Duramax Diesels Forum Truck of the Week
  #16  
Old 12-23-2013, 06:43 AM
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Quote:
Originally Posted by NC-smokinlmm View Post
With the converter locked and no downshift I will never hit 20 psi... Lol..

JK, but I sure won't get to anywhere near normal boost numbers and spoolup will be slowwwww...

I like the first idea better, I'm gonna give it a shot here shortly before it starts to rain...


That's why I said 10-15 psi.....

Testing turbo spool from a standstill proves or shows very little as converter selection will rule this test. That's why I suggested testing with a locked converter, everyone at the same start RPM, etc. If you don't take away as many variables as possible this test will with be worthless and a complete waste of everyone's time....


Don't believe me? My pulling truck will light the charger in less then 4 seconds (log proven) from an idle on the highway. Believe me, that charger is NOT streetable!
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  #17  
Old 12-23-2013, 07:13 AM
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Quote:
Originally Posted by IOWA LLY View Post
Don't believe me? My pulling truck will light the charger in less then 4 seconds (log proven) from an idle on the highway. Believe me, that charger is NOT streetable!
I'm assuming your converter it so loose it would be miserable on the street too?? Or just talking about revving through the roof with a manual? This is geared towards the daily drivers, not purpose built race/pull trucks. I guess I should have stated that in the beginning

I don't mind doing a test from a roll either, simply write a trans tune that won't down shift and agree to a 5th gear, 1500rpm pull or whatever seems feasible. I just want to see spool up, and both scenarios are useful.
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  #18  
Old 12-23-2013, 07:37 AM
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I'll do a log as soon as my Airdog is working again. New motor should be here this week.

From a roll would be interesting too. I could do 5th with the TCC locked, just gotta make sure no one is behind me. The vvts will have the advantage.
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  #19  
Old 12-23-2013, 07:56 AM
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I'll do one the next time I drive mine. I have a dyno tune that holds 5th lockup in T/H
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  #20  
Old 12-23-2013, 08:10 AM
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Quote:
Originally Posted by coker6303 View Post
I'm assuming your converter it so loose it would be miserable on the street too?? Or just talking about revving through the roof with a manual? This is geared towards the daily drivers, not purpose built race/pull trucks. I guess I should have stated that in the beginning

I don't mind doing a test from a roll either, simply write a trans tune that won't down shift and agree to a 5th gear, 1500rpm pull or whatever seems feasible. I just want to see spool up, and both scenarios are useful.
he has a good point Russ, i do like your test though! brian, sean and i were jsut talking about testing this with others yesterday.

Here is my feed back on my stock turbo over my s475 with batmowheel/Yellowchevy upgrade.

At 60mph, 5th gear TC locked, 1500rpm, no load and without letting it down shift, i can hit 20psi at just over a second but its also building 1-2psi of boost before rolling into the throttle. its hard to be "out of boost" so to speak on my setup.

ill see if i can get a log now but i just swapped to 4.56 gears so its REALLY hard to get it out of boost now. i was almost borderlined before due to the longer time between shifts



This whole test your doing is something i was trying to figure out a long while back before i did twins. i finally got Andrew on here to do a loaded test with his truck (bascially the same as mine but with 35s and triple turbos with a 366 as the high pressure). under the same circumstances as i said above but loaded, he could not get boost to build until 1800 rpm. that right there answered my question on whether or not id ever jump up in charger size (i wont).
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  #21  
Old 12-23-2013, 08:15 AM
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I'll try to look through my logs tonight and see how the 366 did
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  #22  
Old 12-23-2013, 08:46 AM
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Quote:
Originally Posted by Chevy1925 View Post
he has a good point Russ, i do like your test though! brian, sean and i were jsut talking about testing this with others yesterday.

Here is my feed back on my stock turbo over my s475 with batmowheel/Yellowchevy upgrade.

At 60mph, 5th gear TC locked, 1500rpm, no load and without letting it down shift, i can hit 20psi at just over a second but its also building 1-2psi of boost before rolling into the throttle. its hard to be "out of boost" so to speak on my setup.

ill see if i can get a log now but i just swapped to 4.56 gears so its REALLY hard to get it out of boost now. i was almost borderlined before due to the longer time between shifts



This whole test your doing is something i was trying to figure out a long while back before i did twins. i finally got Andrew on here to do a loaded test with his truck (bascially the same as mine but with 35s and triple turbos with a 366 as the high pressure). under the same circumstances as i said above but loaded, he could not get boost to build until 1800 rpm. that right there answered my question on whether or not id ever jump up in charger size (i wont).
My turbo setup doesn't really come on hot until 1800rpm when cruising in lockup. For my use I would have been happier with the stock/475 setup for sure, but hindsight is 20/20.

I'll try to get a log from a locked roll in 5th at 1500rpm today.

Maybe we should make a list with turbo(s), converter and then time result of both test so a chart of the different combo's can be somewhat usable for those looking at upgrading.
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  #23  
Old 12-23-2013, 08:49 AM
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That would be great if we get enough true info
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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  #24  
Old 12-23-2013, 10:12 AM
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I think from a dead stop mine doesn't hit 20 pounds of boost until half way through second gear
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  #25  
Old 12-23-2013, 10:43 AM
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Ill do mine in a minute. Idk how to get a log on here though.
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  #26  
Old 12-23-2013, 11:23 AM
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Default **CHALLENGE** - TURBO LAG TEST using a log

Mine shows to be 1.98 seconds. From 14.8-35.2.
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Alive 11/15/13: lowered, Built motor, s475, plenty of fuel, plenty of spray. Tune 3 fuel only 11.84 @114, Tune 5 little bit of spray 11.45 @ 121. Both times with melted turbine wheel, loose turbo from pedestal with blown out flange gasket. .
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  #27  
Old 12-23-2013, 11:26 AM
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EFIlive dsp5 by me, Built trans by me, 68 danville, stock fuel, lifted. died 6/20/2013 Cracked piston. Best time 12.75 on fuel

Alive 11/15/13: lowered, Built motor, s475, plenty of fuel, plenty of spray. Tune 3 fuel only 11.84 @114, Tune 5 little bit of spray 11.45 @ 121. Both times with melted turbine wheel, loose turbo from pedestal with blown out flange gasket. .
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  #28  
Old 12-23-2013, 11:29 AM
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And this is from a 60 mph roll, no downshift tow haul on. 1.26 seconds.
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Alive 11/15/13: lowered, Built motor, s475, plenty of fuel, plenty of spray. Tune 3 fuel only 11.84 @114, Tune 5 little bit of spray 11.45 @ 121. Both times with melted turbine wheel, loose turbo from pedestal with blown out flange gasket. .
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  #29  
Old 12-23-2013, 11:32 AM
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I use to do that test that Iowa suggests all the time .

1) I had the cops at my house something about a road rage incident!
2) That was back when smoking was cool!
3)
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  #30  
Old 12-23-2013, 01:17 PM
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Quote:
Originally Posted by quinton View Post
Mine shows to be 1.98 seconds. From 14.8-35.2.
Why did you start your highlighting at 1631 RPM?

Quote:
Originally Posted by quinton View Post
And this is from a 60 mph roll, no downshift tow haul on. 1.26 seconds.
Are you in 4th gear here? 2385 RPM at 60 MPH?
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