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RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHRSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Leading reported evidence

Recommend street and track

Suggestion or failed attempt

No successful repair reported for this finding.

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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 · Original poster

Recommended for street and track use

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L
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Leading evidence: 'Recommend street and track' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend street and track' (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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1 matching discussions · 5 captured posts examined · 0 partial discussions

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Run added rss pulley (part #608)

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 · Original poster

Modified Dyno Run: Added RSS Pulley (Part #608) to baseline car with existing mods:

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Run light weight flywheels, engines

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 · Original poster

The RSS Harmonically Damped Underdrive Pulley is ideal for engines that are running light weight flywheels, engines that are built - bored/stroked and stock engines that are driven hard.

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Use /sourcing a new oem crank shaft pulley bolt

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 · Original poster

*NOTE: We recommend using/sourcing a new OEM Crank Shaft Pulley Bolt for your specific vehicle when installing the RSS Pulley.

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Use appropriate length belt rss # 6pk

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 · Original poster

We recommend using the appropriate length belt RSS # 6PK which can also be purchased on our

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L
Frequently discussed actions (5)

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

Recommend street and track

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 · Original poster

Recommended for street and track use

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Run added rss pulley (part #608)

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 · Original poster

Modified Dyno Run: Added RSS Pulley (Part #608) to baseline car with existing mods:

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Run light weight flywheels, engines

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 · Original poster

The RSS Harmonically Damped Underdrive Pulley is ideal for engines that are running light weight flywheels, engines that are built - bored/stroked and stock engines that are driven hard.

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Use /sourcing a new oem crank shaft pulley bolt

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 · Original poster

*NOTE: We recommend using/sourcing a new OEM Crank Shaft Pulley Bolt for your specific vehicle when installing the RSS Pulley.

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L

Use appropriate length belt rss # 6pk

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 · Original poster

We recommend using the appropriate length belt RSS # 6PK which can also be purchased on our

Original post Read captured discussion
RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | 996 3.4L +3.6L
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.

5 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: 20261026T103553Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

RSS | # 608 Harmonically Damped - Underdrive Performance Pulley Kit | (New) Fits 996 3.4L +3.6L | In Stock! Website Link: http://roadsportsupply.com/608-harmo...6-987-996-997/ The RSS Harmonically Damped Underdrive Pulley is ideal for engines that are running light weight flywheels, engines that are built - bored/stroked and stock engines that are driven hard. Improved HP & TQ by reducing drag from the power steering pump, A/C, water pump and alternator without adverse effects on said ancillary systems. Dampens/reduces internal engine harmonics for improved engine performance, efficiency and longevity. Recommended for street and track use Made in USA Fits on all Porsche 986, 996, 987, 997 models EXCEPT 2.9L (multi hole crank pulley pattern), DFI engines, GT2, GT3 and Turbo. Installation tool (wrench) and New OEM Pulley Washer included: Dyno Image shows HP & TQ gain on 2005 997.1 Carrera S: Baseline Dyno Run Mods: OEM Crank Pulley, OEM Software, Cargraphic Headers, Hi flow 200 Cell Cats, and Medium Sound Cargraphic Sport Mufflers Modified Dyno Run: Added RSS Pulley (Part #608) to baseline car with existing mods: +16 HP / +8 ft lbs TQ *NOTE: We recommend using/sourcing a new OEM Crank Shaft Pulley Bolt for your specific vehicle when installing the RSS Pulley. (Not Included with 608 Kit) We recommend using the appropriate length belt RSS # 6PK which can also be purchased on our Website Link: http://roadsportsupply.com/6pk-conti...-kits-601-608/

POST 4Original post

Why not offer a full kit with belt and bolt included?

POST 5Original post

Quotes source post: 15556621

Agreed, good idea... Also, do you have such a chart for your standard underdrive pulley? And, what % diameter reduction are we looking at here? Thanks

This is a source reference. Confirm exact model applicability in the original material.