Bypass valve gone bad???

60sec_assassin

60sec_assassin

SLOWER than few...FASTER than most!
Just had this happen about two days ago. First i noticed loss of boost pressure so i changed out both the belt and belt tensioner. Still at about 6000 rpm I'm only seeing 4-5psi of boost when the car is set for at least 9.5psi(my normal boost at that rpm) also i've noticed this loud like popping or flapping noise from under the hood while at full throttle, is this the bypass valve doing this? Normal in-town driving if fine, no sluggishness and no noises from under the hood. I have a DR air-to-air vortech s-trim if this info would help or if others out there with this set-up have seen this before.:confused: Full throttle, 3psi boost, loud popping on driverside under the hood....:confused:
 
I suggest you give Dennis a call. There may be procedures he can advise you to narrow down the possibilities, 1-904-276-5003.

Regards,
 
Another member here told me that these valves go bad after about three years. Mine's still running strong, but apparently he's seen one fail on his father's Vortech-charged Mustang. You can order them directly from Vortech or I'm sure DR can get you one.
 
60sec_assassin said:
Just had this happen about two days ago. First i noticed loss of boost pressure so i changed out both the belt and belt tensioner. Still at about 6000 rpm I'm only seeing 4-5psi of boost when the car is set for at least 9.5psi(my normal boost at that rpm) also i've noticed this loud like popping or flapping noise from under the hood while at full throttle, is this the bypass valve doing this? Normal in-town driving if fine, no sluggishness and no noises from under the hood. I have a DR air-to-air vortech s-trim if this info would help or if others out there with this set-up have seen this before.:confused: Full throttle, 3psi boost, loud popping on driverside under the hood....:confused:
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Call me I will help if I can
 
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Zack said:
You are not a vendor, :nono:
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Yes this is true Zack and edited the post, but people can call me for help especially if they have my kit on the car, and you are no longer a SCT dealer and SCT shut off your dongle. So I understand your frustration. I hope every one has a good weekend in its rained here for ten days.
 
Changed out the bypass but still no change, same problems...may have to make a trip to Florida to have Dennis look at it.
 
Sounds like spark blow outs. Bad bypass valve doesn't make loud popping or flapping noise while under WOT.

How old are your plugs and what are they gapped at?
 
Think I've tried all the above so far, changed out all plugs and reverified the gap and traced every inch of hoses and vacuum lines...still same result. I plan to get it back down to Dennis this Friday to see whats going on:confused:
 
I'm the guy Scott is talkin about.

It turns out not only did the bypass take a crap but because the bypass did the car ran REALLY rich and fouled the plugs too.

Make sure the gap is about .030-.032
 
I am having almost the exact same issues....

Please let me know what you find out.

I just replaced my plugs and cleaned the TB and MAF.

I cleaned the IAC last week. I have a new belt, tensioner and all 3 idler pullies...
 
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My guess for both of us is a bad COP, it happened to me before and results in a loss of power, an the car runs just a bit rough...

I took it to a shop, they scanned it and said the car had no codes and that they thought the car ran great...

I am going to change mine tonight. I just did the plugs yesterday.

The only other thing it could be is a bad fuel pump.
 
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