considering a supercharger

[m90daytona]

Quote:

Originally Posted by Ondonti I just would think if you are going to all that trouble then you would put some thought into your supercharger. They have compressor maps just like a turbo. How would the m112 compare to the m90, etc.

if its good enough for harvii its good enough for me!

[Ondonti]

I think the point is that 87turbodance wants to go to an insane amount of trouble to do a headswap but just slap a m90 on there.

Ive seen the M90 efficiency maps before and I would think its important to make sure you are going to stay in there.

You want to be in the 50% efficiency island of the m90.

Edit: I havent seen m90 maps before, just "other" roots blower efficiency maps. I dont know if the maps are available for the mseries.

[m90daytona]

the efficiency is okay on a stock m90 but if you port them and have the compressor blades done it goes way up.

[Shadow24V]

heres a link to the compressor maps (i think) on eatons website, has both the M90 and the M112.
http://www.automotive.eaton.com/prod...rgers/M112.asp

and this efficiency map on wikipedia
http://en.wikipedia.org/wiki/Image:R...ciency_map.jpg

[87turbodance]

Quote:

Originally Posted by Ondonti I think the point is that 87turbodance wants to go to an insane amount of trouble to do a headswap but just slap a m90 on there. Ive seen the M90 efficiency maps before and I would think its important to make sure you are going to stay in there. You want to be in the 50% efficiency island of the m90. Edit: I havent seen m90 maps before, just "other" roots blower efficiency maps. I dont know if the maps are available for the mseries.

I would like to do the head swap so that it is done. An M90 will be a stepping stone. I wouldn't be asking for anymore than 12psi from the M90. I think it should plenty enough air for 300WHP. The next step after the Eaton would be a turbo. I think there would be plenty of fun to be had with the M90.

The reason for the complicated head swap is to get a better starting base. I also like the broader powerband of the multivalve heads. Better for the street. I'm sure there is tons of power to be had from 12V heads it's just that right out of the startig gate you're limited by the head efficiency. I believe it is far easier to make power with 4 valves than 2. Two valves can make just as much power but you sacrifice driveability.

[Travis_k]

If you run an m90, try to run an intercooler, becasue they get extremly hot. I have one on a 99 pontiac gtp, and it gets quite hot very quickly. lol

[87turbodance]

I'd probably just end up running water injection instead of an intercooler

[Ondonti]

Quote:

Originally Posted by Shadow24V heres a link to the compressor maps (i think) on eatons website, has both the M90 and the M112. http://www.automotive.eaton.com/prod...rgers/M112.asp and this efficiency map on wikipedia http://en.wikipedia.org/wiki/Image:R...ciency_map.jpg

The first ones I consider worthless for choosing the right supercharger.

The second one is the one you want but I dont know how you find them
Ive got one of those real efficiency maps in my books.

[joker5k1]

http://www.rbracing-rsr.com/turbotech.html

These maps seem to be fairly accurate. I hope this helps.

-Joe

[Ondonti]

those are not roots blower efficiency maps.

Im guessing Eaton doesnt release them. I really hate when turbo/super companies do not release the maps.

[m90daytona]

the guy i bought my m90 off of said it pushed 25psi out on a 3.8L intercooled thunderbird. i figure if it will push out that much on a 3.8L it will do at least that on a 3.0. granted the intercooler was smaller on the t-bird and less piping also; i still figure if i put the stock crank pulley on (which i wont untill i build the motor) i can achieve somewhere between 21-25 psi. the efficiency has also been increased from the work that was done on it so i think this will be pretty intresing to see what kind of power i make when its done.

[Ondonti]

psi doesnt mean anything.


Put a stock exhaust on, stock everything, and you will get more "psi" and less power.

[mwinkle353]

Quote:

Originally Posted by m90daytona the guy i bought my m90 off of said it pushed 25psi out on a 3.8L intercooled thunderbird. i figure if it will push out that much on a 3.8L it will do at least that on a 3.0. granted the intercooler was smaller on the t-bird and less piping also; i still figure if i put the stock crank pulley on (which i wont untill i build the motor) i can achieve somewhere between 21-25 psi. the efficiency has also been increased from the work that was done on it so i think this will be pretty intresing to see what kind of power i make when its done.

Now, don't quote me on this. But I think SixpackDan put an M-90 on his daytona. And he reported that with the stock pulley on both the supercharger and the crank, he was making 13psi of boost.

[m90daytona]

Quote:

Originally Posted by mwinkle353 Now, don't quote me on this. But I think SixpackDan put an M-90 on his daytona. And he reported that with the stock pulley on both the supercharger and the crank, he was making 13psi of boost.

yeah that sounds right but i meant a stock crank pulley and the smallest sc puylley they make for the m90. sorry for the misunderstanding.

and i know psi doesnt mean anything but i doubt the guy who had this t-bird had a stock airbox and exhaust.

[Ntrain2k]

I would suggest you start off with the stock SC pulley and an UD crank pulley. Tune and work your way up from there.

Lots of fresh motors have been broken from running hella boost from the start.