turbotuner20v

Now that its in the mid 90's during the day I have seen some pretty high intake air temps at wot, ~170° in some cases. I'm not sure if my tuner disabled the iat timing adjustment, so just wanted to get an idea on when to start being concerned.

03LQ9

I'm wondering this myself... I don't run an intercooler and have seen intake temps 200+ running 8psi. I set the iat table to drop timing at higher temps but the performance is way down.

Blackpanther99

iTrader: (8)

You should talk to your tuner and let him check it out.

Wicked69

I saw 200's. No big deal on the street and the 1/8th but car blew up in the 1/4 with it that high.

hellbents10

iTrader: (10)

I depends on the fueling and timing when its that high. I have run 255+ and maxed the IAT sensor many times on E85 and 10-11:1 compression engines.

CameronVic

iTrader: (5)

What I learned (the hard way) is that you're probably talking about a forged longblock, whereas the OP is talking about stock pistons.

Having said that, the hottest I've ever gone and not hurt anything with my setup was 195* at the 1/4 traps. That was spraying 50/50 water and denatured alcohol (basically ethanol) and I'm non intercooled E85 efi.

I am going to keep the setting in my MS3X on to pull timing beyond 200* because if it gets that high, it means my meth pump isn't on. I'm also going to spray straight methanol this time around.

turbotuner20v

I have a built iron block w/ forged rods/pistons ~10:1 compression. I'm running 20psi on an F1a making ~915whp. Max timing is ~16* I think. The car is running ~10.7:1 a/f... basically E70 on the E85 fuel tune, but it's pretty decent.

hellbents10

iTrader: (10)

No I am talking junk yard engines here. You need to keep them fat with high IATs just like when tuning a non-ic methanol engine.

skinnies

iTrader: (33)

I've seen you post this a few times, what do you consider fat with high iats.

94 slow

I assume you are not running a intercooler...

hellbents10

iTrader: (10)

9.5-10:1 of it will light OK. I run mine pretty lean at 19psi with 220+temps, 10.5-11:1. I run 21*adv down to 17* when the IAT is on its way up.

turbotuner20v

I'm running the standard procharger intercooler for a C6 vette kit. It's 96* ambient w/ unknown street surface temps at ~1pm at the top of a 4th gear pull ~150mph+

a4ls2goat

I dont understand how you guys can run it that rich.

My motor hates anything richer than 11.5.
Granted my setup is on a intercooler. And 18* . 4.8

CameronVic

iTrader: (5)

Good to know. I'm gonna target 10.0 AFs and see if it coughs! Thanks man!

CameronVic

iTrader: (5)

I'm gonna guess it has everything to do with crazy IATs. Every setup is completely different. I've learned that you can have everything identical on two engines side by side, except one has like 2 more * of overlap in the cam, and that alone could require massive differences in the tune. I think people on LS1tech that spread urban legends forget that sometimes.

skinnies

iTrader: (33)

Exactly what I was expecting to hear from you, people should really read this post.

CameronVic

iTrader: (5)

What should they read from it? That he's got a whole gang of time in his motor? It's all about what the setup wants. I went 10.76 @ 131 with 16psi and 13*. That's what the car liked threw a degree at it and it sounded like rocks in a spagetios can. That was all at 190-195* iats.

skinnies

iTrader: (33)

If you are going to run e85 and high iats, you NEED FUEL to cool it down, meaning tune it RICH.

CameronVic

iTrader: (5)

Gotcha! 10.0 it is!

sc5952

Not to jack thread but what should max iat's be on 91 octane? I am transforming this car I bought and changing to a2w and putting meth injection on it. It had e85 but I don't have anywhere to get that close.