Boost! Holding Back!help

[apayne1000]

right guys this is a weird one sometimes when i put my foot down .....it seems as tho somethings holding the car back stopping it go fast then all of a sudden it will stop holding back and power will come through and then its alright.....

Got an apexi turbo timer etc so heres the readings

cruising====14.5 a/f meter

foot down===11.5 a/f meter

foot off ====20.0 a/f meter

im running it at 9 psi shows on boost guage it has a dump valve and air filter!!!

ive seen simiular problems on here but i dont have any warning lights showing on my car!!

please help me its annoying :ffs: :ffs:

[john's gt4]

right guys this is a weird one sometimes when i put my foot down .....it seems as tho somethings holding the car back stopping it go fast then all of a sudden it will stop holding back and power will come through and then its alright.....

Got an apexi turbo timer etc so heres the readings

cruising====14.5 a/f meter

foot down===11.5 a/f meter

foot off ====20.0 a/f meter

im running it at 9 psi shows on boost guage it has a dump valve and air filter!!!

ive seen simiular problems on here but i dont have any warning lights showing on my car!!

please help me its annoying :ffs: :ffs:

Try removing the dump valve. I had the same problem and this sorted it. Dont know why it was happening though.

[GT4 RC Lover]

i have the same problem.

Where would i find the dump valve.