Exhaust Popp!

[chinkeboi]

Hi guys..

Ok.. done a search already on this..

After installing a catback exhaust, it is making these POP noises when coasting in gear. Kinda like gun shots.

My car (r32 GTST) is standard minus a pod filter, walbro fuel pump and catback exhaust. It is running 0.8 bar boost (13.5 almost 14psi)

So I've concluded that I'm running rich and that the fuel is not getting burnt and shot into my exhaust which is hot.. where it ignites and makes the bang? I am correct so far right?

Anyhow.. my questions are: how come my car is running rich with such very few modifications? what is the explanation behind this?

How can i get it to run normal? It's come down to a retune or an SAFC.

A Retune on a stock ecu running such little mods is stupid IMO.. but how much will it cost roughly?

And how much rougly would it cost to install/tune a SAFC?

Thanks in advance, Ben.

[R33S2]

The standard exhaust is designed to restrict engine power, to keep with ADRs, what happens when you open it up is, the engine produces more power at the rev range> more air so the ecu adds more petrol to be safe.

[Absent]

Your stock ECU at that boost level is useless

Definiately need a 3 inch front and dump pipe giving you 15-20rwkw

Your at the limit the stock turbo can handle I recently got an SAFC 2 and it's a must with 14psi

I got my SAFC from Nengun for like 350 installed it myself and cost 200 for tune

Good Luck

Edited October 26, 2006 by Tuffr32