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SUPRAGTE
Forums Junkie


Location:
North Sydney
Registered:
May 2002
Re: Tuning day Wed, 28 May 2003 08:08 Go to previous messageGo to previous message
Quote:

Every test I've seen where a "higher-octane" fuel is put in place of a lower one a big swag of power has been lost, not gained, the density had a much lesser impact.


Frankie,
I've haven't seen any graph's where you loose power with higher octane fuel so I can't comment but I don't see why you would loose lots of power, its strange.

Quote:

Problem with what you are saying is that maximum power is not made under closed loop, so that argument doesn't make sense. I was under the assumption they were aiming for stoichiometric AF ratios and highly advanced ignition under closed loop, but thats as outlined above, different to maximum power.



That's right max power isn't made on close loop, it's too dangerous, particularly when sensors can fail. Yes they do go for stoich and max timing in closed loop.

Quote:

If the engineers put it in the ignition tables accounting for the lowest common denominator, then why would they bother to claim their max power is only produced at a higher octane level?


I don't know why they say 7MGTE Supra 173Kw on high octance fuel. I've never really seen them state a power rate that can only be acheived on a high octane fuel. Perhaps they are urging drivers to use higher octane fuels as much as possible, they are always cleaner and better for the longevity of the engine anyway.
Higher octane fuels usually have more density as they are a more refined fuel, that could be the reason, the more density gives the extra power (would be slight, but still a gain)

Quote:

I think what you're getting is that they're not using knock sensors to determine the octane rating, but in that case what is going on?


They don't use knock sensors to determine octane rating. They are used to sense detonation occuring only at light throttle conditions and retard the timing. Octane rating is only one of a few reasons for detonation like intake air temp, which you can't control as you can with what fuel you put in your tank.

Pete,
using closed loop whilst on load is silly, as you just said but you were saying earlier
Quote:

when we were testing full load (MAP 100%) I'm sure we could see if it was knocking during this power run. When it does detect a knock it retards the timing depending on the size of the knock (can set the range, I think we set the max retard is about 8 degrees).



I thought you were saying that you've set it up to retard the timing when it detects knock on full load above. I think you mean, in closed loop it can retard the timing up to 8 degrees if it detects knock.

Damn thats alot of text! Sore arms now, hehehe Smile

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SubjectPosterDate
Read Message   Tuning day SupraPeteSun, 25 May 2003 02:22
Read Message   Re: Tuning day SUPRAGTESun, 25 May 2003 04:14
Read Message   Re: Tuning day SupraPeteSun, 25 May 2003 04:54
Read Message   Re: Tuning day SUPRAGTESun, 25 May 2003 05:37
Read Message   Re: Tuning day SupraPeteSun, 25 May 2003 08:34
Read Message   Re: Tuning day SUPRAGTESun, 25 May 2003 09:36
Read Message   Re: Tuning day SupraPeteSun, 25 May 2003 10:58
Read Message   Re: Tuning day SUPRAGTESun, 25 May 2003 11:33
Read Message   Re: Tuning day SupraPeteSun, 25 May 2003 11:41
Read Message   Re: Tuning day SUPRAGTETue, 27 May 2003 09:53
Read Message   Re: Tuning day DannersTue, 27 May 2003 22:46
Read Message   Re: Tuning day justcallmefrankWed, 28 May 2003 01:09
Read Message   Re: Tuning day SupraPeteWed, 28 May 2003 02:21
Read Message   Re: Tuning day SUPRAGTEWed, 28 May 2003 04:56
Read Message   Re: Tuning day justcallmefrankWed, 28 May 2003 05:02
Read Message   Re: Tuning day SUPRAGTEWed, 28 May 2003 06:08
Read Message   Re: Tuning day justcallmefrankWed, 28 May 2003 06:17
Read Message   Re: Tuning day SupraPeteWed, 28 May 2003 06:46
Read Message   Re: Tuning day  SUPRAGTEWed, 28 May 2003 08:08
Read Message   Re: Tuning day justcallmefrankWed, 28 May 2003 08:14
Read Message   Re: Tuning day SupraPeteWed, 28 May 2003 12:55
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