willizm

iTrader: (10)

So I went to the track a couple weeks back and have some logs to share. I'm really shooting for 9's but came just short at 10.1@135mph. I'm making some strides with my launch getting it out on a 1.5 60' and hitting the 1/8th at 6.531@108mph but then I feel as though the car is falling on it's face a little. It was mid 80's that day and looking at the logs I see that the IAT's are climbing up to 165* at the traps and seeing no KR anywhere. I have an IAT correction table that pulls timing so it drops up to 5*. I think i'm working the little pt7675 a bit at 21.5psi so maybe thats why IAT's are rising.

Now I have 3 options here from what I can tell. I'd like to hear what you guys think given that i'm on e85 pushing 21.5psi. Car is heavy at 3850# with me in it.

1. I can drop down or wipe the IAT Timing correction table and see how it does. I'd imagine that e85 would keep the cylinders cool enough to thwart off any detonation from rising IAT's and heat in the cylinders. Easy to do but not sure how much iat i can push on e85

2. I can ditch the CX Racing intercooler and get a better unit. semi effective with some cost

3. I can spray meth but would probably need to retune the car. Most effective but more costly.





What are your thoughts?

willizm

iTrader: (10)

BTW, the weird dips in IAT and timing have something to do with my cable so don't worry about that.

Wicked69

This is me but 165 IAT's are not bad at all at the end of a 1/4 mile pass on E85. I have seen 240's with no intercooler. I got so tired of messing with the KR on mine I just eliminated them all together. You can still set it up so it pulls timing if IAT's or coolent etc.. Are too high. Your IAT's are what I see on E85 at the end of a 1/8th mile pass and I don't sweat it. Remember you are measuring the IAT's before the fuel has a chance to cool the cylinder temps.

Ryans99ls1

iTrader: (16)

What do your IAT's start at?

RedRocketZ28

iTrader: (19)

My IAT's are similar after a run, or a pull on the interstate. Question though, is your wideband not hooked into the scanner? Just wondering why the AFR was showing what it is.

Forcefed86

iTrader: (4)

As said nothing wrong with 160* inlet temps. Thats actually pretty good. I'm sure the pressure drop is horrible though.

I see roughly the same at 20lbs with the CXracing intercooler 32x12x3, 5.3, S475. I pull no timing and run around 12* at peak torque. Then bump up to 18* by 7k.

What is the base timing? As long as it isn't anything too nutty I don't see the problem. To be safe drop the amount of timing pulled a degree at a time and watch the plugs. I doubt you will have an issue removing all of it.

12.7 on the WB02 seems pretty lean too if that's accurate.

samdogmx

iTrader: (14)

leave the timing in at 160. Thats not bad at all.

I ran no IC / E85 last year and I didnt take any timing out until it was 240+ Although I had very little timing in it anyway. What does your timing table look like?

willizm

iTrader: (10)

They start right around 100-105*. I was giving it some time between runs to let it cool down.

Thanks guys for the idea's. I may do another pass and drop the table down so that it only pulls 2* of timing over 150* and see what the logs look like. If that is ok then I may 0 out the table and see how it does. Seems like many guys get away with screaming IAT's on e85.

willizm

iTrader: (10)

JustAFooL

iTrader: (45)

Still learning but this seemed like the right time to ask because I may have been confused all along.. Do you start pulling timing when you get into boost or because your IAT's are climbing?

willizm

iTrader: (10)

I am as well but the table below is the one that basically determines at what iat timing would be pulled factored off of cylinder pressure. You can see that once I start getting over 160* the pcm will start to scale back up to 5* of timing. If I change those 5's to 2's then as IAT climbs I'm only pulling 2* of timing(also change 3's and 4's to 1's or 2's). If i'm wrong, please correct.

JustAFooL

iTrader: (45)

Cylinder pressure being boost, correct? So pulling more timing will help with detonation I'm guessing?

Ryans99ls1

iTrader: (16)

Rising 60* over a 1/4mi pull really isnt bad at all, especially if you are starting at ~100*

My tune is super safe as im still on a stock bottom end, but we start pulling timing at 140*. With you being forged, I wouldn't worry at all where your temps are at.

RedRocketZ28

iTrader: (19)

I just looked at a log from my best pass on Saturday. My IAT's went to 135* by the end of the 1/8th. It was in the mid 80's that day here.

So, what's up with the wideband reading...?

willizm

iTrader: (10)

I don't have the wideband hooked up so it's just reading garbage. I gotta mess around with the AEM wideband to get it to read right. During a pull it's usually right around .85 LAMBDA so if IAT's are getting up there it should be nice and rich. Gotta admit it's hard watching it when running though. Mickey does a great job tuning

RedRocketZ28

iTrader: (19)

That's what I figured. It is tough to watch when racing, or even doing a pull on the highway, lol.

Sarg

iTrader: (6)

I don't think I would be too worried about those iats at all. Heck on a 93 degree day here my base temp is 110* after heat soaking for a while. As mentioned, it would be curious to see what boost was before the intercooler though. I am not overly worried about my frozen boost a2w intercooler as it is pretty wide open. I see around a 5-10* rise in temps at the most. Might be something to consider. They can be pieced together cheap.