Had my car on the Dyno today, best run was 407bhp but it started climbing out the rollers so they had to stop as it was affecting the readings. The car had a misfire at higher revs too apparently, as it went on the rolling road it certainly wasn't running on all 6 then seemed to clear.

 

I took a video and I would appreciate it if anyone can advise me on the smoke, what it could be and how to sort it, thankz :)

 

 

 

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Edited June 1, 201312 yr by Baz

Cant see the video m8..

Doh thanks for letting me know Lee, I'll try again..

[video=youtube_share;896SPfRoSXo]

**** it I give up trying to get a video on here :(

 

Edit: thanks mark was just about to hang myself lol

looks like overfuelling !

Mikey youve really become unscrupulous..

 

the plates worth that alone and I wont break it.. £550 Baz.....

yeah does look a little rich for the boost setting

yup, running very rich, did they log AFR for the run?

Is the fueling set by the ecu map? It's got a Greddy Profec B Spec 2 which I'm not used to yet, instead of setting the boost level i.e 1.2 bar you have to set the gain such as 35% over stock. I haven't changed anything on it but not sure if its been set up badly.

yup, running very rich, did they log AFR for the run?

 

Yes mate I don't really understand it but sure you lot will :)

 

the afr wasn't logged by the dyno to the look of it

 

running rich or lean is governed by the map set on the ecu to a point then uses the Maf on how much air/load is needed

but if the boost setting is to low for set tune it will run even more rich hence black smoke

:huh:How many miles per gallon for this one?

turn up the boost till the black ssmoke goes away :D lol

the afr wasn't logged by the dyno to the look of it

 

running rich or lean is governed by the map set on the ecu to a point then uses the Maf on how much air/load is needed

but if the boost setting is to low for set tune it will run even more rich hence black smoke

 

Which Graph are you looking at? Also ECU doesn't monitor lambda on full throttle, it goes off the fuelling tables based on MAF readings.

 

Boost setting doesn't matter, the ECU should be tuned for any given load value....

Baz,

 

AFR is in the high 10's hence the smoke. Either the ECU us way off, or you have a boost leak, or both!

 

PS if a dyno operator can't keep the car hooked up at 400hp, go somewhere else in future

Thanks for the serious answers mate, very helpful indeed :)

 

 

Will get my boost leak checker on it in the next couple of days, and in for a Remap at some point. The rolling road is quite well known in this area, the Z was strapped down but was wheelspinning and climbing out the rollers so no idea why.

 

As for fuel usage, about quarter of a tank today, 100 mile round trip plus the Dyno, quite reasonable. Sure the gauge will plummet next time I get in it though :lol:

I was expecting to see AFRs in the low 10s or even a couple of dips into the 9s with that amount of black smoke in places.

 

 

PS if a dyno operator can't keep the car hooked up at 400hp, go somewhere else in future

 

^^This!

 

One of the reasons why I use a single roller dyno, the VG is a torque monster :D

As everyone else has said that is over fueling like a pig! get that boost leak checker on there barry, come on this is school boy stuff you already know :P. Its probably riddled with boost leaks. whats it running uner the bonnet for those 400+ horses, if its putting that down running rich like that it will run so much better when its sorted, and I bet if that's that much crap coming out the back the plugs are probably fuel fouling hence the intermittent misfiring. On the plus side at least its not running lean hahaha

I was expecting to see AFRs in the low 10s or even a couple of dips into the 9s with that amount of black smoke in places.

 

 

 

^^This!

 

One of the reasons why I use a single roller dyno, the VG is a torque monster :D

 

Is this also something to do with the way the viscous diff works because it cannot lock 100% one wheel is never putting down the exact same amount of torque as the other so the car wants to walk forward? is that the correct assumption?