Tune For Racing ?

[FPVF6355]

Had my first time on a track recently, car went really well until the temps came up.

For street use the car runs great.

after 3 laps on sandown, it was all down hill, temps were reading in the middle of the gauge, spitting big puffs of fuel vapour out the back, backifiring at WOT.

fault codes all fuel and air mixture related. Power dropping down by 30% until backing off the throttle. it was like driving a car with a sick carby on a 40 degree day sh*te !!

1 cool down lap and back in business for 2 laps then too hot again.

as the day went on it just got annoying and worse.

Next day car ran fine on the street even at WOT.

Can anyone tell me if this is typical of the fords ecu adjustment abilities or is there something wrong with my car ?

Should I have a seperate tune for track use ?

BA typhoon with 60lb siemens, 3.5" dump, 290rwkw, intercooler water spray with temp controller. 0.75 gapped ford plugs, new sensors all over, new ford coils. plasmaman valve springs

Street fault code (system too rich)

Fault codes on track day p1311 (lean)

Had it dynoed before track day was trimming fuel below 4000rpm, no trimming after 4000 to redline (running rich up to 4000rpm)

As soon as it got hot it was a pig.

Any thoughts ??

[MattyP]

Your cooler and fuel system may not be up for it

Sounds like the ecu is doing the right thing and protecting you from blowing it up

[Wilko16]

Yeah it's dumping fuel in to save it self! Backfire at WOT means very rich

[Mr_4.0]

Backfire or misfire?

Misfire and puff of smoke can also indicate detonation.

["Captain Retard"]

Nothing will test out a car or bike like a track day.

I once thought I had a fairly well sorted street sports bike, 3-4 laps around Eastern Creek and I had all sorts of issues.

You know you've got a good machine when you can do a dozen track laps and the car comes in behaving the same as it went out!

It gave me a whole new appreciation for race cars and bikes.

[FPVF6355]

Backfire or misfire?

Misfire and puff of smoke can also indicate detonation.

Not a miss fire, more like exploding unburnt fuel in the exhaust, followed by a big ploom of fuel vapour behind me. Pulling out of corners.

Going to pull turbo off and see if there is a leak near turbo. Had similar issue once before tightened up the dump pipe bolts and it was then fine.

The recent issue is similar just worse, Like Captain Retard said track conditions are Soooo much different to street. Which is why I'm asking if it needs tuning for track specificly.

There was a race BF typhoon with 360rwkw that ran no probs with stock IC. At 200km there is plenty of air flow, heat soak is not an issue. It's Air fuel ratio in relation to engine temp.

It was tuned to run quite cold, thermo fans kick in early. even on a 40 degree day (street) it never gets that hot (gauge needle pointing to first mark on gauge) On track guage pointing straight up to middle of gauge. Cooling down laps with needle back to first mark, car runs fine again until needle reaches middle of guage.

["Captain Retard"]

I think it is a heatsoak problem but like you said something is causing it to get hot first.

So it maybe running on the lean side.

The problem with heatsoak is although your getting plenty of flow in, you still have to get that hot air out.

Is your car really low?

But obviously you have to work out why its building up so much heat in the first place.

[FPVF6355]

I think it is a heatsoak problem but like you said something is causing it to get hot first.

So it maybe running on the lean side.

The problem with heatsoak is although your getting plenty of flow in, you still have to get that hot air out.

Is your car really low?

But obviously you have to work out why its building up so much heat in the first place.

It is low, but I think the thermo fans being on the whole time on the track would restrict air flow ??

Even so the needle in the middle of the gauge is not rediculously hot I would have thought. Just too hot for the current tune ?

Got to remember the car is redlining in every gear constantly for 30 minutes flat. using 1/4 tank every half hour.

Edited 09/09/14 12:07 AM by FPVF6355

[Rab]

The engine temp may only be showing half way on the needle, but the inlet air temps will be right up there.

Feel the heat under the hood after a few laps - that's what's effecting the mix.

The engines cooling system may be fine for the engine itself, but the air that's going into the turbo is what's getting warm - the intercooler isn't getting enough heat out of the charge and that's what's messing with your mixture

["Captain Retard"]

Even with the sprays it sounds like you can't get rid of the heat build-up under the bonnet.

I've got a ba Typhoon but never had it on the track.

There are a few guys on here that do regular track days, it might be worth searching their threads for some answers.

How were the brakes holding up?