I'm looking at building a SCCA Fit road race car. The engine must be stock but you can balance and lighten (if necessary) rod's, crank. Exhaust is free , no cat, headers OK, basically anything you want. You can increase comp. to 11:1 and cam lift to 0.390in at valve. I believe you can remap the fuel as well. No porting or polishing but you can gasket match to 1in. each way.

Any guesses what the 2007-8 1.5 engine might produce in this configuration?

Thanks

 

Im guessing 130whp or so.... i think its possible to get a nice bolt one package WITH a good tune, can do 115-120whp with a stock cam etc. Unfortunately most people on this board do not have any competition experience or ambitions with this car. Most like to take the easy known route of boost which is most classes is not allowed. Are you allowed to touch the intake manifold? this is a area where an aftermarket or custom made unit will show much improvement

PM me and we can talk some SCCA Specifics. I actually have been planning a custom reground cam for the L15 myself. I work on a team that builds ITA/SM Miatas so im generally familiar with SCCA and road racing

 

i have been in contact with spoon and there fit has only work done to the bottom half. no head work and they are pushing 122hp. you can get a tuned motor from them but all they will do is lighten and balance the internals. head work to the fit is very difficult cause of the head design and wall thicknesses.

 

Thanks Guys,

I had posted the same notes on Honda Tech and only got lame results.

I am only testing the waters at this time as I would hate to build a new car and find out that it can't get the job done at Road America. I figured at 109 hp stock, I might expect a 15% increase based on free exhaust, little better cam and I could go to 40 over pistons.

One of my concerns is can you get a fit down to 1,650 lbs (without driver)with a roll cage? I believe the published weight is like 2,400 or something?

Who is this "Spoon"?

And Mike I'll drop you a PM.

Thanks

 

Along with what KylerWho said; other than forced induction I really don't see much going for this motor because it is so under square and has a narrow head.

I really think suspension and braking could be the strong points of this car.

 

i think the base model, 07-08 5MT is under 2400 lbs. you can drop an easy 400 lbs off the car in an afternoon if it's really race/track only, but i think that extra 400-500 is gonna be tough without spending a lot of money.

heck my dad's lotus europa was about 1500, and that thing was literally two frame rails, some wheels, an engine and a seat, covered in a plastic shell.

Spoon is a Japanese Honda tuner who prepped a fit for endurance racing. check out that car for some inspiration.

 

i thought our car weighed about 2500 pounds. anyway i heard you can lose 100-200 pounds getting rid of the airbags. take out the backseats and change the front seats to full racing bucket seats. i don't what you are allowed to do about the interior. strip the interior.

the honda fit is rated at 109 hp but people put down 80-90hp stock.

are you allowed to modify the brakes at all? if so you might want to invest in the brakes.

 

yes but remember the 80-90 hp is measured at the wheels, not the crank like the manufacturer's number.

 

If you read his post it doesnt matter if you cant do much to improve the head because YOUR NOT ALLOWED TO, however a cam would definitely yield some more HP's

Also keep in mind that the spoon HP numbers are to the flywheel not the wheels


FI is out of the picture, and i think you mean oversquare, it has a very long stroke compare to the bore, which is oversquare. There may not be HP numbers to be had, but there are plenty of thing that can be done to improve the motor for racing purposes. Unlike most of the tuner world, racing is about pushing the limit within the rules.

Just because could spend less to get 200whp with a K or turbo, doesnt mean you cant spend alot of time and work to get 135whp with the L. To me that is WAY more gratifying. I think everyone has to remember that he is racing in a CLASS within the rules, not trying to get HP bragging rights on the internet.



Yes you can easily get the car down to that weight, as other have mentioned spoon lighten the car a great deal to around 2000lbs in race spec

 

the spoon enduro spec fit weighs 1800lbs and some change.
when i spoke with them there mission on the fit was based only on the handling aspect of the car since they quickly found that the motor would not yeild high hp numbers even with custom cam grinds. their secret lays within the tune done by type one to the ecu.

 

hmm interesting... well see what i can do with a cam im working on.

 

i definately want to know how that custom cam will turn out.

 

an 07 to 08 fit sport weighs in at the high 2400's, even the base is not much lighter.


i can't remember all the requirments you posted, but unless you go f.i. (which i think is not allowed?) suspension, weight reduction, and lighter wheels are your best bet.

unless f.i is involved n/a l15's are kind of a waste.

 

lol... if he thought it was a waste he probably wouldnt have made this post.

Senario...

L15A engine
Goal: Max power within the rules and limitations

he didnt ask if the motor can make 200whp or be fast in a drag race or whatever you want to fill in the blanks with....

he SAID i have this motor to work with and can do this this and this and not that or this, what are your suggestions.

saying the motor isnt worth it is useless