Unless Toyota acknowledge it as being abnormal then I think it's safe to say it's by design.
GR Yaris Inconsistent Boost
- Thread starter YobboYaris
- Start date
Just speculating, but I've been logging boost pressure before the throttle body also and notice it sometimes spikes. So my theory is in low gears boost spikes so quickly the electronic/pneumatic wastegate isn't quick enough to adjust, so instead they use the, very quick, throttle body to regulate the boost?
Definitely sounds plausible. Is that a factory sensor with PID available in Torque?
I have it on the JB4, if not in torque it should be possible to put in
I'll take a look
We're talking about throttle valve. Recirc valve is used to bleed boost too though. Turbosmart writes in their instructions their valve is made to be as fast as the original (being heavier and stronger?), to avoid issues.
white rabbit
New member
- Feb 28, 2022
- 12
- 21
I have actually tried, and this is probably due to
due to increased exhaust pressure due to the first catalyst being too close to the turbine.
Boost pressure is cut to protect the engine.
It is possible to stabilize boost pressure by using a catalyst far enough away from the turbine.
For example, like this.
revo-tune.jp
due to increased exhaust pressure due to the first catalyst being too close to the turbine.
Boost pressure is cut to protect the engine.
It is possible to stabilize boost pressure by using a catalyst far enough away from the turbine.
For example, like this.
Revolution Online Catalog / スポーツキャタライザー(前期）
Michael Knight
Totally Hooked
maybe there's a good reason why it is done in stock software. just thinking..
Yeah there will definitely be good reason. Unfortunately the only people with that info at the moment are Toyota and the people with that tuning software.
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From what I've seen the pre-throttle boost tends to spike in low gears, guessing the WG has some latency, so the faster regulating throttle controls the manifold pressure? I'm also thinking one needs a special hub dyno to be able to even tune for the lowest gears...
Anyway, I don't really see it as an issue as long the requested boost is at the manifold, surely this has been an issue when trying to remap properly though....
Anyway, I don't really see it as an issue as long the requested boost is at the manifold, surely this has been an issue when trying to remap properly though....
You were spot on with your earlier assessment as it was just confirmed here
For me throttle reduction due to the reasons listed above made the GRY's performance/accelerator pedal more inconsistent than any other car I've driven before. Now that I understand what's happening and that it's normal it doesn't bother me. Initially though it did feel abnormal.
The thing that did make this more confusing though were the owners that were adamant their cars were somehow unaffected by throttle intervention when in reality the ECU is always in the background adjusting throttle for a variety of reasons. The takeaway from all this though is that throttle intervention can lead to what some people describe as "inconsistent boost" from time to time and that the only way of fully eliminating it is by modifying the internal logic of the ECU.
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Didn't make this connection consciously, however I notice I subconsciously somehow prefer the feel of expert mode even if I'm not planning on taking some hard bends, so might very well be like that, possibly even in third gear now that I think of it. Will try to confirm...
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Even though throttle reduction is just part of the software I have found that for me, for whatever reason, this has almost completely eliminated the inconsistency. No idea how it's doing it but it works. Boost is now instantaneous in 6th gear too. Couldn't believe the difference it made once I installed it.
www.forgemotorsport.co.uk
Toyota Yaris GR Inlet Duct | FMINLD1 | Forge Motorsport | FMINLD1 | Forge Motorsport
Toyota Yaris GR Inlet Duct designed to add an aesthetically pleasing carbon fibre part to your engines bay, keeping temperatures down during spirited driving.
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Still never noticed this in 18 months of ownership. In comparison I had a mk7 fiesta st and the fact boost was limited in 1st and 2nd was blatantly obvious.
However there appears to be enough evidence to say this is a thing. Just glad I don't notice it and it doesn't affect my enjoyment of the car.
However there appears to be enough evidence to say this is a thing. Just glad I don't notice it and it doesn't affect my enjoyment of the car.
