Yotacool

So this dates back to a couple of months ago. My supercharger was making alot of bearing noise, so i ordered the ceramic bearing rebuild kit from rolling performance, along with a 2.0 pulley from URD. while the s/c was off i got it sandblasted and then i polished it up real nice. still not perfect but, itll get there. i took all the paint off because of the intake temps on, the paint retains the latent heat and doesn't disapate well, my intake temps have dropped over 20 degrees F! with the smaller pulley and ceramic bearings i am making 13psi at 5300 elevation!

Psalm 112

Looks Good!

Yotacool

Then i came across a load of great deals, a brand new TRD cat-back, and a PLX wideband M-300. I already had a APEXi SAF-C II for fuel trim tuning, and the AEM brute force dry filter intake, dynamic tensioner and ground kit. (which is useless, but it was free)

also, my front sway bar broke so i bought a new addco sway bar. it is thick!! handles like a dream now!

mastacox

What are your CDT and EGT temps with that 2.0" pulley? Are you running a W/MI setup?

Yotacool

dont know yet, but ive been running it for several months now,it scoots and runs great! its tuned to 12/1 a/f under full throttle. so i assume my egt's are very near healthy...

what is cdt??

mastacox

Hard to say if that's a safe assumption, but most people with EGT gauges have found that it's safest to keep boost under 10 psi unless you have some way of helping to cool the intake charge (like water methanol injection, since you can't use an intercooler with the TRD supercharger).

Compressor discharge temperature, its the temperature of the air after it is compressed by the supercharger.

Your EGT's are probably too high not because your AFR's are off, but because your CDT is high.

mt_goat

I wouldn't run anything smaller than a 2.2 pulley without water injection. Your elevation is probably what's saving you.

mastacox

He said he's pushing 13psi of boost at 5300ft asl, which tells me he could have already done some slight damage to his valves and/or pistons. Especially if he's pushing that kind of boost on a warm day with no compressor discharge cooling.

Yotacool

the amount of fuel im running which is 91 octane mixed 70/30 with e85 at my elevation is what is saving me. e85 burns cooler and slowly with the 91. at 7psi i could run 85 with no knock. less air, means it needs less fuel, and less boost. the 2.0 pulley at sea level is probably around 15psi.

everything is great. my intake temps are less now than they were with the stock pulley, so...

mt_goat

How are you getting your intake temps?

mastacox

That's a cool idea, i've never thought about running E85...

When you say intake temps, are you actually taking a temperature reading AFTER the supercharger, down in your intake manifold? Or are you just looking at the intake temp on your OBD-II system?

Nevertheless, "intake temps" aren't the problem, its the exhaust gas temp that will burn your pistons. Still, it could be running E85 will keep your EGT's low enough to be safe. Do you have an EGT gauge?

mt_goat

Yeah, that's what I was getting at. I'm pretty sure the OBDII intake temp is actually from the MAF sensor (which of course is before the SCer).

Yotacool

im reading that off the OBD 2 readout from my toyota scanner. and popping the hood a using the laser temp gun.

no i dont have an egt gauge.