What are your thoughts on Boost regulated cut outs?
06-05-2007, 01:05 PM
#1
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What are your thoughts on Boost regulated cut outs? I am gonna be shipping my car to a local shop to be rebuilt (Im pretty sure I blew a piston if not more...) and was thinking about having it retuned and maybe put a diff WG spring in it to bring it down to like 10psi so its not gonna beat up the motor so much (cant afford to have it only last 3k miles again, lol).
I think qtp sells a boost regulated cutout and wanted to know your opinions on it...
Regarding :
tune
functionality
cool factor, lol.
Opinions?
I think qtp sells a boost regulated cutout and wanted to know your opinions on it...
Regarding :
tune
functionality
cool factor, lol.
Opinions?
06-05-2007, 01:20 PM
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Originally Posted by pdanrichey
I have a buddy with a TT 89 Fox body that just had regular cut outs that he unscrewed himself.
He took them out to race me, ran an extra 4psi and blew his motor up.
He took them out to race me, ran an extra 4psi and blew his motor up.
I would think if its a constant like it would open at 7 psi that you can tune for it to be consistant...
06-05-2007, 01:23 PM
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Originally Posted by 2000 Tran Zam
Sounds similar to how I prob blew my motor (was tuned with exhuast on, took off exhuast running open DP and ran 2psi more).
I would think if its a constant like it would open at 7 psi that you can tune for it to be consistant...
I would think if its a constant like it would open at 7 psi that you can tune for it to be consistant...
06-05-2007, 01:29 PM
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Originally Posted by cablebandit
ATP was the only folks i know about making boost actuated cutouts and they have ben backordered for 1.5 years
I didnt see it on his website but I heard from someone a while back he did them...
What was your experience with it? Did you see any results?
06-05-2007, 01:30 PM
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Originally Posted by lilbuddy1587
Kinda like this
I might just stick with my single exhuast out the back unless I can get a y fabbed up for not too much more...
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06-05-2007, 01:36 PM
#8
Just use a regular electric cutout so you can control it. Also, what WG springs are in it now? You may not be able to regulate the boost down lower if you are running a 5 psi spring and it's obviously creeping higher than that now. What boost did you see with the controller turned off?
06-05-2007, 02:54 PM
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Originally Posted by NicD
Just use a regular electric cutout so you can control it. Also, what WG springs are in it now? You may not be able to regulate the boost down lower if you are running a 5 psi spring and it's obviously creeping higher than that now. What boost did you see with the controller turned off?
Only boost I ever saw on the car was 13.5 or so when I had the exhuast on, and the 15.5 or whatever you saw when we were on the dyno...
Last edited by 2000 Tran Zam; 06-05-2007 at 03:32 PM.
06-05-2007, 02:55 PM
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Originally Posted by JAvenger007
I hope you had a warranty on that motor. 3k is pretty rough.
Lol, only place that warranties FI setups that I know of is LPE... Im not spending an extra 20k for a warranty, lol.
So nope, Im pretty much SOL.
06-05-2007, 02:56 PM
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Originally Posted by JAvenger007
I hope you had a warranty on that motor. 3k is pretty rough.
I just dont have good luck I guess...
06-05-2007, 03:35 PM
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Originally Posted by 52172
exactly just use and electric one and open it up when you know your gonna get on it. You will not always want it to open when under high boost there are times when the stealth comes in handy.
06-05-2007, 03:50 PM
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Ive ran an ATP cutout with bad results before.
problem is it doesnt' open until you're in some boost so by that time LAG has already taken care of business.... would be nice to have something TPS regulated
problem is it doesnt' open until you're in some boost so by that time LAG has already taken care of business.... would be nice to have something TPS regulated
06-05-2007, 04:26 PM
#16
Originally Posted by 2000 Tran Zam
So would it be two different tunes then... one for open cut out and one for it closed? Thearetically it would require two different boost settings due to back pressure right?
06-05-2007, 05:04 PM
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Originally Posted by Frost
No; a good 2/3 bar SD tune will take care of that for ya.
06-05-2007, 05:09 PM
#18
Originally Posted by 2000 Tran Zam
I wonder why I fried my **** then since I was on a 3 bar SD tune when I pulled my exhuast off...
06-05-2007, 05:39 PM
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Originally Posted by NicD
Just because the fueling compensates in the tune for the additional boost from pulling off your exhaust doesn't mean 91 octane can support almost 16 psi of boost. That's what fried your engine, running too much boost on **** pump gas. The setup was tuned for 12 psi on pump gas, not 16 psi.
I plan on running 91/101 mix at a minimum from now on...
06-05-2007, 05:56 PM
#20
Originally Posted by Tiago
Ive ran an ATP cutout with bad results before.
problem is it doesnt' open until you're in some boost so by that time LAG has already taken care of business.... would be nice to have something TPS regulated
problem is it doesnt' open until you're in some boost so by that time LAG has already taken care of business.... would be nice to have something TPS regulated
Thats the problem with any of the boost vacuum activated cutouts - if you set them to open under boost they are too slow responding. If you set them to open under low/no vacuum they might open when you don't want them to (getting on it but not planning on seeing boost, etc.)
If a cutout is what you want (I prefer a free flowing but quiet exhaust all the time) get one of the electric ones. I would recommend getting the car tuned with them both open and closed so as to make sure its safe.