please spend a few moments with this...



7722 RPM, 26.3 psi at 2493 elevation, EFR 9180 around 550 rwhp, 37% Ethanol

416.3 F out of turbo compressor before the IC.
169.5 F at the OE IAT location
105 F ambient (ambient is AT the airfilter, not outside temp)

calculate IC efficiency:

416.3 - 169.5 / 416.3 - 105 = 79.2 Efficiency

my IC is rated by Spearco at 67% efficiency. which is pretty good.

79.2% - 67% = 12.2% from the AI (about 1200 CC of 100% meth)

416.3 F - 105 = 311.3 X .122 = 38 F

the addition of meth to the charge air lowered IAT 38 F

if the temp numbers seem high to you welcome to the real world of accurately measuring temperatures. both the temp out of the comp and into the motor were measured by thermocouples... similar to EGT thermocouples. unlike thermistors thermocouples sample at FOUR samples per second and are accurate +/- .4%. in other words at 200 F plus or minus EIGHT TENTHS OF ONE DEGREE.

here's a link to one of the two vendors i use for IAT thermocouples:

Air Intake Temperature Probe Thermocouple Blower, Supercharger

i also use EGT Technologies and especially like their thermocouple amps.

back to the picture as you now have the numbers...

note the exploding charge air temps out of the turbo with RPM.... note, initially, the similar IAT rise. now note the emergence of meth as represented by the green AI pressure line.

finally, note the flattened IATs with AI.

what might IATs have been at 7722 without the meth??

one caveat here.... this run was at 2493 feet of elevation so the turbo had to work a bit harder to make the 26.3 psi. 8% harder. (increasing the compressor output temp)

around 550 rwhp. offsetting the elevation are two more factors ultimately effecting IAT.... the run stopped around 7700 as did the straight road and it was only at 26 psi. 30 is more fun and also more F.

 

How are your operating temperatures so low? Or was the car not fully warmed up?

 

like most, i used to see 87 C coolant with my Koyo radiator and dual OE oil coolers.

i made a few changes:

153 F Mishimoto thermostat
FFE idler pulley
Rick Engman waterpump (has an impeller that looks like a turbo compressor)

result: 67 C almost all of the time. yes i know you can make max power around 195 F but of course things warm a bit if you are on the gas for an extended time... otherwise i will take cool.

oil temp... nothing super trick, i just run two Mazda oil coolers and wasn't warmed up.

 

50% injector duty at 26psi on a 9180. Is that a result of the meth or are your injectors just that big?

 

i was running six 1350 CC injectors total 8100 and 1200 CC of meth

my newer setup replaces the 4 secondary injectors w 1700s. i now have a G40-1150.

 

Are those water pumps a straight fit?

Be mindful your thermocouple unit is still very likely relying on a thermistor for junction temperature and there are all sorts of effects impacting accuracy and repeatability of thermocouples, they do get memory above a certain temperature and changes in insertion depth can then bias readings amongst many other things.

 

the Rick Engman water pump is a new Mazda water pump assembly with his impeller. Mazmart may still have them...