Hey, lately my vlt has been surging/ hesitating on boost around 4000rpm in 2nd and 3rd gear. The fuel pump and fuel reg have been upgraded, Iridium sparksplugs and Splitfire leads also. Just wondering whats going on and is it best to just put it on a dyno.

It sounds like its breaking down then while on load i could be wrong so yea my 2 c

Quote: Originally Posted by local Hey, lately my vlt has been surging/ hesitating on boost around 4000rpm in 2nd and 3rd gear. The fuel pump and fuel reg have been upgraded, Iridium sparksplugs and Splitfire leads also. Just wondering whats going on and is it best to just put it on a dyno. yukky iridium plugs. whats your gap set at. high boost should be around .9mm

yep .9mm, already checked the gaps

dirty injectors? low fuel pressure? did u change fuel filter when doin pumps and stuff? Carlos

sounds like plugs.. go back to standard NGK bcpr6es gapped to 0.8mm

yeah I did the fuel filter a while ago but it could easily have **** in it, I'll change it and see how we go, thanks

mine did that once was either CAS or AFM on the way out. Pritty sure it was the cas

this is what my cars doin to hit around 4500 5000 and its like i got a limiter set there ever think in my car is new ? fuel pressure right new leads new coil new dizzy cap new rotor button **** nos what it is the only think in the car thats not new is the valve spring so the next

yep its fustrating, as well as the car surging, boost is also only hitting around 6-7psi with a 12psi actuator so I'm definately putting it on the dyno to get the preload on it checked also.

yer thats what mine doind to 10psi ant its got a 14psi spring

did you move your cooler pipeing caus this happened to a mates car... what happened was cooler pipeing was to close to the dizzy and the leads were earthing out onto the cooler pipeing which caused it to surge on boost

i got a top mount and custom plenum so its goin no cooler pipes there but i try movin the stainless inlet pipe see if it makes a differents ????