Having boost control issues-need advise

[ZavzTy547]

Searched and didn't quite find the answer I was looking for....

I'm having trouble holding solid boost at WOT.
On a T-18 The chip is commanding the correct boost at launch but I noticed in second and third gear the boost will settle to 13 psi and stay there, no matter what setting I have it on.

I'm not sure what's causing this, selonoid maybe? Would a manual boost valve help keep the boost solid? I already have a stiffer actuator spring...

Thanx

 

[ItsMyTy]

get a scantool.. see if you're getting knock in the higher gears. i'd bet that's why the boost is dropping down.

 

[SeattleSy#1255]

try an external gate buddy! check your email tonight by the way

 

[bryan]

I was wondering if anybody has tryed the import boost controllers? Like Apexi AVCR. I was thinking of trying that.

 

[nick041881]

not sure about use for syty, but i have seen great sucess with a manual boost valve on a turbo mr2. i say try it, you can get them on ebay for like 20 bux...i think it will work.

 

[ed hess]

GET A REAL BOOST CONTROLLER LIKE THE INNOVATIVE MSBC.

knobs give you a guestimate.

what you see on the controller is what you get!

ed

 

[kwick6]

Hey Zav,

Did you adjust the wastegate arm and actuator rod so there is an overlap? That is really important, if you've never done that, I'd start there.

Here is a pic to show what you want to see.

http://boostvalve.com/tech/wg-preload.html

You want the overlap to require you to pull out the actuator rod so that it puts more pressure on keeping the WG shut.


I wouldn't waste any money on a fancy boost controller, the stock turbo setup will never give you good control.... unless you go to an external WG.

 

[Wes]

Get an electronic controller. Blitz is very nice.

 

[SeattleSy#1255]

i don't understand how a nice boost controler will sovle the stock setups crappy boost control...why not go with an external WG such as the mini gate to solve the boost issues.

 

[Matthew Little]

boost

boost

Alot of the issue is wastegate port size and low wastegate acuator pressure(5 lbs). Getting the nicer full active setup controllers will help to try to over come some of these issues, but the higher the boost the less control that stock setup is going to have.

 

[ZavzTy547]

OK.
I reajusted the wastegate arm and actuator rod so there is an overlap.. no change. No knock at 2-3 gear ((used a scantool). Base boost is at 10-PSI with the selonoid discoed (showing 13.9 volts as well) . Checked for vac leaks. My waste-gate duty cycle is 99.4% at idle, maybe that could the issue. Took off my blowoff valve and used my old hard pipe and the results are still the same.

Based on a two hour search, I've found that the only real way to get descent boost from a stock turbo is to port the wastegate. which I'm not really looking forward too doing since you have to take off the turbo (might as well upgrade the turbo for all that trouble).

I've decided to just eliminate the ecm controlling boost from the equation and go with an external as advised. Thanks for everyones replies.

Scott do you still have the stock crosspipe with a minigate?
By the way congrads on the SY!

 

[kwick6]

Scott do you still have the stock crosspipe with a minigate?
By the way congrads on the SY!

thanks, just need a bigger garage.

I put a PTE turbo on, but I think most of the guys using the minigate are happy with it. Just be prepared , its much louder.