ECU Mods for ETHANOL Fuels???????

[Ghostrider]

Firstly, I have read the 1UZ Mods thread and can't find anything relevant.

As ETHANOL is an oxygenator (puts more oxygen in the fuel) I would assume the stock ECU's aren't planed or programmed to use this fuel option.

To get the benefits of ethanol fuels, the ECU has to be modified.

MY QUESTION IS ......................

Has anyone made a piggyback, or a modified chip for a 1UZ ECU to work with ethanol blended fuel?

AND for those with economy problems in 1UZ's, my 1UZ MX83 just returned better than 10L/100 on a trip. 565km on 52.5L, Sydney to Canberra & return = 9.2389L/100km

Cheers, D

[Chrisso]

What type of ethanol fuel are you talking about? Regulary pump varieties of 5-10% or something more?

I believe that a regular ecu should adjust itself well to standard ethanol enhanced fuels. Most modern cars are made with the capability. Think of it in terms of going from regular unleaded to a premium. The ecu, through the oxygen, afm/map, knock sensors will adjust the amount of fuel at different levels of throtle usage.

True, ethanol has an affinity for water and hence carries more oxygen than regular fuel, but the ecu should be able to compensate for this. As an extreme example there are flexi fuel cars which can run on up to 85% ethanol, such as the Saab.

In short, your ecu should adjust your mix to run a little bit richer. There's plenty of info about ethanol fuel on the net.

Chris.

[chris davey]

Only in closed loop operation though.

When you are booting it it will be open loop. Mine went richer by about .7 from 11.5 to 10.8:1 when I went from Shell ultra racing 100oct to BP ultimate 98.

[mrshin]

The ethanol fuels will tend to run slightly leaner up top, and the 1UZ sure isn't going to complain about that.

Most 1UZ economy problems are from lead feet, knackered oxy sensors or bad wiring with conversions.

[Ghostrider]

Most 1UZ economy problems are from lead feet, knackered oxy sensors or bad wiring with conversions.

Your right there, I can make mine use 25+L/100 if I want to.

Cheers, D

[mrshin]

Your right there, I can make mine use 25+L/100 if I want to.

Cheers, D

I know the feeling

[Ghostrider]

I put this question to the masses because in another forum, it has been suggested that Nissan ECU's & in particular RB/GTR's need to be tuned to suit the ethanol blend so as to extract it's full potential. eg Shell 98 Racing

So I thought it might be a similar situation on Toyota.

Cheers, D

[mrshin]

Well, anything needs tuning the get the best - but then a 1UZ ECU isn't exactly tuned for maximum potential at any time.

[CrUZida]

They say that you can't use Ethanol in any of the 5MGE or 7MGE engines.

Now since the 1UZ injectors are almost identical to the 7M ones, its possible that you can't use Ethanol in the 1UZ either.

But, they also say that all Lexus vehicles (bar pre2002 IS200) are safe to use Ethanol on...

Food for thought anyway.

[takai]

I thought that the Ethanol restriction for the M engines was due to the heat. We all know that Ms dont like heat much at all.

[jeffro ra28]

I thought that the Ethanol restriction for the M engines was due to the heat. We all know that Ms dont like heat much at all.

Ethanol like methanol is a refrigirant. It burns much much cooler than petrol.
For example an engine with 30psi manifold pressure running on pure methanol and right tune has an EGT of about 1000F where as a naturally aspirated engine with petrol will run an EGT of atleast 1200F

Food for thought maybe......

[whatthe?]

I thought Ms didnt like it because it ate seals etc?

[takai]

Sorry, needed italics. Post edited.

[FASTFOO]

My UZX73 loves boost 98
I will buy it whenever I am near a united s/s and it is bog stock factory ex exhaust.
MATT.

P.S. do not try it with aftermarket ECU unless you have tuned for it!!!!!!!! (motor go melt now)

[mrshin]

I feed boost 98 into things quite often myself; my Cressida 7M used to love it - stopped the pinging better than PULP.