So I am seeing alot of interest in boosting L15A engines but can the cylinder sleeves and pistons handle the extra pressure? It seems that step one towards boost should be getting your engine sleeved and rebuilt to accomodate high boost?


Regarding the transmission, I am interested in an automatic for the paddle shifters (I do not own a fit yet), but I am wondering how much HP and Torque can be safely put through a low end paddle shifted transmission like that. Don't get me wrong I would love to have a fit but it is essentially an econobox, and I must wonder how much power the tranny can handle.


I am not planning on a massively built car but is 140-160 hp safe through a stock auto tranny? Is is possible to upgrade the auto tranny and retain paddle shifting?

 

No one has anything to say about the fit engine or tranny?

 

from what i've heard. sleeves are good up to 10psi. rods and pistons are good up to 19psi.

but i'd keep it at 10psi max for dd.

 

Bump out of concern for the tranny.


Would increased HP and Torque be ok with the stock L15A tranny? (Auto - using paddle shifters)



Thanks in advance if an engine guru can advise me.

 

depends how much you are adding. I know for sure if you want to turbo @6psi ~165whp, you'll prolly want a new clutch, stock one will slip.

I haven't heard too many complaints about the tranny.

 

man, all i can say is look to an recent post i made about the L15A7 engine and Formula Fords series. They are going to use our engines with total STOCK internals and everything else (aside from a few bespoke items such as: dry sump oil system. and new intake manifold for the formula type intake they have. other than that-its TOTALLY STOCK! and by the way. HPD (the performance arm for racing at Honda) ran the engine on a engine brake for 40+ hours at 6000rpm w/ no failures AND the engine was NOT out of spec!!! so if that doesn't prove its reliability....then I don't know what will! Now the tranny.....that's a totally different worry.

 

xx psi on what size turbo? Don't talk about psi; talk about hp/tq when discussing engine durability.

Ok, and are they boosting these engines?

Original poster: you'll be hard pressed to find anyone who's boosted the GE engine as nobody has posted that they've done it yet.

 

We have made 12psi of boost successfully on FIT GE AT with Garrett GT28RS turbocharger . The tranny is fine.
However, you must have an ATF cooler installed in case of ATF overheat.
I will post the the whole piece of work in couple days.

 

Please let us know what kit you have and pics would be great

 

I will start a new thread in FI forum.

 

thanks! lookin forward to checkin it out

 

how'd you overcome the dreaded "intergrated headers" deal that i hear makes things so difficult

 

Please refer to https://www.fitfreak.net/forums/2nd-...it-fit-ge.html

 

Hyundai did run their new 2.4l at Peak HP for 300 Hours on a dyno... Any motor that blow at 6000Rpm before 40 hours is junk!!

Chrysler had a bizzare way to test the new Hemi for thermal shock that was a real pein for the motor... dont remember what it was but i think it was putting -sumthin' °F Coolant in a properly warmed Motor repeted number of times....

As for any A\T of any brand, check the fluid frequently!! If it's brownish and smell burned, change it no matter what!! If you put a Turbo, install a small A\T cooler and try to monitor Fluid temps at load!!

MArko!!

 

I have a boosted Honda City ( Thailand), basically same engine as the fit. Running 0.5 bar boost, Fujitsubo exhaust, Tein racing suspension, ATS lsd, racing clutch, Mugen short shifter, Greddy Ultimate ECU,ATS 6 pot brakes, E-Drive throttle controller and standard 5 speed gearbox. I have had no trouble with the gearbox at all. With an automatic you might have some problems witht he torque converter though and you MUST install a ATF cooler or else you will definitely have trouble. I Thailand the L15A engine is amde here in BKK and the quality of the engine parts can be questioned. I will be going to high boost later this year but will be doing some internal upgrades to the engine before i do so on recommendation from Honda Racing here in Thailand. Good luck and hope this helps in some way.