Do i need 2 manual boost controllers
I have a ball and spring manual boost controller and had it installed a few months ago. And i'm currently running 8 lbs of boost till the second turbo kicks then hit 13 lbs and stays. Any adjustments on the contoller only effects the second turbo. My mechanic says i need another one for the primary. I never heard anybody running 2 manual boost controllers ? Was i suppose to get 2. It kind of make sense since it's hooked up to one waste gate. Not sure if it's hooked up right or i need another one !
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I have never heard of anyone using a separate boost controller for the primary. I am not sure how, or where, you would do that.
A typical 2nd controller would effect pre spool. I would not recommend installing one. |
So the ball and spring controller you have is effecting the wastegate only, right? Likely, then, the restrictor for the pre-spool was removed, but NOT replaced by either a valve or new restrictor. adam and I have both had troubles trying to dial in the pre-spool with manual bleeder valve controllers, though I beleive damien had good results when he used ball and spring (Dawes devices, I think) controllers for both pre-spool and wastegate control. He has a nice write up in the archive section.
What's happening in your case is the primary turbo is spooling to 8 lbs, the unrestricted pre-spool circuit is limiting boost to this 8lbs until 3000 rpms or so, and then all the boost is being transferred to the secondary to pre-spool it. If you were to place a restriction in the pre-spool bleed-off circuit, you will see higher primary boost. HOWEVER, you will likely see a drop in boost at transition, though the ball and spring controllers are supposed to be fast enough that they mostly mitigate the transition drop. Supposedly. Anyway, what I don't know is the reccomended restriction size for the pre-spool. I suspect you will find it here if you search. I think I got that right.... try visiting http://www.autosportracetech.com/RX-7/rx7stuff.htm for more info on turbo troubleshooting! |
Found the sizes for the restrictors at
https://www.rx7club.com/forum/showth...34#post1770334 hope this helps... |
Thanks for the reply's. Still alittle confused in what i need to do do fix this.I thought the pre -spool controller valve was for the transition to keep you from getting boost spikes.I don't ever get boost spikes. I don't even get a drop in boost.
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So i should try changing the pill
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The hose with the pill was replaced with the boost controller. I didn't install this my mechanic did. So you think it's possible that i have the wrong pill size?
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You can run one controller for boost control and another for pre-spool control as adamc stated above, I heard it was tricky getting them set correctly
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Both lines came with pills in them, unless your pre spool came with a nipple restrictor instead.
The boost controller replaces the pill in that line, so there shouldn't be a pill there any more. |
Thanks spurvo for the info,
I starting to make sense after i read your post 3 times. i'll buy a pre- controller and give that a shot. I would like to run 12 or 13 lbs of boost on both turbo's. i do a search to where i can buy one and how to dial it for those results. Thanks again |
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