27 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSlakker 4.1L 996.2 X51 40thAE - Engine Dyno Results
Leading reported evidence
Replace into my sp996
Performed · outcome unconfirmed
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
So I have a 3.4L 996.1 core engine coming in that will be our first 4.1L build and get swapped into my sp996 to get hammered on the track for testing.
Leading evidence: 'Replace into my sp996' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace into my sp996' (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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
The 996.2 X51 intake manifolds appear to be nearly as good as the 997.1S intake manifold which is our favorite we've tested so far.
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
The 996.2 X51 ported heads and X51 intakes with an 82mm plenum and throttle body tested very well with one of our Slakker 3.6L->4.1L rebuild powered by Hartech.
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
Jake has found ways to make much more than that by modifying the non-X51 parts.....takes years of testing/experimenting/expertise to improve on Porsche's production designs...
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 · Original poster
We�ve switched over to using a Motec M130 ecu for testing due to to the better data logging we are getting as well as being able to dial in the tune much quicker.
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
Jake has found ways to make much more than that by modifying the non-X51 parts.....takes years of testing/experimenting/expertise to improve on Porsche's production designs...
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 · Original poster
We�ve switched over to using a Motec M130 ecu for testing due to to the better data logging we are getting as well as being able to dial in the tune much quicker.
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
The 996.2 X51 ported heads and X51 intakes with an 82mm plenum and throttle body tested very well with one of our Slakker 3.6L->4.1L rebuild powered by Hartech.
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 · Original poster
We�ve switched over to using a Motec M130 ecu for testing due to to the better data logging we are getting as well as being able to dial in the tune much quicker.
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.
27 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
The 996.2 X51 ported heads and X51 intakes with an 82mm plenum and throttle body tested very well with one of our Slakker 3.6L->4.1L rebuild powered by Hartech. We�ve switched over to using a Motec M130 ecu for testing due to to the better data logging we are getting as well as being able to dial in the tune much quicker. The 996.2 X51 intake manifolds appear to be nearly as good as the 997.1S intake manifold which is our favorite we've tested so far.
You Tube
The best we've gotten with a '99 3.7L is 340hp tuned for race gas. Normally they are coming in closer to 330. And that's a nice little extra bit of punch for the nimble .1's. But what I'd really like to do is a 996.1 3.4->4.1L conversion. I think we have a game plan for the heads, and we are working on a 996 intake manifold that is more in line with the 997.1S intake. So I have a 3.4L 996.1 core engine coming in that will be our first 4.1L build and get swapped into my sp996 to get hammered on the track for testing.
I figured it had to do with cam profile. The dip is less pronounced than on many of the more stock dyno graphs. Is it coincidental or did Porsche design the air flow profile to go in tandem with the lift programming? Seems to my pedestrian brain those dips could be reduced more with ECU software tweaks without having to go to a more aggressive cam lobe.
Wow, a 4.1 for a 996!....... All I want for Christmas is a better torque curve/bottom end, as I don't track the car but rather drive on mostly backcountry two-lane roads with lots of undulation and curves. My only problem is bottoming out in some areas where the road resembles the lunar landscape. The only time I get any speed is on Rt. 80, and almost everybody drives with their foot in the oil pan.
Looking forward to seeing the results and costs....
I just spotted this x51 intake manifold for sale on Ebay....
https://www.ebay.com/itm/33612525430...0AAeSwy6poniSA
Is this what you need for your 996.1 build?
It's not a direct fit. We need to make an adapter, add a port to the manifold, and then there is an extra 1" of clearance required on top of anything added by the adapter. We are working on a better solution that we are hoping to have available by Q1 of next year.
We have started porting the lower intake runners on the 996 and then port matching where it meets the upper intake manifold. This has shown significant improvement and bought us a little more time. That being said, we are hoping to release our intake manifold before end of year.
Is there actually a non-matching step between upper and lower intakes? I have 2001 3.4L engine out for several service items currently - maybe it would be a good time to pull out the intakes as well and do some intake runner matching...
Speculating here....but 3D printing has really made designing products much faster, more economical and easier. With some know-how you can print pretty complex shapes that would otherwise cost much more if you had to cast them or have to CNC molds. And this is just for the design and testing phase. I assume that many manufacturers, including Porsche, use plastic intake manifolds as they are cheaper to produce and much lighter. The 996 X51 is still a cast piece and you can actually see it, not something you can say in any modern 911 so why worry about that.
'Using 3D printing' can mean that lost wax models are 3D printed but the head itself is cast or anything else along those lines.
3D printing the cil. head means that the whole head is 3D printed, which is not economically viable with the production rate of the S58.
It looks like the original engine was a 996.2 3.6 L with the X51 option, which has cast-Al intake headers, different exhaust headers, and higher-lift camshafts. The Skakker rebuild increased displacement to 4.1 L. What else on the Slakker rebuild options list was used? Pauter rods? Port and polish heads? 8000-rpm springs (I guess that's what 8K means.)?
The X51 Power Kit only delivers 25HP more over the stock 3.6......
Jake has found ways to make much more than that by modifying the non-X51 parts.....takes years of testing/experimenting/expertise to improve on Porsche's production designs...
This is a source reference. Confirm exact model applicability in the original material.
