Post #1
Hi guys, just setting the 205 up on the dyno and we are seeing AFRs of 13.5 when on boost. Is 13.5 going to run it too lean and risk det or is it within normal safe parameters?
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displaying posts 1 to 22 of 22
| Author | Subject: Acceptable AFR on Lynx low boost SC |
 judley
Regular  Location: Hartlepool Registered: 25 Jan 2009 Posts: 228 Status: Offline |
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 Posted 26th Sep 2011 at 19:33
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rich_w
Seasoned Pro  Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #2
At what point in the rev range is that AFR?What exhaust / intercooler do you have? What fuel pump are you running?  Rich ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 26th Sep 2011 at 20:30
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smegal
Seasoned Pro  Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #3
13.5 is rich, not lean.________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 26th Sep 2011 at 20:51
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #4
smegal wrote: 13.5 is rich not lean. It's rich of stoich, but it's not necessarily rich for a boosted engine map....  ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 26th Sep 2011 at 20:53
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judley
Regular Location: Hartlepool Registered: 25 Jan 2009 Posts: 228 Status: Offline |
Post #5
rich_w wrote: At what point in the rev range is that AFR? What exhaust / intercooler do you have? What fuel pump are you running? Rich Thanks for getting back to me Rich, you can ignore that text I sent you earlier ;-) The AFR is flat from 2,000 RPM all the way to the redline. Exhaust is 2" Magnex decat Standard fuel pump Unbranded IC as the high boost IC was too large. The IC felt cool after the dyno run though ECU is your low boost one {bought from birk} and is I believe a later version with better idle control? Injectors are the 440cc ones I got from you a couple of weeks back What do you reckon mate? |
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Posted 26th Sep 2011 at 21:01
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smegal
Seasoned Pro Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #6
You'll find that it is only like that on full throttle. On part throttle at constant speeds mine hovers round 14.7 ish.________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 26th Sep 2011 at 21:52
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judley
Regular Location: Hartlepool Registered: 25 Jan 2009 Posts: 228 Status: Offline |
Post #7
smegal wrote: You'll find that it is only like that on full throttle. On part throttle at constant speeds mine hovers round 14.7 ish. Shouldn't it be around 11 or 12 though? |
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Posted 26th Sep 2011 at 22:06
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judley
Regular Location: Hartlepool Registered: 25 Jan 2009 Posts: 228 Status: Offline |
Post #8
smegal wrote: You'll find that it is only like that on full throttle. On part throttle at constant speeds mine hovers round 14.7 ish. Shouldn't it be around 11 or 12 though? |
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Posted 26th Sep 2011 at 22:06
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judley
Regular Location: Hartlepool Registered: 25 Jan 2009 Posts: 228 Status: Offline |
Post #9
smegal wrote: You'll find that it is only like that on full throttle. On part throttle at constant speeds mine hovers round 14.7 ish. Shouldn't it be around 11 or 12 though? |
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Posted 26th Sep 2011 at 22:06
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rich_w
Seasoned Pro Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #10
You want it to be around 12.5.To richen yours up, I would check your fuel pressure isn't dropping off at the top end, if that's OK I can supply a slightly smaller restrictor which will richen it up. Intercooler and exhaust choice are the main things that will affect the AFR on our conversion. 13 is not dangerously lean - so don't worry too much. Make sure you use V Power too ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 26th Sep 2011 at 22:30
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judley
Regular Location: Hartlepool Registered: 25 Jan 2009 Posts: 228 Status: Offline |
Post #11
rich_w wrote: You want it to be around 12.5. To richen yours up, I would check your fuel pressure isn't dropping off at the top end, if that's OK I can supply a slightly smaller restrictor which will richen it up. Intercooler and exhaust choice are the main things that will affect the AFR on our conversion. 13 is not dangerously lean - so don't worry too much. Make sure you use V Power too Thanks Rich. Can you PM me a price for the restrictor please. |
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Posted 26th Sep 2011 at 22:49
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buzzbrightyear
Seasoned Pro  Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #12
Does a bigger a/c make it richer or leaner?________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 5th Oct 2011 at 18:45
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #13
Leaner________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 6th Oct 2011 at 10:28
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #14
Need to check mine, its regularly in the 14's________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 6th Oct 2011 at 10:31
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mabgti
NV motors  Location: Bham tunnel @7400rpm Registered: 28 Aug 2003 Posts: 9,127 Status: Offline |
Post #15
Dave you'll need to get that checked. Just double check the sparkplugs are cooler and that you have no leaks on the exhaust side of things.________________________________________ Team Supercharged Gti-6NV Motorsport Automotive Performance Tuning 0121 448 7515 ECU Remapping/ DPF removal VAG/BMW Diag and Option Coding Peugeot Planet ECU coding/transponder programming etc www.nvmotorsport.com Facebook Page Project S6 |
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Posted 6th Oct 2011 at 11:21
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #16
Will do, I've got Rich W giving it the once over soon but I'm driving it off boost until he can give it the ok.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 6th Oct 2011 at 14:36
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #17
What number spark plugs should they be by the way? Looks like I only just missed out on a f*cked Rotrex, the traction fluid was nearly all gone from the reservoir, an inch below the minimum so I'll be investigating the pipework for leaks this weekend.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 6th Oct 2011 at 14:39
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ballardpaul
Seasoned Pro  Location: Croydon Registered: 22 Jul 2008 Posts: 4,135 Status: Offline |
Post #18
I believe 7s are the ones you want  ________________________________________ Phase 2 Blaze GTi 6 (Standard) SoldPhase 3 Supercharged China GTi 6 (249.8 BHP) Sold Phase 3 Supercharged Diablo GTi 6 (443 BHP)Sold Nissan 350Z (300 BHP) |
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Posted 6th Oct 2011 at 15:42
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rich_w
Seasoned Pro Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #19
You want the 7s or 8s for low boost, depending of the nature of use.The plugs will not affect the air fuel ratio in anyway, but play an important part in heat management. ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 6th Oct 2011 at 16:12
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #20
Higher the number the hotter they get, correct?________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 6th Oct 2011 at 16:38
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chris with a pug
Seasoned Pro  Location: Southampton Registered: 16 Feb 2003 Posts: 5,366 Status: Offline |
Post #21
daveyboy wrote: Higher the number the hotter they get, correct? Depends on the make IIRC |
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Posted 6th Oct 2011 at 16:56
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #22
If they're NGK's the higher the number the cooler they run, with Bosch it's the other way around.________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 6th Oct 2011 at 17:15
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