have a 9, installed the forge mbc. ended up using the stiff spring. have lubed it as directed in other posts. installed on the turbo nipple and wastegate nipple. wot in first/second/third and it holds 21psi. only had to turn it 2 clicks past the lowest setting. now if you do a 3rd gear run from 1500rpm's and up, it hits 25psi and holds.

any ideas?

 

Not sure what the question is. You should see more boost in higher gears, because there is more load. It's highly unlikely you are seeing the exact same boost right at 21psi in 1-3 either...you probably just can't tell because you're accelerating so fast, can't focus on the boost gauge, and the gauge is not digital to show you the exact boost. It gradually does more boost in each successive gear. If you have a new model UNOS, you should probably be using the soft spring turned up, because the stiff spring at minimum is too much.

 

so if I set it for 21psi in the third gear pull from 1500 and up, it will only hit 15-16psi taking off in 1,2 and 3rd gear.

 

and if I use the soft spring, I can't turn it up to 25psi on racegas..

 

Are you sure? Have you tried? The new version can go pretty high with the soft spring.

Yes, when we run 21psi in 3rd, we hit much less boost in the earlier gears. I told you that it increases in each successive gear. You will see significantly more peak boost in 3rd than in 1st. I hope you weren't trying to hit 21psi in 1st...

 

lol 21 in first would be like 24-25 in third...

 

No. Try fifth or sixth with low rpms and wait a min. Same boost.

 

What are you talking about, and why do you keep entering threads and spewing idiocy constantly? Please stop.

 

Your car dosent have diffrent boost with diffrent gears, warr. Try at a low rpm in a high gear and see what happens?

 

Uh, yes it does. More load = more boost. You can't possibly be arguing this. I spike much higher in 6th than I do in 3rd...much higher in 3rd than in 1st. Please just stop...

 

O god here we go again. More comments from the peanut head

 

Ok your talking about spiking now. Humm.

 

What the hell else would I be talking about? The max boost level in each gear is higher...gimme a break...like I was talking about some other magical thing that happens when rolling into boost from low rpm. The spike is part of the boost profile. If you log it, you see it go up, then taper down...the highest point of that line still counts as boost. So, even AFTER the initial spike, which is higher, the boost stays higher longer in higher gears, because there is more load. Go study some MAP sensor boost logs in the Dynoflash forum if you're this uneducated.

 

consider this a warning for all 3 of you, please stop the bickering in these threads; there's no reason to constantly shat on one another. This is evoM after all, can't we all get along?

 

Hello...I know this is OT, but you are ABLE to make more boost in higher gears because there is more load. But, if you have a MBC set at a pressure low enough that it is able to hold that pressure steady all the way through first, then unless you have boost creep issues from inadequate wastegate flow, you shouldn't see higher boost in higher gears because a manual boost controller doesn't care what gear you are in, it just lets air pass through it at a certain psi which opens the wastegate, and if the wastegate is efficient enough, it will only boost to that pressure in any gear. However, if the MBC is set to open at a pressure not sustainable in lower gears, it will of course not open until it sees the higher boost pressures, which would be in the higher gears. Most MBCs also do not smooth out boost curves very well (although some have some built-in tricks that cut down spiking, like a small bleeder valve in conjunction with a spring/ball valve) so you may possibly see spiking in lower gears higher than that attainable in higher gears simply because the MBC could not react fast enough in the lower gears as boost comes on very rapidly.

If you have a very complicated electronic boost controller like the AVC-R, you can also set it up to see the exact same PSI in every gear, including smooth boost ramp-ups etc.

However, if you have an EBC like me that only controls duty cycle, you will see higher pressures as you go higher in gear just like Warr is talking about, because higher gears load the engine more. This is also the case with MBCs when using stock turbos toward their upper limits as the internal wastegate is prone to creep. So you see the same boost logs, but for different reasons...