Problems with Vortech supercharger backfeeding

[SS EATR]

I have a 1997 Cobra with a vortech supercharger and I am having issues with backfeeding back through the mass air flow. It has a brand new aftercooler set up, and also just added a second bypass valve because that is what vortech said to do. It also has a new SCT 2600 MAF. I have a v2 s trim running 10 psi. If anybody has any idea please let me know on this thread, by p.m., or you can call or text me at 434-865-5406.

[NakMan]

SS EATR,

What you're describing sounds like "reversion" and my Vorteched '96 Cobra had it bad with an 83mm Pro-M meter, dual Vortech Mini Race Bypasses, and AFM Power Pipe.

The Power Pipe was even modified to take the outlets of the bypass valves and exhaust them just before the rubber elbow that entered the blower. Still, enough air went backwards through the MAF that it caused surging on the highway and really bad bucking at low throttle settings (like trying to follow slow-moving traffic).

I put in an 85mm Abaco MAF, and the problem went completely away.

Before you get excited, my first Abaco failed completely on the dyno while tuning was being done, and was replaced under warrantee. The second meter also failed but was able to be reprogrammed and seems to be OK. It's like it just lost its programming. I'm not impressed with the reliability which is frustrating since the meter performs so well with regards to driveability.

Nak

[GMundertaker]

I am likely soon going to have my abaco meter for sale if you might be interested. It is a DBX97MM.

PM me if you are interested,

Matt

Interesting thread by the way I had never heard of this happening.

[SS EATR]

Originally Posted by NakMan

SS EATR,

What you're describing sounds like "reversion" and my Vorteched '96 Cobra had it bad with an 83mm Pro-M meter, dual Vortech Mini Race Bypasses, and AFM Power Pipe.

The Power Pipe was even modified to take the outlets of the bypass valves and exhaust them just before the rubber elbow that entered the blower. Still, enough air went backwards through the MAF that it caused surging on the highway and really bad bucking at low throttle settings (like trying to follow slow-moving traffic).

I put in an 85mm Abaco MAF, and the problem went completely away.

Before you get excited, my first Abaco failed completely on the dyno while tuning was being done, and was replaced under warrantee. The second meter also failed but was able to be reprogrammed and seems to be OK. It's like it just lost its programming. I'm not impressed with the reliability which is frustrating since the meter performs so well with regards to driveability.

Nak

Awesome thanks for the info, he is gonna try going up a pulley size today and see if it effects anything, and a guy from vortech said he had the same blower and same problem and had to go with a race bypass so im gonna try that if the bigger pulley has no effect and if that doesnt work ill get the mass air you had to go with.

[Ski-Dad62]

When I was originally in draw thru I had backwash issues on my MAF - traced it to the discharge from the bypass valve striking the powerpipe at 90* and backwashing toward the MAF rather than toward the impellers

Here's a before pic - note how the piping for recirculation was at 90*



The fix was to angle the piping angle so it faced more toward the impeller - that fixed the issue





Then later switched over to blow thru - lol