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Old 05-26-2013, 05:25 PM
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boost #s for MTW stage 1 turbo

So I am getting pretty close to finishing up my build...

it is up and running and I am just working on a couple of small things. My question today is about psi numbers for the MTW stage 1 turbo. I am running 175cc nozzles with the MTW stage 1 turbo. I have custom tunes from Eric at innovative.

I ran the new 175cc injectors with the stock turbo and with the new MTW stage 1 turbo. They both hit the same psi numbers (29psi) and the new turbo does not seem to make any difference. Not in the seat of my pants and it does not seem to clean up the smoke either. At WOT it looks like a freight train.


I have followed a couple of build threads and people talk about numbers in the 40-50 psi range... Also I thought 175cc with stock nozzles would be nothing for the MTW stage 1



Here are my questions:

What PSI numbers should I be seeing with my setup?

Should the MTW stage 1 be able to clean up the 175cc injectors?

Is there a way to turn up the PSI? Like a boost fooler on the 7.3, or request the tuner to change the VGT cycles?

Could the computer be limiting the boost numbers? Does it cap out at 30 psi?
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Old 05-26-2013, 05:47 PM
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The tune is everything. I used to have low boost numbers with IDP tunes. I don't use them anymore. My DP tow tune hits 32psi my performance tune hits near 40. I would say 175s are right at where a hybrid might be required. My S1 billets only slows smoke down low then cleans up 155s. I would try a couple other tunes as your next course of action. I'd try php or DP tunes, or tell IDP to turn up the boost. To turn up boost they have to increase back pressure which increases EGTs a bit, but on the other hand if the airs not keeping up with fuel then that causes high EGT too, so you have to find the balance.
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Old 05-26-2013, 05:55 PM
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Around 33psi is what one of my friends saw with srl tune and stock injectors. I don't quite see how a billet wheel as small as these are can hit that kind of pressure. He did see some increase in performance all around.

That turbo is too small for those injectors, the hybrid would be the minimum to run with those.
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Old 05-26-2013, 05:57 PM
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I'd say its your tune. I have 175 stock nozzle and stage 1 and I only get smoke when I mask it. Then it cleans up perfectly. Again boost isn't everything. I had one tune make 37lbs of boost and another make 29lbs. My 29 feels stronger. Personally I like Gearhead tunes. I haven't even run his race files yet (srl+,srl++) and my truck feels very strong
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Old 05-26-2013, 06:00 PM
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I have been looking into tunes a lot...

Eric at innovative was last on my list, but after speaking with Adrian at MTW he recommended them???

I have been thinking about trying PHP, Quick Tricks, and gearhead.

I will have to look into DP tunes



Anybody have the same setup/similar setup and have any advice on tunes?
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Old 05-26-2013, 06:08 PM
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Where are you reading boost from? The factory gauge/map sensor typically only registers to about 30 lbs. I have a hybrid and it only registers to 30.
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Old 05-26-2013, 06:10 PM
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Like I said I have your exact set up and am using matt. Boost comes on very strong and fast, cleans up well and shifts are on point
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Old 05-26-2013, 06:14 PM
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i would think its the tune. change tuners? ive had many tunes and i disliked IDP the most. try tony wildman or matt from gearhead or vivian from quick tricks
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Old 05-26-2013, 06:32 PM
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I am using sct livewire to read boost off stock MAP sensor

I am going to try a couple of different tunes. Maybe all is normal but I thought I would post a video showing the smoke
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Old 05-26-2013, 06:33 PM
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