Delay in engine revs...! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Tekkk · 10-28-2022, 10:28 AM

Hello people! Help solve the problem
When my car's engine attains up 2500 rpm in first gear, I push harder on the gas pedal, as the result of this, there is a delay in engine revs. The effect is as if ESP has worked...

video of this problem:

and

Tcoat · 10-28-2022, 11:14 AM

Is it stock? Any mods?

tomm.brz · 10-28-2022, 11:26 AM

start with the very basic
Clean maf and map sensor, reset ecu unplugging battery and try again

Tekkk · 10-28-2022, 01:53 PM

Quote:

Originally Posted by Tcoat

Is it stock? Any mods?

yes, full stock. No mods

Tekkk · 10-28-2022, 02:03 PM

Quote:

Originally Posted by tomm.brz

start with the very basic
Clean maf and map sensor, reset ecu unplugging battery and try again

that's exactly what we did, but to no avail

tomm.brz · 10-28-2022, 03:32 PM

the fact that it starts exactly at 2800 where the stock oem tune switches to DI only at relatively low loads, makes me think of problems with the DI itself

Can you try to floor it heavily at 2000 rpm instead of give partial throttle?
like 2000 rpm floor it 100%... if you are quick enough it should still cover the zones where it uses 50/50% of injections at least untill 3200 rpm, so the esitation should begin a bit later

in the case it is the DI, don t really know how to help you, maybe some DI injectors is clogged up or faulty

Tekkk · 10-30-2022, 06:59 PM

And so, here is the result!
There is no delay when I increase speed sharply from 2000rpm.
But it's all in 1st gear!

Let me remind you that the delay occurs with a sharp increase in speed at 2500rpm, it is in this range that 2nd gear is switched on

Tekkk · 10-30-2022, 07:07 PM

An interesting moment, using the tiptronic, I switched the speed to 2nd gear at 2000rpm, as a result ... the same delay!
Bottom line, the delay occurs at the moment of gear shifting from 1 to 2

Tekkk · 10-30-2022, 07:19 PM

Maybe an automatic transmission torque converter?

x808drifter · 10-31-2022, 09:52 AM

Quote:

Originally Posted by Tekkk

Maybe an automatic transmission torque converter?

Sounds like my last auto car when it got super hot from racing so maybe...

Tekkk · 11-01-2022, 11:08 AM

Quote:

Originally Posted by tomm.brz

the fact that it starts exactly at 2800 where the stock oem tune switches to DI only at relatively low loads, makes me think of problems with the DI itself

Can you try to floor it heavily at 2000 rpm instead of give partial throttle?
like 2000 rpm floor it 100%... if you are quick enough it should still cover the zones where it uses 50/50% of injections at least untill 3200 rpm, so the esitation should begin a bit later

in the case it is the DI, don t really know how to help you, maybe some DI injectors is clogged up or faulty

I made such a test, please look above, there is a video

tomm.brz · 11-01-2022, 11:21 AM

dont know what to say sorry, i d a log from Obd to help you more

Tekkk · 11-03-2022, 09:35 AM

Quote:

Originally Posted by tomm.brz

dont know what to say sorry, i d a log from Obd to help you more

Another interesting observation. I arrived at the service, got into the car with a mechanic for a test drive - and there was no delay! worked perfectly! No matter how hard I try. But as soon as the car was turned off and restarted, this problem immediately got out, the delay reappeared. ECM? UNIT-AT CONTROL ?

Tekkk · 11-15-2022, 05:45 PM

heeeelp guys

10-28-2022, 10:28 AM	#1
Tekkk Member Join Date: Oct 2022 Drives: GT86 white Location: Respublika Kazakhstan Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Delay in engine revs...! Hello people! Help solve the problem When my car's engine attains up 2500 rpm in first gear, I push harder on the gas pedal, as the result of this, there is a delay in engine revs. The effect is as if ESP has worked... video of this problem: and

10-28-2022, 11:14 AM	#2
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,283 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	Is it stock? Any mods? __________________ Racecar spelled backwards is Racecar, because Racecar.

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10-28-2022, 11:26 AM	#3
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,195 Thanks: 500 Thanked 1,065 Times in 774 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	start with the very basic Clean maf and map sensor, reset ecu unplugging battery and try again

10-28-2022, 03:32 PM	#6
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,195 Thanks: 500 Thanked 1,065 Times in 774 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	the fact that it starts exactly at 2800 where the stock oem tune switches to DI only at relatively low loads, makes me think of problems with the DI itself Can you try to floor it heavily at 2000 rpm instead of give partial throttle? like 2000 rpm floor it 100%... if you are quick enough it should still cover the zones where it uses 50/50% of injections at least untill 3200 rpm, so the esitation should begin a bit later in the case it is the DI, don t really know how to help you, maybe some DI injectors is clogged up or faulty

10-30-2022, 06:59 PM	#7
Tekkk Member Join Date: Oct 2022 Drives: GT86 white Location: Respublika Kazakhstan Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	And so, here is the result! There is no delay when I increase speed sharply from 2000rpm. But it's all in 1st gear! Let me remind you that the delay occurs with a sharp increase in speed at 2500rpm, it is in this range that 2nd gear is switched on

10-30-2022, 07:07 PM	#8
Tekkk Member Join Date: Oct 2022 Drives: GT86 white Location: Respublika Kazakhstan Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	An interesting moment, using the tiptronic, I switched the speed to 2nd gear at 2000rpm, as a result ... the same delay! Bottom line, the delay occurs at the moment of gear shifting from 1 to 2

10-30-2022, 07:19 PM	#9
Tekkk Member Join Date: Oct 2022 Drives: GT86 white Location: Respublika Kazakhstan Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Maybe an automatic transmission torque converter?

11-01-2022, 11:21 AM	#12
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,195 Thanks: 500 Thanked 1,065 Times in 774 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	dont know what to say sorry, i d a log from Obd to help you more

11-15-2022, 05:45 PM	#14
Tekkk Member Join Date: Oct 2022 Drives: GT86 white Location: Respublika Kazakhstan Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	heeeelp guys

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