Where does the extra horsepower come from in the new l15a? This is important for us modders to find out and may be why companies like KraftWerks dont wan't to touch this car.

Increased compression?
Redesigned heads with bigger valves?
Redesigned Intake and Exhaust?
Less power diverted to accessories?
We have ivtec, what did the old one have?
Is the ECU still compatible with piggybacks?

 

They have simply allowed the engine to rev higher, hence more power. Higher redline @ 6800, peak power 88kw now at 6600. Compared to 81kw at 5800rpm on the old l15a, someone please correct me if i am wrong with the figures.

 

Thats part of it, the rest of the max power comes from the full i-Vtec and better breathing.

Bigger difference is the increased low end torque, resonator intake and cast in head exhaust manifold which may also be why Kraftworks is shying away.

Probably the best info you will find is in this link
2009 Honda Fit - Powertrain - Honda - Press Releases - Selected Story

 

Until today I didn't know the manifold was cast in like that. That's crazy I've never heard of that although I can see the manufacturing/reliability advantage. Well that pretty much rules out turbos; placing one at the end of the stock manifold would probably take forever to spool.

 

Yea I heard that honda built the GE's to be pretty much unmoddable for the engine part. Unless of course you rebuild the L15 motor wit new pistons and such to make it faster. I think I saw a post by someone who did this and had like i think 300hp. Or stuff a k20...

 

https://www.fitfreak.net/forums/fit-...turbo-kit.html

theres no real info on #s... but its nice to see theres a company trying to step up to the challenge

 

Not to hijack the thread, but I thought Kraftworks (sp?) is trying to design a supercharger kit for the GE8 because of the cast in head manifold?

 

I am not saying it cant be done. Just if it is true (that Kraftworks wont do it? and if the OP is in the 'know'?) thinking of possible reasons why.
The cast in manifold would not kill a supercharger at all. Turbo? Well you probably couldnt hang the weight of a turbo on it and the heat could be an issue. So you would have to keep that in mind with the design.
My wifes Civic has the cast in head header also.
If a kit is available for the non Si Civic then no reason a turbo would not work except more room with the civic as the cast in head exhaust manifold is on the front.

 

Source: https://www.fitfreak.net/forums/2nd-...tml#post586772

If anyone finds out any such information poking around please post it here for reference.

 

I do recall jdmchris.com saying that the jacksons said the the ge8 would be great/better than the gd3 to supercharge, but had no definite plans.

 

So far from what I have ready, it seems that the ECU is the main stumbling block.
Not sure if any companies are working on solutions yet, if they are they're doing it quietly.