Would a pair of mitsu's perform on a 3.0??

[DaytonaTurbo87]

I've just been wondering, would a pair of mitsu turbos off of a 2.5 T1 perform decently at all on a 3.0 twin turbo setup? I know for one 2.5L engine they're small, but if each is only handling 1/2 of a 3.0, so 1.5L on 3 cylinders, then all of the sudden both of them would seem kinda big. Would that take too high of rpm's to spool decently though?

[roguetrip]

I've been wondering the same thing, i think they might not spool in the right rpm range (maybe 3500?) if running as a pair. But would be a better setup than a pair a of 9b's that came stock on the 3000GT VR-4's

[m90daytona]

Quote:

Originally Posted by DaytonaTurbo87 I've just been wondering, would a pair of mitsu turbos off of a 2.5 T1 perform decently at all on a 3.0 twin turbo setup? I know for one 2.5L engine they're small, but if each is only handling 1/2 of a 3.0, so 1.5L on 3 cylinders, then all of the sudden both of them would seem kinda big. Would that take too high of rpm's to spool decently though?

i personally prefer 1 big turbo but those mitsu turbos should work nicely. 1 for each bank.

[Harvii]

Why not use a pair of 13B's from the 1st gen auto DSM cars or a pair of take offs from a Stealth/3000GT TT? Probably easier/cheeper to get and has more upgrade options than the Mitchu that came on the TD cars. When you get running with the inital setup you'll want to start upgrading and you could easily find a set of 14Bs for cheep as well.

Price of a mitchu used mitchu 13-14b = dirt
price of a TD used mitchu and upgrades = $$$$$$

Hell if you could do a single turbo setup a $500(new) Mitchu Evo III Big 16G would do you real well. Good luck finding a similar TD turbo for under $1000. Damn dodge and their funky turdbo bolt patern.

[mwinkle353]

I think two mitsubishi's would be a decent match for the 3.0L motor. They have 12c compressors. The turbine housings are tiny enough to allow decent spooling (they spool a 2.5 at damn near idle). As a matter of fact, if I didn't find that my IHI's were just about perfect for the 3.0L, I was thinking about using the TE04H for my setup.

I say go for it. If you don't like the setup, then just get a pair of garretts for the motor.

[Ondonti]

3000gt guys are actually using Twin Evo III big 16g's. One evoIII 16g is NOT a big turbo for the 3.0 (even if it has the "big" 16g wheel ).

[mwinkle353]

True. But those guys are also spinning up to 8000 rpms.

The stock TD04-9B turbos from them would be a decent choice for our motors. As long as you don't go above 15 psi and stay with the stock redline. They flow about 260cfm. The 13G flows another 100cfm above the 9B's. They would put the highest effeciency island right about 5000 rpms on our motors. The TE04H have 12C compressors in them. This would be a decent compressor for a stock 3.0L. They would be just off the right side of the max effeciency island on our motors and have quite remarkable spooling properties due to the smallish turbine housings.

My turbos flow about 300cfm and put the peak effeciency island between 3500-5000 rpms anywhere between 6-10 psi. I'd compair these to the 12C mitsy compressors.


Keep in mind, Brent, not all of us are building a monster motor like you are.

[Ondonti]

the 9b's are okay except that on the dohc motors, they run out of breath pass 6000 rpms and boost drops.

I think the mitsu chrysler turbo is a better match then the 9b.

[mwinkle353]

Here's the compressor map for the TE04H turbo.



To find CFM, multiply the M^3/S by 60. Then multiply by 35.3144. That will give you ft^3/M


I say it's a decent choice as long as you keep it under 21 psi. By my calculations, the motor won't use but half of it's flow capapability in stock form. Now, if you were to use these on a motor that has much higher volumetric effeciencies in the upper rpm ranges, it would be an awesome turbo to use as a twin setup.

I have to make an error correction. I stated above that the TE04H would flow the same as my IHI's. I was wrong. They flow about the same as the IHI's that come on Ford Thunderbirds in 87-88.

[DaytonaTurbo87]

okay, sounds cool, I'll definately be keeping those in mind for a possible future 3.0 tt setup. I just like the price they can be had for, $60 per turbo from the local junkyard and $80 or so per rebuild kit. Can someone go thru with me how to calculate the info needed to check on a compressor graph? I had the formulas and stuff all nicely laid out on a text file but I can't seem to find it on my computer, lol.

[mwinkle353]

best way is to get a dynograph of the motor. I just used Rob C's 88 minivan's baseline dyno for my numbers. Once you find out how much hp the motor makes at each rpm level ( I used every 500rpm) then you can calculate the motor's volumetric effeciency (VE) for that rpm. After that, it's very simple mathmatics. Take your motors total volume per revolution, multiply it by the rpms, then multiply it by the respective VE%. This will give you your motor's flow requirements at WOT. Then take the same cfm's and multiply by 2. These set of numbers will be the motor's flow at 2 bar (14.7 psi) boost. Run a line between the 0psi and 14.7 psi points and you have the motor's cfm usage for all pressure levels of that rpm. Do this for all rpm levels, then you'll basically know if the compressor is worth using on your motor or not.


Keep in mind, this does not take into account for heat built by pressurizing the intake air. this is only a rough estimate as to the required flow used by the motor.