Late rpms - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Diz86x · 11-08-2015, 05:35 AM

When i push the pedal to the max it lags at 7k rpm. Anyone know a solution or whats the reason ? Help

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Tcoat · 11-08-2015, 10:04 AM

In what gear? At what speed? Sitting at a stop in neutral? What are the circumstances and what do you mean it "lags"?
You question is totally unanswerable with the info you have provided.

Captain Snooze · 11-08-2015, 04:54 PM

Quote:

Originally Posted by Diz86x

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I don't understand how this is related to your "late rpms" issue.

Tcoat · 11-08-2015, 05:16 PM

Quote:

Originally Posted by Captain Snooze

I don't understand how this is related to your "late rpms" issue.

In his defense that line does contain as much valuable information about his issue as the rest of the post.

Clipdat · 11-08-2015, 05:53 PM

Honey, I think we might be having a family sooner than we thought... my rpms are late.

jvincent · 11-08-2015, 05:59 PM

I am good at deciphering cryptic noob.

I think the OP is talking about the fuel cut / rev limiter. On the stock ECU program it is very intrusive and kicks in really hard. If you are running on OFT tune it is much more gradual.

ryoma · 11-08-2015, 06:05 PM

the solution is to shift to the next gear lol

JB86'd · 11-08-2015, 06:42 PM

well this engine stock starts to lose power at 7k, AND has a hard rev limiter at 7400..I set my shift light/beep to 7100 and call it a day

churchx · 11-08-2015, 08:55 PM

Well, even if this engine produces less power at higher rpms, it makes sense to not gear up too quick to get most out of car & engine:
Just 10% less power & torque at top rpms than that of at peak is way more powerful at lower gear due different gearing ratio in transmission then too hastily switched gear up at lower rpms and less favorable gearing ratio of next gear. I'd gear up sooner only on 1st, when redline nears so fast, that it's easy to hit hard rev limit and loose some acceleration due stagger from ecu cutting power in very abrupt way.

humfrz · 11-08-2015, 11:19 PM

Quote:

Originally Posted by jvincent

I am good at deciphering cryptic noob.

I think the OP is talking about the fuel cut / rev limiter. On the stock ECU program it is very intrusive and kicks in really hard. If you are running on OFT tune it is much more gradual.

I think you're right about the situation being related to the rev limiter.

I would suggest to the OP that he set the shift light to about 6,500 rpms ..... that way, the engine will most likely get shifted before it hits the fuel cutoff point.

Personally, I set mine at 6,000 rpms ........ cause it takes me a while to see the light and react ......

humfrz

11-08-2015, 05:35 AM	#1
Diz86x Member Join Date: Jan 2015 Drives: GT86 Nur spec Location: oman Posts: 45 Thanks: 12 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Late rpms When i push the pedal to the max it lags at 7k rpm. Anyone know a solution or whats the reason ? Help Sent from my iPhone using Tapatalk

11-08-2015, 10:04 AM	#2
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,285 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	In what gear? At what speed? Sitting at a stop in neutral? What are the circumstances and what do you mean it "lags"? You question is totally unanswerable with the info you have provided. __________________ Racecar spelled backwards is Racecar, because Racecar.

11-08-2015, 06:05 PM	#7
ryoma Senior Member Join Date: Mar 2015 Drives: 2015 Subaru BRZ Limited CWP Location: SoCal Posts: 1,561 Thanks: 34 Thanked 669 Times in 469 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	the solution is to shift to the next gear lol __________________ My 2015 CWP BRZ Build

11-08-2015, 06:42 PM	#8
JB86'd Senior Member Join Date: Oct 2013 Drives: JAWS Location: socal Posts: 703 Thanks: 753 Thanked 437 Times in 224 Posts Mentioned: 27 Post(s) Tagged: 1 Thread(s)	well this engine stock starts to lose power at 7k, AND has a hard rev limiter at 7400..I set my shift light/beep to 7100 and call it a day __________________

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11-08-2015, 05:59 PM	#6
jvincent Senior Member Join Date: Sep 2013 Drives: 2022 WRB BRZ Sport-Tech Location: Ottawa, Canada Posts: 1,746 Thanks: 131 Thanked 1,410 Times in 715 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	I am good at deciphering cryptic noob. I think the OP is talking about the fuel cut / rev limiter. On the stock ECU program it is very intrusive and kicks in really hard. If you are running on OFT tune it is much more gradual.

11-08-2015, 08:55 PM	#9
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Well, even if this engine produces less power at higher rpms, it makes sense to not gear up too quick to get most out of car & engine: Just 10% less power & torque at top rpms than that of at peak is way more powerful at lower gear due different gearing ratio in transmission then too hastily switched gear up at lower rpms and less favorable gearing ratio of next gear. I'd gear up sooner only on 1st, when redline nears so fast, that it's easy to hit hard rev limit and loose some acceleration due stagger from ecu cutting power in very abrupt way.

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