How high can I safely push my rev limit? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Silver Ignition · 07-25-2017, 08:30 AM

I'm an avid autocrosser so to push my rev limit from 7600 to say 7800 or 8000 would also push my 2nd gear top speed from 62 to possibly 65 or 66.

How high can I safely set my rev limit?

Dakines · 07-25-2017, 09:56 AM

I set it in 8000

majixmatrix · 07-25-2017, 10:22 AM

There are numerous forum posts about this. After a lot of reading, many users said that with our engines there is really no power to be had above 7500 RPM like with an STI or most other cars. I would set it at 7600 RPM like most tunes and call it a day and not risk premature engine failure.

Silver Ignition · 07-25-2017, 10:35 AM

Quote:

Originally Posted by majixmatrix

There are numerous forum posts about this. After a lot of reading, many users said that with our engines there is really no power to be had above 7500 RPM like with an STI or most other cars. I would set it at 7600 RPM like most tunes and call it a day and not risk premature engine failure.

I'm not looking for power as much as I'm looking to NOT hit that 7600 wall...theres times on course when I'm on the soft limit at 7600 for a good 3-5 seconds...3-5 seconds on a 62mph wall

majixmatrix · 07-25-2017, 01:03 PM

Ah I gotcha. A couple people on the previous threads said they didn't want to go higher than 7800 RPM

chaoskaze · 07-25-2017, 02:00 PM

i downshifted into 8200, didn't total my brz....... oh wait wrong thread.

OND · 07-25-2017, 02:15 PM

If you are on redline for long enough to cause significant time loss, you probably have time to shift up and down (even tho shifting down to 2nd is a b.tch sometimes). Otherwise, you arent losing much anyway

You could also try a taller tire like 235/45/17 if it suits your track better?

Freude am Fahren · 07-26-2017, 05:51 PM

If you want a couple MPH, you can try slightly larger tires.

dutchman1 · 07-26-2017, 07:07 PM

Like others have said, tires.

That being said, I'm considering doing the opposite for my car. I'm thinking about trying a 215/45r17 Rival S 1.5 on a 16x7.5 (the 2017s can run 7.5" in street class) next year. With the 2017's gearing I can only go 57 in 2nd, so on fast courses I have to shift anyway. With the smaller tires that'd drop to 54.5, but I'd have a 5% gearing advantage, be 2lbs lighter a corner, and sit .7" lower than a 225/45r17. I think the good would outweigh the bad, as long as I don't blow too many shifts.

Not a direct answer to your question, but food for thought.

07-26-2017, 05:51 PM	#8
Freude am Fahren Senior Member Join Date: Jan 2013 Drives: '13 DGM BRZ Limited/'14 Yamaha R6 Location: SoFlo Posts: 333 Thanks: 46 Thanked 96 Times in 64 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	If you want a couple MPH, you can try slightly larger tires. __________________ -XXR 527 18x8.75 +35 -Nameless 2.5" OP/FP Combo (Coming soon) & Axleback -SBD 500X (Waiting on coating to install) -Southbend SBD500X Clutch

07-26-2017, 07:07 PM	#9
dutchman1 Senior Member Join Date: Nov 2016 Drives: 2017 86 6-Speed Location: Seattle Posts: 138 Thanks: 35 Thanked 74 Times in 36 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Like others have said, tires. That being said, I'm considering doing the opposite for my car. I'm thinking about trying a 215/45r17 Rival S 1.5 on a 16x7.5 (the 2017s can run 7.5" in street class) next year. With the 2017's gearing I can only go 57 in 2nd, so on fast courses I have to shift anyway. With the smaller tires that'd drop to 54.5, but I'd have a 5% gearing advantage, be 2lbs lighter a corner, and sit .7" lower than a 225/45r17. I think the good would outweigh the bad, as long as I don't blow too many shifts. Not a direct answer to your question, but food for thought. __________________ 2017 86 set up for CS STX autocross

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07-25-2017, 09:56 AM	#2
Dakines Member Join Date: Feb 2016 Drives: BRZ Location: Kolia Posts: 12 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I set it in 8000

07-25-2017, 10:22 AM	#3
majixmatrix BRZ Wannabee Join Date: Jan 2017 Drives: 2013 Limited BRZ Location: Worcestor, MA Posts: 94 Thanks: 4 Thanked 4 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	There are numerous forum posts about this. After a lot of reading, many users said that with our engines there is really no power to be had above 7500 RPM like with an STI or most other cars. I would set it at 7600 RPM like most tunes and call it a day and not risk premature engine failure.

07-25-2017, 01:03 PM	#5
majixmatrix BRZ Wannabee Join Date: Jan 2017 Drives: 2013 Limited BRZ Location: Worcestor, MA Posts: 94 Thanks: 4 Thanked 4 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Ah I gotcha. A couple people on the previous threads said they didn't want to go higher than 7800 RPM

07-25-2017, 02:00 PM	#6
chaoskaze The Fail Boat Join Date: Aug 2011 Drives: CWP S.B. Location: LasVegas Posts: 3,028 Thanks: 4,718 Thanked 1,293 Times in 873 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	i downshifted into 8200, didn't total my brz....... oh wait wrong thread.

07-25-2017, 02:15 PM	#7
OND Senior Member Join Date: May 2016 Drives: 2023 BRZ Location: Houston, TX Posts: 208 Thanks: 174 Thanked 219 Times in 90 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	If you are on redline for long enough to cause significant time loss, you probably have time to shift up and down (even tho shifting down to 2nd is a b.tch sometimes). Otherwise, you arent losing much anyway You could also try a taller tire like 235/45/17 if it suits your track better?

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