jtalton626
Probationary Member
- 21
- 0
- Jan 18, 2009
-
Yadkinville,
North_Carolina
Good day all,
I don't post on here hardly ever, mainly just read and learn...but I have a question that has stumped me for 3 years.
My car likes to fall on its face right when WOT boost kicks in. You get past 4k on the tach with more than 7 lbs of boost and it falls out. Have tried everything I know of.
This problem has continued through the swap out of the entire motor, including ALL NEW fuel pump, plugs, injectors, rail, filter, cleaned gas tank, ignition coil pack, new ecu, new Power Trans unit, etc.
The only thing I have left that I haven't tried is this.
I noticed a "T" connection connecting the vacuum line from my fuel pressure regulator to my boost gauge. This was installed by the person that owned the car before me. I couldn't help but notice that on the other side of that "T" connection is the VSV, or the Vacuum Switching Valve". Now, correct me if I am wrong but it is my understanding that the VSV is what changes the vacuum pressure going to the FPR and allows your vehicle to get more fuel while at WOT. Am I correct? Because if so, then perhaps when my car hits WOT the the added connection does not allow the vacuum to affect the FPR correctly, which would cause fuel cut.
Now for my secondary question. Assuming my theory is correct, and the vacuum does affect the FPR, then could you not theoretically install a boost controller to the vacuum line of the FPR and effectively make a manual FPR to bypass the VSV altogether? If so, then could you not in turn use a 2 stage boost controller to simply pick when you wanted that extra fuel?
I don't post on here hardly ever, mainly just read and learn...but I have a question that has stumped me for 3 years.
My car likes to fall on its face right when WOT boost kicks in. You get past 4k on the tach with more than 7 lbs of boost and it falls out. Have tried everything I know of.
This problem has continued through the swap out of the entire motor, including ALL NEW fuel pump, plugs, injectors, rail, filter, cleaned gas tank, ignition coil pack, new ecu, new Power Trans unit, etc.
The only thing I have left that I haven't tried is this.
I noticed a "T" connection connecting the vacuum line from my fuel pressure regulator to my boost gauge. This was installed by the person that owned the car before me. I couldn't help but notice that on the other side of that "T" connection is the VSV, or the Vacuum Switching Valve". Now, correct me if I am wrong but it is my understanding that the VSV is what changes the vacuum pressure going to the FPR and allows your vehicle to get more fuel while at WOT. Am I correct? Because if so, then perhaps when my car hits WOT the the added connection does not allow the vacuum to affect the FPR correctly, which would cause fuel cut.
Now for my secondary question. Assuming my theory is correct, and the vacuum does affect the FPR, then could you not theoretically install a boost controller to the vacuum line of the FPR and effectively make a manual FPR to bypass the VSV altogether? If so, then could you not in turn use a 2 stage boost controller to simply pick when you wanted that extra fuel?