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WOSP Starter Motor Install, 3x the torque and 1/3 the size and weight  Rate Topic 
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 Posted: 03-17-2020 05:59 am
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discogodfather
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WOSP is a UK firm that does modern Denso based starters for British classics. Saw them from an ebay reseller and decided to give it a chance as my old starter was fizzing out and struggled to give me 400 rpm.

The unit is very nice, all aluminum, and comes in at less than half the weight and size of the original. It also has a very unique mounting position option where you can literally clock it in any direction (rotation) you want. The stock location it came with was already perfect.

This was advertised to work on the JH and all Lotus 907's. Easiest install ever but I was confused as to where to hook up the "cold start booster" wire. I emailed WOSP and they got back to me within hours on a weekend and said that it wasn't necessary to hook it up, especially with the high energy low resistance coil I am using with the custom 43D I had modified. Starts right up, high rpm's and draws less than half the amps. Really smooth starts now with no excuses. I used to pray the Lucas unit would work on cold mornings.

The Denso motor is so smooth it makes the engine sound like a modern car for a second when its cranking. Super quiet too. This has to be the single best upgrade I have done since resurrecting her from a 12 year hiatus.

Fewer wires in nice too, it just needs switched 12v in and your done. Pricey at $350 but it's well worth it. Just for the weight savings and size savings alone. I can easily get an oil filter wrench behind the filter now.



Luke at WOSP answered all my questions quickly. He said if I wanted a newer unit, they had incorporated a cold start hookup into their newer models. I would just order directly from them next time.




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 Posted: 03-20-2020 09:12 am
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mtechwim
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That looks like a very nice upgrade indeed.

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 Posted: 03-20-2020 11:07 pm
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Tom Bradley
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Very nice. The price is a bit painful though. I notice that the price is considerably higher than WOSP starters for other British cars like the TR's. Lower volumes, maybe?

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 Posted: 03-23-2020 01:15 am
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discogodfather
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Tom Bradley wrote:
Very nice. The price is a bit painful though. I notice that the price is considerably higher than WOSP starters for other British cars like the TR's. Lower volumes, maybe?

I bet, especially because it's got this CNC machined aluminum plate that allows mounting in a variety of different positions. Just unbolt the plate and you can adjust it in many positions at about 10 degree increments for 360 degrees.

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 Posted: 04-21-2020 06:56 am
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nrb993
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Thank you so much for advising as my starter is on its last legs.

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 Posted: 04-21-2020 07:02 am
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nrb993
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Hi - Please may I ask, what is the cold start wire and how does it work, I am not sure I understand. I can see a wire to the Tachometer called a Eureka Resistance wire, is this the wire please.

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 Posted: 04-21-2020 07:19 am
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discogodfather
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nrb993 wrote:
Hi - Please may I ask, what is the cold start wire and how does it work, I am not sure I understand. I can see a wire to the Tachometer called a Eureka Resistance wire, is this the wire please.

No, the cold start circuit is a dedicated wire, white with yellow stripe, that runs from the starter to the coil. The idea is that during cold starts, it boosts some power into the coil. It's not necessary on the WOSP since it draws so few amps anyway and is much more efficient.

WOSP used to supply their units for the Lotus 907 with a seperate wire with a diode on it to prevent any power backfeeding into the coil circuit, but that was the older units. Now they offer a unit that has a terminal and you can just connect that, if you want.

So far my older unit is functioning perfectly well without the circuit at all. Even if I had the newer unit I probably would not hook up the circuit.

Highlighted in red, from the factory electrical diagram:

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 Posted: 04-21-2020 05:10 pm
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Esprit2
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Most ignition systems include a ballast resistor prior to the coil. If 12 volts is 'nominal', the resistor will drop the voltage delivered to the coil down to about 6 or 7 volts for normal running.

Then the starter-mounted solenoid has one extra small terminal. When the solenoid is energized, it turns power 'On' to the starter motor, and also 'On' to that extra spade terminal. A wire goes from that terminal directly to the coil's (+) input terminal, bypassing the ballast resistor and delivering a full 12 volts to the coil. That way the coil puts out a hotter spark only while the engine is being started. As soon as the key is released from the "Start" position, that bypass circuit turns off, and the coil goes back to running on reduced voltage via the ballast resistor. The whole purpose is to provide a hotter spark during start-up, and the bypass circuit is 'Off' all the rest of the time.

In Lotus cars, the wire from the ignition switch to the starter solenoid that 'tells' the starter to run is is White with a Red stripe (WR). The wire on the solenoid's second small terminal is output for the resistor bypass wire from the starter solenoid direct to the coil, and it's White with a Yellow stripe (WY).

From the ignitiion switch to the coil, the full 12V wire is White (no stripe) as far as the ballast resistor. From the ballast resistor to the coil, the reduced voltate wire is White with a Yellow stripe (WY). So at the coil's (+) input terminal, there will be two WY wires attached. One from the ballast resistor with reduced voltage for normal running, and one from the starter solenoid with full system voltage for starting only.

The wire and stripe colors follow a standard code. If you figure out the White, White-Yellow and White-Red wires in your J-H, you should find that the similar wires in a Lotus/ MG/ Triumph look pretty familiar.

Regards,
Tim Engel

Last edited on 04-21-2020 05:40 pm by Esprit2

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 Posted: 04-21-2020 08:14 pm
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nrb993
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Thank you so much, I have spoken to WOSP, they replied within 10 minutes, the starter is available for £229 including postage, this is $282. Not bad I think

cheers
Neil

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 Posted: 04-21-2020 09:33 pm
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Esprit2
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Not to take anything away from WOSP, but Gustafson Specialty Products make a similar product by modifying Nippondenso geared starters to fit a variety of Britcars and other specialty cars (Ferrari, etc). The owner is also a Lotus owner and considers himself 'one of us'. Gustafson starters are available from JAE and Dave Bean Engineering, and it wouldn't surprise me if Delta Motorsports carried them. They're not cheap either, but as long as your shopping in that price range, why not check them out as well. The following link should open to Gustafson's 'dealers' page:

http://gustafsonspecialty.com/welcome2.html

I've installed Gustafson starters in 4 different Britcars (okay... Lotus), and give them a hearty thumbs up.

Regards,
Tim Engel

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 Posted: 04-21-2020 11:34 pm
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discogodfather
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If I had known about Gustafson I probably would have gone that route, especially here in the States. They look almost identical.

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