Planet-9

987.1 No Cruse in 6th after 6speed swap.

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YOUR RESEARCH987.1 No Cruse in 6th after 6speed swap.

Leading reported evidence

Use stock 3.444 ring and pinion

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Performed · outcome unconfirmed
The problem, or as it was explained to me, is that because we used the stock 3.444 ring and pinion for the g86.
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987.1 No Cruse in 6th after 6speed swap.

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Run into this issue, or might have a solution

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Suggestion
I figured it certainly couldn't hurt to consult the hive mind and find out if anyone might have run into this issue, or might have a solution.
Original post Read captured discussion
987.1 No Cruse in 6th after 6speed swap.

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Leading evidence: 'Use stock 3.444 ring and pinion' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run into this issue, or might have a solution' (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.

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Run into this issue, or might have a solution

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Suggestion
I figured it certainly couldn't hurt to consult the hive mind and find out if anyone might have run into this issue, or might have a solution.
Original post Read captured discussion
987.1 No Cruse in 6th after 6speed swap.

Use 3.875 final drive

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

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

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Suggestion
(Both of the g87 6speeds use a 3.875 final drive with a .822 double OD for top gear.)
Original post Read captured discussion
987.1 No Cruse in 6th after 6speed swap.

Frequently discussed actions (3)

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Run into this issue, or might have a solution

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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

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Suggestion
I figured it certainly couldn't hurt to consult the hive mind and find out if anyone might have run into this issue, or might have a solution.
Original post Read captured discussion
987.1 No Cruse in 6th after 6speed swap.

Use 3.875 final drive

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
(Both of the g87 6speeds use a 3.875 final drive with a .822 double OD for top gear.)
Original post Read captured discussion
987.1 No Cruse in 6th after 6speed swap.

Use stock 3.444 ring and pinion

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
The problem, or as it was explained to me, is that because we used the stock 3.444 ring and pinion for the g86.
Original post Read captured discussion
987.1 No Cruse in 6th after 6speed swap.

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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.

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

Planet-9: 1 discussions

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Generation: 20261026T055238Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

So after I scattered the internals of the 5speed in my Cayman all over the road, I swapped in a strengthened 6speed out of an 986 Boxster S . Love the box, however it's final drive is quite a bit taller than either the 5 speed or 6 speed Asin's that came in the 987. So the computer simply won't engage the cruse control in 6th. It's fine in every other gear, but in 6th the computer sees the ratio as out of range and won't set or hold a speed. I figured it certainly couldn't hurt to consult the hive mind and find out if anyone might have run into this issue, or might have a solution. Also, because first post, obligatory picture.:

POST 2Original post

Someone with a PIWIS could tell the DME that the car is a 6 speed.

POST 3Original post

Unfortunantly we did that in the original install. The problem, or as it was explained to me, is that because we used the stock 3.444 ring and pinion for the g86. That puts its top gear drive ratio at 2.89 vs the 3.18 top gear drive ratio of the g87. So the computer is seeing that the engine is spinning slower for the speed than is possible for any gear, and faults. (Both of the g87 6speeds use a 3.875 final drive with a .822 double OD for top gear.)

POST 4Original post

Hmm, interesting problem. I think whether it can be solved will depend on where that cruise control programming lives. If it's in the ECU , a custom flash may be able to fix it. If it's in the cruise control module (more likely, I would guess) you might be out of luck. It might be worth contacting Softronic or one of the other flash vendors to see if they have encountered this before.

POST 5Original post

That is actually a really fantasitc idea. I shot them a message, I doubt I will hear anything back before tuesday, but we will see what they have to say on the matter.

POST 6Original post

or maybe a cruise module from a 987-S ... if Scott says that's what the issue is. now that I think of it, lemme look up part numbers to see if there are model differences ... UPDATE - the only thing related to 'cruise' in the catalog was the cruise control switch ... unless that module has a name that didn't translate well I'm guessing that functionality lives in the ECU . Scott Slaussen (sp?) at softronic should be able to give a definitive answer.

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