boost by gear PWM problem

billy_bad_a$$ · Post by **billy_bad_a$$** » Fri Jul 10, 2009 9:06 pm

Boost by gear is only working in 1st and half of 2nd then nothing. I have attached the datalog showing PWM works like its suppose to then half way thru 2nd it goes to 1%. This happened on both of my passes and I cant figure it out. please help as I have a race the day after tomorrow and need this fixed.

billy_bad_a$$ · Post by **billy_bad_a$$** » Sat Jul 11, 2009 5:25 pm

I guess nobody can help. Dont know if it matters but I have a hondata solenoid.

locash · Post by **locash** » Sun Jul 12, 2009 3:49 pm

Can you post the calibration? This might help..

locash · Post by **locash** » Sun Jul 12, 2009 3:55 pm

On a side note, you are maxing out the PWM duty cycle as well, which is probably your problem.. What gate springs are you running, what turbo, etc?

billy_bad_a$$ · Post by **billy_bad_a$$** » Mon Jul 13, 2009 7:39 am

locash wrote:Can you post the calibration? This might help..

how do I post the calibration?

billy_bad_a$$ · Post by **billy_bad_a$$** » Mon Jul 13, 2009 7:40 am

locash wrote:On a side note, you are maxing out the PWM duty cycle as well, which is probably your problem.. What gate springs are you running, what turbo, etc?

cant remember what springs are in there but we are changing them this week and im running a gt4088. we had it so the pwm should only run 99% at the most but I guess thats cutting it too close and its spiking?

billy_bad_a$$ · Post by **billy_bad_a$$** » Tue Jul 14, 2009 9:45 am

Ok I guess nobody knows what the problem is. Thanks anyway

Post by **Spunkster** » Tue Jul 14, 2009 9:55 am

You haven't posted the calibration you are using.

billy_bad_a$$ · Post by **billy_bad_a$$** » Tue Jul 14, 2009 10:52 am

I don't know how to. I am not the tuner just the owner. I asked how to do it so I could.

Post by **Spunkster** » Tue Jul 14, 2009 10:55 am

Post it the same way you posted the calibration. If you don't have the calibration contact your tuner and have them email it to you.

billy_bad_a$$ · Post by **billy_bad_a$$** » Tue Jul 14, 2009 3:10 pm

my tune

Post by **Spunkster** » Tue Jul 14, 2009 3:35 pm

Look at your air temp compensation table while looking at the datalog and you will see that you are adding 2% duty cycle to the 99% you already have set whihc bsically makes it go back to 1% (99 = 2 = 101%) and excedeing 100% cannot occur. Either remove the compensation correction or you may need to increase the wastegate spring pressure.

billy_bad_a$$ · Post by **billy_bad_a$$** » Tue Jul 14, 2009 4:11 pm

Good call. Thanks a lot for your help