Lowering cam changeover on VTEC/VVTI engines

merlin · 8 Sep 2006 at 09:22

eidolon said:
Yeah, looks like it'll make the car much nicer to drive.

It sure will.

Power band on mine is now 4,600 rpm long.

eidolon · 8 Sep 2006 at 10:18

My cam changeover is currently at 6200rpm but by dropping the changeover to 5500rpm means that I can get that quicksilver screaming for longer

To be honest though I don't mind the 6200rpm changeover, the Elise is such a light car it has instant throttle response so you never feel like you're hanging around waiting for that 2nd cam anyway.

Pug · 8 Sep 2006 at 11:20

they only feel less torquey below 6.2 because of the change in power you get over 6.2...

If it didnt have the 2nd cam and red lined at 7k you'd feel the engine was plenty pokey enough, but that sudden burst of power gives the impression of nothing below 6.2, which simply isnt true.

eidolon · 8 Sep 2006 at 12:14

Pug said:
If it didnt have the 2nd cam and red lined at 7k you'd feel the engine was plenty pokey enough, but that sudden burst of power gives the impression of nothing below 6.2, which simply isnt true.

That's what the 111S guys say too. They reckon that the 111R lacks power below 6200rpm but when you compare the S and R on a graph they're the same below 6200 but it's after that when the 111R goes mental and makes a load more power. It's that extra power that gives the illusion that it's gutless below 2nd cam when it's just not.

D4VE · 8 Sep 2006 at 12:34

merlin said:
Power band on mine is now 4,600 rpm long.

that's rather good

Pug · 8 Sep 2006 at 12:35

eidolon said:
That's what the 111S guys say too. They reckon that the 111R lacks power below 6200rpm but when you compare the S and R on a graph they're the same below 6200 but it's after that when the 111R goes mental and makes a load more power. It's that extra power that gives the illusion that it's gutless below 2nd cam when it's just not.

is the S a standard VVT-i then and the R a VVTL-i?

(ie 140 & 190 BHP?)

eidolon · 8 Sep 2006 at 12:49

Nope, the S is just a K series Rover but below 6200rpm the power and torque graphs are almost identical.

Zuban · 8 Sep 2006 at 12:55

eidolon said:
Nope, the S is just a K series Rover but below 6200rpm the power and torque graphs are almost identical.

I think thats changed/ in the process of changing and the S is now the toyota vvti 140bhp engine, just to confuse things

eidolon · 8 Sep 2006 at 13:14

Yeah, the new Elise S (replacing the 111S) is the Toyota engine. The Elise R replaces the 111R and has the "proper" screamer engine

MajinV · 8 Sep 2006 at 20:45

eidolon said:
Get a decent exhaust as your first mod, 2nd cam is boring with the standard peashooter.

Its been fitted with a Janspeed exhaust so hopefully it'll sound nice! Not as crazy as the Stage 2 that was in one i testdrove tough :eek:

eidolon · 8 Sep 2006 at 20:55

I find that my Quicksilver exhaust is pretty much how I want it, sporty up to 6200rpm but not intrusive, then it turns into a crazy axe wielding maniac after that.

Apparently the weather tomorrow is looking good so I'm goona fill up with Optimax and just drive until I'm empty again

eidolon · 9 Nov 2006 at 19:17

It's official now.

Lotus Sport T4 and T4e ECU – Track Optimised
Description
A Lotus ECU with the cam switch point optimised for track usage (switch point revised to 5750 from
6200 rpm). This allows the driver to maintain the use of the high-lift cams during track driving, whilst
avoiding unwanted switches to low-lift cams. All other functionality of the original ECU program is
retained, preserving the full European emissions compliance of the powertrain.
Applicable vehicles
Elise 111R Non Federal
Exige Non Federal
Features
Transition to high-lift cams at 5700 rpm (standard set at 6200 rpm)
Simplistic installation
Full retention of European emissions compliance
Part(s) supplied
Lotus T4 Manual ECU AL53M0215F
Lotus T4e Electronic Throttle ECU AL53M0244F
Prices:
T4 or T4e ECU with Program £795.00 + VAT
Program Only £395.00 + VAT (supply of ECU required)
For further information please contact your local Lotus Cars Dealer.

However I don't think I'll be paying LOTUS £795+VAT for a replacement ECU (the flash is only applicable to the later cars, mine's an 04

)
I'll wait until Emerald release a fully programmable ECU instead.

JediFragger · 9 Nov 2006 at 19:30

Glad there's a little progress for ya at least Steve :cool:

GT3 · 9 Nov 2006 at 19:48

eidolon said:
Yep, I post at Philz on every other board apart from this one. I guess I might change my nick on here someday just to confuse people

iirc you were philz on here years ago?

merlin · 9 Nov 2006 at 19:49

Are they having a laugh? That's hardly worth bothering with.

4250rpm is where you want the party to start.

eidolon · 9 Nov 2006 at 22:46

There's 2 types of ECU, I'm pretty sure mine is the unflashable one so it'll cost me £795+VAT if I want the new map.

If it turns out that mine is the other type then I think I'll get the remap otherwise I'll just wait until a proper ECU is released which might even increase the power too.

merlin · 9 Nov 2006 at 22:52

There's no aftermarket ECU's for the 111R yet?

eidolon · 9 Nov 2006 at 22:56

Nope, not yet. This is the only current option.

Some guys over in America appear to making good progress but there's nothing over here yet.

silversurfer · 10 Nov 2006 at 01:15

vtec movie
http://video.tinypic.com/player.php?v=3zgi2iw

eidolon · 13 Nov 2006 at 11:46

Checked my ECU last night and surprisingly enough it's the "A" version which means I can't reflash it, only replace it at a cost of £934

I've just emailed Emerald to see when their ECU replacement is gonna be ready, I've heard rumours that before Christmas is possible. I'd much rather spend £550 on an full replacement aftermarket ECU + rolling road time than give Lotus nearly a grand for a simple 500rpm change.