Z06-Dave

A few weeks ago I noticed that my IAT's were in the high 130's after my passes. I have meth and was told that is too high. My pump was leaking so I bought a new one, I figured that was the issue, but I'm no longer sure. It all seems to be working from the LED that turns briefly red then green, but my temps last night went over 140 after one pass, so I was done for the night.

Today, I took the nozzle out of the intake and pressurized the vacuum line, let the car idle, and meth squirted all over, so I know its working. I tried this a varying amount of pressure (boost) and as it should, the higher the pressure, the more harder the meth squirts.

Why would the meth work now,but not while driving? When idleing if I press the TEST button the car stumbles, so I know it squirts when parked.

Anything else to check? I'm stumped....

madmax4499

iTrader: (3)

so your saying your IAT is higher than normal while spraying? what was it before? sounds like it is working but your IAT sensor may be going out. "reporting the wrong temp" im sure there is a chart to check the ohms vs. temp. or just put a new one in and try it. im assuming the meth is sprayed before the sensor? or a bad batch of meth? do you mix or 100%?

are you logging? you should see a drastic temp drop with the meth on then slowly go back up to normal when it is off.

Z06-Dave

The sensor is directly next to the nozzle, in fact they touch each other, and the meth nozzle is before the sensor. Before I went to the track I logged some 'sprited' driving, and there was a drastic drop in temps, but I could not get too much into boost on the test. So I think the sensor is working ok. I only ever use 100% meth and it can't be a bad batch, I get it directly from the distributor out of the truck. I was also shocked by the amount of methanol that the nozzle squirts, I had no idea so much went through the motor!

Fbodyjunkie06

iTrader: (10)

If it stumbles at idle when your purging it then it works, I dunno I'm stumped.

71 chevy

iTrader: (18)

how much boost. 140degree intake temp is GOOD . at 8.5 psi my iats with no intercooler on injection were 230 degrees

with water only in the injection kit, at 15psi its only 155 degrees. with ice in the water, it was 124 degrees

Fbodyjunkie06

iTrader: (10)

Woah there, I don't know if I would call 140 good its not terrible, but not optimal by far. You really don't want to be over ambient by much.

The Alchemist

iTrader: (19)

Almost every one I've talked to says methanol actually lowers their IAT's to where it's lower than ambient.

Fbodyjunkie06

iTrader: (10)

Thus the reason why being over ambient is not good If those were IAT's without meth I'd say it'd be expected with a s/c set-up without running meth.

Z06-Dave

I was told it should be in the 80's...

MUSTANGBRKR02

iTrader: (91)

If it's tuned for the meth then you should see it go lean on your wideband if it isn't working properly.

boosted LT1

iTrader: (3)

It seems temps will vary...mine tends to be ~ambient when I have meth on and running ~15 psi

Fill the tank and see how much you 'shoot' in a pass. I have a hob switch and an RPM and I wasn't shooting enough. So I lowered start rpm and then it was fine again I had forgotten I was experimenting with short shifting.

I now shoot meth >~5 psi and >5400 rpm.

Good luck

Fbodyjunkie06

iTrader: (10)

S/C IATs will be higher than turbo set-ups with twin screws and roots having more heat soak than a centrifugal. My IAT's I was told were in the low 80's.

SirNemesis

I think you will want to have your meth nozzle and IAT spaced apart a little bit. If they are directly opposite your IAT won't get a chance to see the cooling of the air.

You should have your meth nozzle at least 3 inches before the IAT to actually see the cooling effect.

jjcamaro02

iTrader: (34)

The same thing happened to me I move the nozzle further away from the iat sensor and temps dropped from 135 in to the 70 to 80 degree.

Z06-Dave

I was wondering if that was possible. The nozzle butts up against the IAT sensor and the meth probably shoots over it, at least half of the spray shoots past the sensor. Also, it seems to work at lower boost levels, maybe because the meth doesnt get sucked past the sensor as quickly???

I don't know, I may be grasping at straws here...

71 chevy

iTrader: (18)

ambient is over 100degrees this time of year in dallas, so gaining only 24-55 degrees at 15psi is great to me. it would be over 250degrees without water injection

MillsMotorvation

Yeah put the temp gauge upstream of the spray nozzel, you should see a difference.

SirNemesis

The spray itself doesn't immediately cause cooling. It is the rapid evaporation the cools the air around it, so you should have a little gap so your IAT gets a chance to see the difference.

This is how I run mine.