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CRX Engine for Road / Autocross

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CRX Engine for Road / Autocross

Postby LemonStain » Tue Apr 18, 2017 9:38 am

What is a good engine for the CRX that would be very good for Autocross/Road racing? I want to feel like it has some nice power but also feel some good power for the straight shot.

I am not looking to completely break the bank either.


Long story short: My first car was a CRX when I was 16, as well as my 2nd car. I got out of the car scene for a long time cause when you are young, money doesn't come as easy as it was. I was into the drag scene, but recently got a taste of road racing (with super cars) this weekend and loved it.
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Re: CRX Engine for Road / Autocross

Postby jfrolang » Wed Apr 19, 2017 9:24 am

The champions of autocross favor a supercharged D16, because tight, technical and relatively slow autocross courses prioritize engine torque with minimal weight.

For road racing you're less likely to see consensus. Honda built the SiR with a B16 specifically for road racing, but these days you may be better off with a K-series. If you're racing competitively the rules for your class will be a big part of the decision making process, along with budget and your capability.
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Re: CRX Engine for Road / Autocross

Postby raffaelli » Wed Apr 19, 2017 11:45 am

Before you open your wallet, figure out what you want to do, what class, what club, what you want to tinker with, what you want to be able to tinker with. Worst thing you can do is spend some money and then figure out there isnt a class for you.

I am currently running my 91 CRX with a D16. The engine build didnt break the bank, lots of fun and is fast enough in my class (SCCA ITA, EMRA ST7).
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Re: CRX Engine for Road / Autocross

Postby Dave_Darling » Thu Apr 20, 2017 12:50 pm

Step Zero is always to RTFR--Read The Rulebook.

In some instances, engine swaps can add the requirement that you use a lot more safety equipment than you might otherwise need. While more safety equipment isn't bad, it can be a pain to live with in day to day driving.

Usually engine swaps will put you into classes where you will need to do an awful lot to the car in order to be even close to competitive.

If you're not willing to do a crap-ton of suspension work, adding lightness, roll cage fab, and so on, it may be best to stick to the stock engine.

Besides, you have have an awful lot of fun in a basically stock CRX...

--DD
"Mango Bango", 1990 CRX Si -- Sold on 10/01/11, with over 227,000 miles.

VTEC is Honda's "select a cam profile on the fly" system; VTECH is a crappy phone.
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Re: CRX Engine for Road / Autocross

Postby jwharnish » Tue Apr 25, 2017 10:37 pm

raffaelli wrote:Before you open your wallet, figure out what you want to do, what class, what club, what you want to tinker with, what you want to be able to tinker with. Worst thing you can do is spend some money and then figure out there isnt a class for you.

I am currently running my 91 CRX with a D16. The engine build didnt break the bank, lots of fun and is fast enough in my class (SCCA ITA, EMRA ST7).


I agree with determine which class you want to run in, and if you still plan on driving the car on the street. If the car is to be street driven plus Autocross competition, you have a choice of Street class, or STS. STS is more rewarding, and unless you build it to the limit, can still be a good street driving car. STS 2016 SCCA National Champion was an 88 CRX.
A stock class CRX can be made to work, but requires some expensive shocks, 15x5.0 rims, and a decent rear bar. Either choice will give you an good, reliable, fun to drive car, with the original d16.

I currently run my 88 CRX Si in HS, and can run with most of the best HS cars in the country.

Jim Harnish
1988 CRX Si 74K original miles.
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Re: CRX Engine for Road / Autocross

Postby Mista Bone » Wed Apr 26, 2017 1:31 am

Another thought is to not worry about class rules and build a safe HPDE car, aka the Honey Badger CRX.

<<< Transmission builder for road racers and autocrossers, I have the easy job!
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Re: CRX Engine for Road / Autocross

Postby cboutilier » Sat Oct 21, 2017 9:02 pm

I know, up here, any Honda/Acura motor swap into your CRX will automatically put you in SMF class. And if you're in a region like me, you'll end up in SM due to numbers.
1991 TGP Si: SMF AutoX build.
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Re: CRX Engine for Road / Autocross

Postby Mista Bone » Sat Oct 21, 2017 11:47 pm

Just a cylinder head swap will put you in SMF

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Re: CRX Engine for Road / Autocross

Postby cboutilier » Sun Oct 22, 2017 11:04 am

Mista Bone wrote:Just a cylinder head swap will put you in SMF

Image


It's a good class for those of us that like to swap and stuff. It pretty much allows for all of the usual street car mods we like to do, except traction bars.
1991 TGP Si: SMF AutoX build.
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Re: CRX Engine for Road / Autocross

Postby daveb91 » Sun Oct 22, 2017 2:41 pm

engine that came with car then,upgrade driver mod, tires, suspension then power.

I started out with a SC d16 and it was great power for small autox tracks but could have used more seat time.
91 CRX Si JRSC Turboedit ECU
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Re: CRX Engine for Road / Autocross

Postby cboutilier » Sun Oct 22, 2017 3:59 pm

This past event I was at, the second fastest raw time went to a 93 Civic Si hatch with stock engine. Only car that could beat him was a wild k24 swapped Miata.
1991 TGP Si: SMF AutoX build.
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Re: CRX Engine for Road / Autocross

Postby hispanicpanic » Mon May 14, 2018 10:35 pm

D series engines are the lightest by a fair margin, almost 100 lbs over a B series and 200 over a K series. Which is nothing to scoff at!!!

Your best chance at hitting an optimum HP/weight ratio is with a Turbo D. But don't pay attention to internet wisdom when it comes to these setups. Get a decent turbo (Borg warner EFR series with a mixed flow turbine), and a 9-10:1 compression ratio. Turbo D pistons commonly used bring compression ratios down to something like 7 which is utterly retarded. Make sure your cams and head are spec'd for turbo flow, and invest in a good engine management system and a professional dyno tune. Vtec is irrelevant, mostly, depending on cam choice.

With this setup, turbo lag on the EFR is literally non-existent, so there's no reason to supercharge. It's the only way to hit 300+ HP under 200 lbs. And depending on the amount of head work and turbo choice, you can still run more reasonable levels of power in the 200 range. Stock d16 rods are good for nearly 300 hp. Of course you'd want solid pistons to be hitting those levels.
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Re: CRX Engine for Road / Autocross

Postby 88k_crx » Tue Jul 17, 2018 3:28 pm

I am running a SIR b16 with a greddy td05-18g turbo charger and i road course.Image
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Re: CRX Engine for Road / Autocross

Postby 88k_crx » Tue Jul 17, 2018 3:51 pm

:D
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Re: CRX Engine for Road / Autocross

Postby hispanicpanic » Sun Aug 05, 2018 7:15 pm

edit
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