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 Posted: Thu Jul 07, 2011 5:31 am |
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Joined: Aug 18, 2010
Posts: 39
Trade Rating: 0
Location: Sussex
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| macj wrote: |
| Schumi wrote: |
| Did you connect wideband on your exhaust pipe directly for AFR log. And why your AFR line isnt smooth. And I think 12 AFR is to much for N/A engine. As you can see when you going far from 13-13.5 AFR you are losing power. You have to fix you AFR 13-13.5 on full throttle. |
The best AFR is 14.7... I had this issue with Atspeed recently who think an AFR of 12 is optimum and say my fuel map is all wrong when it is between 14.2 and 14.9.... I gave them the chance to map it themselves but I ended up loading my original map back on after 3 hrs as they couldnt get the engine to run on theirs 
Dont expect the lighter flywheel to make a difference to a RR graph Kyle  |
The theretical best AFR for power is 12.7:1 14.7:1 is lambda one and perfect for part throttle driving.
In reality engine modern engines will make more power with a leaner mixture but anything less than 13:1 leaves you scarily close to det/melting problems!
TU5J4 race engines are happy at 13.1:1 on full throttle but thats as lean as Id ever give one back to a customer.......
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| The sole UK importer for high performance Cat Cams, with a huge range for the 206 GTi and 180. Cat is the market leader in EW10J4 profiles. | |
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Posted: Thu Jul 07, 2011 6:42 am |
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Joined: May 31, 2010
Posts: 359
Trade Rating: +4
Location: northumberland
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| Catcams wrote: |
| macj wrote: |
| Schumi wrote: |
| Did you connect wideband on your exhaust pipe directly for AFR log. And why your AFR line isnt smooth. And I think 12 AFR is to much for N/A engine. As you can see when you going far from 13-13.5 AFR you are losing power. You have to fix you AFR 13-13.5 on full throttle. |
The best AFR is 14.7... I had this issue with Atspeed recently who think an AFR of 12 is optimum and say my fuel map is all wrong when it is between 14.2 and 14.9.... I gave them the chance to map it themselves but I ended up loading my original map back on after 3 hrs as they couldnt get the engine to run on theirs
Dont expect the lighter flywheel to make a difference to a RR graph Kyle |
The theretical best AFR for power is 12.7:1 14.7:1 is lambda one and perfect for part throttle driving.
In reality engine modern engines will make more power with a leaner mixture but anything less than 13:1 leaves you scarily close to det/melting problems!
TU5J4 race engines are happy at 13.1:1 on full throttle but thats as lean as Id ever give one back to a customer....... |
So is the afr shown on my graphs ok?
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| 2003 aegan blue gti 180 - CatCams 804's camshafts - CatCams vernier pulley - R.S.Tuning remap
Gti 180 Project Thread | |
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Posted: Thu Jul 07, 2011 12:19 pm |
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Joined: Feb 07, 2010
Posts: 3085
Trade Rating: +12
Location: Essex
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Seems fine to me mate... bit rich low down in the rev range but hey..... I am sure you will get it sorted on your next mapping session
I am assuming that as my plugs are a nice brown and my exhaust is black.... that I am running miles too weak for a car on 45mm T/B`s 
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Posted: Thu Jul 07, 2011 2:58 pm |
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Joined: May 31, 2010
Posts: 359
Trade Rating: +4
Location: northumberland
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Is it possible to fit itb's on the 180 and still be able to drive it on the road easily enough, I ask this as I know Jamie was attempting this but give up in the end
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| 2003 aegan blue gti 180 - CatCams 804's camshafts - CatCams vernier pulley - R.S.Tuning remap
Gti 180 Project Thread | |
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Posted: Thu Jul 07, 2011 3:24 pm |
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Joined: Feb 15, 2010
Posts: 1848
Trade Rating: +6
Location: Leamington Spa
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Yeh but you loose your traction control and stuff as obvs it's cable few lads next to me had them and there all road cars
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Posted: Thu Jul 07, 2011 4:15 pm |
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Joined: Feb 08, 2010
Posts: 901
Trade Rating: +1
Location: Istanbul / Turkey
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| Chris180 wrote: |
So is the afr shown on my graphs ok? |
I think no. Just analyz your graph. When your AFR peak near to 13 you will have more power. Your graph isnt smooth. Some power rise and down. All rise point showing near 13 afr. And all power down showing near 12 afr. My english is bad but i think you will see in that graph. That is just non smooth and to safe map for me. And that is another point. What is your ignition status. How advance your ignition. I think your country fuel quality more better than us. So you can take more advance on your engine. Advance also change your AFR. So if your tuner have knock tune kit or headphones for knock listen first all off find your max point of advance on full throttle. And recheck you AFR. I think you need 4 dyno run.
@Macj. 14.7 is just theretical value. Some engines love rich and some engines love lean AFR. We find 13-13.5 value is best hp & torq balanced AFR on EW10J4 on standalone ecu.
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| 2005 206 RC RED
Bilstein B14 Coilover / Brembo 4 Pot Front 330x28 - Rear 325x8 / Quaife ATB Limited Slip Diff / Janspeed Catback
Lot's of CNC machined customs pars.  | |
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Posted: Thu Jul 07, 2011 6:31 pm |
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Joined: Feb 13, 2010
Posts: 451
Trade Rating: +2
Location: Stafford
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Iv looked at my AFR from th elast time i went rs tuning and it starts at 14.1 then drops down to 11.5 at 3300 rpm and then go's up to 14.5 @ 4000 rpm intill 7000 rpm
The drop must be when the vvt start advancing.
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| 206 Gti 180 Cat-camshafts 804's, Cat cams CTPE 002 exhaust vernier pully, RS tuning remap, Cat back janspeed exhaust, K@N Typhoon induction kit- heat wrapped, Exhaust manifold heat wrapped, Goodridge brake flexi's poly bushs in rear lateral arms, blue led speedo convertion, 50mm Eibach sport line springs, ......
180 Doctor
Hemwoods Gti180 / Pug specialist | |
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Posted: Fri Jul 08, 2011 4:54 am |
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Joined: Feb 08, 2010
Posts: 901
Trade Rating: +1
Location: Istanbul / Turkey
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| gti180boy wrote: |
Iv looked at my AFR from th elast time i went rs tuning and it starts at 14.1 then drops down to 11.5 at 3300 rpm and then go's up to 14.5 @ 4000 rpm intill 7000 rpm
The drop must be when the vvt start advancing. |
Exactly. Your dyno graph maybe also need fixment.
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| 2005 206 RC RED
Bilstein B14 Coilover / Brembo 4 Pot Front 330x28 - Rear 325x8 / Quaife ATB Limited Slip Diff / Janspeed Catback
Lot's of CNC machined customs pars. | |
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Posted: Wed Aug 15, 2012 7:18 am |
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Joined: Dec 10, 2010
Posts: 812
Trade Rating: 0
Location: Cape Town
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Bump Bump Bump
One of the few projects threads that I seem to have missed. Very interesting read
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