Right, dont know if many will fancy it, but ive got a forum trackday going on the BMW Forums, and zeds want to join in?

 

Its looking like Castle coombe on 4th October.

 

Were getting it discounted from a usual £149, to £129.

 

Nobody else on the track but us!

 

Should be fun...

 

Names please..

 

1. Big jim

2.

how does or why does the cars make the flame out the exhaust ?

 

Usually a sign of massive over-fueling tbh, it happens when there is too much fuel in the chamber, and it's still alight when it gets thrown out the exhaust. Some of the more knowledgeable peeps on here like Yowser can probably give you a more definitive answer on that though.

so thats kinda bad would u say ?

Yeah can be pretty bad, flames through your turbo for one thing, then through your back boxes, plus your back bumper has to be pretty retardant :D Plus there's things like bore wash etc.

 

In the end I found the GTR did it, because it had a Mines 1.0Bar ECU and I mostly ran it at 0.7Bar, plus it had larger injectors, plus it had a Veilside 4" turbo back exhaust with only one box on it, so it was feckin loud and there was barely ANY back pressure at all. Never seemed to do the car any harm, was the oil pump that killed it in the end, not bore wash or turbo failure or anything. The guy who bought my engine just replaced the oil pump, got the thing properly cleaned up, bored etc. and put it in his track car, never heard of him having any issues with it afterwards.

No point it painting it until after you get the crash repairs done at the track!

haha just caught up with this thread, sounds like there is going to be some grudge matches out there... :lol:

 

my low powered LWb will have to stay out the way ... :crying: not sure i have enough power to play with the big boys,:blushing:

 

mines the techni-colour Frankenstein made up of many different Zeds...:wack:

Yeah can be pretty bad, flames through your turbo for one thing, then through your back boxes, plus your back bumper has to be pretty retardant :D Plus there's things like bore wash etc

 

You get flames from the exhaust when unburnt fuel has passed through the engine - fair enough. But it doesn't ignite until it reaches outside the exhaust. It can't ignite inside the exhaust because there is no oxygen for it to burn.

 

It is always much better that an engine should run rich rather than lean, but too much either way will effect performance or kill the engine. Overfuelling was a technique of cooling the pistons in early turbo engines.

 

If you get your engine tuned you could always ask the tuner to have it pop a little extra fuel in on the over run for a little snap, crackle and pop. Depends who you ask, but it shouldn't do any harm or grenade your exhaust..

How exactly do you propose, that a fuel which only ignites with a spark and not with heat, ignites outside the exhaust? I looked into this when I had the GTR, because I was under the miss-belief at the time, that it ignited IN the exhaust from the heat of it, but no, it cannot do that, it requires the spark, there is far too much momentum inside the exhaust, for the gases to reach the spark plug, from the tip of the exhaust, so where would it get it's ignition source? It's fuel which is ignited inside the champer, but then gets fired down the exhaust as a flame seeking oxygen, not as a gas seeking oxygen to ignite with, only to find no ignition source, lol.

Petrol has a flash point, as does any 'fuel' or substance.

 

A flash point will cause any source of 'fuel' to sponteaneously combust in an oxygen rich environment - no spark or flame required.

 

Hot gases - saturated with fuel - reach a source of oxygen = flame.

 

Simple.

Or put a spark plug in the tailpipe!

how do you pay. is it on the day or before

Before.

I'll find out how we book.

 

Cheers

Right then, time to sort the men out from the boys...

 

Whos in?

 

Pm me and i'll send you the link and discount code..

sounds good at what track ?

Castle coombe near Bristol mate. 4th October. £129

oh thanks .. not for me this time its 140mile trip there

 

 

Mark

Thats part of the fun!

Took me 3 hours to get to Cadwell, well worth it tho.