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My 35 year old leather sofa is really really comfortable. I must like you guys to get out of it to take this data...
Here is tonight's run with injector time & duty cycle added 3.6L 2002 95.6k miles 6909 rpm 230 g/s MassAirFlow(HFM)(calc) 828 kg/hr MassAirFlow(HFM)
14.77mS Injection time
85.0% Injector Duty Cycle 55F Intake 94 mph 42F Ambient 69% RH 550 ft 29.85 inHg
From my extremely short reading on duty cycle, 85% seems to be the target max. So I guess I'm happy.
Road was a bit busy tonight. I only made the one pull in 3rd gear
Here are the numbers for max RPM in 2nd gear 6996 rpm 232 g/s MassAirFlow(HFM)(calc) 835 kg/hr MassAirFlow(HFM)
15mS Injection time
87.0% Injector Duty Cycle 74F Intake 65 mph 42F Ambient 69% RH 550 ft 29.85 inHg
At idle, 700rpm, the injection time is 2.36 to 2.39mS so the duty cycle is 1.3-1.4%
You will notice the difference in IAT between 2nd and 3rd gear. The engine compartment cools significantly when above 65mph. I expect this is due to the spoiler opening up. Semi-educated WAG.
I'm still always amazed at how strong this car pulls through the gears. I don't know how racers keep from over revving these engines. The power keeps going.
My 35 year old leather sofa is really really comfortable. I must like you guys to get out of it to take this data...
Here is tonight's run with injector time & duty cycle added 3.6L 2002 95.6k miles 6909 rpm 230 g/s MassAirFlow(HFM)(calc) 828 kg/hr MassAirFlow(HFM)
14.77mS Injection time
85.0% Injector Duty Cycle 55F Intake 94 mph 42F Ambient 69% RH 550 ft 29.85 inHg
From my extremely short reading on duty cycle, 85% seems to be the target max. So I guess I'm happy.
Road was a bit busy tonight. I only made the one pull in 3rd gear
Here are the numbers for max RPM in 2nd gear 6996 rpm 232 g/s MassAirFlow(HFM)(calc) 835 kg/hr MassAirFlow(HFM)
15mS Injection time
87.0% Injector Duty Cycle 74F Intake 65 mph 42F Ambient 69% RH 550 ft 29.85 inHg
At idle, 700rpm, the injection time is 2.36 to 2.39mS so the duty cycle is 1.3-1.4%
You will notice the difference in IAT between 2nd and 3rd gear. The engine compartment cools significantly when above 65mph. I expect this is due to the spoiler opening up. Semi-educated WAG.
I'm still always amazed at how strong this car pulls through the gears. I don't know how racers keep from over revving these engines. The power keeps going.
Yep, almost 20F difference. That's why I keep my spoiler deployed all the time (plus I like the looks of it deployed YMMV). the factory air box takes a while to cool off after it gets heated up. My Custom Short Ram cools quickly at 40mph as there is no hot plastic in close proximity and all the hot air exits the bottom of the engine compartment at 40mph and above.
The "Banshee Scream" I get from my Custom Short Ram with the "Sound Enhancer" added from 6K up makes me want to not stop revving all the time , I want to take it to 10k !!
Getting off the 35 year old leather sofa to post Data is good for your Health !!!
Yep, almost 20F difference. That's why I keep my spoiler deployed all the time (plus I like the looks of it deployed YMMV). the factory air box takes a while to cool off after it gets heated up. My Custom Short Ram cools quickly at 40mph as there is no hot plastic in close proximity and all the hot air exits the bottom of the engine compartment at 40mph and above.
The "Banshee Scream" I get from my Custom Short Ram with the "Sound Enhancer" added from 6K up makes me want to not stop revving all the time , I want to take it to 10k !!
Getting off the 35 year old leather sofa to post Data is good for your Health !!!
I built a dozen of these in 2011 (before my heart issues). The "Sound Enhance" does the opposite of the Helmholtz resonator, instead of quietening the intake, it enhances it.. I got them from Keet Boon who was the Inventor and works for Mann+Hummel ( the big Kahuna in factory intake systems). The Custom Aluminum MAF Housings were made by a guy in Michigan who does aluminum fab work (to my specs).The Dual Cone Filter and the Rubber Elbow are off-the-shelf stuff; I made the clear Lexan shields (heated and bent/formed) , made some from aluminum, but I liked the see-through Lexan ones best..The sound is INCREDIBLE. especially on a 3.8 liter M96/7 !! It's best to used with stock exhaust , a loud exhaust interferes to me. Was a PITA to install, not a quick DIY like installing a K&N , Evoms , Fabspeed .
The "Banshee Scream".. Aluminum "Banshee Screamer"
Last edited by Porschetech3; 01-26-2021 at 04:54 PM.
I built a dozen of these in 2011 (before my heart issues). The "Sound Enhance" does the opposite of the Helmholtz resonator, instead of quietening the intake, it enhances it.. I got them from Keet Boon who was the Inventor and works for Mann+Hummel ( the big Kahuna in factory intake systems). The Custom Aluminum MAF Housings were made by a guy in Michigan who does aluminum fab work (to my specs).The Dual Cone Filter and the Rubber Elbow are off-the-shelf stuff; I made the clear Lexan shields (heated and bent/formed) , made some from aluminum, but I liked the see-through Lexan ones best..The sound is INCREDIBLE. especially on a 3.8 liter M96/7 !! It's best to used with stock exhaust , a loud exhaust interferes to me. Was a PITA to install, not a quick DIY like installing a K&N , Evoms , Fabspeed .
The "Banshee Scream".. Aluminum "Banshee Screamer"
Very clean set up, did you use a GT3 throttle body? Think I'm going to do the 997 airbox, and IDP plenum w/GT throttle body. It's nice to see more exotic set ups from time to time.
Very clean set up, did you use a GT3 throttle body? Think I'm going to do the 997 airbox, and IDP plenum w/GT throttle body. It's nice to see more exotic set ups from time to time.
Thanks, was a fun project..No GT3 throttle bodys, those pictured were 997 3.8 "S" models and were the best sounding, all it took was a road test to hear it and you would want it, all the cars are local.
Last edited by Porschetech3; 01-26-2021 at 07:34 PM.
Yep, almost 20F difference. That's why I keep my spoiler deployed all the time (plus I like the looks of it deployed YMMV). the factory air box takes a while to cool off after it gets heated up. My Custom Short Ram cools quickly at 40mph as there is no hot plastic in close proximity and all the hot air exits the bottom of the engine compartment at 40mph and above.
The "Banshee Scream" I get from my Custom Short Ram with the "Sound Enhancer" added from 6K up makes me want to not stop revving all the time , I want to take it to 10k !!
Getting off the 35 year old leather sofa to post Data is good for your Health !!!
On the 996 Turbo, a lot of people who make big power seem to have a tendency to ruin MAF sensors. One theory is that these sensors max out at around 500 g/s. A lot of us just go to a MAF-less tune to get around this. On the 997 Turbo Porsche went to a dual MAF setup (one for each cylinder bank). Those of us with MAF-less tunes get to have fun noise maker intakes as well, such as filters on turbos or fender well intakes. My car sounds like a jet engine.
I’d do this if know exactly what software to get for an iPhone and what cable or bluetooth device to plug in. I’m technologically challenged but the results aren’t so hard to wrap my head around.
"MAF-Less" engine control systems are named either Speed Density Systems, or Alfa-N Systems. They are less sophisticated than "Mass Air Flow Systems" but are easier to Customize to run huge injectors and high boost pressures by manipulating values, a MUST for a very radical custom engine, also like you said more freedom for intake arrangements !!
From jdbornem's post 234 you can see that my original MAF numbers were on the lower end of the range for the 3.6L measurements. Being a stupid competitive male, I needed to try to improve this. So I cleaned the MAF and retook the data. As you can see, the airflow reading increased and the injector time changes along with it. I don't have any records for when the MAF was last replaced or cleaned. I would assume it's never been done. The car hasn't thrown any codes to indicate a problem. This was done simply to generate contrasting data. I would guess the small change seen, 3-4%, is likely a normal contamination decrease that is seen when running in clean air environments. One concerning point is the injector duty cycle. 95.5 seems a bit high. I did reset the trims a short time before this run, 15 minutes. Depending on how fast the computer learns, this may be a factor in the injector timing...
The cost of getting this new set of data was a few extra counts on the overrev counter 1. I never run the car close to redline, except for these tests, and from now on won't.
We didn't have rev limiters when I was growing up. You would twist the motor until the power fell off, then shift to get back into the power. If you forgot to shift, the next thing would be "valve float" to intervene to stop the motor from turning up..
My 2.0 liter 525hp Race motor I built back in '86, I had to limit the RPM's to 11.5Krpm, I couldn't keep the flywheel bolted on past 12K .. !!!!
Update for new headers, 997 airbox, Soler throttle body and removed screens from deck lid. Runs today, 1 and 2 nearly identical. 2 pulls per run. All 4 runs peaked above 921 kg/hr at 7,000-7,200 rpm. 3rd gear. Durametric data.
3.8L rebuilt with Nickies, some head work, etc ; with 200 cell TG cats, Soler throttle body enhancements, Agency headers? (the ones on sale cheap last year), TG mild sport cans and Softronics tune. Helmholz delete, 997 airbox. 5w40 oil. Optimum engine and oil temp.
01-25-2021, 09:30 PM
