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Old 08-20-2003, 03:40 PM   #220 (permalink)
Multiades
vehicular thaumaturgist
 
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Join Date: Apr 2000
Location: Woburn, MA
Drives: 1994 Stealth TT
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Quote:
Originally posted by Innovator
How would making more power solve the problem BTW? This mod does achieve that, but timing that is too advanced is timing that is too advanced.

When you are getting closer to maxing out the injectors, you are showing the ECU very high airflow values. If you are able to show the ECU the same airflow values WITH the negative correction (for uprated injectors) that you were showing it with the stock injectors, you will run the stock timing.

If you add injectors that are 50% larger than stock (compensating with the AFC), then proceed to make 50% more power than stock, the ECU has no idea that there was any change at all.

Now with 50% larger injectors (550cc/min), you do not compensate with the AFC downwards 50% -- you compensate downwards somewhere around 34.54%. In other words the ECU will see:

(100% - 34.54%) = 65.46%

of the airflow going into the engine.

However, 50% more airflow (or 150% of 65.46%) equals approximately 100%, so the ECU will see the same airflow as before the injectors, and will actually be delivering 50% more fuel to the 50% more air coming in.

Hope that is a relatively clear explaination.

-Chris
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Pearl Yellow 1994 R/T TT w/84k - FOR SALE! new 4-Bolt factory short block, DR StgII heads, Titan TD05 headers, 14B turbos w/ ported 7cm^2 housings, 3" minimum-bend catless exhaust, SCE oil pan, RPSII clutch, Fidenza flywheel, OZ F1 Plus 17x9.5" wheels, Kumho Ecsta MX 245/45 tires, Drweldin DSM SMICs, 3SX engine mounts (Maximal solid front), GReddy 60mm P/H/W boost, Carbotech Panther Plus & Bobcat pads w/ slotted/drilled rotors, KSport GT-Pro coilovers, Maximal rear camber arms, SCE balljoints, ABS delete w/ cockpit-mounted Wilwood proportioning valve, AC delete, EGR/evap/dashpot delete, cruise/vacuum-tank delete, '95 Lexan headlights, McCulloch 4300K HIDs, GReddy Type-S BOV, solid shift bushings; Misc Parts: Walbro341, 20# fixed-back seats, Accelerated Moto catch can
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