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Discussion summary
YOUR RESEARCHTurbo gearbox parts finally arrived
Leading reported evidence
Replace gearing
Performed · outcome unconfirmed
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1
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Read evidence and context
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Performed · outcome unconfirmed · Original poster
I have changed the gearing to give slightly longer gearing in each gear for more relaxed motorway cruising, and a higher first so that it is more useful and the gap from first to second is more reasonable.
Leading evidence: 'Replace gearing' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace gearing' (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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Suggestion · Original poster
I also have a billet cover plate for the gearbox and will be running an oil pump, spray bar, and cooler.
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Suggestion
Can I ask what FD you are using with those ratios?
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Replace gearing
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 · Original poster
I have changed the gearing to give slightly longer gearing in each gear for more relaxed motorway cruising, and a higher first so that it is more useful and the gap from first to second is more reasonable.
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.
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911uk: 1 discussions
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Generation: 20261027T064914Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I am having some upgrades done on my turbo at the moment, slippery slope and all that. These parts have just arrived for it:
It has basically taken me a year from first enquiry to them arriving, but apparently they are very good. I have changed the gearing to give slightly longer gearing in each gear for more relaxed motorway cruising, and a higher first so that it is more useful and the gap from first to second is more reasonable. These have been built as a straight cut gearset to handle extra torque. Also included is a 2 piece mainshaft, and a GT2 PRO LSD to get the power down when the car only has 2WD. I also have a billet cover plate for the gearbox and will be running an oil pump, spray bar, and cooler.
I am hoping that I have reached the bottom of the slope for the gearbox now ïŠ
Gears are:
gear Standard New
1st 3.82 3.17
2nd 2.05 2
3rd 1.41 1.38
4th 1.12 1.04
5th 0.92 0.84
6th 0.75 0.67
MC
I have been told that they aren't all that loud. I wouldn't have done it through choice, but apparently if I want to keep the gears on the shaft with the torque it will produce I have no option.
With a bit of luck you won't hear it over the exhaust
MC
Running the standard final drive. The idea being that if you have free reign over the main 6 ratios you don't need to touch the FD.
The Turbo has the opposite problem to my C4. It has so much torque and power that the gears all seem too short and it ends up doing 3k+ rpm at motorway cruising speeds. The C4 is geared for close to 200mph but for what I want would be better if geared for 130mph. Unfortunately different ratios are not so easily available for the C4.
MC
That's good to hear. When we first starting doing these boxes years ago we had major problems with different shafts available so it is the only one that we know for sure works.
Ken, do you have any clips of a straight cut G96/G97 box from inside the cabin? I know how my Westfield sounds and it isn't nice, but then it's right next to me seperated by a carbon panel. Might be bearable in a Porsche..
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