Backwoods Supercharger

Turbos? Superchargers? Step this way...
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Re: Backwoods Supercharger

Post by warpc0il » Sat Jul 13, 2019 12:32 pm

Twin superchargers? ;)
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Re: Backwoods Supercharger

Post by Pensive » Sat Jul 13, 2019 12:48 pm

warpc0il wrote:Twin superchargers? ;)
There’s barely room for one!!!

Maybe you could use twin centrifugals on two different pulleys :D

But no. So now I’m trying to simplify the packaging.

I might mount it forward into the space where the air box is. The mount would be less challenging than a hymee gear system.

Or I could take the cost on the chin and just emulate the Pettit design and run a Kenne bell
Supercharger. 2.1l enough?? :D

Before I do all this does anyone know of any Pettit kits for sale?




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Re: Backwoods Supercharger

Post by qwakers » Sat Jul 13, 2019 2:15 pm

if you are going to do a SC kit, why not start from scratch with a charger that will actually work with the engine, rather than strangle it at the top end...

there was a thread on here about rotrex supercharges, id look at using one of those.

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Re: Backwoods Supercharger

Post by Pensive » Sat Jul 13, 2019 2:59 pm

qwakers wrote:
Sat Jul 13, 2019 2:15 pm
if you are going to do a SC kit, why not start from scratch with a charger that will actually work with the engine, rather than strangle it at the top end...

there was a thread on here about rotrex supercharges, id look at using one of those.
"Mazdatrix ran a Rotrex set up on their track car, but stopped after it kept cracking the housing where it was mounted to the engine. They are a great company, with years of rotary experience, who were happy to try a new thing out. Knightsport and Blitz in Japan both also did a similar centrifugal charger kit, and both were failures. Please note Mazdatrix kit was not for commercial sale, just for their own use, racing."

Hmm sounds a bit scary but also not necessarily related to the supercharger itself.

Hymee kits were problematic and need a few mods I read....
blitz renowned for killing engines.....
- think if im gonna do it i'll follow in the pettit footsteps TBH. They're known to be reliable.

That being said:

Before I go all custom - the cheapest route to boost (new) is this:
https://www.nengun.com/greddy/bolt-on-t ... ioaOowrPzU

Is that a greddy pattern part clone? Or old stock being used up? That plus shipping and import is much cheaper than i can possible design and build an SC kit
Last edited by Pensive on Sat Jul 13, 2019 3:01 pm, edited 1 time in total.

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Re: Backwoods Supercharger

Post by geofftl1000r » Sat Jul 13, 2019 3:00 pm

warpc0il wrote:
Sat Jul 13, 2019 12:32 pm
Twin superchargers? ;)
I think warpc0il was referring to the double post? :D
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Re: Backwoods Supercharger

Post by Pensive » Sat Jul 13, 2019 3:02 pm

geofftl1000r wrote:
Sat Jul 13, 2019 3:00 pm
warpc0il wrote:
Sat Jul 13, 2019 12:32 pm
Twin superchargers? ;)
I think warpc0il was referring to the double post? :D
Didnt spot that! :)

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Re: Backwoods Supercharger

Post by 350matt » Sat Jul 13, 2019 10:24 pm

I'd agree that a large positive displacement blower is the way to go
I don't see the point of fitting a centrifugal blower that only makes power at the top end when what is really required is some low-end grunt to round out the top end zing the engine already has
there's a reason why when an OEM fits a charger that they don't go the centrifugal route

best solution would be a 1320 TVS unit with a front entry like this
front entry charger.jpeg
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and I'd avoid a turbo on this engine there's a enough back pressure with the horrible exhaust port already

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Re: Backwoods Supercharger

Post by SprintRX8 » Fri Jul 31, 2020 11:24 pm

Did this ever get fitted or finished.
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Re: Backwoods Supercharger

Post by 350matt » Sat Aug 01, 2020 8:21 am

Jon has asked me to post up the following to close this one off
sadly it looks like it never did get completed


Jons' words:

just wanted to say thanks to everyone who provided their advice and help along the way, I’m really annoyed it didn’t happen but the timing was unfortunate and by the time I got back on my feet I had rather moved on to bigger things.

I’ve now sold my PZ so it’s fair to say I won’t be continuing the project any further; on the plus side I now have a 3 litre V6 with twin turbos so I got my boost in the end :)

Thanks again - there’s a great community in the rx8 owners club - maybe I’ll be back in a rotary one day....

Jon
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Re: Backwoods Supercharger

Post by SprintRX8 » Sat Aug 01, 2020 9:55 am

Cheers.

Just stumbled across this build and doing something similar with the 13B Sprint.

Did he sell everything off including supercharger and did he finalised the fitting and brackets.
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Re: Backwoods Supercharger

Post by geofftl1000r » Wed Aug 05, 2020 12:59 am

350matt wrote:
Sat Jul 13, 2019 10:24 pm
I'd agree that a large positive displacement blower is the way to go
I don't see the point of fitting a centrifugal blower that only makes power at the top end when what is really required is some low-end grunt to round out the top end zing the engine already has
there's a reason why when an OEM fits a charger that they don't go the centrifugal route

and I'd avoid a turbo on this engine there's a enough back pressure with the horrible exhaust port already
Not all manufacturer's use positive displacement chargers.
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Re: Backwoods Supercharger

Post by 350matt » Wed Aug 05, 2020 4:57 pm

[/quote]

Not all manufacturer's use positive displacement chargers.
[/quote]

no you're right horses for courses an all that
on a bike you don't really want the low-end grunt though do you, as that tends to spit you off the bike

so thats why I suspect Kawaski went the CF route

on a 1300kg car though its a different matter

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Re: Backwoods Supercharger

Post by geofftl1000r » Wed Aug 05, 2020 5:02 pm

1180KG seems ok though. So long as you have 2

https://en.wikipedia.org/wiki/Koenigsegg_CCR
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Re: Backwoods Supercharger

Post by 350matt » Wed Aug 05, 2020 5:11 pm

SprintRX8 wrote:
Sat Aug 01, 2020 9:55 am
Cheers.

Just stumbled across this build and doing something similar with the 13B Sprint.

Did he sell everything off including supercharger and did he finalised the fitting and brackets.

dunno

drop him a PM?
I dont' have any contact details I'm afraid

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Re: Backwoods Supercharger

Post by 350matt » Wed Aug 05, 2020 5:13 pm

geofftl1000r wrote:
Wed Aug 05, 2020 5:02 pm
1180KG seems ok though. So long as you have 2

https://en.wikipedia.org/wiki/Koenigsegg_CCR
yeah thats on a 5.0 ltr V8 so not short of low down torque in any guise

if you want ot bolt a CF charger on yours, you go for it chap
I'm going the positive displacement blower route on my install

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Re: Backwoods Supercharger

Post by geofftl1000r » Wed Aug 05, 2020 5:36 pm

350matt wrote:
Wed Aug 05, 2020 5:13 pm
geofftl1000r wrote:
Wed Aug 05, 2020 5:02 pm
1180KG seems ok though. So long as you have 2

https://en.wikipedia.org/wiki/Koenigsegg_CCR
yeah thats on a 5.0 ltr V8 so not short of low down torque in any guise

if you want ot bolt a CF charger on yours, you go for it chap
I'm going the positive displacement blower route on my install
I fear that with 70K+ miles on her, even an Ebay electric supercharger would be a bad idea. #-o
Always been a fan of the Roots style blowers since seeing them on old A series and B series engines.
Seems like a lot of negativity for something that's never been seen when you talk about CF chargers.
The fact a few have tried but then disappeared does appeal to me as we had so much fun with them on bikes.
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Re: Backwoods Supercharger

Post by 350matt » Wed Aug 05, 2020 8:02 pm

I've experienced CF chargers at work and I was less than impressed shall we say

you can get a better result with the right size PD blower or a turbo

And I don't fancy the turbo route on this engine

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