 14psi you really risked blowing it. zerothread?id=83607

Post by **gawdzilla** » Mon Sep 12, 2005 4:46 am

RB20DETodd wrote:i was curious what boosting it at 14 could do other than rocketing the exhaust wheel out the exhaust, i have my spare rb20 turbo so im not 100% worried about the turbo, more the engine, -Todd

that doesn't always happen. the turbine wheel isnt gonna come out as one piece and fall out the exhaust. it will shatter to bits and can very easily shoot pieces backwards and into your head. It is a definite possibility. I know of an sti that did this and ruined his head/block.

Be careful when you think about "blowing the turbo" and replacing it. It doesn't awlays blow in a nice manner.

Post by **rbsileighty** » Mon Sep 12, 2005 7:55 am

Eikon wrote:Correct.. the Rb20 injectors are 270cc.

With your Rb25 turbo at 14 psi.. what HP to you estimate you were making? If you think you were near 300... you would have pretty well maxed your injectors and you were probably close to doing some damage.

I have also heard that you shouldn't boost a RB20 past 12 psi... but that is on the RB20 turbo.

The Rb25 turbo will make more hp than the RB20 turbo at similar boost levels. Example... Rb20 at 10 psi vs. Rb25 at 10 psi... the 25 turbo will make more power.

But, that's not to say that the RB25 turbo will handle that much more pressure.

See the following link... it's recommended that you don't take the RB25 turbo past 10 PSI. At 14psi you really risked blowing it. zerothread?id=83607

Based purely off calculations... I'd say he's making up to around 280-300 bhp (at the crank) since the max power of the 20 with stock cams and intake manifold comes in around 6100-6500 rpm... probably less with the stock interheater.

It all depends on how often he's running 14psi... if it's prolonged highway pulls or whatnot at that boost level... it will probably die much faster than the occasional 14psi run when passing grandma. The way I understand these turbos fail is the adhesive fails due to prolonged heat exposure caused by higher boost pressures and EGT's... so play with boost at your own risk... but no need to over dramatize the whole situation

My RB25 turbo is going on in about 2 weeks... I have no boost controller now, but I'm thinking about making a ball and spring valve to help wastegate reaction time and maybe flirt with 14psi on occasion. I also plan on trying to get some measurements on the turbo's blades to see what we are really dealing with in a RB25 turbo... only if I get time. I am pretty sure though that the whole T28 comp mated to a T3 turbine rumor is false since I heard Garrett did make a limited run of T25 and T28 housings with T3 flanges for "a Nissan application."

Enjoy the turbo bud... but don't blow it... pun intended

Post by **RB20DETodd** » Mon Sep 12, 2005 2:52 pm

Thanks for the info guys, the car feels awesome i dont want to give up the power but i think fuel is the issue. So back to 10psi.I think bad things are already happening haha, i went to start my car today and i have my e-fans wired into the fuel pump fuse and i was about to turn it over and i thought to myself i dont hear the fans running, turns out the fuse kind of burnt, so i re positioned the wire and stuck it back in and went to start it up and it wouldnt fire, well i blew 2 fuses before i just took the e-fan wire out of there, im not sure why its doing this ive had this setup for the past 8 months now.

Post by **Carl H** » Mon Sep 12, 2005 4:39 pm

you are running the fans off of the fuel pump voltage supply?thats just fking retarded, good way to cause fuel starvation.the fuel pump already doesnt get enough fuel because voltage drops with revs, those e fans arnt helping much.get a thermo fan switch and do it right.

Post by **sean8564** » Mon Sep 12, 2005 4:43 pm

so on 14psi with a 25 turbo what kinda HP numbers are you looking at

Post by **RB20DETodd** » Tue Sep 13, 2005 2:56 am

sean8564 wrote:so on 14psi with a 25 turbo what kinda HP numbers are you looking at

Im gessing about 230 to the wheels, it hauls ***, Carl whats a good way to wire the fans so they come on when the engine starts?

Post by **rbsileighty** » Tue Sep 13, 2005 3:29 am

Regardless of what you use as a trigger... run the fans themselves on their own 30 amp relay...

Post by **king723** » Tue Sep 13, 2005 1:26 pm

[QUOTE=RB20DETodd]

Im gessing about 230 to the wheels, it hauls ***, Carl whats a good way to wire the fans so they come on when the engine starts?[/QUOTEOP

splice the 12v wire off the fan to the cigarette ligher 12v wire inside the car.

Post by **ehacker01** » Wed Sep 14, 2005 10:49 am

rbsileighty wrote:Regardless of what you use as a trigger... run the fans themselves on their own 30 amp relay...

I run a painless wiring thermo switch kit. They kick on @210 and off @180 and have there own relay and breaker

Post by **hazw8st** » Wed Sep 14, 2005 11:03 am

Damb 14 lbs of boost on a RB20 with a RB25 turbo. How do our EGT's look? Sounds like you're pushing it dude. Save up some $$$ for the new turbo.

14psi on my rb20 with rb25 turbo.

14psi on my rb20 with rb25 turbo.

Re: (Loveless)

Re: (Nameless EJ6)

Re: (Loveless)

Re: 14psi on my rb20 with rb25 turbo. (RB20DETodd)

Re: (Eikon)

Re: (rbsileighty)

Re: (RB20DETodd)

Re: (Carl H)

Re: (sean8564)

Re: (RB20DETodd)

Re: (RB20DETodd)

Re: (rbsileighty)

Re: 14psi on my rb20 with rb25 turbo. (RB20DETodd)

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