My car is a del sol b16a turbo! My exhaust setup is 2.5 dp straight into 2.5 piping all the way back to the axel back section that is still stock! I have no cat, the piping is welded directly to the dp! When i hit the gas, when the rpm's are coming back down, sometimes i get a pop like a backfire??? What causes this, not having a cat? I didn't have a cat on my last car, but it wasn't FI. TIA! This is annoying as hell!

 

Sometimes the exhaust gases that comes out from the exhaust ports may explode in the exhaust manifold because your running too rich (exhaust scavenging, may pull some of the fresh air/fuel right past the combustion chamber into the exhaust ports)

 

What can i do to fix this, can i tune it out with cam gears? If so, what kind of settings should it be at?

 

Easiest way to do this is to lean out your fuel mixture.

 

I am using a fmu! I don't have a whole lot of control, But I have stopped using the inline fuel pump that came with my drag kit!

 

Only othe way is to put your a cat back on. As for not using the inline pump, that's not a good idea.

 

Use an AFC to lean out the mixture or better yet get Hondata and get it tuned.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattssi &raquo;</TD></TR><TR><TD CLASS="quote">My car is a del sol b16a turbo! My exhaust setup is 2.5 dp straight into 2.5 piping all the way back to the axel back section that is still stock! I have no cat, the piping is welded directly to the dp! When i hit the gas, when the rpm's are coming back down, sometimes i get a pop like a backfire??? What causes this, not having a cat? I didn't have a cat on my last car, but it wasn't FI. TIA! This is annoying as hell! </TD></TR></TABLE>

Annoying? I think it's kinda cool. LOL. My car does it even with a cat on. Then again, I'm running really rich.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattssi &raquo;</TD></TR><TR><TD CLASS="quote">But I have stopped using the inline fuel pump that came with my drag kit! </TD></TR></TABLE>
That's a no no, you need the pump because your stock pump isn't going to be able to support the high fuel pressures.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ben@importparts.com &raquo;</TD></TR><TR><TD CLASS="quote">Easiest way to do this is to lean out your fuel mixture.</TD></TR></TABLE>

Couldnt of said it any better

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nfurno &raquo;</TD></TR><TR><TD CLASS="quote">

Annoying? I think it's kinda cool. LOL. My car does it even with a cat on. Then again, I'm running really rich. </TD></TR></TABLE>

Jimmy if you like it, pull your cat off and shoot some flames.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ben@importparts.com &raquo;</TD></TR><TR><TD CLASS="quote">

Jimmy if you like it, pull your cat off and shoot some flames.</TD></TR></TABLE>

That would be fun, but I'm too chicken shiet of getting busted w/o a cat. Also my eyes water when I don't have the cat on and chicks don't dig the smell either. LOL