985cc Turbocharged Nova Sprint Car

[16xe_chris]

From the photos provided I would put money on that being caused by understeer, due to the forward weight distribution.

Tripodding as you say is good to a certain extent

[novarally]

Just a few more photos (I won't publish all of them!), but these do show the tendency to lift a wheel;

[16xe_chris]

Did it feel understeery??

This was when I realised my front springs were well far too soft, but I didn't have the option to change anything this particular day, so I just got mad and kept my right foot planted

[mowgli]

are you allowed any lower front aero?

[novarally]

Did it feel understeery??

No, it didn't feel bad at all on that front. But I was also so distracted by the misfire that I wasn't concentrating too much on the handling.

[novarally]

are you allowed any lower front aero?

Yes, and I really do need a proper carbon fibre splitter/undertray at the front. But finding someone to make it at a realistic cost is proving difficult.

[burgo]

would it not be worth making a plyboard one just to see if you feel any benefit before shelling out for a carbon one? you can experiment with different designs much easier as well

[novarally]

would it not be worth making a plyboard one just to see if you feel any benefit before shelling out for a carbon one? you can experiment with different designs much easier as well

Possibly it would, the biggest problem is going to be finding something solid at the front end of the car to mount a splitter onto! An aerodynamicist friend of mine once told me that if you can't stand on a splitter and it supports your body weight, you may as well not bother..........

[novarally]

Right, who's an expert on OMEX ECU's?

I've just changed the spark plugs and the coilpack, with absolutely no difference to the misfire.

It starts missing at a shade over 6k rpm, and I'm starting to wonder if the internal rev-limit in the ECU has somehow reset itself? Is this possible? Maybe there's a default setting for Omex units at 6,000 rpm? I've done a fair bit of Googling with no useful info so far.

The rev-limit has always been set at 8k rpm, but I must admit I never revved it up to 8k at a standstill to see what it did. So I may be wrong, but it seems to me that at 6k rpm it's behaving just like the rallycross Supercars, where they just bury the throttle pedal and the electronics hold it on the rev-limit, with all the popping/banging which goes with it.

BTW - I don't have a PC lead or software for the Omex, so I can't check it, before anyone asks........I will get myself a data lead and software tomorrow and plug my laptop in.

[lee303]

changing the rev limiter is simple, pretty sure its just a drop down box, in general engine settings or similar, doubtful it reset itself though tbh
you should also be able to see in the data logging if the crank sensor is giving a fault