Interested to know what pulley sizes people are running on 440 cc (lotus 260) injectors .
I really can’t be bothered changing the injectors again but choosing a pulley (before a remap) is my next job …
jfk waits for inevitable Pesky driver training comment !
You really know how to start an epic thread !!! 
Remap on 440 injectors ??? 
They’ll all be screaming 90%+ duty cycle and need 550’s to be safe - I’ll get comfy for a nice long thread 
My 440cc were maxed out at 270 horses with the 4-1 manifold & remap.
The max pulley size you can go with 440cc injectors is 2.9" - that will get you 300bhp with the right bits. I calculated the injectors to be at 80% duty cycle. If you go for a 2.7" pulley, then you will need 550cc injectors.
Problem with the 260 ecu is they use different type of injectors to the gotham cars. If you go for custom tune with sincs, they you will have to change the injectors. Also kind a makes thes 260 ecu a bit redundant - best selling that and remapping the std 220 ecu.
I’ve still got it in a drawer for that very reason !
I’m still a tad confused about Sincs remapping … didn’t it used to be the case that the ecu needed to be sent to the States to be unlocked ?
I’m hearing now that this might not be the case ??
That hasn’t been the case for a long time, mine was done in a couple of days back in 2009.
Neil.
So if the 260 injectors have to come out anyway some 550,s might as well be fitted …
Hmm. That opens up the pulley choice considerably …
Project may have to wait a few months due to funds tho …
440s should be fine with the 2.9" pulley but they might be close with the duty cycle, it seems to depend very much engine to engine, to be safe use a 3" pulley and then all should be fine
probably a stupid question, but what is the standard size of a 240 pulley ?
3.28"
BS no doubt from rival companies pretending to offer mapping services.
Sincs have had the software onsite to do onsite mapping and flashing for the last few years.
I’ve still got it in a drawer for that very reason !
I’m still a tad confused about Sincs remapping … didn’t it used to be the case that the ecu needed to be sent to the States to be unlocked ?
I’m hearing now that this might not be the case ?? [/quote]
[quote=blacktoy]BS no doubt from rival companies pretending to offer mapping services.
Sincs have had the software onsite to do onsite mapping and flashing for the last few years.
I’ve still got it in a drawer for that very reason !
I’m still a tad confused about Sincs remapping … didn’t it used to be the case that the ecu needed to be sent to the States to be unlocked ?
I’m hearing now that this might not be the case ?? [/quote] [/quote]
The early ones had to be sent to the states to be ‘unlocked’, then the live mapping could be carried out at Sincs. Not sure whats changed since, but they may well be able to do it all onsite now.
In the early days they could do live mapping but then CharlieX had to “flash” the ECU from the US. That changed a long time ago and Sinc’s can map and flash on the fly now.
The last I knew the ECU had to go to a chap up north (friend of CharlieX) to be unlocked, not sure if sincs now do it themselves.
If you decide on the 550’s and a smaller pulley then go with the 2.8, it really is awesome. I have the harrop supercharger sitting in my garage but can’t really justify getting it fitted as TBH at 330 bhp the car is so eye wateringly quick it makes no sense to go for more power (yet!). My business partner has a tuned 911 turbo and my Exige keeps up with him. The biggest difference is the torque though, the engine feels much larger than a 1.8, on a damp road it will spin it’s will in 1st, 2nd and 3rd even with R1R’s on the back.
Of course you will run into other problems with this level of tune, Sincs will tell you to fit a chargecooler for added safety and you can count down the days until you kiss goodbye to your gearbox.
BTW - I have my previous, larger 2.9 pulley if you want it. Not sure what I paid Sincs but call it half what Sincs sell them for if you’re interested.
Been reading this Interesting pulley data [color:#000099] Clicky[/color]
Looks as though by fitting a smaller pulley this guy went richer …
I see no logic to it ,but it,s an interesting comparison he did …
Back in the early days Ade was running 440’s right up to 300bhp so I am not sure I understand all this maxing out at 270bhp…
I would rather stick with my Denzo injectors too as they are better quality than the RC ones Sincs supply.
I’m pretty sure Jim’s new 4-1 was the main reason why my injectors were running close to the limit. To gain 25whp (which it did) would mean increasing the fueling by alot when you think you normally gain 10bhp per PSI of boost with smaller pulleys.
I guess it depends on how your engine makes power with the modifications it has or how much boost/cooling it is running. I don’t think its as straight forward as X amount of horsepower = Y injectors. Sincs’s wouldn’t gain anything by telling me the injectors were at their limit. Wayne simply said my engine leaned out massively with the 4-1 and they had to increase fueling alot to compensate which is why it generated more power.
It is exactly a correlation between how much fuel you use and how much horsepower you make.
Engines are just big air pumps, the more efficient they are the more air they will process and therefore the more fuel they will need to make a given AFR to process the air.
If you are running softer cams, or not as efficient exhaust or inlet, or not running as much boost the engine will not be able to process as much air and will therefore not need as much fuel.
Could your top end slight leanness been the fuel pump running out of flow, therefore they needed to open the injectors right up to get the correct amount of fuel in at the slightly reduced flow rate that the pump was providing???
In all fairness when I was running 300hp on 440s we did not have the 550s to use, we were on the edge of what was sensible. I’m sure Sincs just build in some safety margin, they do not want to risk customers engine over a set of injectors.