I know this question prolly belongs in the FI section but nobody seems to answer many prelude related questions there. Here's the deal i have a T25 from a 2nd gen eclipse/talon and all the piping and line required to run it. My question is will the t25 work on my h22a. Someone said it was too small but had no reason why. The eclipse/talon motor it came off of is a 2liter so I don't see the problem. I don't expect major gains with it, i plan on running 5-9psi boost max. Will this turbo work for my application? Thanks in advance for any help

 

it will work well upto about 5000-5500rpm and drop off dramatically.

 

probably end up overspeeding the turbine and blowing the damn thing up.

 

I already said it'll be too small for your application .2 liters is a lot of extra exhaust gas over the 2L mitsu motor, and mitsu designed that turbo to be right in it's efficiency range at like 12psi on that 2L......if you've ever been in a riced out 2G DSM where the person driving it upped the boost on the stock turbo, you'd realize that it just starts blowing hot air at more than 12 lbs.....
If you're going to spend the money for everything else you'll need to do a turbo setup, you may as well get the right turbo for the motor.....eventually you're gonna wanna run a garrett, so may as well get a manifold that'll take a T3 bolt pattern rather than a mitsu housing pattern......just my advice, I understand you want to use the turbo you have, but it's TOO SMALL
Brian

 

t-too small is the common name for that turbo

 

the displacement of the 4g63 and h22a motors are minimal. don't be fooled by the displacement to choose the right specced turbo. it's the air the motor will flow. the t25 has no chance on earth flowing enough air at the higher rpms.

i used to use a t3/t4e with a .63a/r, stage3 wheel 54or 57 trim. forget which. this was on an h22a accord. pulled like mad up top. a bit of lag, but you always compromise when choosing a turbo.

 

not only rpms, but the 10:1 compression ratio wouldn't be good for the turbo either

 

why wouldn't 10:1 be good for turbo, just needs good tuning. im ordering my 10:1 je's for my in the works turbo project.

also man screw what everybody says, if you have the stuff try it. if we all didn't do things that people said wouldnt work, then we would still be driving ford's. JUST MAKE SURE YOU HAVE GOOD FUEL MGMT. so even if that turbo is too small, it will still do something. what i say is make a mainfold to work on your car. or buy one for the turbo that you are going to get and make an adapter for this one. yes a bigger turbo would be optimal, but id get great fuel mgmt. first, then the better turbo...not the other way around, or you will be getting a new engine also. keep the boost low to be safe, and learn something in the process.

any turbo can be made to work on any car. this site will help you a lot! http://www.homemadeturbo.com ....good luck

-Vinny

 

i didn't say 10:1 was bad for turbo...its bad for the T25...

and there's no point to putting it on there, dont tell him to screw what everyone says, this is a turbo which WILL damage your engine if not done right. the turbo, above 6k will just put out massive amount of heat which will just lead to detanation...

if your gonna do it, do it right

 

Even though it's ONLY .2L of difference, remember that 10:1 CR equals more exhaust energy, which means alot more flow than a 8.5:1 CR 4G63...so basically, you'll have QUICK spool up, but no top end whatsoever. And with a turbo that small, you're going to choke the motor. If you're going to use a Mitsu based turbo, try a 16G or 20G on an H22.

 

efficiency goes right out the window and your underhood temps will skyrocket!

 

10:1 compression is fine for turbo with proper tuning, but not for the T25 we're talking about. Different turbos have COMPLETELY different efficiency properties, and "any turbo" will not work on "any car"......

The second statement is just plain dumb. So you're gonna make your own turbo setup, eh? You'd better learn a LOT more before trying that
Brian

 

You guys aren't looking at the whole picture. Sure, we have .2 displacement on the DSM motors, but the real concern here is that our engines are much different than DSM motors. The H22A flows a much larger volume of exhaust gas from its head design. Even if you destroked our H22A to 2.0, the T25 would be too small. Since turbos are exhaust gas driven, and our H22A "breathes and exhales" at greater speed and in volume, you can see that the turbine size is not appropriate. The DSM motor has no ***** without turbo.

 

Then I guess we can just toss all of these turbo compressor maps and just start slapping turbo's on different motors to see if it "works".

And look at how many cars they've blown up...

My point is that there's more to it than just slapping on turbos, dump a load of fuel on it, and hope it'll stay together. From an engineering standpoint, the t25 is totally undersized for the H22. The 4G63 makes 210hp on the t25, at 8.5:1 CR.

Now the H22 already makes 190-200hp, in N/A form. The exhaust housing on the t25 is small. As you get going, the boosted motor now is pumping out alot more exhaust...which leads us back to our argument. The additional exaust flow will be restricted by the t25's exhaust side, therefore the heated exhaust gets backed into the combustion chambers and help induce detonation which will kill the motor. There's a REASON for different turbo sizes, it's not "one size fits all".

 

please take some advice from someone and people who have done an h22a turbo. the t25 will be awesome from about 1500-5000/5500 rpm's. the power will be good especially in the area of 3000-4500rpm.

however, after that it's done with.

an h22a running a t25 at 7000rpm's on the highway will get eatin alive by an all-motor h22a. owned.

do it right the first time. you also will have a problem finding a manifold to fit a mitsu. turbine housing.

 

Thanx for all the advice. I got the hint after about post #2 But I just figured I'd ask sisnce everything was availible for free including the manifold. So my next question would be what would be a good turbo to go with? Preferablly something I can pick up for a reasonably cheap. I don't want garbage I've learn't my lesson about getting what you pay for along time ago, but I want something that will work good and won't cost an arm and a leg. This is for a 94 JDM h22a in a civic btw.

 

A pretty typical turbo on the H22's is a T3/T04e .57 trim stage 3 wheel .63 a/r.......it's out of it's efficiency range a little for anything under 10psi, but not that bad.....this is the turbo I was going to run before switching to a GT series....
Brian

 

Any suggestions on where I could pick up a t3/t04e for a decent price?

 

Agreed, and to give you an idea of how a T-25 would perform on an H22 do this.

-take both hands and put them around your throat
-SQUEEZE as hard as you can (even if it hurts)
-suck air in and blow it out as fast as you can with your lips pursed together with only a small opening for the air to pass through
-let us know how long it takes till you pass out




[Modified by BlueShadow, 4:17 AM 9/13/2002]

 

wouldn't it be better to it right the first time?
T25 is not good for H22A. T3 is a much better choice. i'd personally go for a T3/T04. there is a big difference between a 4G63 and H22A. H22A has higher compression and more displacement and therefore needs a bigger turbo.
you gotta keep in mind that T25 was designed for low compression 2.0L and that's to run minimal boost. so basically you'd be throwing money away as you wouldn't see any big performance improvement.
T25 on an H22 will spool fast but the top end would suffer.


[Modified by BB1, 10:16 AM 9/13/2002]