SleeperGMC

I installed my AEM meth kit this last week, and went out testing on Saturday night to a local 1000FT. track.
I started out with the 2 smallest nozzles just to be safe and didn't notice a whole lot of change in my IAT's. So I went up to the 2 medium size nozzles, got my AFR to around 11.0 and added 2 deg. of timing and the truck pulls pretty hard now. But IAT's are still pretty high, 148F. What are you guys seeing for IAT numbers running around 10.5psi with Meth?

Vortec350ss

iTrader: (20)

Thats pretty high... but I know its not cold over there either.

This is what a lot of us are butting up against. You need to add a second HEX and a more capably pump. Keep fluid in the IC moving as fast as possible and as cold as possible. Add volume to the HEX to ensure that the fluid moving faster spends enough time in there to cool down. Once that is done your IAT will be significantly better.

SleeperGMC

Yes, it was 98* at 10pm on Saturday night. So not ideal conditions. I guess that's the main problem... I start the run at around 120F then end at 145F. So I guess 25* is not a huge jump, I just expected better cooling with the 50/50 water Meth. Maybe I'm not spraying enough?
Also I already have dual HEX but did not upgrade the pump, might try that next.
Thanks Vortec3500ss

03sierraslt

iTrader: (22)

Run 70/30 meth and water. I hit this hurdle before also. Now at 15psi I see a 16-22 deg climb from 0-120. Maggie needs a bigger intercooler....... the meth really doesn't lower IATS spraying pre compressor but it certainly helps detonation resistance. The water helps pull some of the heat out of the air.

The Bosch pump doesn't like any added resistance in the circuit, I've been opening up the intercooler inlets and outlets recently. I will do the same to mine when the blower is off for the motor swap. The intercooler inlets and outlets are the main system restriction when it comes to flow. Opening them up a bit helps with flow and pressure drop.

SleeperGMC

I notice a huge help in detonation resistance. I'm at 10.5psi and 22* of timing and no knock. Was thinking of adding 2 more degrees but my laptop battery died. I might try that this week.
What's the main reason you run 70/30 meth and water? is it just for the octane or does it cool better? Also, how much are you spraying? I'm at 2 500cc nozzles right now, was thinking of trying 1 1000cc and 1 500cc nozzle and see what that does.

dsmmace

It is possible to have too much methanol injected, it will pool up in the intake and go boom. I know this from my DSM - Eagle Talon days.

There should an online calculator to help you determine a safe volume of methanol to gasoline ratio.

03sierraslt

iTrader: (22)

One important aspect is don't let it spray at low airflow and this won't happen.

03sierraslt

iTrader: (22)

I've ran all kinds of mixes ranging from 50/50 to 100%.
70/30 has always seemed to be what it likes the best. I ran a single 15gph for years and just switched to a dual setup with a 10 and a 7 gph

Fullpower

Try a second pump, spraying straight water right ON front of Heat Exchanger ...
That should bring IAT down closer to ambient.

03sierraslt

iTrader: (22)

Fact of the matter is the faster you spin it the more difficult it is to keep it cool. I noticed once I got below a 3.2 pulley with a OD crank it started to show its face. Mines still good so we will see what it does at 21500 blower rpm.