Lotus NA Yota tuning kit on the way

roadboy · Post by **roadboy** » Thu Nov 02, 2006 1:00 am

Right,

I don't have a dyno plot online yet but the good news is the fuelling is fine on the standard ECU.

With the 285 cams there are no gains to be had on the second cam but there is a big increase in torque between 4000 RPM and 6200 RPM.

Bad news: Cams are about £500 per pair.

It has come to my attention recently that a couple of S2 Exiges with 20k miles on them have developed nasty tappet noises and when investigated it has been found that the cam lobes have worn severely.

I am looking at one on Friday which has similar noises. These cars are all running standard cams so this is a very worrying development.

Dan@JPS

Gareth · Post by **Gareth** » Thu Nov 02, 2006 9:03 am

roadboy wrote:Right,

With the 285 cams there are no gains to be had on the second cam but there is a big increase in torque between 4000 RPM and 6200 RPM.

Dan@JPS

So, how will this effect performance if you get the ECU reflash.
For arguments sake, dropping the 2nd cam to 5200 RPM ?

Same explanation but just further down the revs?

roadboy wrote:
Bad news: Cams are about £500 per pair.

Post by ed » Thu Nov 02, 2006 9:49 am

dan could you let us know the outcome of the inspection re the worn cams, im sure my car was making those noises before it went in to see you but ive not been out in it much since then. Will double check tonight.

tut · Post by **tut** » Thu Nov 02, 2006 3:40 pm

They should have gone to Honda............

They should have gone to Honda............

Honda engines do it best, doo dah, doo dah

Toyo engines wear their cams, doo dah doo dah dey

tut

Post by ed » Thu Nov 02, 2006 3:44 pm

so true.....

SteveBanks · Post by **SteveBanks** » Thu Nov 02, 2006 4:24 pm

tut wrote:
Toyo engines wear their cams, doo dah doo dah dey

tut

Typical. This problem doesn't rear its ugly head until I buy a fcuk Toyota engine car, that's just run out of warranty yesterday and sounds kinda tappety (now amplified through paranoia). I'm sure I'm jinxed

Anyway, Tut:

Nana-na-nana...Honda cars fcuk up...err...Honda cars screw with...bugger...can't think of anything bad to say...hohum

jamie · Post by **jamie** » Thu Nov 02, 2006 4:38 pm

There is a very good thread on Exige.com in the S2 section including pics of the cams that are worn

Gareth · Post by **Gareth** » Fri Nov 10, 2006 11:10 am

Official Confirmation...

Lotus Sport T4 and T4e ECU â€“ 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.

Quite expensive for 500rpm
How much difference will that really make?

jj · Post by jj » Fri Nov 10, 2006 11:54 am

Wont know without driving.....

I know companies like Revo can give you a "5 hour" map to test and see if you like it. Would be cool if lotus could do the same. I did notice in that official line that there is no mention of the A and B spec ECUs being able / not able to be reflashed....

colin adams · Post by **colin adams** » Fri Nov 10, 2006 12:28 pm

How can I tell if I have a T4 or T4E ECU?? or would need to got he full hog??

colin

max1966 · Post by **max1966** » Fri Nov 10, 2006 12:41 pm

think its the '06 MY cars that have the 4e as they have electronic throttles

Post by ed » Fri Nov 10, 2006 12:47 pm

colin i think yours is a T4.

The most important bit is the code on the side. If it starts with an A then you need a new ecu, if its a b-spec then you will be ok to reflash. cheers Ed

jj · Post by jj » Fri Nov 10, 2006 12:48 pm

If it starts with an A then you need a new ecu, if its a b-spec then you will be ok to reflash.

The only place I have seen that said is on exiges.com . Like I said above, it doesnt mention that in the "official release" ? I wonder.....

Post by ed » Fri Nov 10, 2006 12:50 pm

think that came direct from plans,
B-specs i believe where introduced just before the end of the badges on the back.

SteveBanks · Post by **SteveBanks** » Fri Nov 10, 2006 2:02 pm

I have an earlier car so not checked but probably the original ECU, so close to 1K inc VAT to drop the cam 450rpm...err...I'm not going to bend over and take this one

Fcuking thieving barstewards