High Boost Problem??

[frontside]

I installed a TURBOSMART dual stage manual boost controller on my rb20 powered R32 Gts-t over the weekend. I have everything connected properly.. or so I though until I went out to set my high and low boost levels. I took my car down a long straight road, turned both the high and low knobs all the way off, got my care into 3rd and gave it a pull. I was making 15psi of boost with zero adjustment on my manual boost controller?!

I though maybe the boost controller had failed on me at some point but that's not the cause because I turned up the low level knob 2 turns and gave it a pull...Got past 15psi so I let off quickly. So its working... Just not sure why my lowest level is sitting at 15psi??!



Any Suggestions?

[94typem]

Had the exact same problem with a Turbosmart boost tee i put on my R33 Gts25t. Couldnt figure out why but i just got tired of messing with it so i hooked up a AEM Tru Boost electronic boost controller and that was that.

[derbeck]

I'm not to sure on rb20 but on 26 the boost lines run from actuators to manifold to controller. So you have to remove the manifold pressure for it to work correctly

[frontside]

Had the exact same problem with a Turbosmart boost tee i put on my R33 Gts25t. Couldnt figure out why but i just got tired of messing with it so i hooked up a AEM Tru Boost electronic boost controller and that was that.

Ahhh.. Didn't wana hear that haha. What all did you try?? Im starting to wonder if it's the way I set it up, I ran some lines pretty long. Shorter the better??

Or my wastegate actuator could be stuck or jammed??

[Ghost]

I have the same setup in my GTsT, and yes, that is the way it is... i was worried as well when i set it up cause at one point a hit 22 psi (yikes) but at the lowest setting it'll give around 11-12 psi with a 14-15 psi spike... you wont hold at 14-15 WOT just to let you know, it'll drop off down around 11 range. Hope this helps...

It's the same with the boost tee as well...

[frontside]

I have the same setup in my GTsT, and yes, that is the way it is... i was worried as well when i set it up cause at one point a hit 22 psi (yikes) but at the lowest setting it'll give around 11-12 psi with a 14-15 psi spike... you wont hold at 14-15 WOT just to let you know, it'll drop off down around 11 range. Hope this helps...

It's the same with the boost tee as well...

Yeah I noticed the spike and how it dropped. But still.. 15psi? even for a second or two isn't that pretty hard on the engine? When I took it out for a couple pulls the engine was sooo hot! I know exhaust temp goes up as boost pressure goes up.. but didn't think it would be that hot..my engine sounded like a bowl of rice crispies when it was cooling down lol. Probably should up the tuber timer time.

How long have you had your boost running like that? have any issues so far? Have you tried removing the internal ball and spring from the dsdc tee peice (the part w/ wastegate arrow) to reduce spike?

haha sorry for bombing you with questions, I just need to get down to the bottom of this asap cause my cars going for paint monday!!

[Ghost]

Had the boost running like this for about 2 months. I don't drive this car hard so i really don't hit around 11 psi very often anyways. I have pushed the car hard, maybe, 3 times since i got her on the road and had no issues with the brief 14. I've considered removing those parts but i didn't see a point cause i'm not in those boost levels very often, and the only time i see it hit around 14-15 is at WOT, and it's very brief (aprox 1 sec) before it drops down to 11 again. Usually at half throttle it won't go past 11, and thats where my foot usually stays. Also removing ball and spring, to my understanding, is supposed to eliminate spike and even the boost curve and help with sustaining it an a more even level. I wasn't about to try to play around with this in case it hit and sustained around 1 bar.

!5 PSI not hard on the engine, but because these turbo's are ceramic it's more danger to the turbo. Most likely (in that high boost in great frequency) the exhaust wheel will eventually break. So if your WOT hitting 14-15 alot, yeah chances are you'll blow the turbo, more danger of doing that if your sustaining 14-15. Until you can get a hold of a better replacement/upgrade turbo ie: one with steel wheels or better yet a full steel turbo, just keep an eye on your boost gauge and make sure your not sustaining 1 bar+... or you can go the route other have and get an electric one to control it on a more precise level. But the odd spike should be to much to worry about.. just don't crank it any higher.

My turbos fine, no noises, spools great. But then again i don't run around everywhere top speed top boost all the time.

[94typem]

I tried taking the ball and spring out of it, running different lines, i even straight lined it from the intake pipe to the actualtor but then it just ran stock boost so i just got fed up and hooked up an electronic one and now its perfect.

[frontside]

Problem solved! Took out the ball and spring, runs perfect now. Zero boost spike and holds desired boost level.