cameron4776

I have a greddy Profec b spec-II boost controller, and it lets the boost rise through rpm. I'm on stock internals and I WANT to be around 6psi. In high rpm it lets it get up to .60 bar. This could also be a wastegate problem, but im not sure wat to look for. (I have a 38mm tial)

Thanks

SpoolnG2

First of all, what spring is in the wastegate? As far as what psi its rated for.

cameron4776

Im pretty sure a .5. The thing is I just tuned it, and now it does it. But before I tuned it didn't do it. Before it wouldn't go above .46 bar.

SpoolnG2

Well, if its a .5 bar spring in your wastegate then according to calculations it should be able to reach 7.35psi with that spring.

1 bar = 14.7psi

.5 x 14.7psi = 7.35psi

cameron4776

But I don't want it to get up that high. I want it to stay round 6psi. Its went up to .60 bar a couple times.

SpoolnG2

OK, well if you dont want it to get that high then put a smaller wastegate spring in your wastegate. You have to realize that whatever spring you have in will be the least amount of boost that you will be able to run. So in this case 7.35 psi is the least amount you can run.

140sx

Turbo-LS

iTrader: (4)

Not to mention that generall what the WG spring is rated it goes a little over. And you can run plenty over 6 psi with stock internals. But liek spoolng2 stated just get a lower spring like 3.6psi and then you have the greddy to up it to 6psi. I just dont see the reason for running that expensive greddy boost controller for 6 psi of boost. ???

cameron4776

I have intensions on building the engine soon. So I went ahead and got it.

Sr420Det

What kind of turbo manifold do you have. I was thinking the same thing on the boost controller why do you just unhook it.

cameron4776

I have neukin ramhorn. Yeh someone told me to cut it off. But I like watching the gauge on the controller cause its really precise.

supraccordlx

psi means nothing, its hp when you start seening failure in engine rates. Different turbos make different power at the same psi rate. If your make over 250 hp on 6psi which I doubt, then your not going to see failure in your motor if its TUNED right. If your that worried about it that much just put a smaller wg spring and you will have nothing to worry about.

dpetro1

what r the settings on the boost controller?

If you want to stay at spring level then set=0 gain=10 and set gain around 30 should work well.

TurboB16A300Hpteg

any one ever think of to low psi on that manifold?? causing the Psi to creep up exp with a 7 psi spring in it.... seen it tons of times.. where people running low boost and the wg creeps on mani's like the ram horn.... like everyone else said change the spring then try it (iv had a Stock 87 Crx with a d15A3 at 10 Psi) held up awesome n ran 14.00s on street tires had a Garret t3 Super 60 On it

cameron4776

I turned the controller off. It still reads the boost and every thing. Lately it it has been staying round 7 psi. I just want my engine to last a good while

tannerLSt

your engine should last plenty long @ 7psi.... 6psi and 7psi isn't gonna make that much of a difference....

at least it isn't doing what my car was doing . i had a 13psi spring and it was creeping to 20psi.... LOL until i got a bigger wastegate and modified the manifold

dpetro1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cameron4776 &raquo;</TD></TR><TR><TD CLASS="quote">I turned the controller off. It still reads the boost and every thing. Lately it it has been staying round 7 psi. I just want my engine to last a good while</TD></TR></TABLE>

so turning off the boost controller stabilized the boost? that means the controller is hooked up incorrectly or the settings were incorrect. properly set up that EBC can really help spool time. you should get it working properly

96 GSR-T

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboB16A300Hpteg &raquo;</TD></TR><TR><TD CLASS="quote">any one ever think of to low psi on that manifold?? causing the Psi to creep up exp with a 7 psi spring in it.... seen it tons of times.. where people running low boost and the wg creeps on mani's like the ram horn.... </TD></TR></TABLE>

my Neukin wont hold 15psi with a Tial 44mm, creeps to 20psi throughout the RPM range.

HiProfile

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cameron4776 &raquo;</TD></TR><TR><TD CLASS="quote">I have neukin ramhorn. Yeh someone told me to cut it off. But I like watching the gauge on the controller cause its really precise.</TD></TR></TABLE>

If you were going to build the engine soon, I'd say leave it on, get a lower-PSI spring, then get it working right. But 'soon' should mean it will be built & running within 1 month. That never happens unless its a sponsored race team; therefor, take it off and run off the spring.

What I really have issues with is people who require such accuracy with something like a boost gauge. Boost gauges are supposed to give you an idea where boost is at, and if something is wrong (overboost or no boost). If you want an accurate boost gauge, get one with a digital display and an electronic sensor. Don't use a deactivated boost controler. And definately don't be romping on the car with your eye always on the gauge.

RCautoworks

Check the hole inside the manifold where the wastegate bolts up, I remember awhile back they were cutting them a tad small and this was causing some creep. I think they fixed the problem but if you bought one used that could be causing an issue.

96 GSR-T

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RCautoworks &raquo;</TD></TR><TR><TD CLASS="quote">Check the hole inside the manifold where the wastegate bolts up, I remember awhile back they were cutting them a tad small and this was causing some creep. I think they fixed the problem but if you bought one used that could be causing an issue.</TD></TR></TABLE>

Mine is coming up on 3 yrs old and I am the origional owner, I remember looking in there prior to install and the hole looked jagged but was the same size as the flange. I am glad I am running E85 as trying to keep my motor together with a T67 on 93 pump creeping to 20psi would be interesting.

agrn93ls

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpoolnG2 &raquo;</TD></TR><TR><TD CLASS="quote">OK, well if you dont want it to get that high then put a smaller wastegate spring in your wastegate. You have to realize that whatever spring you have in will be the least amount of boost that you will be able to run. So in this case 7.35 psi is the least amount you can run. </TD></TR></TABLE>

X2

To the OP... unless there is something I dont know about electronic boost controllers, there is no way you can run less boost than the rated spring in the waste gate