Hi !

Anyone has ideas on how to improve the prespool ? Currently my boost pattern is 12-8-12 and would like to get it to 12-10-12. My setup is in the signature.

Thanks!

 

I have the same problem. I'm going to change the size of the pill for the prespool and see what happens. I don't have time for a few weeks so maybe you could try it and let me know how it goes.

 

Hmm.. I would need to insert a pill with smaller diameter, right ?

 

Larger.

 

Cruiser, I've been warned not to run a M2 type ECU on higher boost without another form of boost control. That profec B (first reply) doesn't work at all in solving this problem? guess not as it only controls the wastegate actuator. But if you want to go with a boost controller (electronic) I recommend the AVCR as you can control both wastegate and precontrol actuators.

 

what size pill did you use? did you use holley carb jets or did you drill out the stock precontrol pill?

what's your pattern now after changing the pill?

mine's actually lower primary than secondary and transition is like 8 psi. something like 12-8-13.

when i set my profec on low, it's 10-8-10.

well, thanks!

~mor

 

What are holley carb jets ? Any pics ? How do they differ to pills ?

 

You can use them to replace the pills. They're pretty much the same thing.

They come in different sizes, really close to our stock pills.

 

So the pill is to blame ? Any second thoughts ?

 

I would imagine there is some trade off to increasing the transition (i.e. laggier boost). I can't see it as being a "win-win" modification.

 

Isn't 12-10-12 normal boost pattern on setups that I use ?

What did others do to get 12-10-12 instead of 12-8-12 boost pattern ?

The power loss is very noticable

 

I have not replaced the pill in the prespool line. Replacing it with a larger capacity pill should technically increase your transition boost. In the real world, that might not happen. I tried to use a manual boost controller in the prespool line with no success. After trying for a month to get it right, I gave up and put the old line back in. Now I have a 12-8-12 boost pattern that is not perfect, but still pretty good. My boost drops to 8, then immediately comes back to 12, and stays there.

 

Like mine

I guess I'll live with it or hope for its gone once I replace my vacuum lines

 

The problem is, it's not a malfunction. The transition isn't "2 PSI less than the max boost" no matter what max boost is. That's what getting you confused. The transition is 8 PSI unless you start messing with the pre-spool. Then, you'll probably have a lower primary. I've seen people raise the transition area, but they lose something somewhere else. It's just the way the system works.

 

Oh

Maybe I've been mislead with the "I get/got perfect 12-10-12psi boost pattern" statements on the board.

 

Don't believe everything you read here....

What message thread was talking about a 12-10-12 boost pattern?

 

https://www.rx7club.com/forum/showth...ghlight=121012

This is the first one I clicked after putting 12-10-12 into search

 

lol, and you notice therea aren't more threads around about it (and those people aren't on the forum much). IMO, a stock car doing 12-10-12 means the gauge is off.

 

Ok.. now I know that

Damn... the power loss at transition is really apparent though. I better keep it in the revs, but before that I need to fix my rpm gauge

And maybe see if I can do something wiht the tranny... if I rev past 7k I find it hard to shift fast from 2nd to 3rd...

FD really do keep you busy