I have both the GM sensors for IAC and Water temp on mine. Everything works perfect....only thing that my car had issues with was the cold and hot startup. Now in a previous post david posted that he had to install a resistor on my car, but other then that it runs flawless....well that hicup in higher rpm, but thats cause my dwell was 4.0....changed to 4.2 so should be gone.
Right now I am waiting on some news on my new turbo I am going with....thinking the variable vane turbo Should net me some great numbers
my car stalls when i pull the iac. how can i stop that?
edit: also, it revs fine up to about 6000. then it kind of breaks up, i set dwell to 4.2, and it didnt help. my spark angles there are from 32 at WOT to 35 pussyfoot. each time it breaks up. its like a pop pop, then i let go. where should my angle go, up or down, also, i have to be really careful with my 2.0 because i cant have as much timing as you srt guys. my prob was with the iac, because if i held the throttle open, i can get it to sit at about 700, and even 600 if i want it to. any advise on that?
You sure it's not running lean up top? Do you have any datalogs showing what's happening? Go ahead and post up an msq as well. Also with the IAC, I stated in earlier posts that you would need to manually adjust the idle using the adjustment screw on your throttle body. That way you won't have to hold the TB open with your foot.
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I have both the GM sensors for IAC and Water temp on mine. Everything works perfect....numbers
I'm sure you mean the IAT. Casper is having trouble with his IAC as did I. I'd like to know where he needed to install the resistor. Did it have anything to do with the IAC at all? How is your car idling by the way?
EDIT: Seems he added a resistor to the TPS. I'm guessing the signal wire.
I have both the GM sensors for IAC and Water temp on mine. Everything works perfect....numbers
I'm sure you mean the IAT. Casper is having trouble with his IAC as did I. I'd like to know where he needed to install the resistor. Did it have anything to do with the IAC at all? How is your car idling by the way?
EDIT: Seems he added a resistor to the TPS. I'm guessing the signal wire.
Yea I meant IAT I cant remember where the resistor was hooked...car idles fine.....although the exhaust manafold and turbo are off. I sold the turbo to go bigger....so car not running right now
well if i could just put a little resister in some line, and my iac would work fine, i would be prtty happy lol would you be able to find out?
what did the origional 6200 breakup feel like. was it a little studder, or was it a loud pop, because mine is a loud pop like a backfire or something then my car chimes a few times which is bad. ill have a datalog later
edit: i dataloged it, and found that when my car stutters, the timing angle is -10!!, so i think that may be pretty bad, any ideas anyone? ill have to look at my msq later, but any ideas ??
edit again: if anyone cares, i fixed it, for some reason i had a "soft" rev limit at 6300 where the timing was -10. its a good thing i found it now. still looking for that resister thingy
Last edited by CASPERAMC : 05-22-2007 at 01:26 PM.
I am sorry..I get home every night and its late. I tried to contact david, but he is busy and cant get through. I can take a picture of where it is at, but I have no clue as to what sort of resistor he used.
that would be a start to know where it would be, but id need to know what kind of resistor. i know some of them have colored stripes to tell what kind they are, so maybe that would work.
well if i could just put a little resister in some line, and my iac would work fine, i would be prtty happy lol would you be able to find out?
what did the origional 6200 breakup feel like. was it a little studder, or was it a loud pop, because mine is a loud pop like a backfire or something then my car chimes a few times which is bad. ill have a datalog later
edit: i dataloged it, and found that when my car stutters, the timing angle is -10!!, so i think that may be pretty bad, any ideas anyone? ill have to look at my msq later, but any ideas ??
edit again: if anyone cares, i fixed it, for some reason i had a "soft" rev limit at 6300 where the timing was -10. its a good thing i found it now. still looking for that resister thingy
Yep. Thats what I was thinking when I first read the post. Have you checked all your "Rev Limits" settings? Another important thing to do now that you are controlling timing is to go to "Rev Limiter Type" and make sure you only set "Spark Cut only" over the different rev limiters types over there, I mean if you are not turbo this is not too critical, but if you are then it is... Its not a great idea to cut your fuel at high loads when you are turbo. Depending on how much the engine has been abused at a given pass for example things could get way too dry by accident. Its not that you could not cut fuel, for example there is no other way of limiting if you are running fuel control only, but else its just safer.
Another advise is to be careful about the "noise" you hear at certain ocations when you are not completely tuned in terms of timing because it could be pistons knocks what you are actually hearing and thats not good. This will happens usually if you advance the spark too much (higher spark table numbers). This happens because if the spark is ignited way too soon, then the piston tries to complete the compression phase against a complete or an almost complete detonation cause by too much advance. You can see it like this, high numbers in timing = N/A cars best friend at high loads (but with care, of course there are limits), the contrary in turbo cars it could kill your engine in a snap if you are to advanced, because of the higher pressure loads that a Turbo engine is running inside the cylinders at high boost.
I'm not pretending to be an expert by any chance, but I'm just dropping my two cents since I noticed you are a bit uncertain or worried about timming advance/retards worst effects.
thanks for yout concern jose, i have everything set up better, and i did some nice highway pulls today easily, and the car is pulling pretty hard.
also, any updates on resister locations or types vschaos?????
Nice! Do you have any video taken or are you planning on taking some? I'd be really interested, haha.
I think that for resistance values to adapt the output of the IAT you could work either size you want, after all it would be guessing work. I recommend however you use 1/2 watt type resistors because they are stronger. Remember that wichever works you have to protect it against too much bending of its legs. Sometimes you can use potentiometers too if the guessing work is too much (need to fine tune) this way you can just turn it and watch the result at the megatune. We have used this techniques to fine tune both tach output and temp sensor values and it have worked but since there is so many sensor variants for different cars is not easy to correctly identified the correct ones for given car model, it can be done for sure.
What injector size you have? Would you mind to share your MSQ with me, so I can compare mine with a really functional one?
really no reason to take a video because y car is slow anyway lol its a n/a 2.0, so not sure if you still want my msq. send me an email adress, and ill give it to you if you really want...injectors are stock 19 lbs
really no reason to take a video because y car is slow anyway lol its a n/a 2.0, so not sure if you still want my msq. send me an email adress, and ill give it to you if you really want...injectors are stock 19 lbs
Remember is not if your car is fast or not at this time, because that you could change in the future just by adding upgrades, but nice engine management you can't change that easly. So, if you wish for a video of performance then you might not want to take it, but if you wish for a video to testify nice engine management independant of the actual engine mods, then I said to me at least it would be really kweel thing to have.
Specially to show off that the MS can control nice engines just like others aftermarket ECUs or even better!
Yes, I do really want that MSQ if you could threw it over here. Copy it to: info@MegaSquirtPR.com
Thanks a lot!
Last edited by MegaSquirtPR.com : 06-01-2007 at 04:53 PM.
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Should net me some great numbers 
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