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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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11-04-2014, 12:46 PM | #29 | |
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Do you think it's worth trying another dyno (i.e., coolant might have been cold, ECU may need to adjust, etc.) or should I just go straight to custom tuning? The odd part to me are the losses before 3500 RPM. I'm not a tuner, but that makes me think the engine wasn't completely happy for those runs or things hadn't properly broken in yet.
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11-04-2014, 01:16 PM | #30 | |
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Once you have this data, realistic expectations can be set and you can begin the custom tuning process. That's how I would do it at least |
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11-04-2014, 08:20 PM | #31 |
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11-05-2014, 02:16 AM | #32 |
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Since the intake wasn't changed I don't see all the fuss about the ECU needing time to learn. When I had my Ecutek tune flashed and dyno tuned there was no ECU re-learning required and subsequent dyno testing showed no further gains attributable to ECU re-learning. IMO the OP's results demonstrate one of the problems with "one-size-fits-all" canned tunes.
My mods were Borla UEL, Tsudo HFC front pipe, K&N drop-in. Base whp un-tuned was 160, canned stage 2 tune made 170 and the final tune produced 177whp. |
11-05-2014, 05:46 AM | #33 |
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Loss of power in close loop -> no learning required, no need to be up to temp.
Some stock cars need MAF scaling -> no learning required, no need to be up to temp. 177whp tuned warm vs 178whp tuned cold-> no learning required, no need to be up to temp. 160whp stock vs 177whp stock-> no need to care about different conditions, different engine, who cares if one is surprisingly high and one is surprisingly low.
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11-05-2014, 07:15 AM | #34 | |
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I think it would be worth logging a couple of wot runs in 3rd 2000-7500 to see what it looks like. you may have exhaust leak upsetting O2 readings causing high fuel trims or heaps of knock ect that is cause of power loss be interesting to see street log to make sure it all looks ok. on oft log afr commanded afr wideband afr this is second o2 sensor knock correction flkc iam ltft stft rpm load |
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11-05-2014, 07:52 AM | #35 |
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My money is still on doing the pulls before VVT activated, especially with the losses down low.
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11-05-2014, 07:54 AM | #36 |
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Does it take a while for AVCS to get cam position registration initially sorted after flashing the ROM and doing a run?
I seem to remember a recommendation to let the car idle for at least 30s, if not more, after re-flashing. OP and Fast_Freddy: was there any settling in time after reflashing between pulls, or did the pull get run straight away (i.e. was there any time for the cam timing to get settled)? |
11-05-2014, 08:04 AM | #37 | ||
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11-05-2014, 08:43 AM | #38 |
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All of that was sarcasm.
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11-05-2014, 08:53 AM | #39 |
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Doh I skimmed over your post and that went completely over my head
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11-05-2014, 10:11 AM | #40 |
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My guess is that the AFR is pegged rich or your IAM is lower than 1. I would gladly take a look at your logs and let you know if I see any problems. Log KC learned, Adv multiplier, AFR, commanded AFR, Engine speed, Engine Load, and MAF voltage. After making a few small adjustments to my own OFT tune I went from sort of feeling like I had a faster car to not being sure if I need forced induction.
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11-05-2014, 10:36 AM | #41 | |
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11-05-2014, 10:46 AM | #42 | |
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I don't remember how long it normally takes, but I just watch the OFT until the valve timing starts changing and then drive away.
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