Rev Works turbo kit 2k mile update - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Nightbringer · 08-31-2013, 09:28 PM

Open loop when cold, closed once warmed up. This was my thinking as well. On normal vehicles, there are triggers (various temperature sensors) that'll switch it over. I just remember mad_sb saying that our cars run in open loop way too long I believe. I'm just wondering...if it's running pigrich, it's not taking in the air volume expected. Intake cam angle or throttle open % change, idle to idle?

jamesm · 08-31-2013, 09:54 PM

i've observed the switch from open loop to closed loop on cold start. this is the exact moment that the load goes from crazy high (80+%) to normal (20-30%) and the idle settles down. the hunting up and down bit happens in closed loop after the switch.

Ross · 08-31-2013, 11:49 PM

Can you post a log up from cold start. Curious to see a few things, timing, air fuel ratio, commanded cam timing, as well as trims when it switches over into closed loop.

FA20Club.com · 09-01-2013, 12:43 AM

sounds like someone dinked with a table they didnt have to cause on all the cars ive tuned so far have yet to come across anything like this. sounds also like you maf scaling is off. you should have that much issue dialing in these setups. i spend more time building and adjusting ignition values while fine tuning than anything else.

jamesm · 09-01-2013, 11:17 AM

Quote:

Originally Posted by Ross

Can you post a log up from cold start. Curious to see a few things, timing, air fuel ratio, commanded cam timing, as well as trims when it switches over into closed loop.

I'm going to gather some in logworks format to share once my ot-2 shows up in a couple days. The ones I have now are from techstream. I can send them to you to review if you have the software.

1stGenBRZ86 · 09-01-2013, 12:43 PM

this may be completely incorrect, but maybe something is possibly making your car go through a throttle body relearn procedure every time you start the car? I know this is a common issue with DBW toyotas after changing the battery.

mike the snake · 09-01-2013, 02:15 PM

When you refer to "load", what are you talking about here? I'm still learning about our fuel injection systems. I still don't know what "trims" are either.

Quote:

Originally Posted by jamesm

i've observed the switch from open loop to closed loop on cold start. this is the exact moment that the load goes from crazy high (80+%) to normal (20-30%) and the idle settles down. the hunting up and down bit happens in closed loop after the switch.

jamesm · 09-01-2013, 02:19 PM

Quote:

Originally Posted by mike the snake

When you refer to "load", what are you talking about here? I'm still learning about our fuel injection systems. I still don't know what "trims" are either.

Load is one of the parameters an engine uses to calculate fuel and ignition timing. It's pretty much a function of rpm and throttle input.

At very high rpm with the throttle barely open there is very low load. At low rpm, wide open throttle load is very high. Think of it as a measurement of how much work you're asking the engine to do.

Trims are offsets that the ecu applies to the base fuel tables based on sensor feedback. These are 'learned' or cached over time. High trims are bad.

mike the snake · 09-01-2013, 11:59 PM

So how is there any load at idle? You said your load goes from high/80% to low when the idle settles. Trying to grasp/visualize this.

Thanks for explaining.

Adeets · 09-02-2013, 12:02 AM

Quote:

Originally Posted by jamesm

It does have an act streetlite flywheel. The idle, when it's settled, is around 900rpm. They raised it to accommodate the flywheel when the clutch was installed I believe.
@mad_sb have you found anything in your investigation into the ecu that may help understand what's going on?

I lied my idle is locked in between 980-930

Hawaiian · 09-02-2013, 01:26 AM

Maybe it's something tied to the warm up phase. I'm guessing you're on pump not 85?

jamesm · 09-02-2013, 01:22 PM

Quote:

Originally Posted by mike the snake

So how is there any load at idle? You said your load goes from high/80% to low when the idle settles. Trying to grasp/visualize this.

Thanks for explaining.

I believe the load is so high because its holding the throttle plate open to stay idling at such a rich afr. It smokes during this period as well.

jamesm · 09-02-2013, 01:22 PM

Quote:

Originally Posted by Hawaiian

Maybe it's something tied to the warm up phase. I'm guessing you're on pump not 85?

Yes I'm on 93 pump gas. Haven't tried e85 yet.

Hawaiian · 09-02-2013, 03:18 PM

@JuniorAWD any thoughts?

09-02-2013, 01:26 AM	#25
Hawaiian That guy Join Date: Feb 2012 Drives: Ultramarine mt FR-S Location: chicago Posts: 2,370 Thanks: 692 Thanked 1,389 Times in 730 Posts Mentioned: 71 Post(s) Tagged: 0 Thread(s)	Maybe it's something tied to the warm up phase. I'm guessing you're on pump not 85? __________________ Ultramarine mt FR-S P&L stage 1 turbo Prime Motoring Flex fuel Jr Tuned 506whp @17psi (e73)

09-02-2013, 03:18 PM	#28
Hawaiian That guy Join Date: Feb 2012 Drives: Ultramarine mt FR-S Location: chicago Posts: 2,370 Thanks: 692 Thanked 1,389 Times in 730 Posts Mentioned: 71 Post(s) Tagged: 0 Thread(s)	@JuniorAWD any thoughts? __________________ Ultramarine mt FR-S P&L stage 1 turbo Prime Motoring Flex fuel Jr Tuned 506whp @17psi (e73) Last edited by Hawaiian; 09-02-2013 at 03:34 PM.

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08-31-2013, 09:28 PM	#15
Nightbringer Senior Member Join Date: Apr 2013 Drives: Scion FR-S Location: Nowhere Posts: 346 Thanks: 175 Thanked 211 Times in 120 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Open loop when cold, closed once warmed up. This was my thinking as well. On normal vehicles, there are triggers (various temperature sensors) that'll switch it over. I just remember mad_sb saying that our cars run in open loop way too long I believe. I'm just wondering...if it's running pigrich, it's not taking in the air volume expected. Intake cam angle or throttle open % change, idle to idle?

08-31-2013, 09:54 PM	#16
jamesm Banned Join Date: Mar 2013 Drives: 2013 FR-S Location: Orlando, FL Posts: 2,929 Thanks: 1,166 Thanked 2,294 Times in 1,180 Posts Mentioned: 313 Post(s) Tagged: 4 Thread(s)	i've observed the switch from open loop to closed loop on cold start. this is the exact moment that the load goes from crazy high (80+%) to normal (20-30%) and the idle settles down. the hunting up and down bit happens in closed loop after the switch.

08-31-2013, 11:49 PM	#17
Ross Senior Member Join Date: Jun 2013 Drives: 85 corolla gts Location: Chesapeake , Va Posts: 361 Thanks: 17 Thanked 177 Times in 110 Posts Mentioned: 26 Post(s) Tagged: 0 Thread(s)	Can you post a log up from cold start. Curious to see a few things, timing, air fuel ratio, commanded cam timing, as well as trims when it switches over into closed loop.

09-01-2013, 12:43 AM	#18
FA20Club.com Banned Join Date: Aug 2012 Drives: 2013 White Out FR-S Location: Florida Posts: 1,335 Thanks: 24 Thanked 1,162 Times in 501 Posts Mentioned: 323 Post(s) Tagged: 2 Thread(s)	sounds like someone dinked with a table they didnt have to cause on all the cars ive tuned so far have yet to come across anything like this. sounds also like you maf scaling is off. you should have that much issue dialing in these setups. i spend more time building and adjusting ignition values while fine tuning than anything else.

09-01-2013, 12:43 PM	#20
1stGenBRZ86 Senior Member Join Date: May 2013 Drives: 2013 BRZ Location: NYC Posts: 207 Thanks: 110 Thanked 58 Times in 35 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	this may be completely incorrect, but maybe something is possibly making your car go through a throttle body relearn procedure every time you start the car? I know this is a common issue with DBW toyotas after changing the battery.

09-01-2013, 11:59 PM	#23
mike the snake Senior Member Join Date: Jul 2013 Drives: 2013 BRZ Location: Norcal Posts: 1,592 Thanks: 1 Thanked 623 Times in 378 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	So how is there any load at idle? You said your load goes from high/80% to low when the idle settles. Trying to grasp/visualize this. Thanks for explaining.

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