GMT K2xx Trucks General Discussion 2014+ Trucks | General Discussion

2015 Sierra 2500HD Build

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Old Nov 19, 2014 | 07:01 AM
  #31  
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Picked it up last night. Should be getting a thumb drive in the next day or two with all the pictures and dyno graphs.

Currently the meth is turned off. When they started tuning the meth (50/50), at the very top (5800rpm) it started showing knock and pulling timing. Guess they ran it a second time and it repeated. They drained the system and went to 100% meth, same thing. So for now, going to run it without the meth being its only seeing 8.5psi while they figure out whats causing it to knock at the top. Hopefully have this figured out soon and when we swap pulley's add the meth.

I scaled the truck this morning on actual CAT scales. Truck, with me in it, and 36 gallons of fuel (had just filled up), weigh 7320lbs. Heading to work this morning did a quick 60-115 pull. Far from the fastest, but its definitely a steady pull.

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Old Dec 8, 2014 | 09:27 AM
  #32  
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Dropped the truck back off last night. They're going to re-plumb the meth directly into the blower. Also got a 3.00" pulley in, hoping to get up around 11-12psi (Currently on a 3.375 pulley seeing ~8.5)

Hoping everything works out. RPR is running its last session of the year Friday night and really wanting to make it out there to see just what it'll do.
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Old Dec 8, 2014 | 11:05 AM
  #33  
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That big tank is moving
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Old Dec 8, 2014 | 11:27 AM
  #34  
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Looks really strong for such a heavy truck!

When you say plumb the meth directly into the blower what do you mean exactly? Where is it routed to now?
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Old Dec 8, 2014 | 12:09 PM
  #35  
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It's currently routed about midway between air filter and throttle body, bottom side of intake tube.

The whipple casing has a couple ports that are blocked off, and they're going to try plumbing directly into one of those from what I've gathered. The thinking is that possibly the meth is to far away and is evaporating through the rotors. Hopefully going straight into the blower will get rid of the knock at the very top.
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Old Dec 8, 2014 | 12:23 PM
  #36  
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Originally Posted by JasonHD
It's currently routed about midway between air filter and throttle body, bottom side of intake tube.

The whipple casing has a couple ports that are blocked off, and they're going to try plumbing directly into one of those from what I've gathered. The thinking is that possibly the meth is to far away and is evaporating through the rotors. Hopefully going straight into the blower will get rid of the knock at the very top.
quite frankly I'm surprised that matters. I inject meth as far away from the blower as I can.

I'm not sure the engine cares whether its in liquid or gas form.
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Old Dec 8, 2014 | 12:34 PM
  #37  
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Possibly, but something is amiss. Not changing tune, it knocks above 5800rpm once spraying the meth.

I've never heard/seen it. Neither had they. And it's far from the first build of this type they've done. From what I gathered, Whipple was a bit puzzled as well. The suggestion was to move it into the blower, so that's what's being tried. Other option was to find a way and plumb it under the blower, but I'd rather not have the downtime involved with that currently.
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Old Dec 8, 2014 | 12:56 PM
  #38  
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Pulls really strong
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Old Dec 8, 2014 | 01:28 PM
  #39  
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Originally Posted by Choda
Pulls really strong
Thanks, definitely a huge improvement from factory. Can't wait to see what another few lbs of boost will make it feel like.
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