Hi, my FD is from japan, so it has no pre-cat, I was running stock until last week, when I put on a HKS Superdrager catback and an ARC intake box, afterward, my car backfires quite often.
Is this normal? Because when I had everything stock, the car did not backfire at all.
Does this mean Im running rich or lean? Any input would be appreciated

 

Dont worry about the back firing (i dont!), its pretty normal for an aftermarket exhaust.

 

You mean backfiring like this?

http://www.youtube.com/watch?v=LEeKquZLbOE


That is fine, and to be expected if you're running a free flowing exhaust, without any cats at all.

Do you have an aftermarket ECU?

 

Thanks for response
Hi I have stock ECU and still have the stock catlyst converter.
I only put on intake and catback.

 

I'm in japan and I've got a straight thru exhaust with an HKS FCON on the computer and I noticed mine has been back firing a lot which makes me a little nervous as well. But mine started when I started using high octane gas off base instead of the crummy gas on base with an octane booster. I'm waiting to see if it still happens as much when i get the computer retuned. So ur car is right hand drive? What year?

 

Hi my car is 92, right hand drive, I heard a lot of people say backfire is normal, I guess it is normal then.

 

Well the idea of a mostly straight thru exhaust with all the hot exhaust hitting the outside air does cause the back fire but I noticed mine has been a little more than normal I think I'm running a bit rich. I have a 98 but I can't bring mine to the US. So I'm planning on stripping it down before I leave buy another FD when I get back to the states and throw all the parts in. Should be a lot of fun! That's awesome u have a right hand drive in the states let me know if u need something specific.