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Air fuel ratio gains in a six 4.0? 

 

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 Post subject: Air fuel ratio gains in a six 4.0?
Posted: Mon Apr 25, 2005 6:49 pm 
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Guys I was trying to work out how much gain is to be had in a i 6 if fuel ratios were taken from 10 to say 12.5? Also without a chip.


Has anyone had success or results from this?

 

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Posted: Mon Apr 25, 2005 7:21 pm 
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ideally shouldnt it be something like 13.7:1?

10:1 seems a bit f*****g rich to me

 

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Posted: Mon Apr 25, 2005 7:28 pm 
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i'm having the same issues - mines at 10.04 :?

 

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Posted: Mon Apr 25, 2005 7:36 pm 
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more fuel doesnt mean more power!
all car companys richen there engines more than needed just so that they last long even if there floged day in day out. thats why when chipping a ecu, most of the time u will get more power and use less fuel as it will put less fuel in than standard and change ign timing to compensate.
for example fitted a chip into a 03 wrx and before it was running down to 11.4 a/f and after chip was 12.9. and got around 35 more power and use less fuel.
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Posted: Mon Apr 25, 2005 7:47 pm 
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thats exactly what they said, they want less fuel.
and they want to know the gains of doing so.

 

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Posted: Mon Apr 25, 2005 7:51 pm 
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sorry my mistake read it wrong.

much gains are to be had, just things to look out for are engine will run slightly hotter, so changing of oil more offen is needed.
and depending on chip but usually they require 98 octain nothing less.
just a matter of deciding what chip to get and how much u want to spend
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Posted: Mon Apr 25, 2005 8:04 pm 
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Thatsa what I am after ..real life experiences with just air fuel ratio changes and power results.+

I want to know ...how many kw can be picked up?

 

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14.77 @92.71mph July 06 14.52@95.68mph July 07 14.241 96.7 MPH in a shoebox/taxi au ford wagon!!Bwahahah still cant believe it!!!

Last edited by USELESS on Mon Apr 25, 2005 8:07 pm, edited 1 time in total.

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Posted: Mon Apr 25, 2005 8:06 pm 
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well u will get more power and usually a good amount, apart from a/f will have to change ignition timing as well, but the piggyback chip will look after all that.
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Posted: Mon Apr 25, 2005 8:12 pm 
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I ended up with 125 rwkws with air fuel of 10...the chip shop thinks there is 150 rwkws to be had because of how bad it is. I was hoping to see what people did get.

 

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14.77 @92.71mph July 06 14.52@95.68mph July 07 14.241 96.7 MPH in a shoebox/taxi au ford wagon!!Bwahahah still cant believe it!!!

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Posted: Mon Apr 25, 2005 8:15 pm 
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yeah sounds about right. which is good power at the wheels to
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Posted: Mon Apr 25, 2005 8:51 pm 
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It seems I have heard plenty about chips in AU's make heaps of power, especialy when there are other mods.
JMM uses a UNICHIP in his dev 3's doesnt he?

 

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Posted: Mon Apr 25, 2005 9:15 pm 
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I dont think he uses a chip in dev 3hl.

 

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14.77 @92.71mph July 06 14.52@95.68mph July 07 14.241 96.7 MPH in a shoebox/taxi au ford wagon!!Bwahahah still cant believe it!!!

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Posted: Mon Apr 25, 2005 9:42 pm 
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JMM don't use a chip on anything but their Dev5a.

 

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Posted: Mon Apr 25, 2005 10:22 pm 
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I thought the post was about the AU dev packages. Was talking about that the dev 3 package (which is the 'second level' AU dev kit?)

Like your AU Useless, isnt that what the thread was illuding too?

... *scratches head*

 

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Posted: Mon Apr 25, 2005 11:03 pm 
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well if i get some money i will find out for you.

But looking in to it I have found the same story before a few times with I6's

A/F in the 10's and rwkw around 128 going to 141rwkw and 12.6:1

same cammed engine 132rwkw going to 150rwkw with unichip. So thats ign advance gains tuning on Optimax and A/F ratio giving the gains so at a guess there is 10-15% more to come from better air fuel ratios and another 5% from ign advance and tuning for PULP only.
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