Jump to content
SAU Community

Recommended Posts

Hiya all :cheers:

If you've seen the "Pushing a mostly stock R33" you'd know where this question comes from.

Anyway, I have an R33 Spec2 and would like to run ~2psi more boost and hold it properly. At the moment I have a GFB bleed valve controlling the boost level, but it bleeds off quite quickly after peak boost is reached - though I know that the Rb20DET turbos seem to run a couple psi higher boost than the RB25DET ones, so theoretically if I used the same boost control they do I should get similar boost behaviour - so wouldn't really need to rely on a bleed valve.

I can get an R32 RB20DET turbo for free, does anyone know if I can use the actuator/actuator spring with the RB25DET turbo? Any thing I should know?

Cheers in advance!

Dan.

Link to comment
https://www.sau.com.au/forums/topic/45390-r32-wastegate-actuator-on-r33-turbo/
Share on other sites

Can you get me an actuator free too??  Im willing too experiment.

Yes they are a straight bolt on.

Haha - I'd love to :) One of my friends blew his R32 RB20DET turbo recently, running ~18psi through it :headspin: This is how I am getting one so FREE, I just happened to think of it when I was pondering how to alter my boost actuation.

How long have you been running 13psi through your stock turbo??? Thats pretty up there...

12-13psi for a good 8 months or more and it gets its fair share of caining.

Im ringing around now to find a R32 actuator, apparently you can bend the rod to put more pressure on the spring.

Yeah, I know about that way around it - but I would rather not :)

  • 4 weeks later...
12-13psi for a good 8 months or more and it gets its fair share of caining.

Im ringing around now to find a R32 actuator, apparently you can bend the rod to put more pressure on the spring.

Update - I have an R32 GTSt actuator on my car now :cheers:

On "stock boost" I am running 10-11psi, seems to come on stronger - feels particularly meaty around 4000-4500rpm. I find it hard to tell if its any better up top, there is definately a LITTLE drop off in the high revs. It will be going on the dyno on the 21st August for a boost and power read out, to see what the difference (if any) really is :)

I bought a HKS actuator and yes still notice some drop off, not as severe though.

Ahh ok - so the R32 actuator is a good (price wise) alternative :cheers: The ultimate would be getting an electronic boost controller then, but the better actuator is going to make its life easier... when I eventually get that sorted.

So you are still getting drop off below 10.9psi?

10.9psi for myself is the stock boost level for the rb20det actuator.

To hold more boost I elongated the actuator bracket holes and pulled the wastegate towards the front of the engine bay.

This preloads the actuator spring and reduces the total travel of the actuator, effectively stopping the wastegate from opening as much.

The result.... boost comes on harder and will hold anywhere up to 1.1bar without a bleeder, if adjusted too much it will get boost creep and make 1.1+bar.

This setup works best with a bleeder to help bring boost up hard in the mid.

The RB20DET's are pretty tough and will hit a fuel cut before you blow the turbo (well mine does at just over 1.1bar). So You drive along with the spanner adjusting. Or you can do it on the Dyno which is much much safer.

I've had it running 1.1bar like this with a bleeder for the last 6 months.

Prior to this setup I was running a Blitz SBC-iD and 1.1bar.

Which one works better and holds boost more consistently?

The bodge job with the bleeder, the EBC held boost well but driving up a hill on load at around 3000rpm and putting the foot down would see a boost spike.

Its cheap.. A Free MOD!.

For the R33 people, I think the best thing to do is get one of these R32 actuators on your car, and then mod the factory bleed solinoid so it's on all the time (there's a DIY thread about doing this).

So you should get the (new) stock boost of 10psi with the R32 actuator, and have the factory solinoid bleeding off to bring it up by 2psi = 12psi :cheers:

Total cost would be just the R32 actuator, and you'd have the benefits of everything looking totally stock standard :)

J

  • 6 months later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • The German place in Cabramatta was rock solid, fresh pretzel cooked to order back then. Then it went all quiet, after all the poker machines were removed, then I believe it closed for good. I did drive past the other week and noticed outdoor lighting a big screen, but no idea what is there now.  
    • Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
×
×
  • Create New...