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Discussion Starter · #1 ·
When i set my mbc to 21 psi i hit fuel cut, or at least what i think is fuelcut, it jerks then is fine and if i do it four time i throw the overboost code so i know its that but why do i hit fuel cut at 21psi, is that where i should be hitting it? any ideas, i know i dont creep to 25 i do have some creep though but i creep 21 and i hit fuelcut. anyone know what could be goin on? or is that where im supposed to hit fuelcut?
 

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CArkid0101 said:
When i set my mbc to 21 psi i hit fuel cut, or at least what i think is fuelcut, it jerks then is fine and if i do it four time i throw the overboost code so i know its that but why do i hit fuel cut at 21psi, is that where i should be hitting it? any ideas, i know i dont creep to 25 i do have some creep though but i creep 21 and i hit fuelcut. anyone know what could be goin on? or is that where im supposed to hit fuelcut?
Fuel cut is not dependent upon the boost level, so ignore that for now. You get fuel cut when you are flowing enough air that the ECU decides to cut fuel in order to protect the engine. It really isn't protecting your engine in this case, but it thinks it is. 21psi is pretty low to be hitting fuel cut, but if you aren't tuned and live in some cold weather, it's much more likely to happen. Basically, if you have an MBC and/or other mods, you shouldn't be running around untuned. Also, it's not something you want to keep doing over and over.

Now, you're making me concerned when you say that you have some creep and that it creeps to 21. Do you mean you SPIKE to 21psi, or do you really creep? You should not ever creep, which means you are hitting a lower initial boost, then it is RISING as the RPMs rise - this is opposite of normal where you should spike initially, then slowly taper down.
 

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Discussion Starter · #3 ·
i do mean spike, but i have noticed that it hits say 19, then climbs one or two more psi especially in third, but it doesnt do it regualry meaning it might be me freakin out or my head playin games, but if i get a mail in all of that will be cured minus the creep if it does exsist? my deal is though, is i wanna get cams, and cam gears and a fuel pump and then i wanna do a mail in and i rather knock it all out at once. the only mods i have are a 3inch turbo back w/ no cat, boost controller, step colder plug, open element air filter, and a turbosmart bov fully recirculated, thats it really, and for summer i wanna do cams, fuel pump and maybe a fmic but i wouldnt tune for the fmic right away. should i wait or is it that important that i get a tune as fast as i can for the mods i have now? i see me doin some more major mods (20g, fuel, exhaust mani, external wastegate setup) and goin big this fall and i was gunna get protuned at ams, but for the summer i wanted to just do a dynoflash. tell me what yea think of that and point out the bad ideas and help me out

p.s. the boost does NOT rise incrementally after i hit my desired psi following my rpm for sure, when i have noticed creep was it would hit 19, then stay for a half a second then rise two more than tapper immediatly if it happened
 

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If you get a flash now, for your current mods a re-flash from the same vendor will be substantially cheaper than the first flash (return customer discount). In the long run a whole series of flashes could still add up to a bunch, but it is better to be properly tunned for your current modification level rather than running around untunned waiting for more mods..... because there will always be more mods, and if you keep waiting untill they are all installed you will never get tunned :)

Keith
 
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