Hey guys, making a new thread for a different question. Had my evo dynotuned.

1)My Hallman pro didn't work and would not boost past 12-14 psi even when fully turned... it even spiked from time to time and was unstable... so we decided to take it off. My evo 9 is the same as the aussie version (88580014). any aussies have problems installing MBCs? might be the ecu overriding it.... hard to imagine the hallman to be defective since it's a simple device.

2) as the pic above shows, the tuning shop engineer ( he has a degree, hehe) gave me 20 whp and +10 on torgue through ecuflash without the mbc. the only difference between the 2 runs is that I installed the walbro 255 tho it may not be a huge effect since I'm already running rich on the first baseline dyno run.

I noticed that my defi guages seldom goes above 1.0 bar (14 psi)... and I looked at his recorded run (via the defi controller), it only went to 1.2 bar for a split second. less than 18 psi.

He told me that more boost is not always more power and he did prove it on the dynojet. can anyone explain this to me? Thanks!

Any help would be appreciated

 

someone correct me if im wrong, but just b/c u crank the boost doen't make it safe which in turn can make the car start knocking,and then pull timing which will make u have less power

 

looks like you suffered from pulled timing right at peak torque on the run represented by the blue lines.

 

My Evo is the same version as yours (two BCS working in parallel) and I have no problem running the Hallman MBC @ 25psi. Did you check the install? There is a schematic somewhere around in Evom that shows how the install goes

 

thanks guys, it's just psychologically hard to reconcile seeing my boost guage needle not getting as high as before tho the car is actually running better. Butt Dyno and perception is not to be trusted. hehe....

On the time when my boost spiked to 1.5+ bar around, 21 psi, the whp gain was almost none existent. He said that it maybe beyond the turbo's efficient range. (tho tuning will definitely make use of this boost range)

the engineer also stressed that I changed the spark plugs asap to colder ones.

my hallmans make for nice paper weight right now

 

less boost, you can run more timing. And I do beleive that more timing is where the most power will lay at

 

hello!

I read the 2 diagrams in these forums and I think they installed it using the usual route which is turbo and wastegate. I think it's hard to get this wrong since any brand of mbc is installed this way, right? we haven't tried the bov to wastegate route yet but it may still not work and I'd be spending another 1-2 hours of wasted dyno time

25 psi... wow. i'm at 1.2 bar.... peak and just split second... I think it's just 16.8 psi. I wonder what he can do with 21 psi and above. I'm envious. hehe.

@sabastian, thanks for the info.... It must be excruciating for the engineer hearing my noob whining about needing more boost when he knows what he's doing.. but hey, that's part of his job.
nice sig/quotes btw.

 

Not that this hasn't been discussed before but more boost is not always the answer. It is the proper balance of modifications, fuel, timing and boost that make power.

 

More boost + the car knocking will deffo be slower than less boost + no knock.

What type of fuel are you running?

 

It's pump fuel rated supposedly at 95 octane... I live in Manila, Philippines so the standards/fuel rating maybe different. I think we have crap fuel over here

 

Lovely evo!

Find out if it is 95 RON or 95 PON.

Almost certainly you are on RON.

And 95 RON is not very good. It's equivalent to 91 PON I think.

I'd ask your tuner, was the car knocking when you ran more boost? If so, why was it knocking? You should be able to run more boost without knock if your tuner knows what he is doing. Will you make more power running more boost? Maybe not. But it shouldn't knock when you run more boost.

Sure you probably don't want to run 30 psi, but 18 seems a bit low. I might look for a new tuner.

 

It's possible to make good numbers with lower boost and more timing advance but trust me, your car will make more power and tq if it's tuned properly for 23-24psi than it will with lower boost.

 

Word. I'm seeing the stock timing advance at peak torque being too high to be running this much boost on 92 octane PON. For 95 RON it would be even worse...

 

thanks guys

crcain... I think it's RON so it's prolly 91. hehe...

and to Mr. evo ix and crcain, that's what I'm thinking too RE: the potential power with more boost.

Noob question.... tho my tuner asks this too: what can an MBC do that manipulation via ecuflash can't? thanks. (aside from on-the-fly the knob adjustment) could it bring the boost up
in a way that can't be achieved through ecuflash? thanks!

 

FWIW...

There is a self-tuner Evom member (I think in CA - so 91 octane) that swears he has tried every tuning combination and he makes the most power when tuned at 18psi. I can't find the post right now, however.

I know the instinctive thing to do is turn up the boost, but has anyone ever attempted some dyno experimentation at lower boost levels?