Project X

From this archived post (https://honda-tech.com/zerothread?id=1037051&page=4), I've noticed that there is a way to change the boost level by using this boost by gear method.

Recently, I've installed the AVC-R in replace of my manual boost adapter (fixed at 10psi). Now I'm running at the 7psi from the wastegate spring.

I would like to set my boost level back to 10psi. Can the above method allows me to do that by increasing the start duty or do I need to initially setup the Boost/Duty Setting A before I can use this method?

non-VTEC

it takes quite a bit of time to get the boost by gear to work like you want especially without a dyno. be careful and watch your boost gauge and speed. you might over boost and/or crash watching all the silly displays/gauges. hehe...

set the target boost low. around 0.30 and just play with the duty cycle to increase boost.

make sure all the "learn gear" options are set to "0" to enable boost by gear.

under start duty the + or - in percentage is the duty cycle on top of the main duty cycle.

example. if you have your main target duty cycle 30% under start duty for every gear you add or subtract percentage it adds or subtracts on top of the original 30%. so if you go +30% in 3'rd gear you have a total of 60% duty.

hope that makes some kind of sense.

Project X

Thanks Louie. I didn't set it as low as 0.30 as my wastegate spring is already 0.5 kg/cm^2 (7 psi)

So tonight, I did the following:

Run 1:
- Setting OFF (running wastegate 7psi spring)
- WOT until 7000 rpm

Result: Bst: 0.53 kg/cm^2 = 7.54 psi max on AVC-R

Run 2:
- Boost/Duty: Bst: 0.60 kg/cm^2, Dty: 25%
- Learning: Default (1st-5th gear - ON)
- Ne point: Default (3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500)
- Start Duty: Default (1st-5th gear - 0%)
- F/B Speed: (1st-5th gear - 3)
- 4th gear at 60km/h, WOT until 6000 rpm

Result: Bst: 0.59 kg/cm^2 = 8.39 psi max on AVC-R

Few things to mentioned:
- Throttle position only max at 96% when WOT
- Run 2 seems to boost up slower than Run 1
- Couldn't monitor Autometer boost gauge thus can't compared boost against AVC-R
- Duty bar graph looks same before and after Run 2
- Boost from run 2 seems to be very close to what I've entered (targetted).

Am I doing something wrong?



Modified by Project X at 12:39 AM 7/17/2008

non-VTEC

if i recall correctly the F/B speed is some kind of feedback/auto adjusting system for the AVCR. i suppose the idea is good but in realtime it's kinda crappy since the wastegate spring will react diffrently to temprature changes so the unit will constanly try to adjust/modify boost/duty causing fluctuation in boost.

leave F/B to X or off.


like i said it will take some time to get it to perform the way you want. your best bet would be to rent out some dynotime so you can really set/play with the settings.

Project X

Great. Thanks.

Continuing my tuning...

Common for all runs below:
- Learning: Default (1st-5th gear - X)
- Ne point: Default (3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500)
- Start Duty: Default (1st-5th gear - 0%)
- F/B Speed: (1st-5th gear - X)
- 4th gear at 60km/h, WOT until 6000 rpm

Run 3
Boost/Duty: Bst: 0.65 kg/cm^2, Dty: 35%
Result: Bst: 0.61 kg/cm^2 max

Run 4:
Boost/Duty: Bst: 0.65 kg/cm^2, Dty: 40%
Result: Bst: 0.63 kg/cm^2 max

Run 5:
Boost/Duty: Bst: 0.65 kg/cm^2, Dty: 45%
Result: Bst: 0.67 kg/cm^2 max

Run 6:
Boost/Duty: Bst: 0.65 kg/cm^2, Dty: 43%
Result: Bst: 0.64 kg/cm^2 max

Final setting for tonight is Dty: 44%