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 Post subject: rotrex C15-60 supercharger + stock g13b
PostPosted: Wed May 30, 2018 9:25 pm 
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Joined: Fri Feb 10, 2017 6:25 pm
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Location: Brussels
OK avoiding the hole turbo is cheaper debate, I considering fitting a rotrex C15-60 to a standard G13B (from a '94 with 96k on the clock) if space allows (it's going in a mini, space is tight).

Before I get practical with printing a 3D model of the rotrex to evaluate clearance, I've been pondering rational about reliability on the engine side of things.

What comes to mind is forced induction is the same whether turbo or supercharger, just the delivery is different (supercharger is more progressive, turbo is whack! in your face, internals).

Apart from retarding the ignition as you go up in the rev range, what other implications do you guys foresee with this kind of setup, on a stock motor, along with the various theories below?

- With a power progressive stress increase, what, if applicable, differs from a turbo setup?
- High compression is also a bit worrysome, drop it or can you reasonably get away from stock?
- What happens when you hit the redline under forced induction on stock config (boom?)?
- Obviously standard ECU would not be up to the job
- Stock internals will be under high stress, can they take it (would like to get a definitive answer vs all the variation that is thrown about on the forum - general figure seems to be 180hp, but N/A and turbo strain the engine differently)?

I know it's been done successfully before way back in 2004 by some guy on another forum (can't for the life of me find that thread again), supposedly on a stock motor. The aim is around 150bhp, driveability and reliability, not full on racing

Express yourselves (reasonably :) )

Cheers
S.


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 Post subject: Re: rotrex C15-60 supercharger + stock g13b
PostPosted: Sun Jun 03, 2018 1:14 pm 
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Joined: Mon Oct 12, 2015 11:30 am
Posts: 384
Location: Napier
Had to google what that Supercharger unit was, half a turbo :D

Mounting it might be easy enough as you are not limited to the location like you are for a normal supercharger unit.
Use cardboard for your model, faster and cheaper. (unless you want to put in the hours and geek out)

Nothing comes to mind that is different regarding stress increase in the difference between supercharger and turbo setups.

It has been proven on here and other forums many times that the stock G13b engine will handle 5-10psi well enough as a daily driver. Providing it is driven appropriately.

Compression needs to be dropped, usually to around 8.5:1

Hitting redline? You should be shifting before then son! No boom, just don't do it.

Aftermarket ECU would be best but there are piggyback systems you can use for spark and fuel timing.

There was a thread on Teamswift about a guy who has a mini that was considering a supercharger but it was an AMR500 unit.
Some searching revealed these threads:
https://web.archive.org/web/20171013133 ... a55cf14916
http://buggynews.com/supercharging-the- ... 91-80.html

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 Post subject: Re: rotrex C15-60 supercharger + stock g13b
PostPosted: Sun Jun 03, 2018 4:08 pm 
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Joined: Sat Aug 15, 2009 3:59 pm
Posts: 401
Location: Hamilton NZ
Im running a rotrex with a highly modded g16 running 12.5 to 1 compression ratio @ 10psi peak. Because of the progressive boost curve running on stock internals and compression ratio should not be an issue with a tune and moderate boost. If you search blake cultus here on redline you can see some images. The rotrex is mounted low on the firewall side.

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 Post subject: Re: rotrex C15-60 supercharger + stock g13b
PostPosted: Sun Jun 03, 2018 7:45 pm 
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Howsie13 wrote:
Mounting it might be easy enough as you are not limited to the location like you are for a normal supercharger unit.


You're still limited to the axis of the engine pulleys, it's just that a rotrex is a bit smaller than a roots blower so there's a few more options for placement. ;)

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 Post subject: Re: rotrex C15-60 supercharger + stock g13b
PostPosted: Sun Jun 03, 2018 8:14 pm 
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Joined: Mon Oct 12, 2015 11:30 am
Posts: 384
Location: Napier
[YLD80Y] wrote:
Howsie13 wrote:
Mounting it might be easy enough as you are not limited to the location like you are for a normal supercharger unit.


You're still limited to the axis of the engine pulleys, it's just that a rotrex is a bit smaller than a roots blower so there's a few more options for placement. ;)


True that :D

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