Katana runs rough when cold

[charliex]

Just in case anyone is interested in which modified emisisons standard the 06's have to meet, here is an intro doc
http://www.cleanair.org/Transportati...nCars/lev2.pdf

[JUNGLISTluder]

According to the timeline chart in the link you posted, 2005 and 2006 are both in the same phase (Tier II phase-in).

[charliex]

Yes indeed they are, its based on percentage of sales, when the cars are developed , future developments and getting a waiver from the governing body. Note the LEV II phase in is 2004-2006 and required 2006/2007, exactly when it did happen.

Lotus being a smaller manufacturer get waivers and they are allowed to get away with certain things for a while, but in this case it happened in the timeline

Heres some more info.
http://www.emitec.com/download/libra...04_01_1490.pdf

They could have added SAI to the car, but it'd have been more expensive and heavier a solution.

The DBW change was needed to do this.

[insane]

Originally Posted by JUNGLISTluder

I'm sorry, but I still don't understand. What are you leaving in and why does it cause my car to bog?

Sorry for being a pain, but I would like to understand why my car is doing this. Thanks!

There's nothing to fix. The ECU burns the fuel late to increase the egt until the cat warms up--thus reducing emissions more quickly.

It's working as designed--just more noticable in certain ambient conditions.

[Jean-Paul]

are you with manual throttle or electonic ?

[Jean-Paul]

Originally Posted by charliex

We set out to make the tune CARB compliant, and part of that is matching as close to the factory tunes as possible, the supercharger itself is not involved in the idle at all, so it doesn't need to be modified at that point. The 06 DBW cars definetely show it more aggressively than the 05's but there are some 05's that exhibit similar behaviour.

Modifying emissions equipment is one thing, removing it or defeating it all together is entirely a different kettle of fish.

It isn't something thats modified with the Katana, its stock from Lotus.

so for asking stupid questions...but can you let me know what does CARB stand for and DBW...(<---and this as well??)

[ZJChaser]

Originally Posted by Jean-Paul

so for asking stupid questions...but can you let me know what does CARB stand for and DBW...(<---and this as well??)

CARB = California Air Resources Board(strict air regulations)

DBW = DBW (06 Lotuses cars and newer)

[Darth G-F]

They all do that sir

[scottyb]

Charlie,

When I first did my install in Oct/Nov, she started right up and ran great even when cold.

Now I have exactly the same thing as these guys.

She starts right up, but will bug down until she' warmed up. Is there a way to reset the 06 Katana ECU back to the initial flash you gave us? I'm curious as to if this is something the ECU has learned.

[Matt in Houston]

Originally Posted by Darth G-F

They all do that sir

+1


Mine does the same thing and really its no big deal....takes just a few seconds to let it idle and I'm ready to roll. Besides, IMO its probably better for the car to wait just a few seconds and let the fluids flow around vs. just start and drive. Just consider it a built in safety feature of the kit...

[Scott]

Mine does it too. I usually let it sit idleing for a few minutes when I first start it cold. I have a stop sign about half a mile from my house that when I arrive and stop, the car ALMOST stalls. It actually stalled once, but I learned and am able to now keep it running. Once I leave the stop sign, it is now perfect and runs great. No big deal to me, I know its predictable and I can overcome for that brief moment.

[turbophil]

Just curious, did all you guys do the 15 minute "learn in" period after you got your ECU? i.e. start the car and elt it idle for 15 minutes forfore you touch the throttle? Mine bucked and burped when cold and stock, but after the Katana, it ran great- all that early stuff was gone...

-p

[JUNGLISTluder]

Originally Posted by turbophil

Just curious, did all you guys do the 15 minute "learn in" period after you got your ECU? i.e. start the car and elt it idle for 15 minutes forfore you touch the throttle? Mine bucked and burped when cold and stock, but after the Katana, it ran great- all that early stuff was gone...

-p

Yes, 15 minute idle period was performed.

[fpitas]

Originally Posted by turbophil

Just curious, did all you guys do the 15 minute "learn in" period after you got your ECU? i.e. start the car and elt it idle for 15 minutes forfore you touch the throttle? Mine bucked and burped when cold and stock, but after the Katana, it ran great- all that early stuff was gone...

-p

Yes. I've tried it many times. I've even tried disconnecting the battery for an hour and letting it learn again.

[turbophil]

Well, very good... I'm back to my original statement then.... DBW cars are no good and 05's should all see a bump in value from this thread

Cheers,

Phil

[scottyb]

Originally Posted by turbophil

Just curious, did all you guys do the 15 minute "learn in" period after you got your ECU? i.e. start the car and elt it idle for 15 minutes forfore you touch the throttle? Mine bucked and burped when cold and stock, but after the Katana, it ran great- all that early stuff was gone...

-p

But Phil what would explain my car? It was fine for a long time and then just suddenly started doing this?

[jheberle]

Originally Posted by Scott

I have a stop sign about half a mile from my house that when I arrive and stop, the car ALMOST stalls.

I've had this same issue with my N/A Elise. Like it is choking on itself for about 2-3 seconds, then back to a normal idle.

[beoswene]

So how do you perform the ecu reset for a DBW car??

[turbophil]

Scotty-

Perhaps whatever chi was left behind from your '05 that your '06 absorbed, finally disipated and it went back to its overly complicated DBW DNA---forcing it to cause problems that are difficult to diagnose due to a servo being attached to your throttle plate rather than a proper cable???

-or-

it may have something to do with what CW said; learning, atmosphere, etc. Since the 06 tune was originally set out for carb, and from what I understand, carb is hell bent on efficient cold start properties since the cat isn't warmed up for the first several minutes of operation, I think it's fair to say that the idle is probably super lean on your DBW red-headed step children, and it's just something you have to live with

I tend to gravitate to the former chi issue than the latter

Possible solutions: Remove your blowers and install in a "new 05" Elise and buy the orginal Katana flash- Sell your 06 without the blower. In for sale thread for old 06 that's now NA, say "Like new '06 Elise, Always babied, never driven hard. Needs good home"

-or- buy EFI, and say the heck with possible carb

Cheers,

P

[insane]

Originally Posted by scottyb

Charlie,

When I first did my install in Oct/Nov, she started right up and ran great even when cold.

Now I have exactly the same thing as these guys.

She starts right up, but will bug down until she' warmed up. Is there a way to reset the 06 Katana ECU back to the initial flash you gave us? I'm curious as to if this is something the ECU has learned.

Scotty, see post #44. ....it may just have been the cooler November air.