[ponykillerprobe]

the custom fab kit my friend is doing for me uses a T3 turbo, is that too big for the KL motor to spool, ive seen threads about the mitsu turbo's but those turbo's suck for top end, so would a T3 be a good balance for top end and low end?

thx
joel

 

[mm2587]

thats definatly not too big, some people will say a t25 is right for our engines, but personally i would go with a t3/t4. I a t3 would work well, do you have any more details? A/R raitio, compresser, turbine size?
btw, are it a FORD probe gt or a MAZDA mx-6 that ur drivin?

 

[mm2587]

wait hold on, are you driving a 1st gen turbo (gt) mx6/probe (1992 or back) or a 2nd gen (1993-1997) n/a car. if you have a first gen you dont even have a kl series engine. unless you swapped?????? from ur mod list it sounds like u have 1st gen, in which case your in the tottally wrong forum and dont kno what kind of engine is ur car......... if you do have 2nd gen u either have 2 sixes and r trying to confuse me or u have typo in your profile

 

[ponykillerprobe]

my bad bro...................

i have a 1st gen PGT, but i just sold it and i am buying a 93 MX6 LS.

 

[Mici]

I'm using a straight T4. :shrug: It's all depending what you want. If you ask me, there is a lot less stress on engine with T4 than my previous, a lot smaller turbo, and the engine behaves better. It might lose some on traffic lights (if you are into racing lights, I'm not), but in the end, the small turbo didn't produce power above 5500 or so, where the big one really kicks at.

T3 is definately not too big.

Mici

 

[DrBrown]

Anything less than a t3 super 60 and you most likely wont be satisfied as you will have tons of low end torque and absolutely no top end power. Its like driving a car with the ZE engine but it gets a 50 shot of nitrous right off the line. So traction sucks and it has no top end pull on the freeway. They are only good on higher boost like 7-8 psi and above on the V6 2.5. But they are far from being too big! T3/T3 is most likely to make you happy in the long run,

dan

 

[Goatcrapp]

I'm using a straight T4. :shrug: It's all depending what you want. If you ask me, there is a lot less stress on engine with T4 than my previous, a lot smaller turbo, and the engine behaves better. It might lose some on traffic lights (if you are into racing lights, I'm not), but in the end, the small turbo didn't produce power above 5500 or so, where the big one really kicks at.

T3 is definately not too big.

Mici

definitely not too big.

on that note, im experimenting with a smaller t25, but the a/r is literally double what it is on a stock dsm's t25... im HOPING that will let it hold boost well into the rpms, to address the issue mici was having with his smaller turbo.

but we'll see.

if not, i upgrade. no biggie ;p

 

[LARKEN]

Are you guys saying that a T3 can't produce any boost pressure above 5500 rpm on a 2.5L engine? The problem may be the turbo is too far from the exhaust, and efficency is lost because of heat loss.

 

[Mici]

Are you guys saying that a T3 can't produce any boost pressure above 5500 rpm on a 2.5L engine? The problem may be the turbo is too far from the exhaust, and efficency is lost because of heat loss.

Or, the small turbo simply maxes out. I would be very concern about having a tiny turbo. It actually IS a lot more stress to the drivetrain and engine than bigger one (of course depending if you go higher with boost, but even with the same amount of psi, but please do notice that with bigger turbo the same psi isn't the same amount of air flowing into the engine. It's more.) and it WILL have more restriction on exhaust, which leads to backpressure issue, which leads to a possible overheating issue.

From what I've experienced during my few years on boosted KL03, I wouldn't bolt on anything smaller than a decent sized T3/4 hybrid for thoughts about even +50% power increase without having to worry about the engine stress. That goes even for low boost. Always, and I do mean always, design your system so it will support somewhat bigger amount of power than it is. That way, you might have your boosted Mazda next week too.

That's my thinking and my point of view, other may think different. What I can say, I've had my car turbo'd for 2 years soon, and I haven't blown the engine yet. *knocking the wood*

I'm all excited to see what happens on the dyno. I have butterflies on my tummy, telling me that something might break up... We'll see.

Mici

 

[DrBrown]

From what I've experienced during my few years on boosted KL03, I wouldn't bolt on anything smaller than a decent sized T3/4 hybrid for thoughts about even +50% power increase without having to worry about the engine stress.

Dont get me wrong, I know that your no newbie, but that makes no sense. Because a huge hybrid turbo will still have a T3 exhaust hot side. The only part of the t3/t4 thats bigger is the compressor housing and wheel so it pushed more air at the same exhaust flow as the t3. If you have a hybrid with a stage 2 or 3 turbine wheel thats the only way its less stressfull for backpressure and exhaust flow because it allows more gasses to pass the turbine w/out spinning the blades as fast. The compressor doesnt affect the backpressure so in theory the T3's and hybrids are the same. A T3 super 60 with a stage 2 turbine is actually the best designed turbo for our cars as far as making the most power by 6250 where these engines top out at. Unless you have upgraded internals like cams and modified compression. Because that would change the stock powerband to high end and you could serve better use with a larger hybrid for boosting past 5k rpms. :shrug: All I know is that turbos destroy these motors any way you look at it so BOOST EM AND LIKE IT!

 

[Mici]

Dont get me wrong, I know that your no newbie, but that makes no sense. Because a huge hybrid turbo will still have a T3 exhaust hot side. The only part of the t3/t4 thats bigger is the compressor housing and wheel so it pushed more air at the same exhaust flow as the t3. If you have a hybrid with a stage 2 or 3 turbine wheel thats the only way its less stressfull for backpressure and exhaust flow because it allows more gasses to pass the turbine w/out spinning the blades as fast. The compressor doesnt affect the backpressure so in theory the T3's and hybrids are the same. A T3 super 60 with a stage 2 turbine is actually the best designed turbo for our cars as far as making the most power by 6250 where these engines top out at. Unless you have upgraded internals like cams and modified compression. Because that would change the stock powerband to high end and you could serve better use with a larger hybrid for boosting past 5k rpms. :shrug: All I know is that turbos destroy these motors any way you look at it so BOOST EM AND LIKE IT!

You're absolutely right. How I didn't see that. Duh. Even the "bests" makes mistakes. :lol: Oh well... I still love my T4.

Geez... *blush*

Maybe I'll just shut up on turbos for now on...

Mici