Haze in the exhaust at WoT

[Z0m81e]

Hi all,

My brother was following me earlier and text me after to say when my vxr8 is being 'given the beans' there is a light haze in the exhaust. He says definitely not oil, maybe unburnt fuel. Can anyone comment if this is something to be concerned about? Car was fully warmed up all gauges normal at the time. I've listed the full details of the car below for the sake of completeness.

57 plate LS2 VXR8
Walkinshaw headers, sports cats, bi-modal exhaust
Monkfish magic cam
High ratio rockers fitted by mf with the cam
Fast 102 Intake
VCM OTR

Everything else stock to my knowledge. Car was mapped by Monkfish at the same time as the cam/rockers/intake were done and nothing has been changed since) which was about a year ago, car hasn't done a huge number of miles since maybe 4K tops for about 27k total. One further possibly relevant detail, I took the car to a local RR about a month ago as I wasn't convinced it was pulling 'properly' and they refused to run it after putting it on their diagnostics machine. They identified a fault with the MAP sensor which I replaced with what as best I can tell is an equivalent Delphi part as the original AC Delco branded ones seem hard to find. After swapping it I removed It's going back in a week or so to hopefully run then which might give more details.

Anyway, can anyone comment if a light haze would be 'normal' under WoT, is it something to worry about? If so is it likely to be overfuelling in the map or something else?

cheers,
Paul

Edited by Z0m81e on Sunday 9th October 10:38

[Aitch 'H']

If it's as you open the throttle then as far as I'm aware it will over fuel momentarily to compensate for the WOT after normal driving as you've got the monkfish magic cam etc, but it shouldn't be doing it all the time. So if there's a haze as you open it up and start to pull away I believe that's normal, it it's all the time then probably not.

[TonyTwoTribes]

could be numerous things. If running fine and not using oil I would not worry . Even the lower ambient air temp and air moisture content can make a difference (condensation in exhaust pipes?) . gauges all fine + Oil level all good = Drive it and enjoy it.

[Behold81]

Mine overfuels a lot. Still trying to tune it out. The Wideband seems fine most of the time. I seem to have an adder table causing my issue. Super enrichment is happening.

[monkfish1]

Z0m81e said:

Hi all,

My brother was following me earlier and text me after to say when my vxr8 is being 'given the beans' there is a light haze in the exhaust. He says definitely not oil, maybe unburnt fuel. Can anyone comment if this is something to be concerned about? Car was fully warmed up all gauges normal at the time. I've listed the full details of the car below for the sake of completeness.

57 plate LS2 VXR8
Walkinshaw headers, sports cats, bi-modal exhaust
Monkfish magic cam
High ratio rockers fitted by mf with the cam
Fast 102 Intake
VCM OTR

Everything else stock to my knowledge. Car was mapped by Monkfish at the same time as the cam/rockers/intake were done and nothing has been changed since) which was about a year ago, car hasn't done a huge number of miles since maybe 4K tops for about 27k total. One further possibly relevant detail, I took the car to a local RR about a month ago as I wasn't convinced it was pulling 'properly' and they refused to run it after putting it on their diagnostics machine. They identified a fault with the MAP sensor which I replaced with what as best I can tell is an equivalent Delphi part as the original AC Delco branded ones seem hard to find. After swapping it I removed It's going back in a week or so to hopefully run then which might give more details.

Anyway, can anyone comment if a light haze would be 'normal' under WoT, is it something to worry about? If so is it likely to be overfuelling in the map or something else?

cheers,
Paul

Edited by Z0m81e on Sunday 9th October 10:38

if your new map sensor does not perform exactly the same as the old one, this could influence how it runs. I havn't seen the exhaust, but i would be inclinbed to fit an OE MAP sensor first before doing anything else.

[Z0m81e]

Thanks for the feedback all.

monkfish1 said:

if your new map sensor does not perform exactly the same as the old one, this could influence how it runs. I havn't seen the exhaust, but i would be inclinbed to fit an OE MAP sensor first before doing anything else.

They seem to be really hard to find, i'm pretty sure I gave you call and you didn't have any? but if you do i'll take one The one I used is a Delphi PS10002-11B1 which is listed most places as a direct replacement for OE 16212460 (delco 213-331) which was what I removed though i'm more than happy to replace it with the actual delco one if I can find one.

Paul

Edited by Z0m81e on Monday 10th October 23:48