Esprit Electric ChargeCooler Pump

11 Апр 2014 | Author: | Комментарии к записи Esprit Electric ChargeCooler Pump отключены
Lotus Electric Cars

Electric Chargecooler Pump

Fed up with replacing your impeller, or just want to upgrade for reliability

This modification is a hot debate, basically the mechanical chargecooler pump works well, but needs servicing with new seals and impellor. This is costly and time consuming and pumps have been known to fail more regularly than the recommended service schedule. You’re unlikely to notice any failure, as it will be gradual as the impellor starts to break up.

Performance will fall and you’ll be none the wiser (unless you’re a regular on LEW) until you realise your Esprit isn’t as fast as everyone else’s.

How Do I Know If My Pump Is Broken?

Well, you don’t really know. If you go out for a longish journey, the charge-cooler case will be cool to touch. A more scientific approach is to connect a scantool such as that excellent FreeScan program 😉 and check what the MAT sensor is reading during a journey.

It should read not much more than ambient, approximately 5 to 10 degC more. Mine was reading 53 degC.

The best test is to go out for a run in the car and park it with the engine off. Wait 15 minutes and the charge-cooler will heat up (because it’s on top of the engine!). Connect FreeScan and you’ll see a reasonably high MAT reading.

Go out for a journey and after a few minutes, depending on your road speed, the MAT should start to reduce. If it does not, your charge-cooler pump is probably knackered.

An electrical pump takes away the maintenance and recurring costs, being more reliable and keeping your engine performing. The outlay for the new pump will soon be covered by the savings of not having to fork out for service kits for the mechanical pump (providing you keep your Esprit long enough) and the labour to take the pump out again. The electrical pump should out live the life of the car, in theory.


As for performance, well the electrical one will out perform a mechanical pump in need of attention or one that’s stopped working, as for matching a fully working one. That’s the hot debate. The Electrical pump will pump a constant flow from the moment you start it. The mechanical one works of the engine revs, turning half of the engine rpm.

So as the engine speeds up the flow increases and as the engine slows, so does the flow.

How this affects the performance of the chargecooler system isn’t overly clear. Both pump enough to keep everything safe and giving the performance intend. Some will believe the mechanical one is better, others that the electrical one gives the better performance. Here at LEW we don’t really want to get into a debate on this, we advise you to fit an electrical pump only once the mechanical one fails.

You’ll save in the long run, your Esprit will be more reliable and we believe that any difference isn’t going to be worth worrying about for 99% of owners.

We of course didn’t take our own advice and took out a perfectly good pump, which had only been repaired 3 years ago and was working great, just so we could bring you this guide. Was it worth it? Well we spend a weekend fitting it, lost skin off our knuckles and threw a few tantrams.

So WAS it worth it?

You can read more about the Lotus chargecooler system here

Lotus Electric Cars

We look around at the available pumps on the market and talk to a few owners who have fitting pumps to their Esprits. We ended up deciding on getting WC Engineering’s Pump (watch out for UK Import Duty, as this adds to the final cost) . Mainly for two reasons. WC’s pump is for sale to Esprit owners and isn’t sold by them for other purposes (so they’d hopefully done most of the hard work deciding on the best version).

They also supply the plug and bracket, which is an important part of the install. The pump seemed to cover everything including life, flow, size and price.

On receiving the pump, we contacted Lotus, who we then supplied the pump to. They OK’d the spec and worked out the best way to fit the new part and still comply to regulations if Lotus ever need to sell a version themselves. Looking towards the future, when parts for the old mechanical one may become unavailable.

Lotus supplied the following fitting guide and a wiring loom for installation, which is what you see below. LEW believes this is the best way to fit the pump and the best pump for 99% of owners.

Wiring Instructions

Lotus Cars recommended Electrical wiring installation for the addtion of an Electrically powered pump to replace mechanical driven chargecooler pumps.

The first step is to lenghten the plug wires that come with the pump connector. This should be done using ‘Splice’ crimps or making some of these from cutting some terminals in half. Crimp these securely, solder then apply heat shrink sleeving.

The plug and wires should now look like the middle picture above. Due to the high temperatures in the engine bay it is recommended that a high temperature sleeving is used to protect the wires. A grommet is required to allow the harness to pass through the RHS engine bay wall next to the air box filter.

All the other parts needed to complete the installation are shown above right.

With the parts the finished harness should look something like this. Except for the red over taped breakout which is for help with the routing later. The harnes above left is shown in the position it will sit in the car.

Lotus Electric Cars
Lotus Electric Cars
Lotus Electric Cars
Lotus Electric Cars
Lotus Electric Cars

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