Boost creep continued..

[hottscennessey]

I made a post a few months ago about my problems with boost creep. It's been a huge struggle for me. My boost quickly rises to 15 psi, and then slowly continues to rise. This is on a SP61GT.
So far, I've..

-tested the actuator.. its somewhat finiky. I sent it back to SP and they sent me a new one. It honestly looks like they just painted it black and sent it back, but I know they are a reputable company.

-tested the movement of my WG door.. No problems, even grinded away at downpipe flange

-checked for leaks- none. period.

-checked for ruptures in the actuator diaphram. None.. holds boost great.

-Ported the wastegate and flange material of downpipe. I mean I took off a LOT of metal, a good 3 hours of work. I also polished it.


That was my last bet.. what can I do now? This is really driving me crazy because I want more boost but I'm afraid of more creep. I'd contact SP again but it took them over a month to return me a new actuator.. which BTW did no good at all.

:1zhelp:

I'm on the stock manifold for the ease of a bolt on affair.. but now with this problem it keeps me from getting an external WG.


BTW this is not a thread about me bashing SP, or their service, I just want my WG to funtion like everyone else's. I'm sick of having my car down for stupid stuff so I'm just extremely frusturated.

 

[Bishop92t]

What intercooler and exhaust are you running? Are you running a boost controller? What method did you use to test for boost leaks?

 

[hottscennessey]

I'm running a maxx autoworks FMIC w/ 2.5" hardpipes. I have a 3" exhaust, gutted cat, and cooleze 3" downpipe (widemouth type). I'm running an EBC with no gain or any settings.. duty is set to "off". I used an air compressor and a gauge to test for boost leaks.

 

[hottscennessey]

I don't know if I should contact SP and ask for a different actuator.. maybe w/ a 7psi spring.. or does it sound like its not the actuator and that solution would be a still-creeping-band-aid?? Any help with this topic would be MUCH appreciated.

 

[Bishop92t]

Disconnect the EBC from the actuator to see if it makes a difference. Depending on the EBC type and how it's hooked up, it's possible for it to create a problem. The gutted cat could also be a problem, try running just the downpipe.

 

[malloynx]

you shouldn't be creeping. i ran the SP61GT on a 3in CRUSH-BENT exhaust and made over 400rwhp at 20psi.

keep it simple stupid K.I.S.S (not dissing you)

ditch the EBC. get you a nice 30$ joe p MBC and never look back. i threw my EBC in the trash. that is how much i hated it

 

[hottscennessey]

first of all, thanks for posting.. as clearly as I can remember I had the creep even with no boost controller.. and with my MBC. I'll surely check again because a lot of the simple things are commonly overlooked.

Bishop, I'll try running open downpipe, I'm desperate and its definately a good suggestion.

Malloy, lol EBC's are a PITA, I miss the easy adjustment of my MBC, but I love my EBC.. Blitz SBC-ID III. Its just so sexy. We'll see if it likes me as much later tonight.

 

[suprahero]

I'm having the same problem hottscennessey. I just dynod at 406 rwhp @ 18 psi. with no bc. It took a while to boost that high, but it just keeps climbing. I had a turbo xs mbc on it, but it wouldn't hold. I had it set for 13 psi, but it would just go right on past it. I then bought the turbo xs high performance dual stage mbc. Same thing. It wouldn't hold the boost. I was told I may have harmed the diaphram by putting boost to it with an aircompressor. The guy that built my turbo said that it could be the wastegate actuator or even the wastegate is creeping open. I don't know much about turbos, but mine doesn't spool like it did a few months ago. It used to spool fast and kick you in the back seat. Now it has no kick at all. I would have thought that it would dyno at about 200 rwhp. instead of 400. Please keep me posted on anything that you find wrong with yours and I will do the same. Thanks and good luck with your problem.............lol


Edit: My turbo spools great, it just doesn't feel like the motor is receiving all the air that it is making. My boost gauge saids I'm getting 15 normally, but it feels like 5psi.

 

[hottscennessey]

well I didn't get to work on the supra tonight, girlfriend time.

Suprahero, I have a few questions for you. What turbo is it? Internal or externally gated? What PSI actuator/spring?

 

[suprahero]

Hey Hott.......I just made a thread about my turbo. I have a garrett to4e with 50 trim. I don't know if that is good or not, since I'm not a turbo expert. I do know it spool pretty good and spools alot. It has an internal wastegate and it's suppose to be set at 14 psi.

 

[Bishop92t]

So long as you put regulated pressurized air on the wastegate it should be fine, also provided you didn't put too much pressure on it. You could eliminate the actuator as your problem if you've got a good compressor regulator, give it whatever pressure that it's supposed to fully open at and see if it moves any after a little bit of time. SP should be able to test it for you...actually that makes me wonder did they happen to say if your old unit was broken?

EBC's can be a pain at first, but once you learn them they are far superior in control. A good EBC could actually reduce or remove a boost creep problem.

 

[hottscennessey]

I honestly still feel like the actuator could be causing the problem.. SP tested my old actuator and told me it was reading inconsistantly. I installed it without testing it, still had problems and it tests just as erratically as my "last" actuator.

I was thinking the same thing about the EBC.. It SHOULD help if i "tuned" or.. i guess toyed with the EBC. If I were boosting 20 PSI then the response would be better.. causing the WG door to instantly swing open as soon as the EBC permits.. if it still boost creeped from that point I could probably turn down the duty cycle? I dont know too much about them, I havn't had a chance to toy with it yet, but is this along the lines you were talking Bishop?

 

[suprahero]

Thanks Bishop. What kind of ebc are you using? I'm thinking about the avcr or the greddy profecb. Those seem to be the most popular. Also, what bov are you using? Their seems to be alot of people on here with the HKS bov. I have the turbo xs. Just thought I would ask while I had your attention. Thanks

 

[suprahero]

I honestly still feel like the actuator could be causing the problem.. SP tested my old actuator and told me it was reading inconsistantly. I installed it without testing it, still had problems and it tests just as erratically as my "last" actuator.

I was thinking the same thing about the EBC.. It SHOULD help if i "tuned" or.. i guess toyed with the EBC. If I were boosting 20 PSI then the response would be better.. causing the WG door to instantly swing open as soon as the EBC permits.. if it still boost creeped from that point I could probably turn down the duty cycle? I dont know too much about them, I havn't had a chance to toy with it yet, but is this along the lines you were talking Bishop?

What type of ebc are you using? I don't have one yet, but I'm wanting to get one that doesn't take an act of congress to operate..............lol

 

[hottscennessey]

What type of ebc are you using? I don't have one yet, but I'm wanting to get one that doesn't take an act of congress to operate..............lol

Mine seems straight forward.. as was the install. Its the Blitz SBC-ID III.

I like it.. nice warning features.. good boost gauge. Easy to use from what little bit I've used it.

 

[suprahero]

Does it have two settings or just one? Do you run it at 18 psi all the time, or can you lower it to about nine for daily driving and then swithch to 18 when some da wants to mess with you? It looks pretty simple to use and that's what I'm looking for as long as it works........lol

 

[Bishop92t]

I'm using the GReddy Profec e-01 and HKS SSQV. It would be a bandaid to use it to remove your boost problems, but so long as it netted steady boost it shouldn't be a big deal. The e-01 definitely isn't the easiest boost controller to operate, but it's about the same difficulty to tune as most piggyback air/fuel computers.

 

[hottscennessey]

Does it have two settings or just one? Do you run it at 18 psi all the time, or can you lower it to about nine for daily driving and then swithch to 18 when some da wants to mess with you? It looks pretty simple to use and that's what I'm looking for as long as it works........lol

It has 4 settings. 18 Psi was just as much as i let it creep at that time. lol. thats the peak display feature. Unfortunately with an EBC or any BC you can't lower the boost beyond what the wastegate spring will allow. I really need to stop procastinating and solve this problem.. I went to the beach today. blah, I'll get to it, i promise. lol

oh and Bishop, at this point I'd be happy about a band-aid, as long as it worked. I'll definately give my EBC settings a shot.

 

[suprahero]

Come on Hotscennssey, stay away from the beach and focus.............


Hopefully when you get yours fixed, mine will be similar. I've got a few things to try that IJ told me to do in my thread about this same problem. If it helps I will update you..................lol

 

[hottscennessey]

haha thanks, I've been following you're threads too. I've got a month to work on it before my 1 year warranty runs out at SP, at that point if i havn't fixed the problem I'm gonna try the lower Psi actuator.