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Old 07-14-2010, 10:10 PM   #1
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WONT go over 6lbs of BOOST!

So, Heres the story.

Im trying to up the boost on my Roush turbo kit and Im kinda stuck.

There is a 3lb spring in my Tial wastegate. If I run strait wastegate, it hits 3lbs, opens the wastegate, and runs like a champ. Perfect A/R's and everything.

As soon as I up the boost with a MBC, the car just falls on its face! Hits about 6 lbs and about 4k rpm it goes SUPER rich and just bogggggsss. I thought it might be the MBC, however.... Even if I unplug the wastegate and run it with NO vacuum still does the same thing.

Tune is by Randy at FSwerks. (and Ive been very happy so far)(in the process of remote tuning) Im discussing the problem with him now, just wanted to know if anyone had any ideas.

HELLLLLP!! :)


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Old 07-15-2010, 08:27 AM   #2
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well the first problem i see is trying to exceed 6 psi on a 3 psi spring. you are usually only suppose to double the spring pressure of the wastegate

i would start of by getting like a 6 psi spring in there, that way you can actually turn it up a bit. also if your in the process of tuning with randy, unless he asked you to poke around for an answer, i would keep this between you, him and the FSwerks team to sort it out, less confusion
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Old 07-15-2010, 09:46 AM   #3
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Talk with Randy.
You should NOT just crank up the boost on a tune it wasn't designed for.
It's possible you have pegged the MAF and now the tune is guessing the amount of fuel to provide.
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Old 07-15-2010, 09:55 AM   #4
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Well, we already started tuning. He just wants me to do a WOT run now but I cant over 6lbs.



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Talk with Randy.
You should NOT just crank up the boost on a tune it wasn't designed for.
It's possible you have pegged the MAF and now the tune is guessing the amount of fuel to provide.
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Old 07-15-2010, 09:56 AM   #5
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Quote:
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well the first problem i see is trying to exceed 6 psi on a 3 psi spring. you are usually only suppose to double the spring pressure of the wastegate

i would start of by getting like a 6 psi spring in there, that way you can actually turn it up a bit. also if your in the process of tuning with randy, unless he asked you to poke around for an answer, i would keep this between you, him and the FSwerks team to sort it out, less confusion

OK cool. Maybe Ill try to buy a spring first.

-- Cam
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Old 07-15-2010, 10:15 AM   #6
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I donīt think your issue is with the spring, in the past i used a 4lbs spring and turn the boost up to 9psi in low and 16 in high and never had your problem.

If your tune was done with 3psi, turning it up maybe need adjust your tuning.
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Old 07-15-2010, 10:24 AM   #7
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Ok good to know. The tune wasnt MADE for 3 lbs.

Randy just sent me a base tune. I didnt the idle-6000 rpm test. Then he told me it was time for a WOT run. But he said he wanted about 8lbs to start. WEll, I cant even get to 8lbs.

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I donīt think your issue is with the spring, in the past i used a 4lbs spring and turn the boost up to 9psi in low and 16 in high and never had your problem.

If your tune was done with 3psi, turning it up maybe need adjust your tuning.
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Old 07-15-2010, 10:43 AM   #8
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It isnt your spring , contact your tuner

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Old 07-15-2010, 11:04 AM   #9
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THanks Tom

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It isnt your spring , contact your tuner

Tom
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Old 07-15-2010, 12:19 PM   #10
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could it possibly be the boost-a-pump?

Tuner is saying its something mechanical.
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