Car went bad lean on dry shot???
Car went bad lean on dry shot??? well i just put a dyno tune dry kit on my car, ive got a walbro 255 pump and 42# inj. other mods in sig. i have the nitrous outlet window switch with the electronic wot switch built in it. ive sprayed the car about 5 times on the 150 shot and it seemed to hit ok, but just not that hard. so i had my tuner go for a ride to check everything, and when i hit it the first time with the wide band hooked up it went to 17:1 and stayed there for about 4 seconds so he told me to get out of it. why was it going so lean? i thought the mass air meter was supposed to compensate for it and tell the pcm to add fuel? we have the nozzle at the very front of the lid bout 12in. from the maf, sprayin directly towards it. but after that first hit he added fuel to it and man what a difference it hits so hard now, and the a/f is at 11.5. I guess im just wonering why it went so lean, and why didnt i hurt the motor before i found out?
he just said that the mass must not have been able to keep up with that big of a shot. it was a 175 flywheel shot. he hadnt had a chance to tune on it before then, so it wasnt anything that he would have known before then
walbro 255 pump and 42# inj
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+1
It's TOO far from the Maf. Try and move the nozzle(s) in the 3" to 5" away and pointing directly at the wires. Then, with a smaller shot, start testing. Usually a small rotation makes a big difference.
Take a look at Robert56's website for some pictures of nozzle placement. Also, run the TR6 plugs if you haven't already.
It's TOO far from the Maf. Try and move the nozzle(s) in the 3" to 5" away and pointing directly at the wires. Then, with a smaller shot, start testing. Usually a small rotation makes a big difference.
Take a look at Robert56's website for some pictures of nozzle placement. Also, run the TR6 plugs if you haven't already.
Ignore me, its early in the morning. 
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You want it directly at the maf for the richest reading. The wires will not freeze as they are heated. The only thing that may freeze is the screen if it was not removed.
i talked to dyno tune today, and they said to get the nozzle as far away from the maf as possible, up to 12 inches. he said that getting it real close, like less than 6 inches could cause a problem of the maf not reading the nitrous due to it blowing by too quickly. also they said that the nozzle is best pointed directly at the maf.
i talked to dyno tune today, and they said to get the nozzle as far away from the maf as possible, up to 12 inches. he said that getting it real close, like less than 6 inches could cause a problem of the maf not reading the nitrous due to it blowing by too quickly. also they said that the nozzle is best pointed directly at the maf.
Do a search for something like "nozzle position", you will see this is covered frequently.
well now since hes had a chance to tune it, i plan on leaving the nozzle where its at, i dont have to worry about the maf anymore. it hits so hard now its rediculous. it really wanted that fuel!!! a/f is at 11.8 when it kicks in, and drops to 11.2 by the time it shuts off.
