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The mkiv Supra Owners Club

Detonation Prevention


Jellybean

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Car is a BPU Jspec 2JZGTE

 

Fuel in Southern Ireland is 95 Octane, The BOS Scheme places an obligation on suppliers of mineral oil to ensure that 6.383% (by volume) of the motor fuels (generally Gasoline and Motor Diesel) they place on the market in Ireland is produced from renewable sources, e.g. Ethanol and Biodiesel. The obligation was increased from the 1st January, 2013.

 

At the Pumps, Petrol is still indicated as being 95 Octane

 

http://nora.ie/biofuels-obligation-scheme.141.html

 

What are my options, fuel here seems to be getting worse?

Without costing a fortune

 

  • Octane Booster (NF Octane stuff seems to get good reviews)
  • Water Methanol Kit ?
  • Avgas ? Toulene ?
  • Race fuel will go off and is $$$

 

It am not looking for more power , just engine protection ; or can anything be done, maybe just retard the timing and live with what is available ?

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Water injection, toluene in the fuel at 10% by volume, a decent map, with knock sensor feedback, and that's as far as you can go without buying expensive fuels or stripping the engine and optimising squish. I have yet to see a bottled octane booster that's any good. Most say, in the small print, that they raise octane say 3 "points". That doesn't mean they raise it from 95 octane to 98 octane, it's a clever marketing ploy. It means it raises it from 95 octane to 95.3 octane. If you're lucky....

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Thanks Chris

 

I am the biggest skeptic when it comes to Octane boosters , only reason I am tyring the NF Octane stuff is on the Dyno without the NF my friends MK3 Supra was knocking up at the 60 mark and dropped to 30 with it

 

My other friend has a knock sensor on his R35 GTR , part of the COBB package ; he ran 115 Octane Pantra mixed with 95 but get better results with the NF based on the logs

 

When I get mine back I am going to do a power run with and with out; worth a punt for 16 gbp

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Presuming you have a std ECU? WI would be the best option at a pinch, but a remap as suggested would be the absolute safest option.

 

I am looking into the Haltech Elite 2500 , bit pricey like the Syvecs but it is worth it for the fail safes , cheaper than a rebuild

 

I would like a Syvecs but with logistics from Ireland it is $$$ getting to the UK, support etc for any teething problems

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Toluene in 405 litre drums used to be quite cheap from industrial supply houses, but good old `elf `n' safety meant I had to collect it in a divided van or in a trailer, and it became a PITA. In fact I had a drum nearly come out of a trailer on the motorway when I had to swerve for an errant lorry tyre carcass. That would have made the news...

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I have the same issue, same specs, same octane fuel.

 

My research and test is as follows (Based on dyno runs, same dyno, very similar conditions every run)

 

Base run with 95 octane - 225wkw

95 Octance plus WI - 234wkw. Torque went up by 5nm, AFR in the 8.0s on WOT

98 race fuel (Made by BP) - 250wkw Torque went up by 30nm, AFR in the was 9.8 on WOT

I have tried NF Octane booster, the weakest mix, did not dyno, but AFR was about 9.2 on WOT.

 

Basically, you can remap for 95 fuel, it will be safe, but car is not going to make its max power..

 

I'm probably going to go with the Haltech as well with an ethanol map, safety and power increase..

 

I was shocked with the difference in the road performance when I tried the 98 race fuel, car went absolutely mental..

Edited by Samurai 20V (see edit history)
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Is that not unusually rich, or does the WI just make it appear so?

 

It's too rich and killing power if it's accurate. I would imagine it could be weakened off quite a bit and still stay safe, what are the plenum air temps like?

 

Its been like that since I had the car in Japan..

 

My theory is that the stock ECU is pulling timing and making the car rich to protect itself because of the low octane fuel.

 

I should add on the runs with 98 octane the WI was tried with it on and off, the was 2nm gain with it on.

 

I don't have intake air temp logs, I definitely do agree the car will benefit from being mapped, the issue is reliable tuners in my hometown.

 

There is only one, he is very busy and pretty pricey, I do plan to map the car, its a matter of when..

 

(My AFR gauge is an HKS unit which uses the Bosch UEGO sensor, should be fairly accurate I would guess)

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Syvecs and flex fuel sensor would be my choice, you can then have it mapped on the local fuel and then with meth in the tank, the flex fuel sensor and map will then modify the map on the fly depending how much meth you have in the tank.

 

No messing about worrying that other tanks are topped up.

 

:thumbs:

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Syvecs and flex fuel sensor would be my choice, you can then have it mapped on the local fuel and then with meth in the tank, the flex fuel sensor and map will then modify the map on the fly depending how much meth you have in the tank.

 

No messing about worrying that other tanks are topped up.

 

:thumbs:

 

Good advice..

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