Here's the new transplant brain and heart(s) for the 2.8 induction mods
05-06-2003, 05:58 PM
#1
AudiWorld Super User
Thread Starter
Here's the new transplant brain and heart(s) for the 2.8 induction mods
<center><img src="http://pictureposter.audiworld.com/711/enginemgmt.jpg"></center><p>
Just a pic of the kit to whet yer whistle. AFC-2 is capable of a LOT more adjustability than I'm likely to put it through. It would be better suited to all my mods plus cams, ported/polished intake, big valve heads, pistons, et al. But I liked the "while-you-drive" adjustability in all 4 RPM modes, ie; low, mid-range, high and acceleration.
The O2 sensor on the left is the Split Second stabilized one with signal ground. I think I'm going to wire it direct into the old O2 sensor's plug so there's no crimped or soldered joints... just like factory/OEM replacements.
The install for all this is scheduled to begin on Monday. But before I put in the RC injectors I'm going to experiment with stock injectors a few days to determine need/benefit of larger injectors. Plus it'll help me define pre-set calibrations for those that follow suit but don't go the larger injector route immediately or ever. Least this way I'll have known-good initial pre-sets to share with people running my induction system with stock injectors.
Later I'll chart the pre-sets for 195cc/min injectors both by seat-of-pants and dyno numbers.
Just a pic of the kit to whet yer whistle. AFC-2 is capable of a LOT more adjustability than I'm likely to put it through. It would be better suited to all my mods plus cams, ported/polished intake, big valve heads, pistons, et al. But I liked the "while-you-drive" adjustability in all 4 RPM modes, ie; low, mid-range, high and acceleration.
The O2 sensor on the left is the Split Second stabilized one with signal ground. I think I'm going to wire it direct into the old O2 sensor's plug so there's no crimped or soldered joints... just like factory/OEM replacements.
The install for all this is scheduled to begin on Monday. But before I put in the RC injectors I'm going to experiment with stock injectors a few days to determine need/benefit of larger injectors. Plus it'll help me define pre-set calibrations for those that follow suit but don't go the larger injector route immediately or ever. Least this way I'll have known-good initial pre-sets to share with people running my induction system with stock injectors.
Later I'll chart the pre-sets for 195cc/min injectors both by seat-of-pants and dyno numbers.
05-06-2003, 06:02 PM
#3
AudiWorld Super User
Thread Starter
Injector balance/calibration and flow report...
<center><img src="http://pictureposter.audiworld.com/711/flowsheet.jpg"></center><p>This flowsheet comes with every set of RC Engineering injectors.
05-06-2003, 07:28 PM
#4
How much did all of that set you back?
I remember you saying the injectors were $100 a piece but don't remember if you said how much the AFC-2 was. Can't wait to see the results!
05-06-2003, 08:05 PM
#5
AudiWorld Super User
Thread Starter
List is $1239+ shppg. I got it all for $1070 with my discount...
I plan on offering it at my cost to Stage 2+ TB buyers. Helps offset the cost of the TB by $169. Every little bit helps.
05-06-2003, 08:35 PM
#6
That's a spicy meatball!
That's a lot of money. I am interested in seeing how it turns out. Maybe you'll let me dyno it for you? I think you'll be getting this mod back though (at least for now). =)
05-06-2003, 09:09 PM
#7
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For your info, the stock injectors will produce up to 230 hp . . .
however, that's running them between 87-96% of capacity and assuming a BFSC between .45-.5.
Lloyd at TDL tried using 260cc/min injectors at various pressures and it just choked the engine. Went back the the 172cc/min stockers at 4+ Bar (200cc+/min) and the car worked great.
Thus, your idea of only incrementally going up is the right one. I will wait to see if I can max out my stock injectors with my mods and do the injectors last. (Based on Lloyd's experiences, I was thinking about the same size: 200's with higher pressures if I need them, as the stock ECM likely cannot handle big changes in flow rates without tripping up the programming).
I also await your results, perhaps your experience can help guide the way. Good Luck!!!
Lloyd at TDL tried using 260cc/min injectors at various pressures and it just choked the engine. Went back the the 172cc/min stockers at 4+ Bar (200cc+/min) and the car worked great.
Thus, your idea of only incrementally going up is the right one. I will wait to see if I can max out my stock injectors with my mods and do the injectors last. (Based on Lloyd's experiences, I was thinking about the same size: 200's with higher pressures if I need them, as the stock ECM likely cannot handle big changes in flow rates without tripping up the programming).
I also await your results, perhaps your experience can help guide the way. Good Luck!!!
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05-07-2003, 04:25 AM
#10
I don't agree.
I really don't think the stock injectors will support 230HP. In fact, by my calculations, the stock injectors running at stock fuel pressure will only support 174HP at an 80% duty cycle.
From what I understand, the stock injectors are rated at 157cc/min at a fuel pressure of 43.5psi and are actually run at a fuel pressure of 58psi...effectively making the injectors 180cc/min injectors. Running these same injectors at a fuel pressure of 68psi will effectively yield 196cc/min injectors.
So, plugging the following numbers into the injector worksheet (http://www.rceng.com/technical.htm#WORKSHEET), we come up with the fact that the stock injectors only support xxx HP at 80% duty cycle.
Desired Crank HP: 189
Number of Injectors: 6
BSFC: .475
Max Duty Cycle: .80
Fuel Pressure: 68
Injector size @ 43.5: 157 cc/min
To support 225HP, our injectors would need to be running at a 95% duty cylce and a fuel pressure of 68psi.
Let me know if any of the above looks incorrect.
Scott
From what I understand, the stock injectors are rated at 157cc/min at a fuel pressure of 43.5psi and are actually run at a fuel pressure of 58psi...effectively making the injectors 180cc/min injectors. Running these same injectors at a fuel pressure of 68psi will effectively yield 196cc/min injectors.
So, plugging the following numbers into the injector worksheet (http://www.rceng.com/technical.htm#WORKSHEET), we come up with the fact that the stock injectors only support xxx HP at 80% duty cycle.
Desired Crank HP: 189
Number of Injectors: 6
BSFC: .475
Max Duty Cycle: .80
Fuel Pressure: 68
Injector size @ 43.5: 157 cc/min
To support 225HP, our injectors would need to be running at a 95% duty cylce and a fuel pressure of 68psi.
Let me know if any of the above looks incorrect.
Scott