2nd stage remap?
Discussion
i know its possible to remap the ecu on the toyota powered cars so that the cam switch happens earlier (aka the supercharged cars), but has anyone done this to there naturally aspirated car? swapping over at 5k may make a big difference to the driveability?
>> Edited by swilding on Saturday 18th February 19:24
>> Edited by swilding on Saturday 18th February 19:24
As nobody answers I might help.
From the lotuscars forum and according to lotus itself, the change at 6200 is the more efficient.
it use the torque of the first came at low-medium revs and the power at high rev of the second.
they see this as 2 engines with their own power curve. 6200 is seen as the best trade for both.
If you lower the treshold, you end up with less torque on second came (peaky engine)
I just repeat what I have red and can't comment it myself, but at lesat you have 1 answer.
ben
From the lotuscars forum and according to lotus itself, the change at 6200 is the more efficient.
it use the torque of the first came at low-medium revs and the power at high rev of the second.
they see this as 2 engines with their own power curve. 6200 is seen as the best trade for both.
If you lower the treshold, you end up with less torque on second came (peaky engine)
I just repeat what I have red and can't comment it myself, but at lesat you have 1 answer.
ben
I am looking into this seriously and have made initial enquiries. The Lotus ECU is encrypted and as of yet has not been cracked so it would need another ECU. The SC cars have it dropped as the forced induction can deal with better low down torque.
I am sceptical that the 6200 point is right as their is a power and torque drop off at about 5500 so I do believe it could be lowered slightly.
Reports that a lower switchover doesn't work I beleive come from a far lower point ie 3000-4000 odd. A remapped ecu at about 5000 I think would be alot better.
Your torque would be improved as in my case I have improved induction and exhaust. I wouldn't want to switch it down on a std engine. However most peple at this sage have added bits already.
There is a car in Italy running a non std ecu and cams etc with a lower change over that is rumoured to be producing an extra 40bhp to std.
There will be power upgrades availiable in the next six months so I would just watch this space. This includes Lotus who as always are working on something.
I am sceptical that the 6200 point is right as their is a power and torque drop off at about 5500 so I do believe it could be lowered slightly.
Reports that a lower switchover doesn't work I beleive come from a far lower point ie 3000-4000 odd. A remapped ecu at about 5000 I think would be alot better.
Your torque would be improved as in my case I have improved induction and exhaust. I wouldn't want to switch it down on a std engine. However most peple at this sage have added bits already.
There is a car in Italy running a non std ecu and cams etc with a lower change over that is rumoured to be producing an extra 40bhp to std.
There will be power upgrades availiable in the next six months so I would just watch this space. This includes Lotus who as always are working on something.
fish said:
I am looking into this seriously and have made initial enquiries. The Lotus ECU is encrypted and as of yet has not been cracked so it would need another ECU. The SC cars have it dropped as the forced induction can deal with better low down torque.
I am sceptical that the 6200 point is right as their is a power and torque drop off at about 5500 so I do believe it could be lowered slightly.
Reports that a lower switchover doesn't work I beleive come from a far lower point ie 3000-4000 odd. A remapped ecu at about 5000 I think would be alot better.
Your torque would be improved as in my case I have improved induction and exhaust. I wouldn't want to switch it down on a std engine. However most peple at this sage have added bits already.
There is a car in Italy running a non std ecu and cams etc with a lower change over that is rumoured to be producing an extra 40bhp to std.
There will be power upgrades availiable in the next six months so I would just watch this space. This includes Lotus who as always are working on something.
Good point, I agree with that, if you dump the cat and have a better exhaust and inlet it can be lowered to a much better to live with dayly level...and have more torque also
So it can be done ok, but how ectxatly? I don't know, maybe they guys in the USA know?
or will know soon, because they only have the yota engine to work at
GTRene
The toyota engine uses a system similar to the VTEC on honda engines. And I've tuned loads of those.
This is how you determine the best switch-over point (you will need a tunable ECU):
Dyno the car with the switch-over set as low as possible (3-4k maybe).
Dyno again with the switch-over set very high ,or turned completely off.
Overlay the two dyno graphs and the optimum switch-over is the one that gives you most area under the curve.
A stock honda Civic VTI has VTEC switch-over at 5500, but the optimum point is actually 5000-5100. It's probably set higher to give you better gas mileage. But if you don't floor it, VTEC won't engage so it doesn't matter much. Guess it's the same with the 'yota engine
This is how you determine the best switch-over point (you will need a tunable ECU):
Dyno the car with the switch-over set as low as possible (3-4k maybe).
Dyno again with the switch-over set very high ,or turned completely off.
Overlay the two dyno graphs and the optimum switch-over is the one that gives you most area under the curve.
A stock honda Civic VTI has VTEC switch-over at 5500, but the optimum point is actually 5000-5100. It's probably set higher to give you better gas mileage. But if you don't floor it, VTEC won't engage so it doesn't matter much. Guess it's the same with the 'yota engine
I know by ragnorak racing they also do things like that, just read all the package's
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Our remapped ecu changes the air fuel, and timing to maximize your vehicles horsepower and torque curves.This upgrade is a great entry into the world of improved performance without sacrificing reliability, while maintaining the stock OEM look and feel. No check engine lights to worry about or messy wiring cluttering up your engine bay. This reflash is upgradeable, so when you decide to purchase a new performance part for your car we can remap the ecu for you to maximize your gains. This service is complimentary when upgrading with Ragnorak Racing parts, we only charge you shipping and handling. If you are using another companies products, please check with us before sending in your ecu to verify that we have the map required to flash your ecu.
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www.ragnorakracing.com/page/page/2337807.htm
GTRene
----------------------------------------------------------------------------------------
Our remapped ecu changes the air fuel, and timing to maximize your vehicles horsepower and torque curves.This upgrade is a great entry into the world of improved performance without sacrificing reliability, while maintaining the stock OEM look and feel. No check engine lights to worry about or messy wiring cluttering up your engine bay. This reflash is upgradeable
, so when you decide to purchase a new performance part for your car we can remap the ecu for you to maximize your gains. This service is complimentary when upgrading with Ragnorak Racing parts, we only charge you shipping and handling. If you are using another companies products, please check with us before sending in your ecu to verify that we have the map required to flash your ecu. -----------------------------------------------------------------------------------------
www.ragnorakracing.com/page/page/2337807.htm
GTRene
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