43 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH997 Engine to 996 Swap
Leading reported evidence
Replace /upgrading the wheel sensors
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
He also said you need to change out the ABS to the newer 4 line system, adding a junction block, adding a line, and replacing/upgrading the wheel sensors.
Leading evidence: 'Replace /upgrading the wheel sensors' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace /upgrading the wheel sensors' (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.
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
It seems that Porsche makes many changes from year to year, even in the same model range, the 996 in this case.
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
So, not to discourage you, but be prepared for many incompatibilites and the need to replace harnesses, modules, instruments, etc.
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
There are a few 996s running around with 997 3.8 x51 motors in them.
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
The key is that your shop must have exp doing the swap that you wish to perform and have a plan for each issue ahead of time not as they run into it head first.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace /upgrading the wheel sensors
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
He also said you need to change out the ABS to the newer 4 line system, adding a junction block, adding a line, and replacing/upgrading the wheel sensors.
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
The key is that your shop must have exp doing the swap that you wish to perform and have a plan for each issue ahead of time not as they run into it head first.
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.
43 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.
3 acknowledgements have no verified action link; they do not establish a repair result.
Anyone swapped a 997 Mk I engine into a 996 MK II? Besides the crate engine from Porsche, what else do I need to do the swap? Both are E-Gas so I think the harness is the same. Does the ECU need to get swapped too? Anything else?
I don't know anybody who has done the swap you refer to, but my experience with another swap leads me to believe that there will be many costly issues that you will be dealing with.
My swap involved putting a 2004 3.6 X51 engine into a 1999 C4. I had this done by a professional Porsche tuning shop. This would seem to be a straightforward process, since all of the auxillaries (alternator, AC compressor, exhaust system, etc were interchangeable. However, after that, everything went downhill very quickly. It seemed, as we went along, that just about everything else was no longer compatible. Remember, this was just a "newer" 996 engine going into an earlier 996 car.
I had known from the start, that we would be replacing the ECU, and both the rear car and engine wiring harness. Also the pressure air conditioning line from the front condensor to the engine had to be changed. These are costly items, even if you can find used ones from a salvage yard. Muffler brackets had to be changed.
After this, the engine was running, but many "new" incompatibilities emerged. The cruise control did not work. The ABS and PSM did not work. The air conditioning did not work. So, now we needed the 3.6 type of ABS and PSM modules, we needed a 2002-2004 type of instrument panel. We needed a separate circuit and switch to make the AC system work. As you can imagine, the component costs and labor were astronomical.
It seems that Porsche makes many changes from year to year, even in the same model range, the 996 in this case.
So, not to discourage you, but be prepared for many incompatibilites and the need to replace harnesses, modules, instruments, etc. The installation of the engine into the chassis will be the least of your problems.
....Rickker
The swaps are not as scary as everyone thinks. Typically it is recommended to stay within your generation of 911. The 996, 986 interchange well across the years regardless of actual year. Some years are easier than others, but there is a well solved approach to each of those nowadays.
The 997 Gen1 and 987 also interchange well. when you mix 9x7 to 9x6 you have a higher level of issues. It can be done. There are a few 996s running around with 997 3.8 x51 motors in them.
The key is that your shop must have exp doing the swap that you wish to perform and have a plan for each issue ahead of time not as they run into it head first.
I have a 99 car with an 03 3.6 engine. No issues. Cruise, AC, everything works as new and the dealer or smog inspector can't even tell something is done unless I tell them.
I would image swapping something newer into the 99-01 would be the big challenge as it is a non CAN-bus car. Once you get past that, mixing a 996 mk II and 997 mk I should not be that bad. I don't need A/C or cruise so that probably makes it easier. I am intrigued by the fact that the 3.8 X51 is thousands cheaper than the 3.6 X51. The core is more, but the reman is cheaper.
You might want to talk with Phillipj here and on Rennlist. He spent alot of time and money with Roock having a 3.6 put in his car and it turned into a nightmare. He finally sold the car and got a 997. Just thought he might have some insight on this.
Just another alternative to consider: the Mk 1 997's M96 engine is of the same basic design as the 996, including the beloved intermediate shaft. More displacement and lots of improvements for sure. Still, for the money and risk involved in a swap, I wonder if it would be more fun and ultimately a longer term proposition if you rebuilt the original motor?
I'm all for building 'outlaws', but if it was me I'd be tempted to upgrade the original powerplant. When it's good, it's very very good.
You should contact 'Tholyoak' either on this forum, or at Renntech. He has thrown many motors into his Boxsters and knows the realities of what it takes to make them work. Here's a thread on Renntech where he put a 3.6 X51 into a Boxster...
http://www.renntech.org/forums/index...pic=15712&st=0
Its looking like a 997.1 motor into a 996.2 is just install and flash. The harness is the same, both are CAN-bus and Motronic 7.8 DMEs. This might work.
sounds like something that happened to me in a different kind of car, doing a motor swap and a performance modification. In short, what I feel like to this day, is that when you spend $20K+ on a mod that is supposed to make you happy in the end is spending much dollars to ruin a car that apparently was better prior to the change. Now my Benz is not even operable and reliable. The worse thing about it is that it upsets you it probably would be more trouble to put it back to it's original form and you're so pissed you rather just get rid of the car so you're never reminded again.
I thin a lot of owners would like to hear more details on your swap. How did you deal with the 7.2 DME/VarioCam to 7.8 DME/VarioCamPlus issue? Or maybe your 99' was a 5.2DME cable throttle. How about the difference in the fule system (no return line)? MOre details please.
bump any updates? my motor blew , have a chance to get a used 3.8 from an 09 911 for 3k. what else is needed besides the motor? will it work with my 02 auto tranny?
09 motor is a different engine entirely. I think it would be very difficult to swap. That being said if you can get an 09 motor for 3K, do it and sell it for twice that so you can fix yours.
First things first sorry for reviving an ancient thread. I am looking at purchasing a 2000 996 roller with no transmission or engine. I am also wondering what porsche engine I can drop in easily??? Any help is greatly appreciated.
Could you post details of how difficult it is, a ball park in relation to the cost and the difference in performance and reliability please.
I am considering a 3.4 to 3.7 rebuild, which will see around 360bhp, cost is circa $19k
Would be interested in the cost & reliability of the 3.8, particularly given the X51 sees 380bhp.
380 in a lightweight 996.1 would be sweet, 300bhp on track is becoming tiresome!
Easily? A stock 3.4 will be the only easy drop in.
Anything bigger/newer involves more complexity and cost. If it is a C2, even a 3.6 isn't an easy one (slightly easier if you have a C4).
For anyone "putting an <insert engine size here> engine" in their car, please clarify whether it is you actually turning wrenches and sorting through the details, overcoming hurdles and complexities, or if it is a professional workshop doing it on your behalf. Paying to have someone else figure it out is a whole different kind of project than doing it yourself.
Oh, and either way, bring your wallet. Even the low end cost wise - salvage engine and transmission, DIY - is in a whole different universe cost wise than any other automobile I've owned.
This job is requiring new ECU, Cluster and harness rewiring done by Dundon Motorsports. THey are documenting all of the work and will post a thread once it is done. It is costly but not much more then your rebuild depending on what you get the 997 engine for. However, I am also putting in a fully custom exhaust, rebuilding calipers and also putting in all aluminum radiators and some other stuff "while you are in there". I am hoping when done I will have about 400-420 HP. I think even my ABS will be upgraded and I might even get additional nannies in the swap.
I looked into doing it before I put a 3.4 back into my car. If you google around you can find people who have gone the DIY route on the 997 into the 996.
I’ve corresponded within one guy who did it successfully, and is happy with it. You have to be pretty committed if you want to do it. You need to upgrade significantly more than just the engine
On a 996.1 C2 like my (and the OPs) 2000, we would need the engine, interior wiring harness, DME, and instrument cluster. Then you need to upgrade the fuel system to a returnless setup. He also said you need to change out the ABS to the newer 4 line system, adding a junction block, adding a line, and replacing/upgrading the wheel sensors.
Apparently, there are ways around swapping out the cluster, but it involves pin swapping and other shenanigans not for the faint of heart. If you don’t do one or the other, the climate control won’t work (if I remember correctly).
C4 owners have a leg up since they already have the newer ABS.
At that point, depending upon where you live you may be in an interesting situation with the motor vehicle department since you have an instrument cluster and computer whose vin and mileage don’t match your chassis (or, as in my case, lower than the title would read). Not sure what happens when there is a discrepancy like that. In my state, it needs to be disclosed at the sale, and is flagged by the DMV, and I believe called out on the next owner’s title.
In short, it sounds like a quick route to more displacement and horsepower, but as best I can tell, there is a lot more to it than meets the eye.
About 10+ years ago, ***** from FVD dropped a 997 engine into a Boxster.
A huge number of issues followed, which prompted ***** to ship the car to Germany to get it sorted out. I drove it afterwards - once - and it was a very nice driver.
Yes, everything you state is correct...these are all things I am having done. In fact, I am also having the instrument cluster moved forward to match my miles of the old instrument cluster. I was not aware of the VIN though which I will look into. However, I will likely never sell this car since my late friend Bruce Leven (Porsche legend) signed the car and also is the inspiration for me doing this in the first place.
Can't wait to have the car finished!
Why do people cash out their retirements for get rich quick schemes? I don't even know what he was promising them, but why on earth would anyone do that? There needs to be a "how not to lose your retirement" classes taught mandatory in every high school...
