My prelude spits flames??

jakeebbon · Post by **jakeebbon** » Sun Nov 22, 2015 10:39 pm

Just got told im spitting big flames around 7k-8k rpm....overfueling? dumping fuel? its decatted but wasnt expecting flames

Post by **simonc** » Mon Nov 23, 2015 1:33 am

Jammy sod. I wish mine did that.

Post by **JEBB4** » Mon Nov 23, 2015 2:49 am

Mine does this aswell on upshifts and flat down shifts, I put mine down to very poorly mapped "spoon" chip in my ECU combined with decat and full stainless strait through.
I would check your Ecu for a chip

bennyboy · Post by **bennyboy** » Mon Nov 23, 2015 8:42 am

They all tend to do that after a decat and on the standard ecu as preludes run a little rich. The unburnt fuel hits the hot exhaust and pop.
Mine did it until I had the hondata installed and mapped, then had that extra fuel dialled into extra ponies.

mart609 · Post by **mart609** » Mon Nov 23, 2015 8:42 am

Most preludes overfuel standard.
mines spits flames on upshifts. most will when they're decatted

Post by **Merlin** » Mon Nov 23, 2015 9:02 am

I have never spat flames, even on my old engine that was untuned (but chipped) with a decat. Spitting flames and pops/bangs can be a sign of poor ignition timing. If too retarded, fuel ignites in the exhaust rather than in the cylinder where it should be.

Easy to sort on a 4th gen - http://www.ludegeneration.co.uk/honda-p ... 11854.html

jakeebbon · Post by **jakeebbon** » Mon Nov 23, 2015 11:55 am

haha thanks for the input lads!! yeah when my mate pulled up next to me and said i spat a couple of big flames i was like whatttttt??? and yeah cheers Merlin ill look into it!

Post by **vanzep** » Mon Nov 23, 2015 4:00 pm

@bennyboy is right - almost all 4th gen vtecs will spit flames at top of rev range if they have been decated as they all run rich with standard ecu and even more so with chipped ecu

Post by **JEBB4** » Wed Nov 25, 2015 9:18 am

Thinking about it now my old B16 civic used to do it with the standard ECU just with a decat and full system, think most of Hondas performance engines are all just set up standard to burn fuel like it's going out of fashion

........... I like that

Post by **indigolemon** » Wed Nov 25, 2015 11:26 am

vanzep wrote:... they all run rich with standard ecu and even more so with chipped ecu

Actually, if it's a spoon copy chip, it should run leaner, hence the requirement for premium unleaded - you remove the over-fuelling safety net as part of the changes made by the chip.