and those long term effects are?

as long as we're not talking about significantly overfull you're not going to get oil frothing issues, and there is no oil being puhed out of the crankcase breather so i can't see there being a problem.

 

I've done Bedford once in my old S and twice in the current one with no issues.

Last time was Aug Bank Holiday and it was a *very* hot day, with no problems whatsoever.

So I think there is an issue with the car (and there my technical input ends )

 

thanks for the input guys!

 

AAAAAAAHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Part-throttle lean-out!!!!!!!!!!!

That is bad engine management mapping, they all do it.

You cannot run at those speeds on part throttle - I tend to get it whilst waiting to overtake in second. Soon as the throttle passes 3/4, it's fine again. Otherwise it's fits n' starts.

I would suggest that possibly it is an unconcious driving style thing - the offset seating makes you apply the throttle a tad slower in LH bends or something?

A technique is to short shift on long bends & use full throttle to get it back into VTEC - apparently it's a quicker, if less exciting driving style.

Or do the Senna-style 3/4 to full throttle cadence in 2nd, & drift the rear -takes practice!

 

The lambda isnt used on VTEC, its passive.

Nick is right I would say, and ive seen it one other cars. There's a transition point (if its the same as an impreza) between the ECU staying closed and open loop and it doesnt like being there too long.

On the Subaru it would totally sap power if held at certain revs, and it was done for emissions reasons, ie, a fiddle!

The Honda may well be the same.

MB

 

Oil contacting the crank and whipping it up for one. If the oil foams it will struggle to find an escape route via the PCV, as its designed to expel "vapour"

If you're happy with it then ok, but I wouldn't advise people to overfill the car with oil. A high level is sensible on track though, given the surge potential and the fact the car drinks oil!

MB

 

if you seriously overfill it then i agree, but i'm talking about a couple of mm over the max line on the dip stick, and i'd be veru surpised if there was not enough tolereance in oil fill levels to allow for that without the crank contacting the oil and foaming it.

also, don't forget that at prolonged high revs there will be more oil at the top end of the engine than ususal so the level in the sump will be lower anyway.

 

i hadn't thought of letting a mate drive the car (to highlight the problem with my driving style - there's me trying to be fast and smooth and i fook it up!

bless!

 

Interesting topic...

 

Just to elaborate, foamy oil doesn't lubricate (air is compressible!) and it chops up the long chain polymers.

Fill the oil to the normal level. Even with increased consumption, since you're only doing a couple of hundred miles on a trackday, it won't matter. Just check the level now 'n' again.