Shift point for 15k rpm? - Triumph675.Net Forums
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post #1 of 10 Old 08-11-20, 12:47 Thread Starter
Derrick Wang
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Shift point for 15k rpm?

Hi all,
Got a '12 675r that revs to 15k and I'm trying to figure out what is the best rpm to shift at for fastest acceleration. I've read the other posts out there but there seems to be a discrepancy with what everyone's 675 revs to - some 13.7, some 14, and some 14.5 which will effect what is the best shift point is. I'm the 2nd owner of this bike and got it recently with 2800miles on the clock. The prev owner, to my knowledge, had it reflashed with the arrow map, which I confirmed. Do 2nd gen 675r's come from the factory able to rev to 15, or did the prev owner increase the rev limiter? Also, in terms of shift point, it seems like the consensus is to shift at 14. Any thoughts? Thanks
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post #2 of 10 Old 08-12-20, 00:17
MacBandit
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Either the tach is off or they raised the rev limit. If you donít want to eat the valves and reduce valve wear Iíd suggest lowering it back down to 13,500. The tach and some documents say the rev limit is 14k but the official spec is 13,500.
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post #3 of 10 Old 08-12-20, 11:38
TheBeerHunter
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If this is a track/race bike, use TuneEcu and limit the RPM to 13,250 or you WILL spin rod bearings. Ask me how i know. The Tach's arent particularly accurate. I rely on the shift lights/feel for my shift point.
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post #4 of 10 Old 08-12-20, 17:38
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Are you running the drag strip or something?

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post #5 of 10 Old 08-12-20, 18:15 Thread Starter
Derrick Wang
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Quote:
Originally Posted by MacBandit View Post
Either the tach is off or they raised the rev limit. If you don’t want to eat the valves and reduce valve wear I’d suggest lowering it back down to 13,500. The tach and some documents say the rev limit is 14k but the official spec is 13,500.
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Originally Posted by TheBeerHunter View Post
If this is a track/race bike, use TuneEcu and limit the RPM to 13,250 or you WILL spin rod bearings. Ask me how i know. The Tach's arent particularly accurate. I rely on the shift lights/feel for my shift point.
Gotcha it seems the prev owner raised the rev limit. What rpm are you guys shifting at while at the track?
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post #6 of 10 Old 08-12-20, 18:16 Thread Starter
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Are you running the drag strip or something?
No drag strips. Just track days and highway fun
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post #7 of 10 Old 08-12-20, 18:36 Thread Starter
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Quote:
Originally Posted by MacBandit View Post
Either the tach is off or they raised the rev limit. If you don’t want to eat the valves and reduce valve wear I’d suggest lowering it back down to 13,500. The tach and some documents say the rev limit is 14k but the official spec is 13,500.
Quote:
Originally Posted by TheBeerHunter View Post
If this is a track/race bike, use TuneEcu and limit the RPM to 13,250 or you WILL spin rod bearings. Ask me how i know. The Tach's arent particularly accurate. I rely on the shift lights/feel for my shift point.
I just read in the below thread that the tach reads 9% higher than it actually is. 15k x 91% = 13.65k which I think is about the rev limit i saw on the arrow tune thats on the bike via tuneecu. So if thats all correct, the bike should be fine?

https://www.triumph675.net/forum/sho.../143714?page=2
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post #8 of 10 Old 08-13-20, 10:26
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If he's saying to set the redline in TuneECU to 13,250, he isn't relying on the tach. Setting the RL in TuneECU to 13,650 could mean an expensive engine repair.

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post #9 of 10 Old 08-13-20, 11:42 Thread Starter
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Originally Posted by TTRIgnitionSystems View Post
If he's saying to set the redline in TuneECU to 13,250, he isn't relying on the tach. Setting the RL in TuneECU to 13,650 could mean an expensive engine repair.
Gotcha. I'll recheck the rev limiter in tuneecu to make sure either 13,250. If it's already at 13,250, then that's a big tach discrepancy of 11.2% if the tach still revs to 15k.
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post #10 of 10 Old 08-18-20, 19:06
AussieAdam
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Rev Limit

I have found the Tacho to read about 1G fast. I have my rev limit set at 13500 on my bike and it doesn't hit the limiter until it is showing very close to 14500 on the Tacho.

Last edited by AussieAdam; 08-25-20 at 18:24.
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