ka24de power for autocross

[Project S13]

Hey guys,

Does anyone have some good recommendations for NA KA power? Specifically lower speed power for an autocross vehicle? At the autocross events in my area the speeds usually stay around 20-50mph (average of about 30-35), the venues are rather small :/

Considering that the KA already has strong torque I thought it would be a good strategy to build on that strength for the low speed courses of autocross.Looking for suggestions or advice for performance from 20-50 mph.As for allowed mods I run STS, anyone have some helpful experience?

[whiterps13]

well other than the basic boltons (intake/headers/cat/exhaust) the few things you can do are cam changes, an underdrive pully, and some healthy dyno time. other than that, you could go turbo but with small autocross courses that money would be better spent on suspension. id say cover the basics, and see if you need more power.

[dickie]

what kind of cams can you get that shift the powerband lower or widen it in that aspect? most of the cams i see are for better top end...

[guyaverage]

Ditch your 248 exhaust cam for a '95 or newer 232 exhaust cam. It will bring your power band down. I'm running 240/232 on my vert w/auto and I love the low end and mid range with that combo. You might try 248/232 too, a lot of people seem to like that combo for a good mid range, but I felt the 240/232 had a better bottom end when I tried them both. You may even try the stock '95 cams 232/232 if you dont mind the high end loss, I was told by someone that wanted a strong low end and switched their '93 to that and said the low end torque was definitely improved over the stock '93 240/248 cams. It will pretty much make anything over 5K an even bigger waste of time than it already is, just be advised....

Someone here would probably give you a set of '95 cams to play around with if you asked nice. Folks around here tend to be in the high-rev loving crowd and 232/232 isnt good for that but it would give you some less rev-happy cams to find your best combo.

[dickie]

sweet. so your 240/232 runs well in the lowers, and a 248/232 would put the power in between 3500 and 5000rpm? what do you consider low/midrange?

where is your powerband with your cam setup?

[guyaverage]

I consider mid range as 2.5-5k. I rarely go over 5k anyway. 3k to 5k is the sweet spot on my setup (240/232). Noticeable improvement from 1500 on up.

[Project S13]

Anyone think anything of the JWT or other aftermarket cams?Also 2.5 would be abou the right exhaust size, yes?

[dickie]

guy, that sounds about where i want to make my power while im keeping my ka. im having work done on my car now so i may try this if i can get the cam pretty cheap.

[Jo 240]

I can't deside what i want to do with my car turbo or NA, i would do auto cross, but it's been canceled untell they find a venue... bummer, if i could do that i think i would go NA

What i was planing to do if i kept it NA would be Intake, 2.5 Exaust, headers/full exaust, cams, take off the motor fan to a electric fan, plugs, wires

Then i was also wondering about Porting your heads, how much (power/cost), Borring (power/cost), I was also told the ka24e pistons were higher compretion (is that pistons and rods?)

Critiqe the setup please

[SimpleEnigma]

If you are going to run NA, since this is what i am doing, i would definately do the standard I/C/H/E, spark plugs and wires, advance the base ignition timing, E-fan conversion, short shifter, new clutch, lighweight flywheel, LSD.

P&P is a pay-for-what-you-get type thing. Each machinist costs different amounts, depending on what you get done. Also, do research into the shop you use, some guys who dont really know what they are doin can really f-up your motor if the job isnt done correctly. just call up a couple of different places, see if they even offer what you need and go from there.

Lastly, the KA24E pistons, when put into a KA24DE motor, raise the compression to 11.1:1 CR, one of the guys on here, DeviousKA, sells them at HybridKA.com. but you would essentially have to run at least 91 octane fuel, if you dont already do so, and would net you a good deal of torque and hp combined witht the other mods.

[Tulsa_S-13]

If your going into autocross and don't plan on driving the car out on the streets much I'd go with the 180sx 4.36 LSD.

[fbodtrek]

Tell me where to find a 180sx rear (CA18 rear?), I'll buy it today! Be great for drag racing...the 4.08 rear sux...

[pregmantis]

gears will give you some accerlation and easier to install, kaE pistons will do it too.

[Project S13]

Lastly, the KA24E pistons, when put into a KA24DE motor, raise the compression to 11.1:1 CR, one of the guys on here, DeviousKA, sells them at HybridKA.com. but you would essentially have to run at least 91 octane fuel, if you dont already do so, and would net you a good deal of torque and hp combined witht the other mods.

That sounds fun. So with an intake/manifold, cams, ka24e pistons, lightweight pulley, electric fan, flywheel, header, exhaust, and high flow cat I would be in pretty good shape.

Have many people run the ka24e pistons in thier dohc without problems? I usually run 89 octance so 93 isn't a real big deal, but should I invest in some safety mods to make sure everything is well under the hood, or are the ka24e pistons pretty reliable with 91-93 fuel?

[Project S13]

I checked some guidlines in the scca rulebook to make sure and there's not so many options as I thought, found these two rules. Does that mean I couldn't alter the pistons, they're still ka24e pistons? =p Guess taht rules out a lighter flywheel as well. blah for STS.And as for engine management system mechanical, that would allow cams and adjust the mechanical engine timing, right?

# Emission legal modifications to Engine management system, either electronic or mehanical, but not both.# Engine and transmission must remain unmodified, including emissions equipment