2zz engine/transaxle/supercharged k20 swap

[MikeW]

Originally Posted by exigeme

For all of those who are wondering what happened to me I just wanted to
touch base and let you know I have been staying away from posting because
I have made little progress on the car. Life has gotten in my way and I have been focusing on other issues like a remodel that will be finished soon. When you get burned out on a project and it becomes a chore rather than enjoyment it is best to take a break and let time recharging your battery. Soon I will finish my remodel and the car is next on my list. If all goes as planned the car will be running this summer. Sorry to disappoint all those who have followed my progress but I promise to get after it again soon.

If you get tired of your own projects, I have about 45 more over here you can finish for me! Good luck with the remodel.

[lowboost]

good luck with the project, I hope you become excited about it again. I know what you mean when you say chore.... most people after they finish a project are so burned out on it that they sell it shortly after (me with my supra and MR2) I dont want to feel that way about the elise.

[david hasselhoff]

Originally Posted by Dragon

They have TONS more Torq than the 13B and a sweet exaust note... The turbo'd one sounded like a F1 car at high rpm's and just sounded deep and pissed at idle. The N/A one sounded like a swarm of locusts at idle and like it was going to inhale the world the second the throttle bodies opened. They hold up better as well since the power is divided up over 3 rotors. Ie. 600hp on a 13B is 300 per rotor where as 600hp on the 20B is 200 per rotor + way more torq since you have one more power stroke per revolution. They are however fuel pigs.

Dragon

Very cool 20B mods… I was always wondering if its possible to put one of these thing in a old esprit with the Citreon transaxle. On the N/A 20B motor, is the compression high enough? Wasn’t all 20B turboed? Any idea how much power coming out of the N/A motor? Nice work on the ITB fabrication…who makes the throttle bodies and fuel rail?
Although they are still lighter than recipicating motors, Ive heard rotories are relatively heavy for the small psychical size. Whats the weight on a N/A motor without the turbo plumming?

I’ve hear a few 4 rotor “Kazu” running in an a endurance race. Your description of it sounding like a F1 car is no cliché. They really do sound like that. At the same race it made the Ferrari 333SP sound pedestrian.

Thanks for posting

[lotus4fun]

Any update on this K20?

[exigeme]

I am embarrassed to say no real progress to speak of other than the custom
dry sump design is coming along. Too many other things have taken the lead over the Lotus project. Just got back from the midwest helping to save the family home from floods. Boy do I hate sandbags!

This project will get finished I promise.

[jim-clayton]

update ??

[dustylax]

with the prices of the motors these days a mild build of an all motor k24 is very reasonable for the power you will make NA. We have had multiple k24's consistantly dyno 270-280whp, yes NA on 93 pump gas, seems like the perfect swap for an elise.

good luck finishing up the swap, any power goals ? 375whp ?

[exigeme]

Jim, good to hear from you! Dusty my power goals are 400 hp at the wheels but at the rate I am now moving, there may be no gas left when I finish! I sound like a broken record here but my job has been stupid busy and I have been on the road constantly. The project is at a complete stop and I have not even thought about it in months. Hopefully I will get started again soon and be able to use the car again next summer. Thanks for reminding me!

Dan

[dstevens]

Don't go with the K24 - the limited rev range is not as good as the K20A.

[exigeme]

Is that a McCarthy setup? Not to worry mine is a k20 slightly bored with a stock stroke, supercharged cams and headwork, safe to 10k rpm.

[meekster]

Originally Posted by exigeme

Is that a McCarthy setup? Not to worry mine is a k20 slightly bored with a stock stroke, supercharged cams and headwork, safe to 10k rpm.

7 month bump....

If I read this right the issues began with the SC the K20A fits nicely replacing the 2ZZ but you have to either fab the conversion or buy a kit. Paul McCartney has a kit? not much weight loss, gobs more torque, more rear weight bias? near bulletproof engine, tranny.........why aren't there more of these......?

[Aedo]

Originally Posted by meekster

7 month bump....

If I read this right the issues began with the SC the K20A fits nicely replacing the 2ZZ but you have to either fab the conversion or buy a kit. Paul McCartney has a kit? not much weight loss, gobs more torque, more rear weight bias? near bulletproof engine, tranny.........why aren't there more of these......?

cost

[smokin orange]

Just marking for further refrence.

[Aedo]

Originally Posted by smokin orange

Just marking for further refrence.

The easiest way to do this is by subscribing to the thread (under thread tools at the top of the thread)

[Lawy'du]

Originally Posted by dstevens

Don't go with the K24 - the limited rev range is not as good as the K20A.

for high boost though the k24 is much better. The best setup that i've seen is a k20a motor with a k24 head. This with a turbo put out more than 600 to the wheels

[...m...]

Originally Posted by Lawy'du

for high boost though the k24 is much better. The best setup that i've seen is a k20a motor with a k24 head. This with a turbo put out more than 600 to the wheels

...that's only 3.3 pounds per hoursepower - at what point would you consider power undriveable on a two thousand pound car, track and street?..smoothly controllable throttle is often considerably underrated in these threads...

[ZAMMY1]

as the saying goes: too much is never enough!

[codymac]

Originally Posted by ...m...

...that's only 3.3 pounds per hoursepower - at what point would you consider power undriveable on a two thousand pound car, track and street?..smoothly controllable throttle is often considerably underrated in these threads...

Gerhard Berger and Teo Fabi proved it's somewhere north of 1500hp (allegedly, but at least 1000hp) in a 1200lb car: Benneton B186.

Prior to that, Mark Donohue showed us what an 1800lb car with 1500hp could do: Porsche 917/30.

On cable throttle cars, it's as easy as machining a cable cam that applies the pedal action in a non-linear rate.

[xtn]

Originally Posted by codymac

On cable throttle cars, it's as easy as machining a cable cam that applies the pedal action in a non-linear rate.

And on TBW cars it's as easy as mapping your TPS to a curve that would replicate such a cam.

Smooth throttle control can be achieved regardless of the horsepower level of the car. It's more a question of can the driver control his foot or not?

xtn

[Lawy'du]

Originally Posted by ...m...

...that's only 3.3 pounds per hoursepower - at what point would you consider power undriveable on a two thousand pound car, track and street?..smoothly controllable throttle is often considerably underrated in these threads...

That's very true, and it would be even more troublesome to control all of that power with a car which has such a short wheelbase as the exige/elise.