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Old 08-06-2011, 05:15 AM   #1
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3.4 Dme

Ladies and Gentlemen,

A long story short,

I have a MY1997 Boxter, I fitted a MY2000 996 3.4 , engine, but ran the car with the standard 2.5 DME, obviousy with reduced power.

There were some "clever" people and I think they blew my 2.5 DME.
I eventually got the car running again with the 3.4 DME(MY 2000), the 996 Security module, and the 996 FOB transponder pil in my key that I purchased with the engine.
The car goes like crazy now and the power is amazing, but, because of the MY 2000 996 security module, a few things do not work.
(obviously the 996 did not have a cabriolet top or remote boot and the frequency of the remote key is different to the security module's frequency?
The security module is from a US car and my car is European/South African..)

The soft top, the remote for the doors and the boot does not open with the remote on the key.

We do not have people in South Africa that can do programming of the DME except for Porsche South Africa,
and they want to replace both the DME and the security module with new ones, charging me a 1/4 of the cars value.

Does any body know where I could possiby buy another DME programmed with my original programming codes?,
or sell me another DME/Security module FOB key combination?

(I do have my car's programming codes for both the security module and the DME)


Regards
Pieter

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Old 08-06-2011, 07:58 AM   #2
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All you need are new remote heads for your keys that match the frequency of your alarm computer and then have someone program them for you.
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Old 08-06-2011, 10:46 AM   #3
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Hi Paul,


Thanks for the reply.

Is the alarm unit not part of the security module?
The security module also control the soft top, does'nt it?
If the 996 did not have a cabriolet then that output to the Boxters soft top is obviously not programmed into the security module?

Do you perhaps know of anybody that could supply me with the equipment?

Regards
Pieter
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Old 08-06-2011, 03:23 PM   #4
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Yes the alarm system and the security module are the same thing, the unit is under the left seat.

The remote control does not operate the top at least on a US car.

No programming of the DME or alarm system is needed for the top to operate using the switch on the dash with the parking brake on and the latch released.

Hope this helps, if you were here with the proper codes and the proper remotes for your keys with the barcode tags, I could do this in a few minutes.
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2001 Boxster bought new. Installed used motor at 89k.
1987 924S. 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...

Last edited by Paul; 08-07-2011 at 04:10 PM.
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Old 08-06-2011, 08:44 PM   #5
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Does the parking brake dash light come on when you pull up the parking brake lever?
If not you may have a bad microswitch. Not uncommon problem. About US$5 at suncoast: http://www.****************************************************.com/product/99661311201.html?Category_Code=POTEBXCM
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Old 08-07-2011, 08:35 AM   #6
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pieter -

you may have even more power available if you haven't hooked up the VarioRAM yet. the 3.4L intake has a resonance flap that opens up around 4k RPMs. it doesn't exist on the 2.5L. your new DME can control this flap; it will add low end torque.
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Old 08-07-2011, 10:21 AM   #7
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Hi Paul, Stroked and Blown and Insite..(It sounds like a band name...lol)

Thanks Paul,
The Top and the door locks does not operate, after the security module change, from the dash buttons either, that is why I think they are all linked to the security module on the European cars? I will have a look at the wiring diagram.
unfortunately I do not have the barcode tags, but I do have:

Learning code,
DME programming code
Remote control code 1
Remote control code 2........why 2?
Ignition lock/alarm system code
Imoboliser serial code
Radio code
Radio Serial number
Transponder code1
Transponder code2
Transponder code3...........why 3?
Imoboliser code.

Stroked and Blow...lol
The car is at another guy's place that is building an equal lengt exhaust system for me so I did not chck the park brake light, I will check it the next time I see my car, probably tomorrow.

Insite,
Yes I did wire in the resonance flap and it functions perfectly. with the 2.5 DME there was a hesitation around the mid range but now it pulls smoothly all the way to 7300 rpm. (before the 2.5 DME limited it at 6800 rpm)
The dyno say I have 180 hp on the wheels @ 5500 feet altitude asl. (Yes we all live here very near the clouds...lol)
Do you perhaps know if this is more or less what the 996 shows on the dyno. I know the engine is rated at 300hp.

Regards
Pieter
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Old 08-07-2011, 10:22 AM   #8
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PS. MY car is also red... Guards Red...lol.
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Old 08-07-2011, 12:48 PM   #9
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" The dyno say I have 180 hp on the wheels @ 5500 feet altitude asl. (Yes we all live here very near the clouds...lol)
Do you perhaps know if this is more or less what the 996 shows on the dyno. I know the engine is rated at 300hp."

Ouch! Sounds like you have a pretty big tuning window still. My bone stock 2.5L is about 175RWHP at 1400' elevation. Only engine mod is a clean air filter and UD pulley.

... also the fast color: Guards Red.
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Old 08-07-2011, 04:19 PM   #10
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Comments below:


Quote:
Originally Posted by PleGrange
Hi Paul, Stroked and Blown and Insite..(It sounds like a band name...lol)

Thanks Paul,
The Top and the door locks does not operate, after the security module change, from the dash buttons either, that is why I think they are all linked to the security module on the European cars? I will have a look at the wiring diagram. The remote does not operate the top.unfortunately I do not have the barcode tags (Remotes cannot be reprogrammed, they are worthless without the tags), but I do have:

Learning code,
DME programming code
Remote control code 1 Only a partial code is given here, these 2 codes cannot be used to program the remotes.
Remote control code 2........why 2? The car originally had two remotes
Ignition lock/alarm system code
Imoboliser serial code
Radio code
Radio Serial number
Transponder code1
Transponder code2
Transponder code3...........why 3? The car came with a valet key (no remote)

Imoboliser code.

Regards
Pieter
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S. 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...

Last edited by Paul; 08-07-2011 at 04:43 PM.
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Old 08-08-2011, 05:21 AM   #11
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Quote:
Originally Posted by Topless
Ouch! Sounds like you have a pretty big tuning window still. My bone stock 2.5L is about 175RWHP at 1400' elevation. Only engine mod is a clean air filter and UD pulley.

he's at 5,500 feet above sea level. at one mile, HP for a normally aspirated engine drops by about 20%. he should be around 195 - 205 RWHP with that engine at that altitude.
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Old 08-08-2011, 07:43 AM   #12
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Quote:
Originally Posted by insite
he's at 5,500 feet above sea level. at one mile, HP for a normally aspirated engine drops by about 20%. he should be around 195 - 205 RWHP with that engine at that altitude.
Hi Kevin,

I was figuring a well oiled 3.4 at sea level to be about 260rwhp and at 5500' to be around 217rwhp. Here is my altitude calc: 5.5 x .03 x 260= 43hp loss. Lots of tuning room if he is only getting 180 now.
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Old 08-08-2011, 08:12 AM   #13
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topless -

your calculations aren't right. you're just assuming a 3% loss for each 1000'. the pressure drop is NOT linear.

the SAE correction equation is:

cf = 1.176 * ((990/Pd)*(Tk/298)^.5)-.176

one over this cf yields the percent power available at that pressure. Pd is the pressure of dry air at altitude, and Tk is the temperature in degrees kelvin.

i'll use 15 degrees C since that's what my altitude pressure tables are calculated for. at 5,500', the pressure of dry air is about 820mb.

if i plug all this into the equation, i get a cf of 1.22 or an HP yield of 82%.

that means that if your assumption of 260RWHP at sea level were used, the HP available at 5,500' asl is 213.

FYI, Raby says he usually sees about 240RWHP from the 3.4L. this would yield 196RWHP at that altitude.
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Old 08-08-2011, 08:14 AM   #14
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Thanks Gentlemen,

I will look into the HP figures.

Regards
Pieter
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Old 08-08-2011, 10:05 AM   #15
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Quote:
Originally Posted by insite
topless -

your calculations aren't right. you're just assuming a 3% loss for each 1000'. the pressure drop is NOT linear.

the SAE correction equation is:

cf = 1.176 * ((990/Pd)*(Tk/298)^.5)-.176

one over this cf yields the percent power available at that pressure. Pd is the pressure of dry air at altitude, and Tk is the temperature in degrees kelvin.

i'll use 15 degrees C since that's what my altitude pressure tables are calculated for. at 5,500', the pressure of dry air is about 820mb.

if i plug all this into the equation, i get a cf of 1.22 or an HP yield of 82%.

that means that if your assumption of 260RWHP at sea level were used, the HP available at 5,500' asl is 213.

FYI, Raby says he usually sees about 240RWHP from the 3.4L. this would yield 196RWHP at that altitude.
Of course you are right that the alt./air pressure relationship is not linear. Your pressure figures are good. I have seen several 996 3.4L dynoed in San Diego between 255-260 rwhp so I think those are good numbers for a healthy motor near sea level. Jake's shop is at 1500' or so, which might explain his numbers. Any way you slice it the OP should have some hidden juice somewhere in that motor even at 5500'.

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