Forge MBC Users -how much psi increase per click?
Mar 10, 2007, 06:33 PM
#1
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Forge MBC Users -how much psi increase per click?
For those of you with Forge MBC's, if you want to crank the boost by one psi, how many clicks does it take?
For me, it seems to depend on the boost level. At ~20psi, if I want to increase by 1 psi, it only takes a few clicks. But at higher boost levels (24-25 psi) it seems that it takes more clicks per psi. I was running race gas today, and had to turn the MBC by over 15 clicks to go from 21-22 psi to 24-25 psi.
Has anyone else experienced this, or am I likely to have a leak somewhere?
For me, it seems to depend on the boost level. At ~20psi, if I want to increase by 1 psi, it only takes a few clicks. But at higher boost levels (24-25 psi) it seems that it takes more clicks per psi. I was running race gas today, and had to turn the MBC by over 15 clicks to go from 21-22 psi to 24-25 psi.
Has anyone else experienced this, or am I likely to have a leak somewhere?
Mar 10, 2007, 06:58 PM
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well yell all it is...is a spring pressing more or less on a ball....the more tension the spring places on the ball the more boost it will hold before opening up that wastegate....its not an exact science of x clicks = x boost....
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Mar 29, 2007, 07:31 AM
#10
I'm getting there.
I was doing full boost runs in 3rd last night after 9pm - and that's a bit scary for me since I didn't wanna go far from my subdivision. I was turning about 7-8 clicks at a time, looks like I need to be more liberal but was more concerned with being cautious!
I was doing full boost runs in 3rd last night after 9pm - and that's a bit scary for me since I didn't wanna go far from my subdivision. I was turning about 7-8 clicks at a time, looks like I need to be more liberal but was more concerned with being cautious!
Mar 30, 2007, 07:52 AM
#11
I'm getting there.
I was doing full boost runs in 3rd last night after 9pm - and that's a bit scary for me since I didn't wanna go far from my subdivision. I was turning about 7-8 clicks at a time, looks like I need to be more liberal but was more concerned with being cautious!
I was doing full boost runs in 3rd last night after 9pm - and that's a bit scary for me since I didn't wanna go far from my subdivision. I was turning about 7-8 clicks at a time, looks like I need to be more liberal but was more concerned with being cautious!
Mar 30, 2007, 08:22 AM
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Same for me -about 4 clicks/psi. But for me, that rule of thumb only works at the 20 psi level. When I tried to go from 22 to 25 psi (using race gas at the track), I had to turn it more than 20-something clicks to just to get to ~24 psi.
Maybe I have a high pressure leak or maybe I should be using the stiffer spring on the MBC.
Maybe I have a high pressure leak or maybe I should be using the stiffer spring on the MBC.
Mar 30, 2007, 08:28 AM
#13
^^ It took me probably 40+ clicks to get up near 18. After that it was something like the 4 clicks per psi.
I haven't tried running it past ~21 as I'm still fine tuning it, but also don't have any plans. I have a re-tune scheduled in early April so I can wait unpatiently for that!
I haven't tried running it past ~21 as I'm still fine tuning it, but also don't have any plans. I have a re-tune scheduled in early April so I can wait unpatiently for that!
