4EFE differences

[Jay]

It's not often I have a topic worth public discussion but I'd love to hear some feedback on this one.

How does the exported 4EFE (75bhp) differ from the Japanese 4EFE (100bhp)?

I know for a fact that the injectors and ecu differ but would there be internal differences as well? it might explain why some turbo'ed 4EFE's last longer than others..

Thoughts welcome guys,

Jay

[ivan]

1. differences in the rods, where the jap spec uses 4efte rods.

2. differences with valve springs, and im talking BIG differences.

3. differences between ignition (exported models had coil-in-dizzy where jdm had seperate coil)

4. Inlet manifolds are different, the jdm used the 4efte manifold.

5. crank pulley is larger, and hevier on the jdm (same as 4efte). They are both harmonic balancers however, regardless of what some may say. They both have a rubberised compound in the middle.

Thats all that comes to mind right now, but there are definately more.

[jezza323]

rev limit - 6200 for crappy one, higher for other model

[Jay]

Interesting - so basically the JDM 4EFE is much closer to the 4EFTE wereas everyone else got a watered-down girlie version?

I'm guessing the 75bhp exported 4EFE would immediately shit itself if I popped the injectors, inlet manifold, ECU and ignition system onto it...or would it slowly soil itself over a period of time instead?

[jezza323]

mine valve bounces @ about 6700 rpm cos of the crappy valve springs

also the intake manifold is more restrictive, giving more torque down low, but less up top. mine makes peak power @ about 5700 rpm or so now

but the lighter internals (rods) would help it to rev quicker than the model with the stronger rods, just a question of how long they will last.

EDIT: also the cam profile may be different, cant confirm or deny this though

[ivan]

The cam lift is the same, i can confirm that, however the duration i am not sure of.

When turbocharging a 4EFE (non jdm) the motor will shit itself, die in the ass and with spin a bearing, valve bounce like nothing else, detonate to the shithouse, snap a rod and put a hole in the block.

basically its not worth it. You are better off buying a 5efhe (jap spec), changing to lower comp forged pistons and be done with it.

ivan

[Jay]

That's some good info there lads, thanks for the heads up.

I have a uk-spec 4EFE and would like to increase the power. because I have a spare JDM 4EFE from an EP85 lying here I was toying with the idea of swapping a few components across but I hadn't heard of the valve spring difference until you mentioned it. That's probably saved me a few $$ and a shitload of hassle!

So basically it would make much more sense to drop the JDM unit in complete.

Guess I could test the crappy UK spec one to destruction if I wanted to seeing as there's a perfect replacement available.

[jezza323]

i will be swapping 4efte valve springs and 5efhe cams into my 4efe sometime in the near future.......then sticking quad throttles on it

its all just a matter of time and money

[ivan]

personally, if i were you i would get my hands on a 5efhe engine, and a put your jdm 4efe head on it (that you get ported) and throw in some forged pistons. It would be a reasonably cheap engine that will definately make more than 300hp depending on turbo/boost/fuel.

Ivan

[HardcoreEP]

The 100hp 4EFE was only available in the EP82 Gi which was a N1 homologation car. The highest hp FE after that is the 85bhp EP91 Glanza S