01MGGT

Ok so we are still working out the tune but I was curious about something, I have been having surging/hesitation at WOT while trying to get the boost up. With my mods what are the chances the bypass valve isn't up to snuff? It's brand new and is the little plastic bosch that comes with the vortech kit. The car will start to pull hard then kind of hesitate and then pick up again and it kind of goes back and forth. I am going to throw some tr6 plugs in there gapped at .34 and see if that helps as I left the stock plugs per the vortech install instructions. I am on a pretty rich tune and tend to be around 11.0 or a little richer. Third gear is the worst....it it's like on the boost gauge it will climb to like 2 psi and back down then jump up some more to maybe 4 or 5 psi and so forth. I can't find anywhere it would be leaking. I even moved the vacuum for the bypass to several places with no luck. Everynow and then the stars will align and the car will run like a damn raped ape!

tbirdscwd

Put a colder plug in there. Not worth the risk of detonation under boost, trust me. If your A/F is at 11.0:1 then you are getting plenty of fuel and doesn't sound anything like a fuel pump problem, but it's worth datalogging your rail pressure. It's possible your bypass isn't working properly, or you might be blowing the spark out on those stock temp/gapped plugs once you get into boost. You need to have those things like you said in the .034-.032" range. You might also be detonating. What does your tuner have your spark borderline table set at above 2500 and 80% load? What octane fuel are you running?

The chance of your bypass not being big enough are 0, because it close normally no matter how much pressure you are running. The problem you will run into when you get into more pressure is that when it opens after WOT, it will not vent the pressurized air fast enough. You would notice this after WOT not during.

Also posted on MM

ShadowDrake

If your boost pressure is surging up and down when you hold the throttle WOT maybe the belt is slipping, or your tensioner is bad? Boost pressure should be constant no matter what else is going on with the engine.

MustangMan00

def change the plugs first off...I have the TR6's gapped at .032

01MGGT

Threw a p0172 for rich bank 1. Changed the plugs with the TR6 gapped at about .35 so we will see how it goes from there...

tbirdscwd

Is the same guy that couldn't figure out your stage 1 cams tuning this also? JK

01MGGT

Yah lol. but 99% of the problem was the software that we had just updated to. The other 1% was not listening when I told him it thought we had bugs in the software lol. Nobody else has volunteered to help tune for the blower

01MGGT

Ok sent me a new tune today. He changed the MAF transfer function and some fueling and it's doing a ton better so far. wideband says about 10.8-11.0 at wot but I have a small exhaust leak upstream of the wideband 02 so we are trying to wait to get that fixed before pulling to much more fuel. Just to be safe. The plugs also seemed to make a huge improvement. I will keep you guys up to date on how it does