kst_77

I have a 99 996 C2 that needs a new engine. There is a great 2001 engine available but it is a egas engine. Two questions.

1) Steps to convert my car to e-gas

2) Steps to convert engine to non-egas.

Which one is recommended and easier to do.

Thanks in advance.

Dharn55

I think it is as simple at taking off the E-gas throttle body and installing you non-E-gas throttle body. Everything else is basically the same.

kst_77

Cool.... thank you

Paul 996

Yes, the right way would be take the non-egas parts from your old engine and re-use them on the new engine.

On the old engine that the throttle body off and then also remove the black plastic T shaped plenum that it was bolted to. Simple put those items onto the new engine and it is now non-egas.

This is how my car is running a 2003 3.6L egas motor in a 1999 car.

Thundertub

Paul,
How far up the 996/997 model years do you believe that process would work?
In other words, would it be possible to use a 2005 engine?
I am largely ignorant on these matters, but I believe that after a certain year/model point that the immobilizer electronics would eventually come into play and make it too hard.
Wouldn't you also need to change the ECU?
Just curious about the "newest" engine that could be used for that upgrade.

Macster

Generally things get more difficult if you venture to use an engine that is not from the same MYs as the car.

That is, trying to adapt and 05 engine into a car made in 2002 and earlier -- I think I have MY ranges right -- is more complicated cause the newer engine can have more bells/whistles that the existing controller does not have.

One possible bell/whistle is VarioCam Plus and another is a more complex intake manifold resonance setup. The engine controller "knows" nothing about these can can't control these properly and the engine may not run right and CELs and other problems can arise.

It is possible someone has solved these issues though, but as I said generally things get more difficult...

Sincerely,

Macster.

Paul 996

Based on memory alone and without verifying docs first. I am pretty sure that the 1st generation 997 3.6 motors are mechanically identical to the 2nd generation 996 3.6 motors for the purposes of this discussion adapting to non e-gas.

Edit, There are several proven techniques for using a M96 3.6 in a 1999 non egas car. Later model years all went to egas and different ecus which offered yet different techniques.

I have a general but fading recollection of the later cars but well versed on the options for a 1999 car with DME v5.22 conversion to a 3.6L since that was my car. I looked at all the options available 3 years ago when I was in need and took what I felt was the more "proven at the time" approach with a shop that had verifiable success at doing it (ie my buddy had a car already converted that I could see and touch).

Over the years I have seen some crazy myths put out on Rennlist about this conversion that absolutely baffle me. Cruise won't work, Constant check engine light, won't pass smog, random accessory won't work, etc. Fear, Uncertainty and Doubt.

I am very happy with the conversion going on its 3rd year. No dealer can tell that anything is done via computer unless they go look at the engine case # and pull the cover to look next to my DME. Tuning wise I think that I have a pretty potent car with 299 RWHP, turns a 12.6 in the quarter mile (the single time I took it there) and gets 29mpg cruising at 75mph.

I love the 3.6 engine with it's peaky VC+ kick in the pants, would have loved a 3.8 but the opportunity wasn't there at the time or I would have.

Bottom line, if you need a new engine you have several power plant options with several different approaches to getting it accomplished. Research and ask questions of those who have done if for a living and do seek out prior customer feedback.

Dharn55

Paul

Do you know if they used the newer DME to take full advantage of the VarioCamPlus?

Jake Raby

Converting that engine to non egas is simple...

kst_77

Done, it was really simple. Just one vacuum leak to be fixed and I am all set :-)

Thank you

3dogbrew

Dumb question: egas = Euro gas?

Doug996InKC

egas = "electronic" gas / throttle (year 2000+)
non-egas = "cable" gas / throttle (year 1999)

3dogbrew

Thanks Doug. Contrary to popular myth, I can be taught.

Loren

1999 C2 used DME 5.2.2 - no egas programming
1999 C4 to 2001 (C2 and C4) used DME 7.2 with egas programming.

Might be easier to convert the engine non-egas IMHO.

logray

So is it really that easy?

Just take the T/B and plenum off your '99 M96 and slap it onto a 2001/2002 ish 3.6L?

Going back to Doug's question, how does the 5.2.2 DME deal with VCam+, or does that engine swap it also include a new 7.2 DME (and immo, alarm, instrument, etc... ) ???

What about wiring harness/etc.