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mybrains

Detune V36 to run on unleaded 91?

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Hi

has anybody looked into remapping the ECU to run on a lower pump gas (maybe to switch hi/low depending on petrol prices!)

SYD is hitting $1.80L for 98 now so its becoming an issue. Also just ho much power would we really lose ?  20kw?  drop the 0-100 by a few hundredth of a second? (do you have any references to the impacts here?)

I looked on the web and read in the USA that the SpecialityZ shop with the Guru Seb tunner (a Guy) does make many maps using Uprev Pro Tuner. On their home page SAS is shown as the NSW dealer (David - He helped with my 200sx mapping years ago)

http://uprev.com/secure/dealers

I might ping him and see if its possible. Might also see if a E98 map could also be added for a bit more than 245 Kw ;)  hehehe

 

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it's tuned for 95 and can run on 91 but only recommend for short periods. Maybe a tank or 2.

It wont burn as clean and things get dirty over time.

you might lose 5kw. thats a guess

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You would need to know exactly why 95 is specified.

In some cases it is due to the requirement for low sulphur fuel (our 91 has a max of 150ppm, 95 or 98 has a max of 50ppm).

Usually it is due to compression ratio, which is why the manual will often state to avoid full throttle if you need to use 91 in an emergency.

You can't 'tune' the compression ratio, you would need to modify the engine to reduce compression which would make the whole process cost prohibitive.

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Hi Sonicii

True, cant reduce 11:1 compression on these  (check new QX50 variable compression block that does adjust bottom end cycle - wow)

From what I read on 307Z forum, its just cam timing to reduce valves/charge and retard. See all the maps people are running here

http://www.the370z.com/tuning/34422-what-maps-everyone-uprev-tune-running.html

PS Dave at SAS quoted 1500 to remap with dyno work and petrol swaps inclusive.

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You want to spend 1500 bucks to let you use a fuel that's 20c a liter cheaper... in other words you need to buy 7500L of fuel to make it worth while, which means assuming you're getting 10L/100km thats 75000km to make it worth while. Doesn't make sense to me

And you have less power and would actually have slightly worse fuel economy that would mean it'd take even more km to break even.
 

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If you can't afford to run it on 98 RON, sell it and buy something more economical.
I run my daily on 98 (turbo Subaru), times are tough but if you want to drive something that run on 98, too bad.

I'm considering getting a Leaf in a few years' time.

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Cost of fuel is the SMALLEST part of the cost of ownership of any vehicle that's not already at EOL.

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Just run it on united e10 (95 octane) just dont go ringing its neck everywhere and understand that it wont run as crisp as the ecu will most probably start retarding the timing.

Otherwise buy yourself a commodore, feed it 91 and thrash its tits off

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Is it really so expensive?  

If you cant afford to buy 98octane then sell nissan and buy prius. 

Here in Finland, gasoline costs more than 1.7€L(2.75aud) have said that when gasoline costs more than 2€L (3.24aud) so only friends drive their cars😂

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I filled up for $1.65/L (98 RON), bargain!

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21 hours ago, V35_Paul said:

it's tuned for 95 and can run on 91 but only recommend for short periods. Maybe a tank or 2.

It wont burn as clean and things get dirty over time.

you might lose 5kw. thats a guess

I would refrain from spreading misleading facts.

It requires 95RON+ to suppress knock not because it needs "clean" fuel, nothing about it won't burn as clean and things get dirty over time.

You might lose 10~30kW because you've go past MBT and/or in knock territory.

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7 hours ago, Dose Pipe Sutututu said:

I would refrain from spreading misleading facts.

It requires 95RON+ to suppress knock not because it needs "clean" fuel, nothing about it won't burn as clean and things get dirty over time.

You might lose 10~30kW because you've go past MBT and/or in knock territory.

Yeah.. I get a bit sick of saying this.  RON is a measurement of the fuel's resistance to knock or self detonation, in Australia there is also a considerably lower allowable level of sulphur in premium fuels, other than that, there is no difference beside what individual fuel suppliers may or may not decide to add to their premium fuels.

I'm also not sure about the newer versions of the VQ, but the DE does not 'adjust' to low octane fuels.  If it detects knock, it switches to a 'knock map' for timing and richens the fuel mix.  It is a safety mechanism to try to prevent engine damage, not a tuning mechanism.

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As you can see, MyBrains, you're looking at this all wrong.

Remapping an ECU is not a cheap task, even if you can get your hands on a generic map to avoid the dyno. The math dispels any theory for cost savings.

The engine is mechanically set up to perform. If you're actually prepared to lose even 10kW of performance, then you really don't want or need a performance vehicle. Obviously, there's no point in doing an engine swap to an SR20DE (HA!) because of the math we spoke of before.

So that leaves you with a few options:
Drive with a much lighter foot
Sell the car and downgrade to a less-thirsty vehicle
Rip the motor and drivetrain out and pedal it like Fred Flintstone

That's the reality. Personally, I'm not made of money and I'm not happy about the rising fuel costs but I love my car too much to give up anything about it and potentially damage it.

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