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Quote:
Originally Posted by novarally
It sounds to be electrical though i wouldve thought, so fingers crossed its not going to be an internal issue as that would throw up a misfire all the way through the rev range wouldnt it?
That's certainly the logic I'm working with, so I hope we're right.Quote:
Originally Posted by Spudly
Quote:
Originally Posted by novarally
Ill keep my fingers crossed for you then bud :thumb:
The photos have been really useful, as they explain the first of my 2 spins..........clearly I was completely out of control before I even got to the corner I spun on...........
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I'm putting this spin down to the new Tran-X LSD. It's a wild ride with a diff like this, and it does make the car weave, you really have to hold on. With the previous Quaife ATB it was very easy to drive, but lacked the ultimate edge that a plated LSD gives you.
Also driving a glorified kite must be a skilled occupation? lol
Looking good on the track Colin
Plated tran x diffs are really something else, wait till its a damp day and you really do go where the grip is ha ha, makes you feel like your weaving all over the place.
What heat rating are the plugs your using, I've known them be an issue when the revs go high also known turbo engines to blow out the spark!!
Just noticed with the very top picture whilst you were turning in your car was already on 3 wheels, this won't help much with under steer and the potential to spin if the other remaining tyre brakes traction?
Higher poundage front springs maybe?
tripodding doesn't cause under steer at all, the opposite in fact and is usually very desirable to give you more turn in hence stiffening the shells so much to get it lifting the wheel
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i LOVE that photo...i see shiny stuff...looks awesome
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
Just a few more photos (I won't publish all of them!), but these do show the tendency to lift a wheel;
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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 lol
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are you allowed any lower front aero?
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.Quote:
Originally Posted by 16xe_chris
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.Quote:
Originally Posted by mowgli
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..........Quote:
Originally Posted by burgo
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.
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
Thanks.Quote:
Originally Posted by lee303
I'm also doubtful that it could have reset on its own, but you never know with computers.
I haven't replaced the crank sensor yet, but I have a new one ready to be soldered into place.
Have you got full throttle gear shift setup on your omex, my R5 turbo had a similar fault at 5k after we had done some welding and refitted the dash, turned out I had forgotten to connect the clutch pedal switch so the ecu was cutting the revs ready to flat shift, also sounded like a rally car and firing flames out the exhaust!
That's interesting, but no, I don't have that set-up on my ECU (not yet, anyway).Quote:
Originally Posted by nova23
I can't remember seeing this photo before (from last year), and there are some good photos of other Novas in competition here;
http://www.zipp.co.uk/search/gallery/nova
ah cool link - didnt know mr turpin was still running his nova, in hillclimb.. need to find a vid..
The misfire has now been cured, by the simple fitment of a new crank sensor. We've fitted a new plug onto the wiring loom so that I can carry a spare at all times, as they seem to be rather unreliable.
It's like a new car now, the way it revs up to the 8k rev-limit is incredible, with only 5kg of flywheel and clutch to spin!
Can't wait to take it testing now, there's still some other small niggles to be ironed out.
At least as a result of this I've now got the OMEX software on my laptop, and a Comms lead so I can plug in and interrogate the ECU if I need to.
Please you have bottomed it out, always nice to be able to check the ecu.
Looking forward to seeing your car in a couple of weeks (and yourself of courselol)
having had nothing to do with crank sensors, i assume they work the same as abs sensors, with an exciter ring.. i swap a lot of abs sensors on wagons, and have even had new ones that are faulty.
glad you have the power back, now its time to play with your suspension again..
Overdue for an update on this, which will follow soon in words and pictures.
I have trimmed back the rear arches, which in combination with machining 5mm off the rear hubs was going to allow me to lower the rear end much more. But unfortunately the hubs are too big to fit in my friends lathe, so I need to find someone else to do that job.
Today I've bought a new trailer for my Nova.......I hope it's happy now, it's going to have better accommodation than me.
Race shuttle?
Sprint Shuttle (a little easier for the towing as I don't want to be using a juicy 4x4).Quote:
Originally Posted by Mike
Oooh nice one.Quote:
Originally Posted by novarally
http://www.derbyracingservices.co.ukQuote:
Originally Posted by novarally
Myself and mates have used them a few times now and they are very good. They did the hub machining for Iain, drop him a note and see what he says about them.
Thanks, but I need to find someone local as we always seem to be coming up with machining jobs that need doing on mine, and various friends race cars.Quote:
Originally Posted by Harvey
Hopefully I have found the place today, I'd never heard about it before, but just a couple of miles from me there's a farm, and one of their buildings is packed full of ultra-serious machinery. The boss wasn't there when I dropped in, so I'm going back later to meet up.
Just got the rear hubs back this morning after having 5mm machined off them;
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I'll get them re-anodised at a later date, I want to get the front alloy bells done in gold anyway, so I'll get everything done together.
In combination with trimming back the arch lip, it's allowed me to drop the back end right down, it looks miles better and should improve the corner weights/handling;
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How are the bike brakes colin, did you get the idea from autograss/spaceframed cars ?
I'm not 100% sure yet......the engine was running so badly at the first race meeting the brakes didn't really get stretched. The feel is OK, but I'll reserve judgement on overall performance until I get chance to do more testing.Quote:
Originally Posted by calibra-keith
Put it this way, I haven't sold the old Wilwoods yet. They will only go up for sale if/when I am completely happy!
No Centering on rear hub?
conical nuts... proper old school
Inspired by conversations at the National Weekend, and seeing an Autotest Nova at the PPC Show at Mallory Park, I decided there's still more weight to come out of the doors, so tonight I attacked the passenger one;
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Including lightening the locking mechanism there's nearly half a kilo out of that door, and the same to follow from the drivers door.