Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Bhp used by reverse gearbox?
limpetminer

posted on 16/11/16 at 09:10 AM Reply With Quote
Bhp used by reverse gearbox?

How much power does a quaife reverse gearbox use on a typical 1000 cc bec? been told its 30 bhp which seems like a lot.
View User's Profile View All Posts By User U2U Member
loggyboy

posted on 16/11/16 at 09:30 AM Reply With Quote
Would be percentage not an exact figure - ie if you put 30 bhp in it wouldnt give 0 out.

Website states its 'straight through' to minimise power loss. I suspect its a fairly minimal loss. So any major losses would only be when its in reverse.

[Edited on 16-11-16 by loggyboy]





Mistral Motorsport

View User's Profile View All Posts By User U2U Member
AdamR20

posted on 16/11/16 at 03:05 PM Reply With Quote
A friend of mine dynoed a 6bhp loss on an R1.
View User's Profile View All Posts By User U2U Member
loggyboy

posted on 16/11/16 at 03:38 PM Reply With Quote
quote:
Originally posted by AdamR20
A friend of mine dynoed a 6bhp loss on an R1.
]
What were the 2 max power figures?





Mistral Motorsport

View User's Profile View All Posts By User U2U Member
Andy B

posted on 16/11/16 at 04:14 PM Reply With Quote
In our experience you can expect between 6 and 12 bhp depending on the condition of the box. For some strange reason the box is direct drive in reverse which makes it far smoother and more efficient when going backwards.
Regards
Andy

View User's Profile Visit User's Homepage View All Posts By User U2U Member
loggyboy

posted on 16/11/16 at 04:46 PM Reply With Quote
quote:
Originally posted by Andy B
In our experience you can expect between 6 and 12 bhp depending on the condition of the box. For some strange reason the box is direct drive in reverse which makes it far smoother and more efficient when going backwards.
Regards
Andy


That contradicts there website - have they revised the design?
: https://shop.quaife.co.uk/quaife-reversing-box





Mistral Motorsport

View User's Profile View All Posts By User U2U Member
AdamR20

posted on 16/11/16 at 05:37 PM Reply With Quote
quote:
Originally posted by loggyboy
quote:
Originally posted by AdamR20
A friend of mine dynoed a 6bhp loss on an R1.
]
What were the 2 max power figures?


Not certain exactly, and if that was wheels or estimated fly, but I think it was a 2007 engine that had a few tweaks so was up around 180-190bhp or so.

View User's Profile View All Posts By User U2U Member
ReMan

posted on 16/11/16 at 07:01 PM Reply With Quote
Wow 30hp!
But even 6 sounds a lot!
Assuming the MNR is similar there's not a lot of resistance by hand. I'd expect to take some and worse so at higher revs, but 6 still seems a lot





www.plusnine.co.uk
∙،°. ˘Ô≈ôﺣ

View User's Profile Visit User's Homepage View All Posts By User U2U Member
loggyboy

posted on 16/11/16 at 07:59 PM Reply With Quote
quote:
Originally posted by ReMan
Wow 30hp!
But even 6 sounds a lot!
Assuming the MNR is similar there's not a lot of resistance by hand. I'd expect to take some and worse so at higher revs, but 6 still seems a lot

Its not just about resistance, although that is the root cause, as energy can never be lost, only transfered, things like heat and noise are where the energy 'goes'.





Mistral Motorsport

View User's Profile View All Posts By User U2U Member
MikeRJ

posted on 17/11/16 at 10:58 AM Reply With Quote
quote:
Originally posted by Andy B
For some strange reason the box is direct drive in reverse which makes it far smoother and more efficient when going backwards.
Regards
Andy


If it was direct drive, then the output shaft would not be reversed, literally by definition. Was this maybe a case of having the wrong diff or something and requiring a reverse to get forward motion?

View User's Profile View All Posts By User U2U Member
garyo

posted on 18/11/16 at 11:06 AM Reply With Quote
quote:

If it was direct drive, then the output shaft would not be reversed, literally by definition. Was this maybe a case of having the wrong diff or something and requiring a reverse to get forward motion?



A Jap engine spinning the wrong way??

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.