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> 914 Hayabusa Build
eatpez
post Oct 4 2018, 11:31 PM
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My brother and I picked up a couple rollers and have started our builds. The plan is to put supercharged Hayabusa engines in them, upgrade the suspension and brakes and get them on the road (safely) before working on anything cosmetic.

We picked them up from Keith down in Nepoleon, OH and he recommended I document the build here.

My brother is working now on the fab for the engine cradle and sourcing the transfer case to drive the rear axles. My job at present is to beef up the suspension and brakes to handle the planned 300+HP.

Mine is the black 74 which will probably end up with steel GT flares. My brother's is the primed and glassed out 72.

Let the fun begin!

(If anyone has 5-lug / brake upgrade parts available, please PM me)


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second wind
post Oct 5 2018, 12:00 AM
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This is going to be fun.....imagine all kinds of 914's powered by who's knows what? Don't quote me on this....(in Topanga, Calif. thursday is little friday)...but a few small batteries and a itty bitty tiny electric motor could be really exciting....the way things are going...$4 regular is starting to bug me....
gg
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SirAndy
post Oct 5 2018, 12:07 AM
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100 ftlb of torque at 8000rpm doesn't sound like fun in a 2000+ lbs car ...
(IMG:style_emoticons/default/wacko.gif)
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porschetub
post Oct 5 2018, 12:22 AM
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QUOTE(SirAndy @ Oct 5 2018, 07:07 PM) *

100 ftlb of torque at 8000rpm doesn't sound like fun in a 2000+ lbs car ...
(IMG:style_emoticons/default/wacko.gif)

(IMG:style_emoticons/default/agree.gif) ,not even worth going there.
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Andyrew
post Oct 5 2018, 12:56 AM
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Sounds like a fun build! Looking forward to seeing the progress. I have concerns on in town driveability but I can't imagine it would be any worse than an old bug, but with 5x the top end..
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falcor75
post Oct 5 2018, 01:41 AM
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The busa engine is a rocket in something like a Seven but in a 914 with twice the weight I'm more sceptical. Curious but sceptical. (IMG:style_emoticons/default/smile.gif)
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mb911
post Oct 5 2018, 04:05 AM
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Its what they use on the cars at Disney for the stunts show.. They rip pretty good.
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jd74914
post Oct 5 2018, 11:12 AM
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QUOTE(SirAndy @ Oct 5 2018, 01:07 AM) *

100 ftlb of torque at 8000rpm doesn't sound like fun in a 2000+ lbs car ...
(IMG:style_emoticons/default/wacko.gif)

It's all about tractive force, not engine torque. Geared correctly it's a much different picture. In any case, 300 hp @ 10k is 157 ft*lbs of engine torque so not too bad. Hypothetically [to equate to a traditional car engine] with gearing to bring the input engine speed into a conventional transmission back down to normal, you'd be the equivalent of a 314 ft*lb torque at the input shaft. Not too shabby.

Interested to see some progress! (IMG:style_emoticons/default/smile.gif)
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jd74914
post Oct 5 2018, 11:14 AM
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QUOTE(eatpez @ Oct 5 2018, 12:31 AM) *

My brother is working now on the fab for the engine cradle and sourcing the transfer case to drive the rear axles. My job at present is to beef up the suspension and brakes to handle the planned 300+HP.

So are you making a shaft adapter to replace the sprocket? Or going with a chain drive differential like you'd see in a formula car. I made a shaft once on a dyno and it worked out pretty nicely.
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milwlandrover
post Oct 5 2018, 11:18 AM
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You guys never cease to amaze me, on both sides of the argument.
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tygaboy
post Oct 5 2018, 11:38 AM
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I have a project car that is motorcycle powered. It's a tube chassis Nash Metropolitan and I'm using a Honda ST1300 V4.

Just my $0.02:
The only real issue I'm worried about is how the stock motorcycle clutch will hold up to the added wright. I'm targeting 2x the ST1300 weight which gives me ~ 1300 lbs as my target.

In a 914, that Hyabusa engine is going to be asked to deal with somewhere upwards of ~ 3x the weight (Hyabusa weighs about 475 lbs).

I know they get upwards of 450 hp out of the turbo 'Busas so I'm sure there are uprated clutches available. I'd be focused on looking into this as an initial design item.

Best of luck w/the builds and remember: We LOVE, LOVE, LOVE pics!
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SirAndy
post Oct 5 2018, 11:49 AM
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QUOTE(jd74914 @ Oct 5 2018, 10:12 AM) *
QUOTE(SirAndy @ Oct 5 2018, 01:07 AM) *
100 ftlb of torque at 8000rpm doesn't sound like fun in a 2000+ lbs car ...
(IMG:style_emoticons/default/wacko.gif)
It's all about tractive force, not engine torque. Geared correctly it's a much different picture. In any case, 300 hp @ 10k is 157 ft*lbs of engine torque so not too bad. Hypothetically [to equate to a traditional car engine] with gearing to bring the input engine speed into a conventional transmission back down to normal, you'd be the equivalent of a 314 ft*lb torque at the input shaft. Not too shabby.
Interested to see some progress! (IMG:style_emoticons/default/smile.gif)

Have you ever driven a 914 with a high reving engine with comparatively low torque?

I have, and unless you are driving around a race track where you are near the rev limit for 95% of the time, those kinds of engines are the exact *opposite* of "fun to drive".

(IMG:style_emoticons/default/shades.gif)
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Rand
post Oct 5 2018, 11:50 AM
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Bikes weigh less than cars. I hope you get that first. I mean really get it. Some physics education might be helpful. The first time you want to impress your friends and drop the clutch hard.... All of that stuff laying around the street will be your blinging reward.
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tygaboy
post Oct 5 2018, 11:56 AM
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Forgot - Reverse is always fun with motorcycle powered cars. Here's what I did:
This is a Transworks MiniDif. It's a cut down VW transaxle with all but one forward gear and reverse removed. There's a lever that lets you switch between forward and reverse.

Pics are of my ST engine and then one with an inline 4 motor, like you're running.

So yes, with a motorcycle engine, you get just as many reverse gears as forward!

There are a few other options for reverse but I like this one since it allows for more ways to solve the grearing issues that tend to come when you move from motorcycle sized tires to car sized. At least unless you're running larger diameter tires.

Feel free to PM me, if I can help in any way.
Chris


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Rand
post Oct 5 2018, 12:04 PM
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Chris, I love how you always bring it to another level.
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Rand
post Oct 5 2018, 12:09 PM
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If you can turn down the music, this can be an interesting watch... (you may have to skip a lot to get to the good stuff..)

https://youtu.be/s5Q_rGllPVs
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andys
post Oct 5 2018, 01:06 PM
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Perhaps one might consider the Honda Gold Wing 1800 engine/trans; has a reverse. While HP numbers are not real impressive, it is a flat 6, so it should sound like a Porsche.
Andys
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sixnotfour
post Oct 5 2018, 01:22 PM
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obviously it'll need a turbo (IMG:style_emoticons/default/silver914.jpg)


https://www.engineswapdepot.com/?p=19545&
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76-914
post Oct 5 2018, 01:22 PM
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QUOTE(jd74914 @ Oct 5 2018, 10:12 AM) *

QUOTE(SirAndy @ Oct 5 2018, 01:07 AM) *

100 ftlb of torque at 8000rpm doesn't sound like fun in a 2000+ lbs car ...
(IMG:style_emoticons/default/wacko.gif)

It's all about tractive force, not engine torque. Geared correctly it's a much different picture. In any case, 300 hp @ 10k is 157 ft*lbs of engine torque so not too bad. Hypothetically [to equate to a traditional car engine] with gearing to bring the input engine speed into a conventional transmission back down to normal, you'd be the equivalent of a 314 ft*lb torque at the input shaft. Not too shabby.

Interested to see some progress! (IMG:style_emoticons/default/smile.gif)

I'd like to know more about tractive force vs. torque. Possibly we can see this explained in "layman's terms" for us non-engineer's. Maybe a different thread so as to not hi-jack this thread.
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sixnotfour
post Oct 5 2018, 01:25 PM
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obviously it'll need a turbo (IMG:style_emoticons/default/silver914.jpg)


https://www.engineswapdepot.com/?p=19545&
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