stupid probs with my dsm

[wishihadatalon]

Alright this is going to be long. I bought my car back in november (happy birthday to me). When I bought it it was getting cold here and I was having a serious fuel cut issue. With the fuel cut issue I was still able to keep with my friends cavilier that ran a 13.6 trapping at 105mph. I parked the car for the winter and later in the winter I had the car sent to a friends house so he could do a motor swap for me. I got the car back and it was running good but still fuel cut issue. As it got warmer the fuel cut went away.

Now that its getting warmer my car is running like crap. I had a studder up top around 5-6k rpms. Bought new ngk plug wires and ngk bpr7es plugs. For a little while it was working. While it was running decent again I decided to tune my maft to try and extract some power. As I am tuning it I notice that the turbo now has a different tone when spooling up. I get to the track and got to see what my tuning could do, no luck all I could run was a 13.5 at 98mph with a 1.7 60ft. After doing some logging I see that its knocking quite bad up top, so I click the maft 1 click richer. Wohoo no knock. Well now the car just feels blah.

Now on my logger I decided to check my injector duty cycle and it has maxed out at 142. I am pretty positive that is way wrong and not good unless the pocket logger diplays in some other value unlike all the other cars I have messed with.

So here are some cliff notes. Car ran good, did motor swap still ran good. Then car starts running like crap sputtering. New plugs and wires help out. Car starts running like crap again and turbo makes different tone. Got rid of knock and now logger is telling me that duty cycle on the injectors is 142.

My mods for the most part are:
255 pump
550cc injectors
full throttle fpr
big 16g
maft v2.0
uicp
ported exhaust mani
3 inch exhaust
stock side mount

Any help or tips would be greatly appreciated.

Thanks guys
TJ

 

[BigRb247]

What is Fuel pressure set at?

 

[wishihadatalon]

38psi.

 

[DSMTalonAWD51]

looks like you're ready for a front mount, you'll most likely get less knock and be able to keep your a/f ratio a littler leaner. does it run WAY better at night? also try building a little sheet metal cold air box around your filter

 

[wishihadatalon]

It does run a little better at night. Could also explain why it was running better when it was way colder out?

And speaking of front mount

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Pics of the fmic are to big to post so here are the links.
http://home.comcast.net/~bcknblk4g63/P1010060.JPG
http://home.comcast.net/~bcknblk4g63/P1010064.JPG

 

[DSMTalonAWD51]

the colder the air is going into your enigne the less likely you are to knock, therefor your timeing will advance more, and your car will produce more power (in a nutshell)

 

[wishihadatalon]

Yeah but I am looking for a explination for why my car might sputter. I think we figured out why its slow