s15 back firing on decell ??

chris2712au · Post by **chris2712au** » Sat Sep 26, 2009 10:34 pm

got me stumped what is going on with it... any ideas I thought it might be my rear housing on the turbo but not sure as I have also heard others with the same prob when they went to a free flowing exhaust ??

TM_S13 · Post by **TM_S13** » Sat Sep 26, 2009 10:42 pm

it's not uncomon to get a bit of back firing on decel with a free flow exhaust...

chris2712au · Post by **chris2712au** » Sat Sep 26, 2009 11:09 pm

can we reduce it or eliminate it ? i see that map ign advance on decel..??

Legionnaire · Post by **Legionnaire** » Sun Sep 27, 2009 8:47 am

If you mean flames from exhaust on deceleration, I actually like how it looks to be honest

But I guess you should really reduce amounts of injected fuel in high rev/low load area, i.e. the leftmost column of the fuel map

Matt · Post by **Matt** » Sun Sep 27, 2009 11:45 am

I'm thinking the fuel cut/recover tables. Same issue on my R34 which I need to fix up by adjusting where it does the cut

Get a log with the rpm vs injection to find where the injection is when you here it pop. Try and cut it out earlier

If you have S14/S15 I havent got the fuel cut/recover tables for that yet but its on my todo list

chris2712au · Post by **chris2712au** » Sun Sep 27, 2009 1:19 pm

2k and under tps closed no load just coasting in gear.. but mines an s15...