Have you had a Syvecs totally replacing the stock ECU running stock twin turbos sequentially?
Also, have you had the above on a VVTi automatic running the gearbox and fly by wire throttle AS WELL?
I am shortly to install a Syvecs that the customer hopes will do all this, but I am yet to hear of anyone running this complex configuration.
Thanks.
Supra VVTi twin turbo automatic questions.
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Chris Wilson
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pat
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Re: Supra VVTi twin turbo automatic questions.
Chris,
I am not aware of a working staged twin turbo setup right now, most people just go for a big single blower. That said, it should be possible to make it work with an S6GPPlus and some support code on the GPPlus to augment the normal boost control strategy. We could look into this if there is sufficient interest - it would work on Subaru Legacy Twin Turbo too.
The gearbox control should be fine - I believe we've already had the ECU control the AT box in the JZA80. If memory serves, the "DBW" throttle isn't really a DBW throttle as such, but it should be possible to control it. There are some other oddities with it but it should be workable - the biggest issue seems to be with the sensors suffering non-linearities or corrosion. IIRC it is ETCS-i so basically cable throttle with a motor override...
Hope this helps,
Pat.
I am not aware of a working staged twin turbo setup right now, most people just go for a big single blower. That said, it should be possible to make it work with an S6GPPlus and some support code on the GPPlus to augment the normal boost control strategy. We could look into this if there is sufficient interest - it would work on Subaru Legacy Twin Turbo too.
The gearbox control should be fine - I believe we've already had the ECU control the AT box in the JZA80. If memory serves, the "DBW" throttle isn't really a DBW throttle as such, but it should be possible to control it. There are some other oddities with it but it should be workable - the biggest issue seems to be with the sensors suffering non-linearities or corrosion. IIRC it is ETCS-i so basically cable throttle with a motor override...
Hope this helps,
Pat.
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Chris Wilson
- Posts: 59
- Joined: Wed Jan 21, 2009 1:05 pm
Re: Supra VVTi twin turbo automatic questions.
Hi Pat, thanks for the reply. If the guy is happy to have the sequentials run in parallel (which kind of defeats all the development Toyota put into a wide torque curve, but still...), would things be OK with off the shelf stuff? The Syvecs running the engine in effectively single turbo format, and the VVTi drive by wire converted to a "proper" DBW system, using the Whifbitz kit? Any issues with controlling the VVti (buttons on steering wheel) auto box? Thanks.
Re: Supra VVTi twin turbo automatic questions.
Hi Chris
Seq Control has been done by a few, one customer did with GT28 turbos but with the power gains found in the TTC mode (search old thread on Mkiv.net for reasons) and more predictable torque curve with our UK winter roads. All have agreed it much more suitable when calibrated with a Syvecs using Twin Turbo mode.
Would need an S6Plus, to do Seq control, VVTI and Autobox control.
All of which has been done using the OEM TB, VVT system and keeping the ABS/Trac all happy.
Some swap out the OEM TB to a new bosch design because the OEM Throttle TB uses a Clutch based system with gearing from a DC motor which is alot slower compared to new design Bosch Tb's. Another issue with the OEM TB is that the Response is not linear due to a Heavy spring which is used to return the motor back to closed if not powered.
Ryan
Seq Control has been done by a few, one customer did with GT28 turbos but with the power gains found in the TTC mode (search old thread on Mkiv.net for reasons) and more predictable torque curve with our UK winter roads. All have agreed it much more suitable when calibrated with a Syvecs using Twin Turbo mode.
Would need an S6Plus, to do Seq control, VVTI and Autobox control.
All of which has been done using the OEM TB, VVT system and keeping the ABS/Trac all happy.
Some swap out the OEM TB to a new bosch design because the OEM Throttle TB uses a Clutch based system with gearing from a DC motor which is alot slower compared to new design Bosch Tb's. Another issue with the OEM TB is that the Response is not linear due to a Heavy spring which is used to return the motor back to closed if not powered.
Ryan