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Boost Solenoid Mod 0-100 Times

groonsnout
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groonsnout Contributor

groonsnout

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Modded my boost solenoid, So just a quick post with some 0-100 times on my stock S1 RS4. All recorded on a g-tech at night (canberra = cold)

Before mod (stock boost cut until 4500 rpm)

Run 1: 8.28

Run 2: 8.37

Run 3: 8.19

After mod (full boost throughout range)

Run 1: 7.31

Run 2: 7.38

Run 3: 7.29

worth your time!

Cheers!

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https://www.sau.com.au/forums/topic/172290-boost-solenoid-mod-0-100-times/
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ssshonky Grand Master

ssshonky

Posted
Posted

has anyone gone to the effort to extend ( what I beleive ) is an easy mod one step further?

would be good if you could get a 2 way switch to allow you to go between the 2?

Ie .. stock setup - low boost till 4000rpm

then full boost from 0 - redline

could be a good thing to do

groonsnout Contributor

groonsnout

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not worth the effort, leave it at full boost, and control it with your foot. :wub:

Just the standard ground the solenoid so it's open all the time (or just bypass it..) but as far as having a switch for it.. I don't see a lot of point, as it's much more responsive with it fixed, and uses a reasonable amount of less fuel. More midrange = less right foot.

But was good to see a difference in numbers, not just feel. It was mainly off the line where it made the difference. Up to 50 kph or so was HALF the time. I also tried one run with loading up the stall but the brakes couldn't hold it under full throttle.

fun stuff anyway :) I would have done some 0-400m but not a lot of ACT roads where doing 150kph recommended..

:)

groonsnout Contributor

groonsnout

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  • Author
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I don't suppose you could follow this up with some numbers on your fuel economy?

Anywhoo, thanks for sharing the lurve :)

When I did the mod I went from about 390k a tank to 450k a tank, but it's all really down to driving style I guess.. I'm pretty easy on the car, doesn't spend much time above 3500rpm, but doesn't have to now.. before you really had to wring the neck out of it for any sort of performance, so effortless now. Different car! Even feels better down low than my TT 300zx which is 3L and has 2 turbos (manual)

The mod is just in the sticky section under DIY.. I think it's called full boost modification or similar.. 5 mins work..

mitchy_ Grand Master

mitchy_

Posted
Posted

its called rb25 boost solenoid mod i think.

essentially you ground the solenoid, so its always open (the ecu opens it at 4,500rpm, so you have 5psi boost to 4500rpm, then 7 over that)

you can either ground the solenoid, or just rip the thing out and join the 2 hoses (make sure you dont use a joiner that will restrict the hose I.D. otherwise you might get too much boost, ideally use a single piece)

very good, cheap mod to perform on the rb25. :)

leetom Proficient

leetom

Posted
Posted
its called rb25 boost solenoid mod i think.

essentially you ground the solenoid, so its always open (the ecu opens it at 4,500rpm, so you have 5psi boost to 4500rpm, then 7 over that)

you can either ground the solenoid, or just rip the thing out and join the 2 hoses (make sure you dont use a joiner that will restrict the hose I.D. otherwise you might get too much boost, ideally use a single piece)

very good, cheap mod to perform on the rb25. :worship:

why not buy a manual b/c and try ten psi, even better :)

Duncan Grand Master

Duncan

Posted
Posted

mate not a chance in the world anyone would ever notice even if it was illegal...you cut one wire and ground it to the chasis.

the beauty of this mod is it gives you power in the midrange, doesnt affect top end (and therefore should be super safe for the motor). And cost is about 10c...5cm of wire and a eye terminal

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