free hit
counters
Supercharger Pulley - Engine & Ancillaries/Gearbox - The Lotus Forums #ForTheOwners Jump to content


Supercharger Pulley


Recommended Posts

How easy/difficult is it to change the pulley on a standard supercharger?

Can you just swap out the pulley or do you need a whole new nose for the supercharger?

Seems like a nose job might be required:

https://www.monkeywrenchracing.com/product/lotus-evora-s-boost-up-kit-supercharger-nose-and-pulley/

Link to comment
Share on other sites


Upgrade today to remove Google ads and support TLF.
32 minutes ago, Bravo73 said:

Bear in mind that: different pulley size = different belt size. 

When I had my 460 upgrade I kept the original belt. This is because Komotec sell a modified pulley and idler so you keep the standard belt. The 380 cars have a different nose pulley than the 350 so that wasn’t changed.

cheers

PS When H111 do a 460 they send the supercharger back to Komotec to have the pulley changed (at least they used to), so it cant be that straight forward.

Link to comment
Share on other sites

8 hours ago, mik said:

As they sell pulleys separately - I guess you only need a pulley?

They do sell the pulleys separately but say:

One pulley, fits MWR boost-up supercharger nose (required)

 

7 hours ago, Mark030358 said:

When I had my 460 upgrade I kept the original belt. This is because Komotec sell a modified pulley and idler so you keep the standard belt. The 380 cars have a different nose pulley than the 350 so that wasn’t changed.

cheers

PS When H111 do a 460 they send the supercharger back to Komotec to have the pulley changed (at least they used to), so it cant be that straight forward.

Hmmm that suggests to me that you would definitely have to change the nose of the 350 supercharger. Lotus obviously do it themselves to fit the smaller pulley on the 380.

7 hours ago, Bravo73 said:

Bear in mind that: different pulley size = different belt size. 

Yes, although I understand that if the pulley is only a little smaller then you can keep the same belt and the various idle wheels take up the slack

Edited by Mattmahope
Link to comment
Share on other sites

Anyone know what size the standard pulley is (70mm?) and what size the 380 pulley is?

What size pulley does Komotec use for their kits? I assume they use the same size for all their kits from 390 up to 460, right?

Link to comment
Share on other sites

Can'

39 minutes ago, Mattmahope said:

They do sell the pulleys separately but say:

One pulley, fits MWR boost-up supercharger nose (required)

 

Hmmm that suggests to me that you would definitely have to change the nose of the 350 supercharger. Lotus obviously do it themselves to fit the smaller pulley on the 380.

Yes, although I understand that if the pulley is only a little smaller then you can keep the same belt and the various idle wheels take up the slack

Cant help on the size. I'm away at the moment. Check out Deroure for part number differences, maybe it shows a nose or a pulley?

cheers

By the way, just done a large trip aound the Alps and back and the KT install has been perfect. Only niggle I have is the cold start in a morning, car needs to run for a minute or s to clear its throat (so to speak).

  • Like 1
Link to comment
Share on other sites

The original pulley is 69 mm. As mentioned, the "380" pulley is 65 mm. To fit any of the 66, 62, or 58,5 mm pulleys from MWR, you need to change the complete super charger nose (The transmission). Track-Group says they have a solution to provide a 67 mm pulley without changing the "nose". I believe it is by far the most cost efficient of those updgrades, but also the most modest upgrade (~10 hp).

All these alternatives stays well within the supercharger map in terms of both speed and boost and actually the higher boost is generated at a higher efficiency since you move into a more favourable area in the compressor map. It is only the most extreme MWR wheel that brings the compressor out of the sweet spot again.

With this said I do not mean it generally is safer to operate the engine with higher boost, generating more power.

  • Like 1
Link to comment
Share on other sites

  • 6 months later...

The suppliers of these upgrades claims you can handle the 66 and 67 mm upgrades with the original ECU map. If you look in the compressor diagram, the increased supercharger speed doesn't affect the efficiency much, not until you go to the 62 mm, or smaller, wheel and approach the rev limiter. You actually gain some efficiency at slightly higher boost, which compensates for some of the extra load. Theoretically the temperature increase at max rpm is only 7 °C, not accounted for the additional 4 hp the engine need to produce to drive the supercharger.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...