I'm having a complicated problem on my ka24 240sx that should be simple. I was running a draw through maf on my 48/60 t3 turbo. I kept having pinhole leaks in my welding so I converted to blow through. Before the switch I was pushing 6 pounds. since I've switched over I've pulled off all the pipes and made sure all my welds are sealed. somehow I seem to only be getting about 2.5 psi of boost though. I have a boost leak checker and there are a couple little holes I will plug, but my boost controller is even tighter than it used to be... So im losing about 6-8 psi of boost? Where did it go? I'm running stock exhaust with a cutout, but there wasn't a problem before. Could the turbo be fucked? I'm very confused. Help!

Cliffs notes.
Was pull through maf - had 6 psi.
switched to blow through - 2.5 psi - should be 8-10
no big leaks found so far.

Any other possible explanations?

 

Switch the MAF back to pull through setup. Ive never seen one work with blow through. Also make sure the MAF is horizontal or close to.

 

post this question at ka-t.org man, you'll get more answers about this type of setup. with this motor

 

mine is a blow through, and its not horizontal at all. been running it like this for well over a year....

http://www.donkeypunchperformance.co...fun3.sized.jpg

 

when running blow through, i hear you need atleast 6 inches of straight pipe on each side of the maf. or try convertng to map lol

 

I would love to go to map... im just poor.
Ok, so I need 6 inches and all this.... we're missing the main problem though. where is my boost? I dont think a bad maf reading will bleed off my boost.

 

This statement I made applies to the meter flap type air flow sensors not the hotwire ones. I tought he was using the flap type. I'm sorry If I miss directed you alpalwal. OK back to your problem. Since you just moved the maf, I would look over the charge pipes and make sure everything is tight and there are no leaks.

 

did you do anything else like add a fmic or something? could jus be pressure drop, up the boostn see what happens.