Stock valvetrain with Kelford cams - causing a bad bog at dragstrip?
#1
Stock valvetrain with Kelford cams - causing a bad bog at dragstrip?
Hey guys. First off I want to give little bit of info about my car.
It's a 2006 Evo 9. Little under 54k miles. Full bolt ons, FP Red, Kelford 272 cams, stock springs & retainers, stock bottom end. Makes ~504/402 on a dynojet with e85 @ ~28psi.. ecu controlled boost.
So the past couple times visiting the dragstrip I noticed after winding out each gear and shifting pretty quick the car bogged really bad, at the bottom of the next gear. It would literally lose all power for a split second.. then kick back in full power(almost like spark blowout or a misfire) obviously hurting my times.
For a while i thought it might be spark blowout. But my tuner said to try shifting earlier just to see what happens. So I took the car down the track and shifted right at 7k (my tuner has redline raised close to 8k i believe). The car didn't bog! however, not winding out each gear hurt my mph and ET.
So my tuner thinks that I need to do valve springs and retainers. He thinks that could be causing the bog issue.
I am curious on the forum ninja's thoughts on the matter
It's a 2006 Evo 9. Little under 54k miles. Full bolt ons, FP Red, Kelford 272 cams, stock springs & retainers, stock bottom end. Makes ~504/402 on a dynojet with e85 @ ~28psi.. ecu controlled boost.
So the past couple times visiting the dragstrip I noticed after winding out each gear and shifting pretty quick the car bogged really bad, at the bottom of the next gear. It would literally lose all power for a split second.. then kick back in full power(almost like spark blowout or a misfire) obviously hurting my times.
For a while i thought it might be spark blowout. But my tuner said to try shifting earlier just to see what happens. So I took the car down the track and shifted right at 7k (my tuner has redline raised close to 8k i believe). The car didn't bog! however, not winding out each gear hurt my mph and ET.
So my tuner thinks that I need to do valve springs and retainers. He thinks that could be causing the bog issue.
I am curious on the forum ninja's thoughts on the matter
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#12
Im having the exact same problem. Im making 371 on a stock block and turbo setup with a spoolinup COP and bpr8pes plugs gapped to .2 so im very curious as to what this could be
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