KA-T falling flat on its face
 

first off the car.. 90 240sx running a sohc ka turbo.. Car is falling on its face right b4 it hits boost.. in every gear. if i watch my safc around 21% throttle it cuts out and when i say cuts out i mean there is nothign until i let off the throttle. Its getting extremly hard to drive. Checked all plug leads and everything is in tack no cracks or anything.. plugs rotor cap all done in october. Also i have started to notice sometime if i drive over some snow on the road and the engine bay takes on snow my lights dim and the altanator belt seems like it is squilig. checked it out and it seems to b a tad bit loose im going to tighten this up.. but i doubt that has anything to do with the car not being able to drive.. Please any help would b great thanks guys

Im very confident that your problem is intercooler related, check all your pipes and connections cause a loss of pressure there will equal no boost. Happend to me a little while ago and i couldn't get the car over 3000rpm, it would just bog right down.

really... hmm something i would have never looked at! there has been alot of snow jamming in there latly and build up in my engine around all my pipes.. i will look first think in the morning just waiting on some light.. thanks man

OK so i snugged down everything made sure there was no leaks and im still having problems with the car,.. car still sputters a bit and boggs down the odd time.. i think there is more of a problem then just boost.

take it to your local shop and have them look at it.

Have you actually removed the plugs and inspected them? Do you have a wideband? What is your alternator putting out?

is your blow off valve leaking?

yes i have checked my plugs the first 3 are normal. and the 4th is a bit black so changed the lead.. i have a aem wideband gauge .. not sure what the alternator is putting out

how would you check to see if its leaking?

Check the MAF.

I'd remove the bov and plug it temporarily. Else, if its adjustable, crank it down to full stiff.

if it's MAF it's most likely a loose coupler.

what does the A/F say when it bogs? lean or rich?

how did you set up your SAFC ?

go to ka-t.org they got a lot of trouble shooting stuff for you great place to figure out ur problems with the single slammer

What are your A/F Ratios? Have you had it tuned? If you havent, there is a good chance you could be running either rich/lean.

What injectors are you running? Ive seen people throw in injectors way to big, trying to run them without touching base fuel pressure, or without touching injector pulse/lag.

Could very well be MAF related. Where is your MAF in relation to the turbo? Pre turbo or post turbo? Perhaps your maf was about to pack it in prior to the KA-T, and after some vibrations etc, its semi-dead. When your cars idling, just hit the maf, dont clock the thing, but hit it decently. See if the car does anything funny.

i would check :

MAF ( is it stock or 300zx TT )
plugs
IC piping
AFR's as to much fuel can make this happen.
02 sensor.
injectors.