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Engine stutter on sprint track
Posted: Thu Apr 11, 2013 8:07 pm
by chrismc
Suffered this on track at Curborough on Tuesday a couple of times. Felt like the engine momentarily cut completely
Occurred during a fast direction change left to right doing an indicated 7k+ rpm. It definitely wasn't hitting the rev-limiter though
I did wonder if it was losing VTEC (I don't have a baffled sump) but was only on road tyres & not going really quickly. Checked oil level afterwards & it was right at the full mark!
I also thought maybe fuel starvation- but had just over 1/2 tank?
Didn't occur anywhere else on track....
Anybody got any other ideas?
Chris
Posted: Fri Apr 12, 2013 12:09 am
by toyracer69
Have you checked the oil level after it cooled down as I suspect you suffered from loss of Vtec due to low oil level. It feels like its holding back all of a sudden.....
Posted: Fri Apr 12, 2013 1:12 am
by Doggo
I've had that kind of starvation not infrequently on an old Peugeot 309 (Petrol carb) and a new Volvo S40 (Diesel) directly after long (relatively!) high G corners (Normally 270ish degree), sometimes with a fair bit of fuel in there, although maybe not half a tank. Not sure if you should discard starvation completely? No idea what Ludes are like for it as I'm new to mine, but it wouldn't surpise me if a hard left/right could cause a momentary blip in fuel - especially if it was repeated at the same place?
Others will know more, doubtless.
Good luck with it.
Posted: Fri Apr 12, 2013 7:44 am
by chrismc
toyracer69 wrote:Have you checked the oil level after it cooled down as I suspect you suffered from loss of Vtec due to low oil level. It feels like its holding back all of a sudden.....
Yup! Left it to cool down and double-checked the oil level & found it bang-on the top mark!
Il probably change fuel filter & clean the VTEC solenoid screen. Can't think of anything else
Posted: Fri Apr 12, 2013 7:58 am
by lewd lude lover
plugs, check your plugs and timing.
Posted: Fri Apr 12, 2013 8:51 am
by chrismc
lewd lude lover wrote:plugs, check your plugs and timing.
Both fine- double checked on Monday as it was going on the Rolling Road
Posted: Fri Apr 12, 2013 9:05 am
by Buzzonion Vtec
Chris, you need a baffled sump mate. You are dropping pressure momentarily which is dropping vtec out.
Also, run it 5mm over max mark - cold - for track use
Posted: Fri Apr 12, 2013 10:34 am
by chrismc
Thanks Rich
A baffled sump was on the shopping list when I get some proper track rubber- but if its already needing one that's fine
It's that new suspension, diff & geo making it corner faster that's causing the issue then!
Posted: Fri Apr 12, 2013 8:56 pm
by Doggo
Nice problem to have
Posted: Fri Apr 12, 2013 10:47 pm
by Buzzonion Vtec
chrismc wrote:Thanks Rich
A baffled sump was on the shopping list when I get some proper track rubber- but if its already needing one that's fine
It's that new suspension, diff & geo making it corner faster that's causing the issue then!
Indeed it is
Shout when you're ready and I'll sort one out for you