stock boost

Post by **Projekt** » Mon Mar 10, 2003 4:07 am

self explanitory. What's the stock boost on an RB25?

Post by **dreamsOfSkylines** » Mon Mar 10, 2003 4:07 am

I think 7 psi but I'm not positive.

Post by **themadscientist** » Mon Mar 10, 2003 4:07 am

not PSI .7 kilo which is about 10-10.5 lbs

Post by **Projekt** » Mon Mar 10, 2003 4:07 am

you mean .7 Kg/mm^2? aka about .7 bar?

Post by **d240t2** » Mon Mar 10, 2003 4:07 am

The RB20DET boosted ~10psi stock. I won't speculate about other motors.

Dennis KalmanunStable Hybrids

Post by **Projekt** » Mon Mar 10, 2003 4:07 am

night, was your stock boost rating with or without a stock downpipe?

Post by **rbsileighty** » Mon Mar 10, 2003 4:07 am

NightXCZ77 wrote:RB20 also has a compression ratio of 8.5/1 which would make sense that it is running the same or almost the same boost as the GT-R engine which runs 11 psi from articles I have read.

Night

Yeah... mine showed 10 on the trial run... and that was at fairly low revs too!!! Just some additional info...

Post by **WDRacing** » Mon Mar 10, 2003 4:07 am

My friend ran his @ 1bar 14.7 psi all the time. All stock except for a FMIC.

WD

Post by **meggala** » Mon Mar 10, 2003 4:07 am

Ihave run my rb25 turbo at 1 bar its fine you might need a restrictor inthe line that goes from to your actuator they can be tricky buggers a mate has a simialr problem to day night try a manual bleed with a restrictor b4 you ditch your turbo also check you boost gauge for accuracy.meggala

Post by **meggala** » Mon Mar 10, 2003 4:07 am

quite a few peopel here hiflow the stock turbo with great results but a t3/4 from your area would be good or you could go the whole hog for a t 4 which are great jsut dont forget the fuel system

Post by **bob marley** » Mon Mar 10, 2003 4:07 am

meggala wrote:Ihave run my rb25 turbo at 1 bar its fine you might need a restrictor inthe line that goes from to your actuator they can be tricky buggers a mate has a simialr problem to day night try a manual bleed with a restrictor b4 you ditch your turbo also check you boost gauge for accuracy.meggala

I think that is basically what a fuel cut defenser (FCD) does correct? I thought you needed to get one to allow raised boost levels so you don't hit fuel cut? I think it sends an electronic signal so the car thinks its running stock boost, when in fact, it is boosting more. I do not know of any boost controller that came with this option though. I think it is something you attach to the ECU.

Just an idea

Anyways, I love your cars Night and Meggala

Johann

Post by **rbsileighty** » Mon Mar 10, 2003 4:07 am

bob marley wrote:I think that is basically what a fuel cut defenser (FCD) does correct? I thought you needed to get one to allow raised boost levels so you don't hit fuel cut? I think it sends an electronic signal so the car thinks its running stock boost, when in fact, it is boosting more. I do not know of any boost controller that came with this option though. I think it is something you attach to the ECU.

Just an idea

Anyways, I love your cars Night and Meggala

Johann

Correct me if i'm wrong... but I think the fuel cut is beyond the limits of the factory ceramic turbo. I'm going with a new comp before I get another turbo, so i'm not even going to mess with a FCD. I bet it's awesome being able to turn the your MKIV up to 17psi on stock turbos!

Post by **Projekt** » Mon Mar 10, 2003 4:07 am

and FCD just tricks the computer, but it doesn't raise boost.

Post by **bob marley** » Mon Mar 10, 2003 4:07 am

Projekt wrote:and FCD just tricks the computer, but it doesn't raise boost.

I know, thats what I meant

. But don't you need something like that before you raise the boost?

Post by **Projekt** » Mon Mar 10, 2003 4:07 am

you don't need it, but it sure helps.

Post by **cyris3d** » Mon Mar 10, 2003 4:07 am

Projekt wrote:you don't need it, but it sure helps.

so you can turn up the boost with out a FCD.. and it wont cut fuel?

Post by **Projekt** » Mon Mar 10, 2003 4:07 am

yup :0) i'm sure you can trick a sensor though without having to buy a 200$ box.

Post by **bob marley** » Mon Mar 10, 2003 4:07 am

Maybe the FCD is more expensive for other cars; I'm not sure. But the one for the Supra/Mr2 was 100 from greddy new, and I just bought one used for $40.

You can also do a Free FCD (FFCD) mod. Here is one way for the supra: http://www.mkiv.com/techarticles/ffcd/freefcd.htm. I know there is another way too. My friend made his for his mr2 a different way.

Johann

Post by **Projekt** » Mon Mar 10, 2003 4:07 am

yeah and you can make a boost controller for $6 too

stock boost

stock boost

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