So I just boosted my 96 maxima and got it street tuned. And this is where my problems kinda started. So the first time we tuned it I wasn't making boost, come to find out my MAF cover was cracked, so I got a new one installed it, did a boost leak check and the new MAF lid started to lift. Has anyone else had this problem with their MAF? So my next problem is that I'm not making even close to what I think I should for boost. I have a 10 psi pulley, I know my guage wont read a true 10 psi, but all I'm reading is 5psi where is the other 4 psi going? And my last question is how much does the AF suppose to search? my AF while I'm crusing will go between 14 and 16.5?

My setup is a a V2 10 psi, 3" cold air intake, 2.5" IC piping w/ a mishimoto front mount (28" x 7.5" x 2.5), 00iv and 600 DW injectors. The tuning software is NisTune.

And on a side note would a bad engine coolent temp sensor make the car hard to start??

thanks
Chris

 

I rtv'd the cover and held it in place with zipties

 

Also u lose 2-3psi with a intercooler setup and you'll only get the full 10psi out the pulley at redline

 

At redline I only hit 5 psi.

 

My MAF cover sprung a leak on the dyno. I used some epoxy and its been good ever since.
You either have a boost leak somewhere, may need to tighten the belt, or possibly the BOV needs adjustment,

 

Aren't those 600cc DW injectors too big? You probably lowered the fuel pressure to run them but they might be causing hard starts.

 

Nice.. Yea I pressure tested the whole system and ir seem sealed, but the bov doesn't seem like it likes to close so I ordered a new tial Q

 

My fuel is at 43 psi. which from what I've read is around what is should be for our cars..

 

Yes that is base pressure with stock injectors, but when you go larger you need the fuel correction, improper adjustment leads to hard starts, etc. Emanage correction factors for example, lower duty cycle so larger than stock injectors can function properly. I'm not familiar with nistune software at all but you should be able to take away fuel.

 

Do you have an adjustable fuel pressure regulator?

Also, I see you have bigger injectors but not a bigger fuel pump?

 

Ah. true, I forgot about that. yea I can take fuel away with the nistune. out of curiosity what do you run on your fuel pressure?

 

Ah good catch Chris I have a 255 Walbro fuel pump

 

if tuned for it stock fuel psi and 600cc injectors can be ran n/a so that's fine, like I said if your tuned for those injectors

but like stated maybe the bov needs to be adjusted so even if you buy a hundred new bov's if they are not adjusted your problem will not be resolved. also like stated check for belt slippage

 

Thanks I'll check these things this weekend and give you guys an update.

 

I am running stock fuel pressure and stock fpr with 370cc injectors. I'm on emanage blue so it has a correction factor for the injectors. You would have to find out if nistune has a correction factor, or you would have to map out and take away fuel cell by cell yourself. Or you could slightly lower the fuel pressure. There are some threads on people running 550cc injectors from years ago, one of the numbers I saw was 22 psi.