4g63 vs the EJ

[e[tx]]

Horsepower, dyno queens, roll racers. Everything is bias. I want to talk pure mechanics and if someone can inform me why an inline four motor can easily make 1000whp and our EJ's cannot that would be awseome. As a probably wrong guess Im going to say it has something to due with our cylinders being spread apart and the crank and cams and engine having to work more. Thats probably wrong but hey, educate me thanks .

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[Got Boost?]

there are so many reasons....this could get ugly

[e[tx]]

Originally Posted by Got Boost?

there are so many reasons....this could get ugly

Oh ****, what the hell am I supposed to search for to find such threads?

[mxpunk]

Originally Posted by e[tx]

Oh ****, what the hell am I supposed to search for to find such threads?

if you search you can see there are some references in regards to 4g63t's

[SlverEJ20]

I'm popping my popcorn before the show starts.

[brocksdad]

I'll start the list:

1) Cast block.
2) Flow of head. (Look at the size of the ports)
3)

[Got Boost?]

Originally Posted by brocksdad

I'll start the list:

1) Cast block.
2) Flow of head. (Look at the size of the ports)
3)

subaru motor is fairly new in comparison to the 4g63, turbo manifol has shorter runners on the 4g63, blah blah blah

[seanathanq83]

i am no sure the cast block has so much to do with it, i have seen 4g63's that are sleeved as well, flow of heads is alot, dont have the dog leg. can spool a bigger turbos easier because of shorter runners, bore, rod length, stroke, all different. and like they have said 4g63 has be around alot longer, if you notice subarus are making good power 800whp+ ,and running great times in the 1320. and if you look at 1320 times the first evo to make it sube 8 sec has a solid axel from a toyota under it. also evos do not make 1000whp easy.

[sku81]

[quote=seanathanq83;27024390]
1] flow of heads is alot,
2]dont have the dog leg.
3]can spool a bigger turbos easier because of shorter runners,

and like they have said 4g63 has be around alot longer, quote]

I agree with the 3 points above ...but

Ej20T started in 1989..when was the first 4g made?

Kris

[seanathanq83]

1983 in the mitsubishi chariot, but from what i have seen it looks like it started as a 1.5 liter 4g61

[Homemade WRX]

they are apples and oranges put simply...I can't think of one common variable between the two.

I will largely say the taller deck they have allows more stroke and smaller bore with a decent rod ratio.

Cylinder head flow isn't so much of an issue but I'd say more of 'balance'.

Our blocks (more importanly mains) join with two pieces allowing for lots of flex and wobble.

Exhaust manifold design limitations for us, likewise intake manifold limitations.

Our goofy firing order which also correlates with the above comment.

I'll also look at valve lift differences (we lose).

etc....

This thread has been done before several years ago.

Regardless of US not playing with the EJ25 platform for long, their 4G63 platform has largely stayed the same. The rest of world has had DOHC EJ's to play with for a long time. We didn't get the EJ25 (build motor of choice for U.S. Tuners and TRP) until the 2004 STi.

[domestic_abuser]

Originally Posted by Got Boost?

subaru motor is fairly new in comparison to the 4g63, turbo manifol has shorter runners on the 4g63, blah blah blah

Yep

Originally Posted by Homemade WRX

they are apples and oranges put simply...I can't think of one common variable between the two.

I will largely say the taller deck they have allows more stroke and smaller bore with a decent rod ratio.

Cylinder head flow isn't so much of an issue but I'd say more of 'balance'.

Our blocks (more importanly mains) join with two pieces allowing for lots of flex and wobble.

Exhaust manifold design limitations for us, likewise intake manifold limitations.

Our goofy firing order which also correlates with the above comment.

I'll also look at valve lift differences (we lose).

etc....

This thread has been done before several years ago.

Regardless of US not playing with the EJ25 platform for long, their 4G63 platform has largely stayed the same. The rest of world has had DOHC EJ's to play with for a long time. We didn't get the EJ25 (build motor of choice for U.S. Tuners and TRP) until the 2004 STi.

/thread

[CatfaceType-R]

shorter exhaust path, higher ve, better turbo placement(exhaust path), stronger and can take more knock counts before going bye bye

[FuJi K]

If you build up a Subaru engine for 1000whp, you can do it if you know how. The EVO's that do it are not anywhere near stock components at all.

Sleeve the block, balance the rotating assembly, choose a decent CR for the turbo to be used, good cam specs for revs, good flowing heads to allow it to breath, good fuel injectors/system and good pumps, then good oiling... a few others.

There are just not many 1000whp builders. You work the engine hard.

[japslapr]

Originally Posted by FuJi K

If you build up a Subaru engine for 1000whp, you can do it if you know how. The EVO's that do it are not anywhere near stock components at all.

Sleeve the block, balance the rotating assembly, choose a decent CR for the turbo to be used, good cam specs for revs, good flowing heads to allow it to breath, good fuel injectors/system and good pumps, then good oiling... a few others.

There are just not many 1000whp builders. You work the engine hard.

NOt saying it can't be done. Just WAY easier with the 4g63. Leave motors bone stock and add a 20g... the differences in the motors will be magnified. 4g63 will make significantly more power.. sooner... and with a broader powerband. If you're only goal is to make 1000whp out of a import motor... you don't choose a Subaru to mod on. People that go to lengths with these cars just love them for one reason or another. Not to mention.. our community is way better IMO.

[3MI Racing]

Originally Posted by japslapr

NOt saying it can't be done. Just WAY easier with the 4g63. Leave motors bone stock and add a 20g... the differences in the motors will be magnified. 4g63 will make significantly more power.. sooner... and with a broader powerband. If you're only goal is to make 1000whp out of a import motor... you don't choose a Subaru to mod on. People that go to lengths with these cars just love them for one reason or another. Not to mention.. our community is way better IMO.

+1 to that..no doubt it an be done but vastly different communities...Evo boys also spend more.