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Evora 400 Supercharger actuator not working


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I recently noticed the actuator on my 400 wasn’t moving, however performance doesn’t feel affected (maybe one hesitation as I opened the throttle). Had a quick look and it seemed stuck, I gave it a wiggle and it seemed to free itself and has been ok for a few days. It’s happened again and it won’t move this time.

So some questions to those more knowledgeable, as the car is my daily driver is there a possibility that by continuing to drive it this may result in harm to the engine/supercharger, I’m thinking unlikely as it doesn’t seem to drive any differently. Would the solution be just to replace or maybe something more simple ?

Obviously I’ll be getting it sorted asap, the cost from lotus is around £300 ish, are there any alternatives available without having to buy from lotus ? I’d rather go to a specialist than be overcharged by a dealer, I’m located near the Lake District in Cumbria so can anyone recommend a specialist within a reasonable travelling distance please ? Dealers are 2 hours away so a bit further won’t be an issue.

Apologies for all the questions but this is my first car with forced induction.

Cheers,

Phill

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Sorry didn't see this one first time round.

The 'actuator' you can see in the rear window is actually the bypass valve.  This opens when the engine is producing producing vacuum (idle and light throttle), to bleed off the boost created by the charger (spinning all the time driven by engine). If this is sticking shut, then the car will be running more boost than it wants at idle and light throttle, and therefore theoretically running lean.  The ECU will be attempting to compensate like mad by chucking fuel in.

The bypass valve is on a spindle that you'll see disappear into the charger.  There is a vacuum actuator attached to it - this is the round pot thing you can see with an arm on it, attached to the bypass spindle.

The vacuum actuator should be connected to the charger via a small hose, check that this is present and intact.  If you disconnect the actuator arm, you can double-check that the spindle is free moving (engine off!).  If you apply a vacuum to the hose, the actuator should open the bypass, and hold it open without a continuous vacuum.  If it returns to closed with non-continuous vacuum applied, then the actuator diaphragm has failed.

We may well have an actuator in stock, I can check tomorrow.

Dave

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Thanks very much Dave for your explanation and this would explain why I don’t feel a drop in performance. If it wasn’t visible then you’d not know.
 

If I need a new one it would be good to know if you have any.

 

Cheers,

Phill

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Hi Phill.

Unfortunately we don't have the 400 type actuator in stock.  And the price is slightly eye-watering at £233+VAT!

A bit of diagnostics should establish whether you need one.

Dave

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So an update, after some investigation I found the spindle that goes into the charger was actually sticking, carefully squirted some WD40 where it goes in and wiggled around quite a bit and it now appears to be working ok.

I’ll keep an eye on it now.

@Dave is this something you have seen before on SC models or an isolated issue ?
 

Thanks,

Phill

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Posted (edited)

No not garaged but no sign of corrosion on spindle though, hopefully it’s sorted it (fingers and toes crossed), if it has sorted it then it was one of the quickest and cheapest fixes ever 🤪🤪😎

Edited by Phillv6
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Great result, may be a little oil on the spindle is a maintenance tip for those who don't garage their cars..

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