I4 vs H4 ... Evo vs STi ... which engine is easier to work on?

[CraigRT]

Originally posted by: TuffGuy

Originally posted by: Skoorb
I would say the mitsu will be easier because it will break so frequently that you'll become comfortable and experienced with working on it :evil:

mitsu engines are bulletproof, especially the 4G63.

now this I truly believe has to be a joke...

 

[TuffGuy]

Originally posted by: CraigRT

Originally posted by: TuffGuy

Originally posted by: Skoorb
I would say the mitsu will be easier because it will break so frequently that you'll become comfortable and experienced with working on it :evil:

mitsu engines are bulletproof, especially the 4G63.

now this I truly believe has to be a joke...

?

or are you just pulling sh!t out of your ass?

 

[Eli]

Originally posted by: CraigRT

Originally posted by: TuffGuy

Originally posted by: Skoorb
I would say the mitsu will be easier because it will break so frequently that you'll become comfortable and experienced with working on it :evil:

mitsu engines are bulletproof, especially the 4G63.

now this I truly believe has to be a joke...

It's easily just as bulletproof as the STi's H4.

That said, the I4 will be easier to work on, hands down, no questions asked.

 

[Vic]

But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

 

[halik]

Originally posted by: Flyermax2k3

Originally posted by: TuffGuy

Originally posted by: Skoorb
I would say the mitsu will be easier because it will break so frequently that you'll become comfortable and experienced with working on it :evil:

mitsu engines are bulletproof, especially the 4G63.

Word!
4G63 powah baby!
It's not the engines that break, it's all the other stuff attached to em

haha 4g63 for life!

<- former tsi awd owner

 

[TuffGuy]

Originally posted by: Vic
But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

i wouldn't be modifying the internals.

i'm referring to the ease of doing simpler stuff, like vishnu's stage 1 for example.

 

[Eli]

Originally posted by: Vic
But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

Nice. :Q So that's what, a good 450 at the crank?

Got more details??

 

[Vic]

Originally posted by: TuffGuy

Originally posted by: Vic
But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

i wouldn't be modifying the internals.

i'm referring to the ease of doing simpler stuff, like vishnu's stage 1 for example.

That's just a turbo-back exhaust and the XEDE ECU. Very easy. I can't imagine it being harder to do that on the STi than it would on the Evo.

 

[Vic]

Originally posted by: Eli

Originally posted by: Vic
But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

Nice. :Q So that's what, a good 450 at the crank?

Got more details??

Yeah, at least 450 at the crank. I just popped by pdxtuning for a few minutes the Sunday before last and watched them run that monster on the AWD dyno. They lease dyno time at Matrix Engineering, right across from the Old Spaghetti Factory down off Macadam. They haven't updated their site in a while, and I don't know when their next dyno weekend is, but I can give you a heads up when I find out.
Most likely, they'll be tuning my WRX when I finally get off my ass and finish it in the next few months. I'll be right at a Stage 2 and expect about ~225 whp (stock on their dyno is at 165).

 

[TuffGuy]

Originally posted by: Vic

Originally posted by: TuffGuy

Originally posted by: Vic
But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

i wouldn't be modifying the internals.

i'm referring to the ease of doing simpler stuff, like vishnu's stage 1 for example.

That's just a turbo-back exhaust and the XEDE ECU. Very easy. I can't imagine it being harder to do that on the STi than it would on the Evo.

i heard that it was fairly tedious. that you have to remove a lot of stuff to replace the first cat.

the 46g3 is fairly simple to work on, but i've never touched a boxer. just the way it looks scares me.

 

[Howard]

Originally posted by: Eli

Originally posted by: Vic
But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

Nice. :Q So that's what, a good 450 at the crank?

Got more details??

A lot more. Subaru's AWD system sucks up crazy torque.

 

[jpeyton]

Originally posted by: TuffGuy

Originally posted by: Skoorb
I would say the mitsu will be easier because it will break so frequently that you'll become comfortable and experienced with working on it :evil:

mitsu engines are bulletproof, especially the 4G63.

Indeed, the 4G63 is a versatile and bulletproof engine. Takes a ton of boost.

 

Originally posted by: TuffGuy

Originally posted by: geno

mitsu engines are bulletproof

Yeah especially the ones in first gen DSMs that crankwalked like it was going out of style

Not *all* of their engines are bulletproof

that was in the second gen, it was limited to a couple of years, did not happen on both turbo models (IIRC), and occurs due to abuse (IIRC).

Someone abusing a turbocharged motor?!??!?! NO WAY!

The H4 isn't any harder to work on than the I4.

 

[stev0]

my buddy has a 03 wrx... pain in the ass.

installing the intercooler (front mount) was the worst idea we ever had. don't even get me started on the rest of the stuff :|

 

[Zenmervolt]

I've worked on flat 4's and inline 4's and the inlines are generally easier to work on. Dropping the exhaust system from a boxer engine is really pretty easy, it usually comes out the lower side and the bolts are much easier to get at than they are on an inline engine. That's about the only thing on a boxer that's easier. Changing spark plugs can be a real pain sometimes (though even on my 914 with is mid-engined with a boxer engine and an opening about the size of a mail-slot I can change the plugs in about 20-30 minutes).

ZV

 

[Eli]

Originally posted by: Howard

Originally posted by: Eli

Originally posted by: Vic
But what work would you need to do to an STi motor's internals?? I've personally witnessed a modded STi put down about 400 WHP on stock internals (just full exhaust, intake, bigger turbo, FMIC, walbro fuel pump, and ECU reflash).

Nice. :Q So that's what, a good 450 at the crank?

Got more details??

A lot more. Subaru's AWD system sucks up crazy torque.

Yeah, I figured it was kinda lowball, especially since we're talking about AWD.

I was going to say 475-500 as my first guess, but then I thought about it again and maybe I was just hoping that their AWD was more efficient than that. lol..

 

[AsianriceX]

Originally posted by: TuffGuy

Originally posted by: geno

mitsu engines are bulletproof

Yeah especially the ones in first gen DSMs that crankwalked like it was going out of style

Not *all* of their engines are bulletproof

that was in the second gen, it was limited to a couple of years, did not happen on both turbo models (IIRC), and occurs due to abuse (IIRC).

I don't know if they found a real cause for the crankwalking problem other than the fact that it only happened on 7 bolt 4G63's. I remember reading a ton on dsmtalk back when I was considering a turbo dsm and although many people had theories as to why crankwalk would happen, no one had a definitive answer. I remember people trying different solutions with bearings, clutches, analyzing the oil squirters, or even sawing a 6 bolt and 7 bolt engine in half to see if there were any changes in chemical composition.

There are even instances of where an engine would crankwalk, be rebuilt and go a few thousand miles before crankwalking again. I think the latest theory is that there was some design flaw in the thrust bearing from 95-97.5. Mitsu must have noticed something and tried redesigning it for 98+.

I don't think anyone knows exactly what makes those engines crankwalk, and even though it's certainly a bad thing, I wish I hadn't passed on a stock white 95 Eclipse GSX back when I was in the market.

 

[TuffGuy]

Zenmervolt - Thanks for the feedback. You said that changing the spark plugs is a pain, and I've heard that getting to the up-pipe is too. Is there a reason why the H4 looks so busy? The Evo's engine bay (I4) looks much roomier and neater.

 

[Vic]

Unlike the WRX, the STi's uppipe is catless and does not need to be replaced for modding. The "first cat" is in the downpipe.

 

[TuffGuy]

thanks bud, i didn't know that. off the top of your head, do you know how much power a test pipe gives?