Hey all, I swapped bypass valves on my cobra and now it appears to be running lean and is really choppy when holding a steady throttle when cruising down the highway. I went from a bypass valve that I picked up through summit plumbed into the discharge piping that came with the Vortech kit to a Tial bypass valve plumbed into 3" aluminum tubing. Is the bypass valve causing the problem or the fact that I changed all the discharge plumbing???? My boost gauge is showing about 23 on the vacuum at idle and it appears to be idling fine. Don't think I have a vacuum leak, but thought I would mention it. Not sure where its at when cruising down the road. Anyway, my car has been down for about 6 months for a trans swap (yes I drug my feet lol). Should I reload my tune to see if it helps???
Retune after bypass valve change????
- Thread starter yfz162
- Start date
It's your discharge piping.
Well poop biscuits, guess it's time to call Mike Post again lol. Does anyone know if he is still on here???
So you switched from a recirculating bov to an open one?
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No, the Tial set-up is recirculating just like the one I replaced. I talked to Mike Post about retuning the car. Hope that helps....
Ok, so I receive a revised break-in tune from Mike Post and the car continued to run like total crap. I decided to take a quick datalog and discovered zero maf voltage. I pulled my inner fender back and discovered I forgot to plug in my maf connector........lol. The car is running much better now 
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