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-   -   boost problem, fixed..! (https://www.rx7club.com/2nd-generation-specific-1986-1992-17/boost-problem-fixed-176279/)

J-Rat Apr 13, 2003 09:58 PM

boost problem, fixed..!
 
I was having problems with my boost. It would shoot up to 8 PSI then fall off about 5-6000.

So I wired my twin scroll actuator open.

WOW!! just hit 10psi all the way to the redline. Good lord!

Jarrett

gsracer Apr 13, 2003 10:15 PM

say goodbye to your spool up time. I removed the twin scroll on an extra turbo I had and evn with a MBC I don't get full spool till like 4k :eek:

J-Rat Apr 13, 2003 10:23 PM

Spool up time is still amazing! Im spooled by 2500.

Blowtus Apr 13, 2003 10:33 PM

how did you wire it open?

gsracer Apr 13, 2003 11:12 PM


Spool up time is still amazing! Im spooled by 2500.
bitch! Maybe this turbo is just old and tired, I'm swapping back on the other turbo since I just got done porting the wastegate on it.

PJ-4.2L Apr 13, 2003 11:17 PM

Good to hear that you at least know where the problen resides. BTW, I am not bringing the Rex with me to Tucson (I will be there this week) so I won't be stealing that tranny from you.

Catch you later!

PJ

BlackRx7 Apr 13, 2003 11:25 PM

with my ported motor I get full bost by 2k but it starts fallinfg off by 5500 rpms....

J-Rat Apr 14, 2003 12:10 AM


Originally posted by BlackRx7
with my ported motor I get full bost by 2k but it starts fallinfg off by 5500 rpms....
that was my problem till Iwired the scroll actuator open.

J-Rat Apr 14, 2003 12:11 AM


Originally posted by Blowtus
how did you wire it open?
Safety wire... Resists heat.

Jarrett

RexRyder Apr 14, 2003 12:54 AM

um, could u explain pls j-rat?

Blowtus Apr 14, 2003 01:03 AM

Just out of interest (mainly to confirm the system was working properly) I did basically the same thing, but just pulled the green actuator doover the vac hose connects to. Boost came in later, and no difference in the top end, on a stock t2 with mild exhaust. Probably old news to plenty of people, but hey ;)

dr0x Apr 14, 2003 01:08 AM

Rex: go find a coat hanger. Disconnect the actuator from the twin scroll arm, take hanger and hook the arm up to something so it stays open. Done (ghetto, but done :) )

SonicRaT Apr 14, 2003 01:12 AM

It's about time you got around to fixit it, you've only been complaining about it for the past week!

J-Rat Apr 14, 2003 04:43 AM


Originally posted by RexRyder
um, could u explain pls j-rat?
I disconnected the actuator arm from the manifold arm. Then I ran some aircraft safety wire from the actuator forward. That keeps the actuator open. I can provide pics tomorrow, its too late now.

Jarrett

J-Rat Apr 14, 2003 05:15 AM


Originally posted by SonicRaT
It's about time you got around to fixit it, you've only been complaining about it for the past week!
Whatever.....:rolleyes:


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