EVO8LTW

iTrader: (41)

But still possible to bust a piston if you have too much cylinder pressure!

How do you bring E85 to the track for lapping days? I’ve calculated I would burn nearly a drum in a weekend.

Turtletron

iTrader: (1)

I actually made a tune earlier that was down in the 10.6-10.9 range first but figured I might be too rich and I was still getting knock. But that was with 3 degrees advance in the 3500-4000 area so I'm glad I still have room to play with.
Do you spike your fuel with race gas during track days?



I agree, I didn't plan on just copy/pasting someones tune I just wanted to see what others have had success with in a high heat/stress environment.

Ayoustin

iTrader: (2)

Cylinder pressure doesn't break pistons. Detonation causes spikes of cylinder pressure which can crack rings or ringlands. The only exception woulf be if your timing is so far off that the car is getting preignition and creates so much heat that cylinder pressure pushes through the middle of the softened piston.

I bring 5 gallon jugs with me. Go through 20-25 gals a day roughly. Go to the mearest station and refill at the end of the day.

kyoo

iTrader: (29)

i saw a little bit of knock on my 3rd gear pulls map - tuner said it was likely the egr leaking, hence i'm addressing that next. if it still knocks after that, we'll pull back some timing, but otherwise i'm only running 24psi, minor bolt ons ~310hp so i'd be surprised if it's that much strain

LetsGetThisDone

iTrader: (1)

I don't run pump gas at the track, 3* at 20psi should be ok-ish. How much knock it it have? Maybe try 1* at 3500, and 3 or 4* by 4500.

Ayoustin

iTrader: (2)

Check to see how many counts of knock it actually is picking up. I write anything under 2 off as just noise or not harmful.

kyoo

iTrader: (29)

i haven't found a way to datalog ecu knock on track, i always use laptop, won't really work out. it's random though, usually around top of 3rd or 4th, will flash the CEL a couple of times.

Ayoustin

iTrader: (2)

Yea my **** flashes all the time. As I said, I'm on E85 and as long as AFR looks good there's no chance in hell I'm actually knocking.

kikiturbo

Running OE tank, we saw LOTS of knock after left handers.... pump likes to go dry there when you run under 1/2 or 1/3 tank.. ..

Biggiesacks

openport 2.0 in standalone logging mode should do it.

LetsGetThisDone

iTrader: (1)

Considering English Racing is his tuner and not some sooper dooper e-tooner, I think he should listen to Aaron on this one.

They have proven aged EGR valves can leak, hurting power by as much as 20whp and causing knock.

LetsGetThisDone

iTrader: (1)

Again, he needs to listen to Aaron. Because the stock ECU has good knock control, Aaron sets the flash CEL on knock fairly high. So when it does flash, you should actually address it. Aaron knows what timing works at what boost and what AFR. He's done enough testing and tuned enough cars. Kyoo needs to follow his advice.

Biggiesacks

you REALLY don't want let your EGR leak, aside from the tune, it will torch your ISCV. These things just go bad like the throttle body shaft seals. Plan on replacing it fairly regularly (like with the timing belt) if you don't block it off. I remember a thread, probably by English, about how they started leaking at 60K ish miles.

kyoo

iTrader: (29)

yea and i am - ordered the blockoff plate and will bolt that on and go back out and see how it does. if it still knocks, then we'll see what is going on with it.

my car's got about 40k on the clock, but aaron indicated it can be as much age/usage as it is straight mileage

Ayoustin

iTrader: (2)

At no point have I said he should disregard what his tuner says, nor did I say a leaking EGR won't hurt anything. What I'm saying is if you have lots of octane, and there isn't a mechanical issue with the engine, it's most likely not real knock.