Duramax Diesels Forum Truck of the Week
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Old 03-13-2019, 08:14 PM
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Default Lb7 vs lbz mild built trucks

I know yíall probably get annoyed with me. Feel like Iím the little brother in here sometimes. Just a kid trying to find my way and I have a passion for these trucks and want a few of talks opinion. Iíve been talking with a very good and trusted friend of mine on this matter. That being said some of yíall remember my Lb7. Very mild build. 30 over injectors. Lbz supersoort pump. Built trans and heads were decked 10 thousandths. My new truck is an 06 lly with a 100horse tune.

That being said, my lb7 even on a 30 horse tune was much more violent and fun than this truck. I know a built trans plays a part on this, but thatís still a large power gap. My goal is to have a fun street truck thatís gonna make me smile. I donít want tame. I want scary. And the lb7 (tuned by tony) was just that. Biggest tune was a 150 and it was violent. Lbz seems more tame and from what Iíve read many people say this. Issue is, my job now may require me to be towing 10k+ very short distances from time to time. And I know a big twinned lb7 would struggle were a vgt twinned lbz would be fine.

I guess Iím looking for some opinions and insight from a bunch of people. Injectors donít scare me. Iíve done them enough. Parts are cheaper for an lb7 and I like the body style on the 01-02 much more than the cat eye. So, if in my shoes, what route would you go?
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Old 03-13-2019, 08:32 PM
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Im confused as to what your asking.
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Old 03-13-2019, 08:56 PM
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Quote:
Originally Posted by Rancelot211 View Post
Im confused as to what your asking.
Iím asking what others opinions are as to the feel of built lbz vs 01-02 lb7 trucks and what everyone thinks Iíll be happier owning.
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Old 03-13-2019, 09:01 PM
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All run similar once built, but I don't see why an lbz tuned correctly wouldn't be fun to drive on the street.

Mine isn't built, or scary, but the big tune is pretty useless around town in 2wd. Unless tire smoke is what you're after.
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Old 03-13-2019, 09:24 PM
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I think the LBZ is smoother than a LB7 and that might be what you’re feeling.
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Old 03-13-2019, 09:26 PM
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Iíve honestly never felt what you are feeling. I think you have underlying issues that need looking into

Weak trans or fuel system is going to make the truck feel weak.

In any case, either will do what you want and well. I tend to favor the lb7 just for the fact the pistons will take the abuse better and good tuning can make it live with twins. Plus 01-02 look the best
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Old 03-13-2019, 09:32 PM
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Quote:
Originally Posted by Chevy1925 View Post
Iíve honestly never felt what you are feeling. I think you have underlying issues that need looking into

Weak trans or fuel system is going to make the truck feel weak.

In any case, either will do what you want and well. I tend to favor the lb7 just for the fact the pistons will take the abuse better and good tuning can make it live with twins. Plus 01-02 look the best
Lies how long did your truck last with twins
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Old 03-13-2019, 09:33 PM
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I say lbz all the way , and lbz and tame cant be used in the same sentence, driving a 600+ hp lbz everyday puts a smile on my face good tunes with a big single charger or twin set up with supporting mods would be reliable and fun to tow with aswell.



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Old 03-14-2019, 04:10 AM
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They're all going to be fun, but Im partial to LB7s.
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Old 03-14-2019, 04:28 AM
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I can tell you mainly what you felt was the injectors making that difference being 30 overs. Each truck will feel different but I would say in stock format and if you tow a lot the LML is better. Thatís based on various improvements they made in steering, braking and frame. Iíve owned or tuned pretty much all of them. For a more refined truck take the lbz. The six speed and Vgt in compounds would make for a more pleasurable experience overall.


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Old 03-14-2019, 05:21 AM
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LLYs are freaks from nature for making big power with stock bottom end but also have many small issues compared to the others. Once building it then go lbz. No ficm or cups is awesome. Plus injectors last.
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Old 03-14-2019, 05:47 AM
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Quote:
Originally Posted by gmduramax View Post
I think the LBZ is smoother than a LB7 and that might be what youíre feeling.
VGT also comes on more "linear" per say, don't have to dig into the pedal as much to get the truck to come up on boost. Not saying a LB7 requires lots of pedal movement to come up on boost but the VGT is just smoother IMO.

Quote:
Originally Posted by Chevy1925 View Post
Iíve honestly never felt what you are feeling. I think you have underlying issues that need looking into

Weak trans or fuel system is going to make the truck feel weak.

In any case, either will do what you want and well. I tend to favor the lb7 just for the fact the pistons will take the abuse better and good tuning can make it live with twins. Plus 01-02 look the best
^^^^^THIS!!! Is your truck holding rail? How many miles are on it? The 5spd can be a finicky woman, sometimes they take a tune very well and other times they just lay over and die. He also is right you know, 01-02 do look the best
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Old 03-14-2019, 06:11 AM
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Thanks guys for all the input. I don’t know a ton about the truck I have now. I know my trans isn’t the greatest and not sure about rail yet. Truck now has around 230k on it. I’ve read where the 01-02 OS doesn’t limit power in any way. I guess what I’m feeling is the difference in fixed vs vgt. The lbz (lly) feels very smooth when the power comes on and that’s what I’m not used to. The lb7 was violent when the turbo lit and I loved it. And yes 01-02 look so much better. If I ever get it painted I’m gonna try to swap the front end. Don’t really wanna go fixed vane if I keep this truck.

Also, lml would be great but wouldn’t have one unless it was a 16 and that’s way over budget.
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1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inch lift and 35s.
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2018 GasGas XC300
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Old 03-14-2019, 08:07 AM
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15 or 16 is the same body. You can get a low mileage one for 40s.


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Old 03-14-2019, 10:17 AM
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I love my lml compared to my lmm. Iíve ran both fixed and modded vgts on the lmm. A lot of the scaryness your talking about comes from the fixed in my opinion. You put the pedal to the floor, hear the rail pressure rise, compressor start to whistle then bam hold on lol. My lml stock turbo even on stock trans is night and day better compared to the lmm. A lot could be tuning related though as well. Ppei tuned the lmm on vgt and Blake tunes my lml. The lml is no joke either at 550whp
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