I have come to a problem with this build. I am gonna be using a meth injection kit and I am using a Holset H1c so I think I have to upgrade from the 2g maf.

Now, should I go with a gm maf and risk it getting messed up from the meth, or should I go with speed density and have my AIT sensor get messed up from the meth/different readings?

Any good solutions?

If you are wondering about both, the speed density setup is superior to a MAF system. You aren't going to mess up the IAT and you have 2 mounting options, pre or post nozzle. Post nozzle will give you the accurate air temp going into the motor while pre nozzle will keep it from getting wet.

Most people opt for post nozzle in the TB elbow.

Alright thanks, and you sure I won't mess up the air sensor going post?

Aproductions said:

Now, should I go with a gm maf and risk it getting messed up from the meth...

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The meth injection should be several inches after the GM MAF in the UICP, so it won't be an issue...unless you plan on injecting pre-compressor for intake charge cooling, which is a whole other animal.

But personally, I'd go with SD (and did as a matter of fact

You won't mess up an IAT sensor. And if you do (for some reason), they're very cheap to replace.

Speed Density > GM MAF.

I've never heard of meth ruining an IAT sensor.

Thanks guys, BTW Calan, I emailed you to let you know I got the catch can and it is awesome! thanks again.

calan said:

The meth injection should be several inches after the GM MAF in the UICP, so it won't be an issue...unless you plan on injecting pre-compressor for intake charge cooling, which is a whole other animal.

But personally, I'd go with SD (and did as a matter of fact

Click to expand...

Meth can get into the MAF if the pipes are going downhill. I have 2 nozzles (about 1000cc combined, and 6-10" after the MAF) and the residual meth runs down the pipe into the MAF and the car runs like crap for 15 min after a meth pull. Even with solenoids to avoid drips i'm still having the problem. The only cure will be redesigning the pipes so the meth cannot back flow into the MAF.

SD is absolutely the way to go.

Your not going to run into issues with messing up a maff as long as you don't inject to much nozzle size.
You want to inject enough that it removes the heat out of the air. Many people especial in the dsm world like to use methanol injection kits as a 2ndary fuel system and replace fuel with methanol. I don't like to see a 14gph nozzle on anything making less than 500hp.