High boost?
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ok, i'll let him know that, i just think the boost is going up because of the cold weather and i've told him that and he thinks it is another reason.
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It will make it go a little higher because of the denser air but 20PSI+ is excessive. Does he hit Fuel Cut? I have my MBC @15psi and if I get on it I fuelcut all over hell. Reminds me I had better turn that down.
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not sure, it does pop alittle at higher rpms
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btleier wrote:
no, those mods would not make you run 20+ psi of boost... cold weathers have been known to cause boost spikes... just be careful... if you have a datalogger available, make sure you're not knocking too bad, if so may you should richen it up or stay off the throttle when it's too cold.<- you could should heed to that.
What is BCS? Boost Control System? what? I take it that he's just using the stock wastegate actuator. Having boost go up is a normal problem with internal wastegate's... it's called boost creep.
-GSX-Falcon wrote:
It will make it go a little higher because of the denser air but 20PSI+ is excessive. Does he hit Fuel Cut? I have my MBC @15psi and if I get on it I fuelcut all over hell. Reminds me I had better turn that down.The reason you are prob fuel cutting is becuase your running to rich without any sort of fuel control. You have a Walbro pump, bigger injectors and no S-AFC if I'm remembering correctly...
When I had nothing but a fuel pump, a bigger turbo, stock injectors, and a boost controller, I fuel cut on cold days, a quick tune and that was all gone...
LT1 wrote:
yea mine fuel cuts too when i full throttle it in cold weatherLT, if your still running like 25+psi of boost, there's something wrong, no matter how much you richen / lean it out... somethign else is messed up... if your constantly hitting fuel cut, you should get it fixed before after time it goes kaboom.
Anyway, running 20psi on a 14b isn't terrible, you'll prob blow it up eventually (the turbo) but it doesnt matter. The one thing you don't want to do is be running it too lean though... if its a matter of its fuel cutting because its to rich, you should see if you can control the boost / replace the wastegate actuator, and get somes sort of tuning device; if its running lean, everytime you romp on the gas your most likely causing it to knock, lucky for us, our dsm's can pull timing to adapt... but theres only so much timing that the ecu will pull and then your fucked... hello new engine.
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if you hit fuel cut, your car hesitates and "cuts" off really bad, you'll know if it you feel it, just like the engine stops for a slight period of time.
if your popping when you stomp the gas, check your plugs and wires.
if he's got nothing but "free mods" and he's got uncontrollable boost, there's a good chance that the stock fuel system wouldnt be able to provide enough fuel, the stock intercooler would get pretty hot, and that he's picking up a fair amount of knock
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yeah actually mine was doing a similair thing, luckily i was still tuned for about 24psi, but it being so cold i ran extremely rich, like around 9:1, and i got a fuel cut, i think it may just be a miss, simpley 'cause it can't burn it all, i'm honestly not 100% sure why i was doing it, but at least i know i wasn't leaning out (nice to have a wideband in the car) But my fix was easy, just turn down the boost, and the fuel too, and just retune in the summer.
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When I had nothing but a fuel pump, a bigger turbo, stock injectors, and a boost controller, I fuel cut on cold days, a quick tune and that was all gone...
That is actually exactly what I have. I got the 450cc's (auto came with 390) But I also got a manual ECU so it has the proper fuel maps. Thinking of getting a SAFC here soon but i need to wait till summer so i can dyno tune it.
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out there wrote:
bah, you don't need a dyno to tune such a small turbo. just a datalogger to see where you're getting knock and/or losing timing; keep your o2 nice and smooth around .88-.94, i've seen different numbers for different years, so you should ask around..to do it? or to do it right?
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