- Joined
- Nov 27, 2015
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- 37
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- 617
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- 253
- Location
- Torrance California
- Website
- www.hondata.com
- Vehicle(s)
- 23' Type R,22' Civic Si,18' Accord 2.0T,17' FK8
- Thread starter
- #1
Hondata CARB tune - technical
For those of you who are new to Honda and are considering the 11th generation platform here’s a quick primer on Hondata. Hondata was founded by two enthusiastic Kiwi CRX owners who wanted their cars to go faster. We’ve been providing Honda tuning solutions for well over 20 years and support Honda’s racing programs.
The founding pillars of Hondata are:
- Honesty and integrity
- Education
- Quality
- Accuracy
Cliff notes.
- The clutch needs upgrading to run peak torque.
- The turbo has margin for more boost, but for race engines only, as you will need a downpipe and intercooler.
- The Injectors are the same as the 10th Si, so the 11th gen has similar power capabilities
We display boost in kPa. This is the native pressure unit of the ECU.
- 0 kPa is the vacuum of outer space
- 100 kpa is atmospheric pressure
- 200 kPa is twice atmospheric pressure (14.5 psi)
Airfuel
The 22 Civics run 14.7 air fuel until 4250 rpm wide open throttle for economy. We richen this for more power. Your MPG will drop at wide open throttle. Part throttle is unchanged. Just to be clear, normal driving, your economy is stock. Spirited driving will use more fuel.
Air temperatures
Stock, the 22 Si runs 73-77F in warm southern California. Our CARB tune heats the intake air to 82F. 5 degrees F is 1% air density and power. A larger intercooler will help reduce the air temps, but depending on how you use your car, it can end up slower with a larger intercooler. A larger intercooler takes longer to fill with air, reducing throttle response. Honda in a 25 hour race reverted back to stock intercoolers because the car was faster out of corners.
The road to more power is to get more air into the engine. This is measured in grams/second
Duty tells us the percentage of injector usage. 30% stock, 33.5% boosted. You cannot exceed 50% or you will spray fuel out the exhaust or at the time the spark is firing. Either way, not good. E85 requires 40% more fuel really loading up the injectors. As this is a CARB thread, this is a discussion for another thread.
WG command;
Wastegate command, is the boost control. 0mm is fully closed where the turbo is likely overspeeding. This indicates the Civic in a race configuration has a capacity for more boost.
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