Skyline Detonating On Dyno

[GotsWapan]

The car back fires a bit now, is this a common thing?

Not sure if its related to the rear muffler or tune related. Its like its throwing out unburnt fuel on deceleration. Its extremely loud

[DVS JEZ]

The car back fires a bit now, is this a common thing?

Not sure if its related to the rear muffler or tune related. Its like its throwing out unburnt fuel on deceleration. Its extremely loud

What ecu are u using?

[Rolls]

Are you running an atmo bov or have the stock one blocked off and fluttering with an AFM? that will make it go rich on gear changes.

[GotsWapan]

Its a Wolf 3D V4, and a turbosmart raceport atmo BOV was put on with the rest of the gear.

Its only back firing in the lower revs driving normally around town, it doesn't cough or blow flames on WOT

It doesnt run an AFM its a MAP sensor setup

Edited May 27, 2012 by GotsWapan

[SS8_Gohan]

still got the stock bov?

[GotsWapan]

Block off plate is on where the stock one goes.

[SS8_Gohan]

for what you're running, stock Bov is fine and the atmo might just be causing headaches for no reason. If you want the noise, fair enough, but there's no actual need for it.

[GotsWapan]

I plan to run 16-22psi down the track

[SS8_Gohan]

yep, stock is fine for that ran about 20psi on my GT-T with E85, 280-290rwkw - just bolt-ons, nothing special

[GotsWapan]

Did you run a forward facing plenum? If so where did you mount the bov?

[SS8_Gohan]

ahhh. you've got a FFP, nope my had the standard cross-over job.

what plenum you running?

[GotsWapan]

I haven't got it yet. Thats down the track. Thinking plazmaman plenum + throttle body.

Fixed the back firing, had to adjust a setting fuel setting on the Wolf Handset.

[Rolls]

I haven't got it yet. Thats down the track. Thinking plazmaman plenum + throttle body.

Fixed the back firing, had to adjust a setting fuel setting on the Wolf Handset.

What fuel setting?

[GotsWapan]

Fuel cut recovery I think it was called.

[HYPED6]

I've heard the japs don't even use AFR they just use exhaust temp and go rich as hell and smash the timing into the motors.

This is good. Engines out of cars should be able to be used in boats...... and held flat for a day or 2.....

They live long and happy lives then.

[STATUS]

Wow, ile show you a pic of my SR20's piston when I tuned it to 12.5:1, half the side of the piston melted lol was at 18pound though. I'd never tune above 12:1 now.

what is your peak timing @18psi? what where the egts?

The difference between 2 degrees of timing to effect detonation is as much as going from 12.6:1 A/F ratio to 12.0:1 (or 12.0:1 to 11.4:1).

[GotsWapan]

Where are these quotes coming from?

[Rolls]

what is your peak timing @18psi? what where the egts?

The difference between 2 degrees of timing to effect detonation is as much as going from 12.6:1 A/F ratio to 12.0:1 (or 12.0:1 to 11.4:1).

I found something similar in practice, on a hot day with my old tune 3rd gear ~18psi rattled like crazy, could hear the det without knock ears, a minute later 2 degrees out of peak torque and we could idle the car for 10 minutes getting the coolant >85c and it still wouldn't ping in 3rd even listening on the ears.