26 replies to this topic

[chickendippers]

Hi all,

 

I've been given a brand new Rotrex C38-91 and toying with the idea of using it on a build.

Any one have any experiences of these? Never really got involved with superchargers due to the lack of torque, however as it's not cost me anything it could be worth a punt.

 

Cheers

PK.

[The Batman]

Can you give it to me instead so I can fit it to my Honda

[chickendippers]

Can you give it to me instead so I can fit it to my Honda

 

£5?

[smiley]

due to the lack of torque

 

 

 

[Nev]

LOL, here we go...now the supercharged kidz will be all agitated with your slur!

 

Thats quite a big puffer (upto 500 HP) acording to the internet: https://jacksonracin...rcharger-units/

Edited by Nev, 26 April 2017 - 02:41 PM.

[chickendippers]

 

due to the lack of torque

 

 

 

 

Yes

[chickendippers]

LOL, here we go...now the supercharged kidz will be all agitated with your slur!

 

Thats quite a big puffer (upto 500 HP) acording to the internet: https://jacksonracin...rcharger-units/

 

I won't be able to hear them over the whining

I can't find much about them, other than on US forums, didn't know if anyone across here has had any experience with them

If it'll be too much of a ballache I'll just stick to my original plan

[The Batman]

*cough sell to batman cough* Been waiting for one to come up for sale on eBay for ages

[smiley]

Mark Verboom put in a C30 https://www.verboom....0419/index.html

But a 38 is a first i think.

[oakmere]

Mark has got Peters c30 rotrex which was good for over 300bhp on the 2.2. He had to fit a restrictor to keep power down before he upgraded the internals.

[smiley]

317 to be exact. (I was with him on the dyno day)

 

[oakmere]

Did he and Mark block the PCV in the manifold? If not the PCV will work in reverse.

[smiley]

Dunno. Both do not spend mucht time on the forums so info is limited.

[Nev]

 He had to fit a restrictor to keep power down before he upgraded the internals.

 

 

How come he didn't put a bigger pulley on, far more efficient surely?  

[Exmantaa]

A centrifugal SC has a bit exponential boost, so the torque keeps rising with revs. (And no torque at low rebs;you need a roots SC for that)

So to make some mid range torque, they tend to use a bigger centrifugal/smaller pulley, but then choke the inlet with a restrictor to pull some power at max revs...

 

 

 

[Rosssco]

A centrifugal SC has a bit exponential boost, so the torque keeps rising with revs. (And no torque at low rebs;you need a roots SC for that)

So to make some mid range torque, they tend to use a bigger centrifugal/smaller pulley, but then choke the inlet with a restrictor to pull some power at max revs...

 

 

 

 

I thought they might have had a BOV and boost controller - seems slightly more elegant (but obviously more complex) solution than an intake restrictor.  

[oakmere]

I think a well setup centrifugal SC would be the best forced induction setup for a VX / Elise. As the short wheelbase and mid mounted engine don't mix so well with lots of torque. I am not saying the fastest but just in keeping with the ethos of the car.

[Nev]

 

A centrifugal SC has a bit exponential boost, so the torque keeps rising with revs. (And no torque at low rebs;you need a roots SC for that)

So to make some mid range torque, they tend to use a bigger centrifugal/smaller pulley, but then choke the inlet with a restrictor to pull some power at max revs...

 

 

 

 

I thought they might have had a BOV and boost controller - seems slightly more elegant (but obviously more complex) solution than an intake restrictor.  

 

 

In his diagram, Mark Verboom does show that he has a BOV installed. I wonder why he didn't just set that to open at a lowish boost (whatever he wanted) and then boost would be limited and hence torque would be limited.  

Edited by Nev, 27 April 2017 - 12:20 PM.

[alanoo]

I kind of prefer the torque delivery of a Rotrex to a Eaton one on light cars.

Other benefit is they are much lighter too.

 

But I think I will never fit one to my cars as they are still may less reliable than roots ones.

[CHILL Gone DUTCH]

Hi all,

 

I've been given a brand new Rotrex C38-91 and toying with the idea of using it on a build.

Any one have any experiences of these? Never really got involved with superchargers due to the lack of torque, however as it's not cost me anything it could be worth a punt.

 

Cheers

PK.

what engine you sticking it on ?

cant think it will be a disappointment after  a stage 5 turbo  

Edited by CHILL Gone DUTCH, 27 April 2017 - 06:43 PM.