i only push 17.5 and i have a stage 2 kit with a 2.9 pully and i have a 2.5 magnaflow catback and a fujita 3'' CAI

 

I see what your saying.

but your not disagreeing that superheated boost is bad....
your saying that there are ways to avoid making that superheated boost and still make good power off the m62

that i completely agree with.

 

ding ding ding!

give em a cookie!

or a beer. either one, or both

 

cookies and beer, yum! lol

 

ill dip my cookie in mah beer!

 

honest bro, when i had the meth in the car, after hard hard pulls i could touch my s/c without it being too warm that it burnt or anything, it greatly decreased temps and kept the s/c in efficiency

 

i hear ya.
its the reason im expecting a shipment from AIS in the next day or two


living in alberta really helps dealing with temps too.

at least theres ONE good thing about this frozen tundra hah

 

What you really have to address is:

If I spin my blower at X rpms, what is the heat efficiency.

If Y is the blowers ability to disipate heat, then once you exceed the heat efficiency you will start to rapidly gain heat. Let's say that the blower can operate at 12.5psi producing only enough boost as it can handle the heat from.

So if 12.5psi = max X, then 12.5*X=Y anything above that creates excessive heat that will continue to BUILD since you are adding faster than it can subtract.

Let's go to 15psi Now you are talking about 15.0*X=Y+2.5 (per second) so do a 14 second pass at the track and now you will have 15.0*X=Y+35.

The question is at what heatsoak will your car blow the piston ringland into your oilpan. That number will vary with each car.

Then you take the people like Blown4Banger who races at 19.5 psi for about 20 seconds.

We are looking at 19.5*X=Y+140

That is 4 TIMES as much heat stress as a 14 second track run with stage 2.

Now there are obviously other variables that don't need to be addressed per say (like starting cylinder temps if not properly cooled between runs)

 

makes ALOT of sense.
people often question why i go park my car after 3 runs and get something to eat

I dont like starting a 1/4 mile run unless my IAT2 is below 90*

 

Well it's actually better to let the car run for about 3 minutes. You want to let the coolant circulate to bring down the temps of the cylinders and head. Parking it right away will just trap all of the heat where you don't want it. Same kind of philosophy as a Turbo Timer.

 

yup. same with the equipment i run at work.

but it usually takes me a few minutes to putt over to the parking area anyway, which is plenty enough to settle down the temps.

I train people how to drive 4000hp haul trucks for a living, one of the first things i tell them is to NEVER shut off a hot engine

 

wrong, wrong wrong.

god there is so much ****-poor information in this thread, yet again.

at least Steve finally laid out the math behind IAT's and Bryan is handing out cookies again.

boost has absolutely jack **** with why the motor pops, its not AIT related eaither. this i know, this is what i do.

if 20psi is the limit as you say, please dear god exsplane why i can run well over 20psi on a unit that moves multiple times the air volume of the m62 and have a perfectly fine engine?

+1 on that.

head temps get crazy after a few pulls, just look at egt's!!!!!

 

everybody digs cookies

 

im thinking pre-blower meth with post blower n20, will be as cold as it gets. should make decent powa with moderate timing. and i have a 2.8 and 60's. need to get my dual pass in dammit.

 

Shaddup

 

wow... i read all of this post and came up with nothing....
I'm thinking about getting a 2.99 or a 2.95 pulley on the GM stage 3 ECM. I heard the stage 3 runs alot leaner then the stage 2 so I'm not sure which pulley to get. But instead of doing alot of cooling mods like meth and dual pass would just a heat exchanger be alright?? And is there much of a difference between a 2.99 and a 2.95 or even a 2.9 pulley? Which would be better and but also safe? I think the stage 3 pulley is 2.99 and i think i should stay with that.