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How Slow Can You Go?


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What is the appropriate minimum RPM for the 996 manual transmission in gears 2 through 6?

I assume first gear has no minimum other than the kill factor at about 1k RPM.

Does the minimum RPM change for each gear after operating temperature is reached?

The reason I asked is that I read somewhere (can't remember where, exactly) that lugging the motor contributes to RMS and IMS leakage and failure. Any truth to that either?

Thanks for your replies

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What is the appropriate minimum RPM for the 996 manual transmission in gears 2 through 6?

I assume first gear has no minimum other than the kill factor at about 1k RPM.

Does the minimum RPM change for each gear after operating temperature is reached?

The reason I asked is that I read somewhere (can't remember where, exactly) that lugging the motor contributes to RMS and IMS leakage and failure. Any truth to that either?

Thanks for your replies

I think low-speed lugging was only a concern with the flat-four Carrera motors with roller bearing cranks. I keep my revs between 3K and the redline, and so far, it's been oil leak and explosion free.

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  • 2 weeks later...

Something I read, somewhere, suggested the RMS and/or IMS seal issues occur with the 996 flat 6 engine incident to slower speeds. So, I'm wondering how many RPMs are too few, or too few to begin a hard acceleration from, in any gear. I'll be surprised there's not some guideline on this.

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Something I read, somewhere, suggested the RMS and/or IMS seal issues occur with the 996 flat 6 engine incident to slower speeds. So, I'm wondering how many RPMs are too few, or too few to begin a hard acceleration from, in any gear. I'll be surprised there's not some guideline on this.

There was a post suggesting that those who run their cars in competition events don't have the problem. That's all the excuse I needed to drive the bejeezus outta mine! On a percentage basis, IMS/RMS failures are actually rare. Do a search; the subject has been thoroughly covered before.

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Something I read, somewhere, suggested the RMS and/or IMS seal issues occur with the 996 flat 6 engine incident to slower speeds. So, I'm wondering how many RPMs are too few, or too few to begin a hard acceleration from, in any gear. I'll be surprised there's not some guideline on this.

There was a post suggesting that those who run their cars in competition events don't have the problem. That's all the excuse I needed to drive the bejeezus outta mine! On a percentage basis, IMS/RMS failures are actually rare. Do a search; the subject has been thoroughly covered before.

According to this article http://www.lnengineering.com/ims.html It may be beneficial to keep the revs above 2500.

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