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boost spike

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chriss4655

Member
Joined
Jan 21, 2009
Messages
224
New te44,rjc boost valve,HD wastegate, running 100% meth,when I go WOT the boost spikes to 25lbs and then settles around 20 to 22 lbs. Is there anything I can do so it just goes to 25lbs and stays there? Thanks:)
 
Are you still incorporating the stock factory boost control solenoid with your setup? Or do you have your lines plumbed like this picture below?

RJCvalve.jpg


The top hose running straight down to your wastegate. Electrical solenoid not functioning. (IE: electrical plug still hooked up, but no vacuum line running to it?)

If you are still running the electrical solenoid in the mix, the chip is commanding the boost solenoid to open and vent some pressure from the line. Which can cause a spike like you're seeing.

On my setup pictured above, the boost would go straight to whatever I had it set for and not spike or waiver. I did not have any lines plumbed to the factory solenoid, just the electrical plug so the ECM won't spaz out and throw a code.

Let us know.

Patrick
 
Ive been having the same issue for a while and am running the same setup as in your pick patrick. It happened on my 6162 and my new 6776. Could the RJC controller be weak? If I want 25 psi I have to deal with a quick 27.5 psi spike.
 
I've been told to use a standard adjustable wastegate valve vs HD in conjunction with the RJC Boost Controller. Would this be a fix for your problem? I believe there are several threads about this on this site and the other too.

Have you ported your wastegate hole to match your puck?

Good Luck.

dave
 
I've been told to use a standard adjustable wastegate valve vs HD in conjunction with the RJC Boost Controller. Would this be a fix for your problem? I believe there are several threads about this on this site and the other too.

Have you ported your wastegate hole to match your puck?

Good Luck.

dave

Using a standard will drop boost at the top of 3rd if you are running any hp through it.
 
Thanks for the reply, I'am plumbed just like the pic.The stock system is not in the mix. One thing I did notice is you have alot more threads showing on the rjc valve. Do you think backing off the boost control valve and then shortening the waste gate rod to get to the same boost level might cure the spike?:p
 
I did a few experiments at the drags last month and I found that if I shortened my actuator rod, my boost would spike to 23 psi then drop to around 19. To fix it, I lengthened the rod, which reduced the spike, but it also lowered the boost thereafter. The second step was to open the bleeder valve a bit more in order to raise it back up. Much flatter boost now. It now spikes to maybe 21.5 and settles to around 20. By the way, I'm running the factory Y with an adjustable bleeder valve instead of the WG solenoid.
 
??

Did you do a radius job on the inside of the wg hole? There is a lot of material that can be removed in the PTE housing. One long time member told me to picture the air flowing up out of the header and having to make that turn through the hole. If you work on that radius turn you'll see most of the improvement in the boost control.

Joe
 
I have a question...

I think i have the opposite issue. At the top of third i am 24 psi but before that it pegs at 22 psi. I have my wastage vacuum hose going to turbo without bleeder valve or solenoid...

Thoughts?
 
Did you do a radius job on the inside of the wg hole? There is a lot of material that can be removed in the PTE housing. One long time member told me to picture the air flowing up out of the header and having to make that turn through the hole. If you work on that radius turn you'll see most of the improvement in the boost control.

Joe

Patrick is this radius thing true?

I'm having the same issue with the RJC controller. I tried to by-pass it (adjusted off rod only) and same issue.
 
Yes, tis true tis true.

picson1810050.jpg


Gotsta port that lip to make it work right on the larger turbos, along with making the hole larger.
Hope this helps.

Patrick
 
spike

Thanks for all the idea's and pic's .Good winter project porting the waste gate hole. thanks again.:biggrin:
 
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