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996 Mod to 3.6L GT3 motor.

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH996 Mod to 3.6L GT3 motor.

Leading reported evidence

Test with the obdii system

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

Great points,...I did not even raise the spectre of emissions and OBDII compliance and more and more States & Municipalities are emissions testing with the OBDII system from the ISO-port.

Original post Read captured discussion
996 Mod to 3.6L GT3 motor.
Read full discussion summary

Leading evidence: 'Test with the obdii system' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test with the obdii system' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 4 captured posts examined · 0 partial discussions

Compare 1 other evidence results

Use gt-3 tranny

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

To install any of the GT-3 3.6 litre engines, you must use the GT-3 tranny.

Original post Read captured discussion
996 Mod to 3.6L GT3 motor.
Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Test with the obdii system

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

Great points,...I did not even raise the spectre of emissions and OBDII compliance and more and more States & Municipalities are emissions testing with the OBDII system from the ISO-port.

Original post Read captured discussion
996 Mod to 3.6L GT3 motor.

Use gt-3 tranny

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

To install any of the GT-3 3.6 litre engines, you must use the GT-3 tranny.

Original post Read captured discussion
996 Mod to 3.6L GT3 motor.
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I am thinking of pulling my 3.4L motor out and putting the GT3 3.6L motor in my car. I heard a company in Germany, FVD, can do it. Does anyone have any advice on this. I have a 1999 996. I need constructive advice. Don't just tell me that it won't work. I know it will work, but i want to get the full extent of the modifications that u may think would be necessary, and also the possible problems, that would require attention. I appreciate your help in advance.

POST 2Original post

I've looked into doing this for some local clients in detail,......... We do have some GT-3's and GT-3R race cars here. To install any of the GT-3 3.6 litre engines, you must use the GT-3 tranny. The 996 tranny will not mate with the GT-3 3.6 at all. There are many electrical, cooling plumbing, and axle issues. Its very doable but NOT cheap. I advised both of the clients who wished us to perform this conversion to buy a GT-3 instead. Its MUCH cheaper and you will not be stuck with a "Frankenstein" car that will have little value aside from the sum of its parts.

POST 3Original post

Steve, Having personally looked into putting a GT3 engine in my 996, I think you gave your clients some good advice. A quick comparison between the GT3 parts manual and a stock 996 pointed out so many differences in wiring harness, cooling, rear axle, etc. that I quickly convinced myself that this was not a good idea. The other problem was that I couldn't find anyone who had actually done one of these conversion and was able to make it street legal in the US. I think the only practical options for those of us in the US who want a GT3-like experience are to buy a GT3 Cup car and use it only on the track (since it isn't street legal) or buy a RUF RGT, if there are any left. Karl

POST 4Original post

Hi Karl: Great points,...I did not even raise the spectre of emissions and OBDII compliance and more and more States & Municipalities are emissions testing with the OBDII system from the ISO-port. This would preclude such a conversion from being street legal and therefore as unlicensable as a GT-3 in many places.

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