JB4tech.com - International Turbo Tuning Discussion
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Turbomän Turbomän is offline
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Default JB4 for GR Yaris / GR Corolla - 05-26-2022, 01:35 PM

Out of curiosity, any of GR Yaris owners here?
Just got the kit and have tried it out few times.
Hope we will be more!
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Turbomän Turbomän is offline
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Default 05-29-2022, 11:08 PM

Tested with fuel bias adjustment - increasing fuel bias seems to increase the AFR so engine goes to leaner. with 0-10 fuel bias getting AFR close to 12.5:1 on WOT. FOL at 60 and trims btw 25-30
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Turbomän Turbomän is offline
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Default 05-29-2022, 11:09 PM

boost scaling seems to be off as target is maxing at 12PSI which is 0.83 bar.

Last edited by Turbomän; 05-30-2022 at 12:53 AM.. Reason: corrected
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Terry @ BMS Terry @ BMS is offline
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Default 05-30-2022, 02:07 PM

Working on some updates, so be sure to email me logs, etc. Latest firmware with MAF control adjustment is in the app.


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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Steveoexige Steveoexige is offline
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Default 06-04-2022, 09:42 AM

Really looking forward to seeing how this develops. Please share your results.

It could be a great sweet spot between an ECU remap and an unprogrammable tuning box (tdi, dtuk, etc).

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luchocamp luchocamp is offline
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Default 06-23-2022, 08:30 AM

GR Yaris .... let's do it !



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Default 06-23-2022, 08:41 AM

We've done a few now, with the added MAF control its working well!

To really drive the platform further though we need to get one in house in the USA. Hopefully Toyota releases the motor here soon.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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