Meth not lowering IAT

[robvas]

Car is a 1997 Cobra with a Paxton Novi 2k @ 15lbs

Ther is an AIS meth injection kit, trunk mounted tank and pump, full of boost juice. VC-25 controller, one nozzle in the power pipe and one in the intake pipe before the TB. Draw through BA2600 ( or something MAF in the fender well. No intercooler.

Not sure where the IAT sensor is. Is it common to put them in the intake manifold on 96-98 cars?

Anyway here's my problem. Logging with an SCT X4, My IAT's go up to 200 degrees under boost. Cruising is 130-140

Previous owner only drove it a few times and knew nothing about cars. I made sure the meth pump worked when by hearing it come on when I jumped the harness by the controller.

I also verified the meth comes out under boost, unhooked the line going to the nozzle in the power pipe, wrapped a rag on it and went wot. It was wet afterwards. Controller is set to come on at 7 psi.

Shouldn't my IAT's be like 80-100 degrees lower? Never goes under 130 and on the throttle it goes 160-200.

The only thing I can think of is the nozzles are clogged and it's not actually spraying? My next step is to remove the nozzles from the intake pipes and jumper the pump to see if they generate a mist, right?

Anything else I'm missing or not thinking about?

 

[DSG2003Mach1]

I’d say need to verify where the iat sensor is. I’m not familiar with those years. If it’s before the meth nozzle you’re just chasing your tail

 

[cobracide]

Stock IAT location is in front of the throttle body. It's possible that the Meth does not have enough time to completely ionize before it hits the IAT.

 

[decipha]

IAT is usually in the inlet they may even be using the maf iat

best bet is to have it spray before the blower and put the iat in the outlet pipe before the tb

while spraying the temp should drop to near ambient by the end of a full pull otherwise you need more spray

 

[cobracide]

If the MAF is 7 pin, the IAT is with the MAF.

 

[robvas]

IAT is usually in the inlet they may even be using the maf iat

best bet is to have it spray before the blower and put the iat in the outlet pipe before the tb

while spraying the temp should drop to near ambient by the end of a full pull otherwise you need more spray

There are two: Nozzle before the blower and before the TB

If the MAF is 7 pin, the IAT is with the MAF.

If it's still in the MAF the temp shouldn't really change much right?

 

[robvas]

Welp, took the nozzle out of the power pipe and it's gunked up really good with residue.

The charge pipe nozzle was pretty clean, though. I'll clean them both out and put it back together and see how it goes. Hopefully that's the fix.

 

[Blkkbgt]

Welp, took the nozzle out of the power pipe and it's gunked up really good with residue.

The charge pipe nozzle was pretty clean, though. I'll clean them both out and put it back together and see how it goes. Hopefully that's the fix.

What brand methanol were you running?

 

[robvas]

What brand methanol were you running?

There is the Snow boost juice in it right now. In the past I would assume the same stuff. Previous owner gave me the couple bottles he had.

That residue looks purple not red so maybe at some point the purple washer fluid was used? Then again maybe that's what the boost juice looks like when concentrated or whatever

 

[Blkkbgt]

There is the Snow boost juice in it right now. In the past I would assume the same stuff. Previous owner gave me the couple bottles he had.

That residue looks purple not red so maybe at some point the purple washer fluid was used? Then again maybe that's what the boost juice looks like when concentrated or whatever

I kind of figured it was snow boost juice based on the color. Every time I've come across a post about clogged nozzles it always seems to be boost juice. I don't know if it's the dye they use or if it's just the formulation.

Funny thing is I don't think I've heard of anyone having an issue when they mix their own.

 

[robvas]

FWIW even though the other nozzle looked clean, it only streamed water out when I tested it. I cleaned both and they both mist. Re-installed them and I'll test it later. Fingers crossed.

 

[omj]

Meth was such a pain for me that I switched to a giant air to air intercooler and haven't looked back. Now, I see about 20* higher than ambient max when I am running wide open.

 

[robvas]

Going to have to positively locate the IAT. Put the clean nozzles back in and no change in temps.

 

[slow306stang]

What size nozzles are you running on the meth kit?

 

[robvas]

What size nozzles are you running on the meth kit?

A17 in front of the blower and A14 just before the throttle body (gph)

Need to get out in the garage still to find where the damn IAT sensor is.

 

[robvas]

Confirmed that both nozzles are spraying.

Also confirmed that the IAT is not coming from the SCT MAF in the fender (unhooked it and it still showed ambient temp)

Has to be in the intake manifold or TB....but why isn't it seeing a cooldown?

 

[robvas]

Seems like 150 degrees causes all my timing to go away which makes sense. No cooling going on. Just don't get how this car was tuned etc. Someone moved some shit around at some point. I'm tempted to just go buy a Lightning IAT and stick it in the intake pipe before the TB.

 

[Blkkbgt]

I would find the IAT sensor before doing anything else. Start at the MAF sensor electrical connector and work backwards along that harness. You should find a breakout lead for the IAT sensor, it's only two wires FYI.

It may be installed in a terrible spot or maybe it fell out. This could happen if it's the push in style under boost.

Also look in the end of the air filter. My old AEM intake had a spot for it in the end of the filter and was there for older model cars where the IAT wasn't part of the MAF.

I also specifically remember my old vortech instructions called for it to be placed in the intake before the blower.

 

[robvas]

I would find the IAT sensor before doing anything else. Start at the MAF sensor electrical connector and work backwards along that harness. You should find a breakout lead for the IAT sensor, it's only two wires FYI.

It may be installed in a terrible spot or maybe it fell out. This could happen if it's the push in style under boost.

Also look in the end of the air filter. My old AEM intake had a spot for it in the end of the filter and was there for older model cars where the IAT wasn't part of the MAF.

I also specifically remember my old vortech instructions called for it to be placed in the intake before the blower.

Found it. It's going into that couple just past the turbo. Before the nozzle in the charge pipe.

So I will move it up closer to the TB. I guess spraying into the supercharger doesn't do a whole lot for temps.

 

[01yellercobra]

I'd still suggest switching to the lightning sensor. That's how my 01 was set up. Never worried about the sensor pushing out or having a leak.