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04.5-05 LLY Performance Discussion of Chevy and GMC Trucks with LLY Duramax Turbo Diesel Engines Related To Performance And Longevity

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So I have messed with most areas on my truck and some have been improvements, others not so good. What have you found to be the best mod over all? Mine would have to be the exhaust or my boost stick. I have a 304SS ... JOIN NOW TO REMOVE TRACER

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  #1  
Old 07-30-2007, 04:42 AM
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So I have messed with most areas on my truck and some have been improvements, others not so good. What have you found to be the best mod over all?

Mine would have to be the exhaust or my boost stick. I have a 304SS Silverline 4" catless exhaust and I picked up 2 mpg with that right out of the box. The boost stick made my fuel milage jump up at first, but has come down a bit, probably because I am more into the gas with the predator 40hp installed. The boost stick also helped me to achieve 1250* max EGT's when earlier I could bury it into the 1500* mark and make my ECT gauge fluctuate faster than the speedometer, but it never puked its coolant.

The lift kit did wonders with the looks along with the 315's but killed the fuel milage. Mine would be in the low 20's average (I drive a lot of highway) but now 17 is a good day.

A TxC CAI may be next for me just for grins as they say it helps cool EGT's and ECT's and most of all, improve fuel milage, so it looks like a no brainer. Just need the $$ laying around.

What have you guys found?

Reineke's Sig:2005 2500HD Silverado LS Duramax/Allison CC/SB -- I think I'm done modding it now...
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  #2  
Old 07-31-2007, 11:29 PM
Aaron
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I would have to say the programmer due to the added fuel economy.

TCU Fan's Sig:Our opinions, once meant something, now not so much. Think what you want, but the reason for some change is different then you may realize.
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  #3  
Old 08-14-2007, 03:20 PM
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if you want good fuel economy crank that pred all the way up, i can get 25 mpg highway (hand calculated) just be careful not to burn up the tranny

tobyk321's Sig:[SIGPIC][/SIGPIC]2005 lly crew cab long bed, k&n filter, mbrp 4" turbo back (not cat), egr blockoff plate
nitrous, suncoast IV/1056
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  #4  
Old 08-21-2007, 01:39 PM
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I would have to say the PPE. Haven't tried the other settings yet. The 90HP really woke it up. Mileage jumped from 18 to 22 hand calc. The 5" MBRP was already on when I bought it, so I can't compare. It sure sounds nice, though.

RodZZilla's Sig:2005 K3500 CCLB. MBRP 5", PPE Hot+2, Retrax Tonneau Cover, N-Fab 6 Step Bars, Toyo 295/17's on 08 Chevy Aluminum Rims, Reese Signature Gooseneck.

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  #5  
Old 08-21-2007, 01:45 PM
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All the mods I did have their own perks

the AERO was a good investment and I like the sound.
But the DIABLO programmer was the best overall. Which I am hating to sell.

For the money the ROKK tech was a good one as well. I notices a slight power increase and fuel efficiency increased.

GRI's Sig:08 Ford crew cab, 6.4l high idle mod. That's it for now.
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  #6  
Old 08-22-2007, 06:15 PM
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WhiskeyRiver took my mind
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Originally Posted by GRI View Post
the AERO was a good investment and I like the sound.
Do you have any sound clips? I have been thinking of switching to an Aero. Did you notice any mileage increase?
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  #7  
Old 08-27-2007, 08:33 PM
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EFI-Live tuning, 4.10's in the rear, CO-PILOT, 5-Star Torque Converter. they all make a huge difference. If you ever want to build your transmission, I can set you up with a killer tune. I've been working on one for a while. Its pretty nice. If you just want a little power and some fuel economy, I've been pleased with Cit's 60Hp tune, but I limped my stock transmission with it.

ranger22's Sig:2005 GMC K2500HD Crew Cab Short Bed
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  #8  
Old 09-24-2007, 06:10 PM
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I like the twin turbo's now, but my favorite mod when it was stock....Edge box hands down!!

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  #9  
Old 09-24-2007, 08:30 PM
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PPE hot+2 nad I really like my 4" MBRP straight piped exhaust.

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2006 2500HD LBZ D/A ext cab Greystone metalic- autometer z-series pyro and boost gages- Egr blocked and fingered-BD Max Flow lift pump-PPE HOT+2- turbo back 4" MBRP, with muffler delete pie exhaust(lost kitty )
265/75/16 Firestone destination MTs . Tie rod sleeves
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  #10  
Old 09-26-2007, 05:16 PM
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Boost stick would have to be my best mod for the money!

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We carry all major brands, if you don't see it just ask. We carry parts from AFE, Airaid, Arp, Autometer, BD Diesel, Bully Dog, City Diesel, DiabloSport, Diamond Eye, Diprocol, Dynomite Diesel, Edge, Efi live, Fass, Fluiddampr, Hamilton Diesel, Hawk Performance, HTT, Industrial Injection, Isspro, Smarty, Magnaflow, Mbrp, Pacbrake, PDI, PPE, Prw, PML, Pure Flow Technologies, Quadzilla, Recon, RBP, Snow Performance, Southbend Clutch, Stampede, Stanadyne, Steinbauer, Suncoast, Superchips, Titan Fuel Tanks, TS Performance, Vulcan Performance, Valair Clutch and many many more!!!

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