E-Tuning FAQ
What is an e-tune?
An e-tune is a custom remote ECU calibration developed for your vehicle, engine, modifications, fuel and intended use. You install calibration files, record the requested datalogs and receive revisions remotely until the tuning process is completed.
Which tuning platforms do you support?
Yosh Tuned currently offers remote tuning services for supported Hondata FlashPro, Hondata K-Pro/S300 and KTuner applications. If you are unsure which service applies to your vehicle, use the Which Tune Do I Need? page before purchasing.
Is tuning hardware included?
No. Yosh Tuned tuning products include calibration services only. You must already have the compatible tuning hardware and any supporting equipment required for your application, such as the ECU hardware, laptop, cables and wideband equipment where applicable.
What happens after I purchase?
Keep your order number available and complete the required vehicle/setup information. Yosh Tuned will review the information and prepare the appropriate starting calibration once the required details are received.
New customers should also review How E-Tuning Works and the Pre-Tuning Checklist.
Is the starting calibration my finished tune?
No. The starting calibration is for initial checks and datalogging. It is not the finished tune. Many starting files use a 6,000 RPM limiter while Yosh Tuned checks the setup, sensors, fueling and drivability; the limit may change as tuning progresses.
Follow the instructions sent with your file. Do not perform a wide-open-throttle (WOT) pull unless Yosh Tuned specifically requests one.
What datalogs will I need?
Yosh Tuned will tell you exactly what to log with each calibration. Depending on the stage, that may be a cold start and idle log, normal driving, part-throttle or controlled boost operation, or a specific pull.
Send each requested log as a separate file. For any requested pull, follow the gear, starting and ending RPM, and throttle instructions in your tuning email. Do not use another customer's instructions or make a WOT pull until Yosh Tuned requests it. See Datalog & Revision Instructions.
How long does the tuning process take?
Calibration revisions and tuning-related support are handled Monday through Friday on normal business days. Yosh Tuned makes reasonable efforts to provide revisions promptly, but a response or revision every business day is not guaranteed.
Total completion time depends on workload, vehicle condition, datalog quality, troubleshooting requirements and how quickly requested logs are returned.
Do I need a wideband?
A properly installed and configured wideband is required for some applications and may be required for modified or forced-induction setups. Requirements depend on the tuning platform and vehicle configuration.
If your setup requires a wideband, it must be working correctly before tuning can continue.
What spark plugs and gap should I use?
The correct plug and gap depend on your engine and setup. Yosh Tuned will tell you if a different plug or gap is needed and when to install it. You may be asked to keep a fresh set on standby for a later stage.
Do not change the plug type or gap based on a general guide or another customer's setup. If your current plugs are worn, damaged or fouled, let Yosh Tuned know before logging.
What AFR should my car be running?
There is no single AFR or lambda target for every car. The appropriate target depends on the fuel, engine, load, manifold pressure and the stage of tuning. Yosh Tuned sets the target for your setup.
If a reading looks unexpectedly lean or rich, stop the test, save the datalog and send it in the same tuning email thread. Do not change the calibration yourself or repeat a concerning pull before it is reviewed.
Does my vehicle need to be mechanically ready?
Yes. Remote tuning cannot repair boost leaks, vacuum leaks, fuel-pressure problems, misfires, wiring faults, overheating, failed sensors, low compression or other mechanical issues.
Tuning may be paused until any issue that prevents safe or accurate calibration is corrected.
What if something feels wrong during a log or pull?
Let off the throttle and stop the test if you notice a misfire, unusual noise, overheating, fuel-pressure problem, unexpected or uncontrolled boost, unexpectedly lean reading, excessive knock or other abnormal behavior.
Save the log and tell Yosh Tuned what happened. Do not repeat the pull until the issue and log have been reviewed. A mechanical, electrical or fuel-system fault must be corrected before tuning continues.
Do you sell standalone basemaps?
No. Yosh Tuned does not sell generic or standalone basemaps. A custom starting calibration is included with a purchased full e-tuning service and is intended to be followed by the required datalogging and revision process.
When should I purchase a Re-Tune?
Purchase the Existing Customer Re-Tune if Yosh Tuned previously completed your tune and you later changed something that materially affects the calibration.
Examples can include injectors, fuel type, fuel pressure, MAP sensor, engine configuration, camshafts, intake manifold, turbocharger or supercharger setup, boost level or other major calibration-related hardware.
Your previous order number and latest Yosh Tuned calibration may be required.
I already have a tune from another tuner. Is that a Re-Tune?
No. If Yosh Tuned did not complete the previous tune, purchase the appropriate full e-tuning service.
Should I change anything between revisions?
Keep the fuel, spark plugs and gap, boost setting, sensors, hardware and calibration the same unless Yosh Tuned instructs you to change them. If something changes or you uploaded a different file, tell us before recording the next log.
Changes during tuning can make previous logs and revisions inaccurate and may require additional calibration work. After a completed tune, significant setup changes may require an Existing Customer Re-Tune.
What fuel types are supported?
Available fuel options depend on the vehicle and tuning platform. Options shown on each product page can include pump gasoline, ethanol blends, E85 and flex-fuel configurations where supported.
If your fuel setup is not listed, contact Yosh Tuned before purchasing.
How should I send datalogs and tuning questions?
Reply in the same tuning email thread at tuning@yoshtuned.com and include your order number. Attach each requested log separately, label what happened in each, and mention any symptoms or changes since the last revision.
Avoid duplicate emails or copies of the same log so the calibration history stays together. See Datalog & Revision Instructions for the full guide.
What if I do not start my tune right away?
Tuning services must be initiated within 30 days of the original purchase date unless Yosh Tuned approves an extension. Orders not activated within that period may expire and require purchase of a new tuning service.
Can I get a refund on a tuning service?
Tuning and calibration services are custom digital services. All sales are final once tuning work has begun, except where otherwise required by law or specifically approved by Yosh Tuned.
For complete details, review the store's Refund Policy.
Are horsepower, boost or performance results guaranteed?
No specific horsepower, torque, boost pressure, acceleration time or other performance result is guaranteed unless expressly agreed to in writing. Results depend on the vehicle, hardware, fuel, mechanical condition, environment and other factors.
Do tuning services require shipping?
No. E-tuning, re-tuning and calibration services are delivered electronically. Physical shipping applies only to merchandise and other physical products.
What if I am still unsure what to buy?
Start with Which Tune Do I Need?. If your vehicle or setup still does not clearly match an available option, contact tuning@yoshtuned.com before purchasing.