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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 06-30-2020, 04:26 PM   #29
86TOYO2k17
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@dagle a stock car can still develop a vacuum or exhaust leak. This will throw off fuel trims. Fuel trims being off because of this can cause laggy input in throttle response especially from a stop/low rpm.

Hook up to the OBDII using tactrix, openflash tablet, ecutek. Probably some phone apps can do it.

Fuel trims could also be off from a dirty MAF causing similar issues, try cleaning it while your troubleshooting. Unplug and replug the throttle body cable incase bad connection.

If after all troubleshooting nothing is fixing it, could try replacing the throttle body, or even go to a larger TB, which can give better response. Or get a pedal commander and have instant response and complete control of throttle mapping. Takes 2 mins to install.
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Old 06-30-2020, 05:47 PM   #30
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it's 100% stock with a relatively recent (not recent in my book, but others may think so) ECU reset about 400 miles ago (1.5 gas tanks). I'll check on the vacuum in the intake system. I don't think there are any vacuum leaks, but all of the resonator/deadspace volume might be contributing to it. I also think that idle is a bit low (it's reading ~600RPM on the tach). Not sure where to find ltft/stft on the stock ECU, is that available somewhere? As far as exhaust leak, it might be hanging up on the lack of backpressure but I severely doubt it on an engine this size lol..





Right, not everyone has had the opportunity to drive a bunch of different sporty cars. If you have, that's great. I've driven most iterations of most sporty cars that have come out in the last decade and also a bunch of swapped race cars, exotics, etc. If you think the DBW system and pedal feel of the FRS/BRZ is the same or better than that of a modern enthusiast's sports car, that's totally OK, I simply disagree.

you're free to drive however you'd like in your car, I'll drive the way that I do... It's really not that big of a deal to me to ride the clutch. If it is to you and you're concerned with the replacement intervals or costs, that's totally fine and understandable. you've driven a few times in SF, i've driven here for more than a decade on most of the hills. if i found a better way to navigate the hills reliably, i would have done it. i haven't found anything yet, but i'm more than open to it if you have a better approach.

as far as DBW, as a factory system it's comparable in my opinion to the Chevy Cruze and Kia Optima. Better ones in my view are the C7 and C8 corvettes, the later 08-09 s2000's, and even the BMW M cars but that's my opinion on the matter.

I mentioned standalones because you stated that the DBW system in the FRS/BRZ is the closest thing you've gotten to cable. I offered to you that I've driven a number of racecars and swapped cars with full standalone systems because they are far better in terms of feel and adjustability (and to me, indistinguishable to cable). I was making the point that if indeed the FRS was the best DBW system you've ever experienced, you clearly didn't have any experience with fast DBW cars. That's all.
I've never had a fast car.... ever.... the frs is the pinnacle of cars.

Please tell us all more about your adventures in driving!
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Old 06-30-2020, 06:25 PM   #31
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I've never had a fast car.... ever.... the frs is the pinnacle of cars.

Please tell us all more about your adventures in driving!
That's unfortunate, hopefully your living situation permits and you'll be able to have one some day. I wouldn't personally consider the FRS as the pinnacle of cars but I'm glad that you enjoy it and have the opportunity to have it. I don't think I have enough time to tell you all the adventures but most of it revolves around streetdriven turbo 4bangers and crashing a couple of motorcycles.
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Old 06-30-2020, 06:37 PM   #32
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That's unfortunate, hopefully your living situation permits and you'll be able to have one some day. I wouldn't personally consider the FRS as the pinnacle of cars but I'm glad that you enjoy it and have the opportunity to have it. I don't think I have enough time to tell you all the adventures but most of it revolves around streetdriven turbo 4bangers and crashing a couple of motorcycles.
Oh, please. Go on. Regale us with at least one tale.
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Old 06-30-2020, 07:48 PM   #33
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I'm surprised that no-one has mentioned but there is no Sport mode on a MT and the AT Sport mode is just for changes in the gearbox. There's no setting that changes throttle response on this car as standard.
I was going to say something but the way this thread is going I choose instead.
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Old 07-01-2020, 04:40 AM   #34
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That's unfortunate, hopefully your living situation permits and you'll be able to have one some day. I wouldn't personally consider the FRS as the pinnacle of cars but I'm glad that you enjoy it and have the opportunity to have it. I don't think I have enough time to tell you all the adventures but most of it revolves around streetdriven turbo 4bangers and crashing a couple of motorcycles.
Turbo cars have a different throttle feel, so maybe you need a turbo kit installed.
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Old 07-01-2020, 10:55 AM   #35
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dagle is ok. He does motorbikes too.

I was wrong about the buttons though.
I only turn the bacon off temporarily to get out of my drive.

Have not taken advantage of the VSC/SPORT button.
Only pushed yesterday to see the dash lights, then turned it off.

600 on warm idle is standard and not something to worry about.
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Old 07-01-2020, 11:35 AM   #36
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For what it is worth I think the throttle response is poor as well, mostly in the lower RPM's. Mid to upper RPM's it is okay.
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Old 07-01-2020, 04:24 PM   #37
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I can't believe that this thread has gone on for 36 posts and I haven't chimed in -

OK, so, here is my contribution.

The throttle response on my stock 2013 FR-S is just fine.
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Old 07-01-2020, 04:31 PM   #38
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So is mine.
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Old 07-01-2020, 04:36 PM   #39
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I guess us old geezers no longer have the reflexes to notice the nanosecond delay between stepping on the gas pedal and getting a response.
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Old 07-01-2020, 04:47 PM   #40
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I think the stock throttle map is all over the place. Too sensitive in the lower end and barely anything in the upper, pretty typical of most cars
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Old 07-01-2020, 06:07 PM   #41
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my issue is only leaving from a stop with light throttle, otherwise it's fine. i took a look in the morning on a completely cold start and all intake components are snugged. i'll remove resonators and other chambers on the weekend to rule them out but i kind of doubt those to be the cause. I tried both VSC Sport mode ON and OFF and reproduced the delay in both. Particularly with very light throttle (barely touching the pedal) the delay is very pronounced. I ruled out my clutch input by letting go of the clutch and rolling at 1mph and the delay was still present. Dirty MAF or maybe another ECU reset (since it was reset in a different climate prior) are the next things i'll work through if removing the intake resonators and sound generator doesn't help.
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Old 07-01-2020, 10:48 PM   #42
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I guess us old geezers no longer have the reflexes to notice the nanosecond delay between stepping on the gas pedal and getting a response.
And I guess we are just used to the feeling through the support insoles in our house slippers -
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