5EAT Tuning and how not to end up with a farked gearbox...

[Rome_BRZ]

So what is the solution for getting the 5EAT to shift out of 1st instead of shitting itself before shifting into 2nd?

[dr20t]

So what is the solution for getting the 5EAT to shift out of 1st instead of shitting itself before shifting into 2nd?

Boost taper toward redline

High boost conditions in first do not allow tcu to shift as shift parameters are not met

Even when we increased the boost referenced shift threshold on my rom to 22psi it still wouldn't shift so only way is to taper it plus some dbw adjustments me think

Mick

[Rome_BRZ]

So what is the solution for getting the 5EAT to shift out of 1st instead of shitting itself before shifting into 2nd?

Boost taper toward redline

High boost conditions in first do not allow tcu to shift as shift parameters are not met

Even when we increased the boost referenced shift threshold on my rom to 22psi it still wouldn't shift so only way is to taper it plus some dbw adjustments me think

Mick

Yes but I want to see this actually done in practice not in theory

[alexeiwoody]

Also your auto was different to Rome's (unless you're talking about your new one?) So whether that applies to our gearbox? I have no problem shifting out on 19psi.

I do remember my kido dyno tune had a mistake in that same spot I couldn't WOT it out of first gear. In my case it was probably the engine temps were higher during the tune and it wasn't countered in in the final tune - then next day engine bay and tmic are nice and cool, colder air comes into turbo more than what the ecu is expecting, boost builds too fast, suddenly ecu realises it's overshot target boost anddd voila....boost spike every time like clockwork

Having a fmic though, is yours a gearbox thing, jerome? Had it for long?

[dr20t]

Also your auto was different to Rome's (unless you're talking about your new one?) So whether that applies to our gearbox? I have no problem shifting out on 19psi.

I do remember my kido dyno tune had a mistake in that same spot I couldn't WOT it out of first gear. In my case it was probably the engine temps were higher during the tune and it wasn't countered in in the final tune - then next day engine bay and tmic are nice and cool, colder air comes into turbo more than what the ecu is expecting, boost builds too fast, suddenly ecu realises it's overshot target boost anddd voila....boost spike every time like clockwork

Having a fmic though, is yours a gearbox thing, jerome? Had it for long?

How different do you think the boxes are?

[alexeiwoody]

How different do you think the boxes are?

I thought Matt wrote somewhere about the different (03-06 and then 07-09) ecu logics boost settings and Wot etc affecting the gear shifts - is what I was referring to.

[<GB>]

What rpm are you guys shifting at at what boost?

[KiDo_Tuning]

So what is the solution for getting the 5EAT to shift out of 1st instead of shitting itself before shifting into 2nd?

ECU controlling boost lets it shift on time by dropping boost to unload the gearbox, very similar to what a manual gearchange would do etc. Alternative is dropping the throttle to about 20% or less as it approaches 6400rpm etc

Your HKS Easy Writer fixes that

[Rome_BRZ]

So what is the solution for getting the 5EAT to shift out of 1st instead of shitting itself before shifting into 2nd?

ECU controlling boost lets it shift on time by dropping boost to unload the gearbox, very similar to what a manual gearchange would do etc. Alternative is dropping the throttle to about 20% or less as it approaches 6400rpm etc

Your HKS Easy Writer fixes that

Well I hope so because it's starting to piss me off!

And GB there is no option to shift sooner in my car. No matter when I try to upshift it myself, it will always rev out to the limiter in 1st when I'm running S# mode in high boost

[<GB>]

So what is the solution for getting the 5EAT to shift out of 1st instead of shitting itself before shifting into 2nd?

ECU controlling boost lets it shift on time by dropping boost to unload the gearbox, very similar to what a manual gearchange would do etc. Alternative is dropping the throttle to about 20% or less as it approaches 6400rpm etc

Your HKS Easy Writer fixes that

Well I hope so because it's starting to piss me off!

And GB there is no option to shift sooner in my car. No matter when I try to upshift it myself, it will always rev out to the limiter in 1st when I'm running S# mode in high boost

ah i see, what happens if you do as matt says and back of the throttle a little?

[Rome_BRZ]

ECU controlling boost lets it shift on time by dropping boost to unload the gearbox, very similar to what a manual gearchange would do etc. Alternative is dropping the throttle to about 20% or less as it approaches 6400rpm etc

Your HKS Easy Writer fixes that

Well I hope so because it's starting to piss me off!

And GB there is no option to shift sooner in my car. No matter when I try to upshift it myself, it will always rev out to the limiter in 1st when I'm running S# mode in high boost

ah i see, what happens if you do as matt says and back of the throttle a little?

I think he was talking about dropping it in the tune, but if he is referring to my actual pedal, when I accelerate at about 80% from a start I can get it into 2nd but it kind of holds onto 1st for a while before going into 2nd

[chook]

I don't know how different the transmissions are but mine holds 22psi all the way to redline and has never hit the limiter in any gear, I have had a valve body mod to increase line pressure so maybe this helps? I don't know but hope you guys get it sorted soon.

[Rome_BRZ]

I don't know how different the transmissions are but mine holds 22psi all the way to redline and has never hit the limiter in any gear, I have had a valve body mod to increase line pressure so maybe this helps? I don't know but hope you guys get it sorted soon.

How much power is yours putting out now Chook? Cos I didn't have this issue previously only at current power levels

[chook]

Last tune at Insight netted 224awkw

[alexeiwoody]

So what is the solution for getting the 5EAT to shift out of 1st instead of shitting itself before shifting into 2nd?

ECU controlling boost lets it shift on time by dropping boost to unload the gearbox, very similar to what a manual gearchange would do etc. Alternative is dropping the throttle to about 20% or less as it approaches 6400rpm etc

Your HKS Easy Writer fixes that

Why the need for hks here (the differences between the ecu and the evc are not that drastically different to not be able to shift correctly. Many tuners prefer the factory ecu to the hks unit anyway and some consider the ecu downright superior. A small change in the tune would just about equate the two setups, for our purpose of unloading the gearbox. Im not following why jerome has to put up with this issue...?) And as far as I can tell this hasn't been fixed for quite a while now? Just confused/curious?