I’ve been looking at this graph and it seems to me that the 260 map is quite a bit more potent across the rev range both in power and torque with regards to delivery. This might sound like an obvious statement, but looking at the below powerchart, it’s clear that 220 and 240 cars are actually quite close in the power they produce and the 260 is quite a step above.
Power
On power, the 220 and 240 are very close up until about 5000rpm, when the 240 starts to make its extra power felt. However the 260 starts producing more power from as little as 3500rpm and that�s quite a difference!
Then from 4000rpm, the 260 just piles on the power and widens the gap. I was quite surprised at looking at this as I assumed that the 220, 240 and 260 would have equal gaps apart in power throughout the rev range. However the 220 and 240 are quite close until higher revs whereas the 260 makes its presence felt much earlier.
Torque
For me, this is where the biggest difference is. The gap between the 260 and the rest is quite frankly massive lower in the rev band. It seems to produce the same torque as the 240, but 1000rpm sooner. I know how urgent my 240pp feels at 4500 and 5000rpm and the 260 achieves the same torque at 3750rpm and 4400rpm respectably.
So where am I going with all of this? Well it got me thinking. All cars are meant to be 20bhp apart from each other, so why is the 260 so much more potent across the range? Surely it�s not just the map? If it is the map, I wonder why they don�t do something better with the 240 map.
Looking at this has just made me want to get the 260 tune even quicker. It does look like a lot of fun!!
The standard 220 map is actually restricted - from memory, the throttle never opens more then 85% fully open. The 240 cars take this restriction out of the map, and take full advantage of the engine. The difference between th 260 is actually a smaller pulley on the supercharger and map to suit. The smaller pulley has the chargeer spinning faster at much lower rpm, which is why they have more torque across the rev range.
[quote=jfk] on the pulley …
I have the cn 2-11 ecu and still run the standard pulley to achieve 277 bhp
Power comes in with an urgent rush @ 7000 rpm on mine ??
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Interesting…
I always thought the 260 cars ran a smaller pulley.
No the 260 is just a re map to get the most out of the engine. I have only ever driven a 240R which is slightly different to a PP but it did not feel much quicker than my 220S but the 260 with Forge intercooler is a LOT more urgent.
I have heard people say a 220S is not alot quicker than a 111R (I dont really agree tbh) however got a chance to stack my 260 up against my mates 111R and if I said I mullered him I would be being kind to the 111R, he then went out and bought a BWR supercharger (same as Katana) and I am still a good bit faster so he’s saving up for an intercooler.
I’m talking straight line jonny has a bigger wing and more carbon than i do. Plus I would need to give him something pretty to look at in his rear view tv.
My S2 111s was as quick around Anglesey as an Elise 111R. But quite a bit slower than an S1 Exige… therefore also an Exige ‘S’. However not a million miles slower as a vid I have when I was following an Exige ‘S’ at Silverstone shows.
When I had my S1 Exige, I was able to pass most Exige ‘S’ 220’s but not the 240’s! And now that I have an Exige ‘S’ I am give or take the same time around a cct as a 200 BHP S1 Exige!
When I had a pax ride in Ade’s 300 BHP? Exige ‘S’, it felt about the same as mine at low to med RPM, but there was a BIG difference as the RPM got above 4,500 ish. NICE! That seems to be bourne out by the Dyno plot as shown above!
The moral of the story… IF the Toyota gearbox did not have the ‘issues’ it DOES seem to have with the higher power outputs, I would be off to CN’s to have the 260 ‘upgrade’ (no smaller pulley included). But as it is, my standard car is just fine!
To go any faster, I will need to work on my driving skills 9or lack of them) and would also love to loose some weight off it (and me!) as I reckon that would make a big diference overall… as Captain Carbon would agree with!
Pete, (I’m touching wood now) I think the 260 should just about be safe with the gear box so long as the car does not live on a track.
I think track comparisons are always difficult because driver skill and entry/exit speeds make a huge difference unless you are talking about masses more power.
Having driven a 190bhp S1 and owning a 220S I felt the 220S was a little quicker due to the extra torque low down but that would not make much difference on a circuit
The difference between the 220 & 240 is the throttle opening as already stated (ECU map). The difference between the 240 and 260 is uprated injectors & fuel pump. Not sure the 260 has a smaller pulley???
Torque wise Peak on the 220 is 159lb/ft, 240 is 169/lb/ft & 260 is 179lb/ft although the 260 numbers seem to be conservative.
The 260 runs the same injectors as the 240. The 220 has limited throttle opening and the UK cars run the same injectors as the NA cars, the 240 has full throttle opening and uprated 440 denzo injectors and the 260 is a remap. Lotus also install the uprated pump to the 260, however I ran without one until this week without any problems.
I was thinking of having an upgrade done, I got a 220S, is it not worth going the 240 route and going straight to 260?
Would I only need the injectors, map and fuel pump?
If so how much do you think? I was quoted around �1400 for 240 but that didnt include the fuel pump. Ive heard you need a brake upgrade for 260 though…
Upgrade can range from a simple hose and pad upgrade to bigger discs or a full front brake upgrade with a number available see the one from AP caparo or Lotus Sport Big Brake Kit.
[quote=DrTroy]I was thinking of having an upgrade done, I got a 220S, is it not worth going the 240 route and going straight to 260?
Would I only need the injectors, map and fuel pump?
If so how much do you think? I was quoted around �1400 for 240 but that didnt include the fuel pump. Ive heard you need a brake upgrade for 260 though…
Ok suppose I better chime in.
220S car 330cc injectors 65% throttle opening
240PP car 440cc injectors 85% throttle opening
260Map car 440cc injectors 100% throttle opening new pump is sensible but not required (when the pump is old it might go lean at the top end)
270Map 2-11 car 440cc injectors 100% throttle opening bigger pump 3.1" (estimated) pulley (standard 3.228") exhaust?
Cars like mine 300hp ish 550cc injectors 100% throttle opening bigger pump 2.9" pulley charge cooler 4-1 exhaust manifold and straight through system.
[quote=ade]Ok suppose I better chime in.
220S car 330cc injectors 65% throttle opening
240PP car 440cc injectors 85% throttle opening
260Map car 440cc injectors 100% throttle opening new pump is sensible but not required (when the pump is old it might go lean at the top end)
270Map 2-11 car 440cc injectors 100% throttle opening bigger pump 3.1" (estimated) pulley (standard 3.228") exhaust?
Cars like mine 300hp ish 550cc injectors 100% throttle opening bigger pump 2.9" pulley charge cooler 4-1 exhaust manifold and straight through system.
Does that make sense to all?
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I thought the standard pulley was 3.28".
The 260 figures are good going though for so little involved.
Well actually I did miss out the better quality intercooler on the 260 which does make quite a difference, but it does show the original Gotham done by Sincs was pretty good for a remap to get full throttle etc and it made around 250-255hp, it just showed Lotus were crooks holding back the standard cars
jonny has a bigger wing and more carbon than i do. Plus I would need to give him something pretty to look at in his rear view tv.