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Boost enrichment delay

I know I've seen information on RPM triggered boost enrichment delay on this forum before, but I can't seem to locate it now. Once upon a time someone out there posted dyno results demonstrating the OEM over-rich condition in the early stages of manifold pressure and how it was resolved by a delay swith to block the pressure signal to the WUR until about 4000 RPM - I think. Does any of this sound familiar?
Old 02-04-2007, 06:31 AM
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It may have been on Rennlist. Try searching for "Brian Leask" or "solenoid"
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Old 02-04-2007, 02:05 PM
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Leask has a device that performs that function.
I would think it to be more advantagous to delay enrichment to a preset boost level instead of a preset rpm. As you know boost onset is a different rpm in different gears and ambient temperatures. Something like 0.4bar might be a good preset for boost reading delay at the WUR.
A quick data log of A/F ratios throughout your operating rpm range will tell you when it hits under those conditions. You can count on greater lag when the intercooler heat soaks or while driving on a hot humid day.
A simple hobs switch will perform that function.
I am going to do this myself very soon and will post all the dyno runs.
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Old 02-04-2007, 07:43 PM
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since we are running too rich in the mid-rpm range, would it be beneficial to dial in more boost in those rpms via a ebc?
Old 02-05-2007, 07:01 AM
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As the CIS meters the air with a flap it will try to compensate for any extra air being forced into the engine. So I doubt it.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 02-05-2007, 01:59 PM
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but won't running higher boost in those "too rich" rpm range will actually lean out the afr curve?
Old 02-05-2007, 02:11 PM
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I don't know for sure. I wouldn't think so.
Why do you think it would ?
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 02-07-2007, 01:51 PM
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Brian Leask has it available with is adjustable wur. http://members.cox.net/930wur/
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Old 02-07-2007, 04:40 PM
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