i'v got an 91 si hatch with ls swap and 12.5 to1 compression.....it had a very bad bogg at wot and i have since installed a 255 pump and fpr...i turned the fp up some on the car and got rid of the bogg. but there is still a slight hesatatiion at wot under 5k rpm....it is just slightly noticable but i need to get it corrected before i spray the car.... does anybody have any ideas on what it could be......

 

Is the car tuned?

 

We are going to need some more details (motor specs, engine managment, etc.)

 

the only thing the car has is a 255 pump,fpr, and a chipped pm6 ecu.

the engine is a b18a1 with 12.5 to 1 compression and b18b1 cams..everything else is stock. also has cold air intake with header and full 2.5 inch exhaust.

i have no idea what the base map is but the car hasnt been tuned....

 

I think we found the reason your car doesnt run right.
If you want to build a motor AND have it run decent a good tune is a must.

 

thanks for the help i guess...the reason i ask is because my buddy has the same setup plus shaved and ported head and his car runs fine with the stock ecu and fpr.......

 

2x

 

who in NC tunes obd0