In case you run out of popcorn on JFK’s new thread, I thought this one could run alongside!
CN’s insist on the uprated fuel pump when they do the 220 to 260 upgrade… using 440 cc injectors. Yet Sincs are quite happy that this is not required unless you are going past 280 or so…
Sits down. 
Your fine with the standard pump at 260bhp. My car ran the std pump at 300bhp (dyno’d at sincs) for 2 years - It was only the last 200rpm before the limiter is started to run a little lean, even then it was not exactly an issue.
I’d consider changing it when your looking ar around 280bhp.
Side tracking slightly - does anyone know if the vx220 fuel pump is compatible with Lotus?
Pete you suprise me!!!
Safety first and all that.
Not tried it but the standard pump may be ok as Sincs say, but
with the AFR thread etc then the uprated pump can only be a good thing.
It doesnt increase pressure as that is controled by the pressure relief valve, Just flows more, well as I understand it anyway.
Puts flack jacket and hard hat on
I agree with the above, however with age the standard pump will start to flag a little, I would certainly not go past 280hp with the standard one, mine was fine one month with 300hp, the next month it wasn’t 
When you change it there is also no need for remaps or anything 
Cool! That saves some bucks and I feel like I am zoning in on a pathway to go now!!!
SAFE too!
I have 260hp+ with the standard pump and Gotham tune , they told me thats as far as they would go before i changed the injectors and pump to be on the safe side.
You not waiting for the Emerald ECU?
[quote=moomin]I have 260hp+ with the standard pump and Gotham tune , they told me thats as far as they would go before i changed the injectors and pump to be on the safe side.
You not waiting for the Emerald ECU? [/quote]
… maybe!
Sinc’s have probably mapped well over a hundred Toyota cars in the last few years not to mention their own Honda & Duratec conversions. Yes they may have a monopoly on doing custom ECU maps without needing a piggy back or replacement ECU but you can’t really ignore what’ve they’ve done or achieved with tuning yota engines.
[quote=blacktoy]Sinc’s have probably mapped well over a hundred Toyota cars in the last few years not to mention their own Honda & Duratec conversions. Yes they may have a monopoly on doing custom ECU maps without needing a piggy back or replacement ECU but you can’t really ignore what’ve they’ve done or achieved with tuning yota engines.
[/quote]
And mine was the first they did, exciting times back then
Changed that for you Ade 
Pete, my car ran for twelve months without the uprated pump however Lotus insist CN’s fit the uprated pump and would not allow them to do the upgrade with out it.
I agree with Dave, why run the risk?
It is a cheap upgrade and you can do it yourself to save some cash, you can leave it but in the long run I wouldn’t
Change out the pump or look into the surge tank and pump combo from guys like Radium or make your own…
The std pump is okay for 260bhp. You can fit a walbro for cheap, but its noisy, and also not a 2 stage pump like the oem so you are running the risk of fuel starvation - Really need a swirl pot if running the walbro.
I’ve got the usual highflow 260 pump (which isn’t cheap), but if I was doing it again I would leave the std pump and just fit an external swirl pot with a secondary pump (like the honda cars).
How does the standard pump keep up with a better pump in a swirl pot , won’t the swirl pot empty faster than the standard pump can fill it ?
Nah…the std pump is ony running at 100% efficiency for the last 200rpm in a 300bhp car. Its oonly really struggling for probably around second (always looks worse on a dyno) A swirlpot has about a 1.5 litre resverve and is soon topped up again by the std pump when not running at max rpm.
Randy was running std pump with a seoncdary pump and swirl pot in his europa at 420bhp.
[quote=N17VES]The std pump is okay for 260bhp. You can fit a walbro for cheap, but its noisy, and also not a 2 stage pump like the oem so you are running the risk of fuel starvation - Really need a swirl pot if running the walbro.
I’ve got the usual highflow 260 pump (which isn’t cheap), but if I was doing it again I would leave the std pump and just fit an external swirl pot with a secondary pump (like the honda cars). [/quote]
Which sec pump and swirl pot would you recommend?
The surge tank (as we refer to it in the states is a different beast than a swirl pot, FWIW) has a return system that directs unused fuel from the regulator or rail back to the surge tank to prevent pumping the gas back to the tank unless it’s not needed (overflow). In that case, there is an overflow line from the surge tank that goes to the fuel tank. The surge tank is obviously continuously fed by the stock intank pump. The reason the stock pump can “keep up” is because it’s not pumping at any appreciable pressure. Pressure and volume are inverse related here. The stock pump will pump LOTS of volume when not under pressure. Way more than a 400bhp 2ZZ needs. Because it’s not under pressure, it’s also under less load so it runs cooler and lasts longer.
The pressurized fuel is pumped by the 255lph pump that’s inside the surge tank and then regulated. You need an adjustable regulator in this scenario to ensure the extra capacity can be fine tuned for your specific flash. Tpyically, setting the FPR to 47 psi is about perfect. Using a scanner and monitoring your trims will help to perfect it the FP.
A Swirl pot would operate under a similar strategy. However a swirl pot uses an external pump. The reason they’re called swirl pots is because of the orientation of the supply fitting creating a swirling action in the “pot” and the outlet being centered at the bottom of the tank…
The end result is the same- zero fuel starve.
To my knowledge, nobody is making a swirl pot for the Lotus. The packaging would be difficult with our cars. I believe we were the first to market a surge tank designed bespoke for the lotus a couple years ago and have nearly 200 of them all across the globe with great results. It’s complete with all the fittings, FPR, etc…
You can see pics on our website at BOE Fabrication.com in the products section and additional installation pictures in our “tech wiki”.
Hope that helps,
Phil
Two post and this chump is tryin to sell his crap here now…
[quote=Fran�ois][quote=N17VES]The std pump is okay for 260bhp. You can fit a walbro for cheap, but its noisy, and also not a 2 stage pump like the oem so you are running the risk of fuel starvation - Really need a swirl pot if running the walbro.
I’ve got the usual highflow 260 pump (which isn’t cheap), but if I was doing it again I would leave the std pump and just fit an external swirl pot with a secondary pump (like the honda cars). [/quote]
Which sec pump and swirl pot would you recommend? [/quote]
I know a few people using the Bosch 044, but the Walbro would do.
Any swirl pot should do…quick look on ebay brings up this
I’m no expert, but Hoffmans will be able to supply a kit - They may even be able to give you advice if you are to buy the bits.