Engine stutter on sprint track

chrismc · Post by **chrismc** » Thu Apr 11, 2013 8:07 pm

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

toyracer69 · Post by **toyracer69** » Fri Apr 12, 2013 12:09 am

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.....

Post by **Doggo** » Fri Apr 12, 2013 1:12 am

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.

chrismc · Post by **chrismc** » Fri Apr 12, 2013 7:44 am

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

Post by **lewd lude lover** » Fri Apr 12, 2013 7:58 am

plugs, check your plugs and timing.

chrismc · Post by **chrismc** » Fri Apr 12, 2013 8:51 am

lewd lude lover wrote:plugs, check your plugs and timing.

Both fine- double checked on Monday as it was going on the Rolling Road

Buzzonion Vtec · Post by **Buzzonion Vtec** » Fri Apr 12, 2013 9:05 am

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

chrismc · Post by **chrismc** » Fri Apr 12, 2013 10:34 am

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!

Post by **Doggo** » Fri Apr 12, 2013 8:56 pm

Nice problem to have

Buzzonion Vtec · Post by **Buzzonion Vtec** » Fri Apr 12, 2013 10:47 pm

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