3.4L Engine RPM at 100MPH?

I'm wondering if someone might be able to share their engine RPM in 6th gear when travelling at 100MPH in a 3.4L 996. Also, if someone knows what a steady speed in 6th gear is at 5,500 RPM that may prove helpful as well. I'm limiting my motor to 5,500 RPM. I'm trying to use this information to help me estimate the top speed of my '99 cab that has almost completed its conversion into an electric car! (You can read more here: https://rennlist.com/forums/996-foru...-my-996-a.html ) I've done some rough 0-60 tests, and I'm pretty close to the stock 5.3 seconds, but still tweaking things out. I have a feeling I'm faster 0-40 than stock. Will do all sorts of testing (fun!) when she's ready!

RPM 1st 2nd 3rd 4th 5th 6th 500 3 5 7 9 10 13 600 3 6 8 11 13 15 700 4 7 10 12 15 18 800 4 8 11 14 17 20 900 5 9 13 16 19 23 1000 6 10 14 18 21 25 1100 6 11 15 19 23 28 1200 7 12 17 21 25 31 1300 7 13 18 23 27 33 1400 8 14 20 25 29 36 1500 8 15 21 26 31 38 1600 9 16 23 28 34 41 1700 10 17 24 30 36 43 1800 10 18 25 32 38 46 1900 11 18 27 33 40 48 2000 11 19 28 35 42 51 2100 12 20 30 37 44 53 2200 12 21 31 39 46 56 2300 13 22 32 40 48 59 2400 13 23 34 42 50 61 2500 14 24 35 44 52 64 2600 15 25 37 46 55 66 2700 15 26 38 47 57 69 2800 16 27 39 49 59 71 2900 16 28 41 51 61 74 3000 17 29 42 53 63 76 3100 17 30 44 54 65 79 3200 18 31 45 56 67 81 3300 18 32 46 58 69 84 3400 19 33 48 60 71 87 3500 20 34 49 61 73 89 3600 20 35 51 63 75 92 3700 21 36 52 65 78 94 3800 21 37 53 67 80 97 3900 22 38 55 68 82 99 4000 22 39 56 70 84 102 4100 23 40 58 72 86 104 4200 24 41 59 74 88 107 4300 24 42 61 75 90 109 4400 25 43 62 77 92 112 4500 25 44 63 79 94 115 4600 26 45 65 81 96 117 4700 26 46 66 82 99 120 4800 27 47 68 84 101 122 4900 27 48 69 86 103 125 5000 28 49 70 88 105 127 5100 29 50 72 89 107 130 5200 29 51 73 91 109 132 5300 30 52 75 93 111 135 5400 30 53 76 95 113 138 5500 31 53 77 96 115 140 Final drive ratio for 996 manual transmission is 3.44. 1st gear: 3.82 2nd gear: 2.20 3rd gear: 1.52 4th gear: 1.22 5th gear: 1.02 6th gear: 0.84 Tire used 285/30/18.

AWESOME - thank you! Where'd you find this? I was searching and searching... I'm guessing you just had it memorized.

The gear ratios are from rennlist/renntech. The RPM/Speed spread is from the tool. Here you go. http://www.f-body.org/gears/

I know for a fact when I am travelling at 80mph in 6th gear my revs are bang on 3000 revs. So I see a differance to the latter posting. I also have 18 inch wheels. Ummm strange. And mine is the 1999 C2 Cabriolet as you have.

Interesting Hurdi... I guess these will have to truly remain estimates and not taken for hard truth. If you get bored on an open stretch of highway, feel free to test further... ha! At this point, using the info above, I can just estimate that my car will easily surpass 120MPH - and could go up to 140MPH... the electric motor doesn't have lots of HP, and gets weaker at the high RPM. I share this info with the engineer leading the build, here's what he had to say: "I really don't know if it will get up to that speed. The engineer in my head wants to get the coefficient of drag for your car's aerodynamic shape at that speed, a the estimated rolling resistance of the tires, and the estimated drag your transmission experiences at that load, and that RPM... but you can see the accuracy of the sum of these estimates is far more challenging than just driving it to find out. So we'll default to that! Hopefully on a track somewhere without ditches and telephone poles. Not to mention police cars lurking in the shadows..." Love it... and can't wait to see!

Quotes source post: 11627122

You are looking at your inaccurate rev counter and speedometer. My numbers are mathematically correct. Porsche is known to overstate the speed on the factory speedometers, so your 80MPH is in fact 76MPH.

LOL - truth be heard... at least now we can understand the discrepancy... so I can let my car say that it has a higher top speed than it really does!

Cant argue the math. LOL

Quotes source post: 11627122

Two things. One is the speedo in these cars is optimistic. An 80mph indicated could very well be 4 or 5 miles per hour lower actual speed. (This is the error my 02 Boxster's speedo has.) The other thing is the tach is optimistic as well. 3K indicated could only be 2900 actual.