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2001 LB7 silverado 2500HD
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Discussion Starter · #1 ·
Hey! I have a 2001 lb7 and I was wondering what the best tune would be if I straight piped it. I know that if I straight pipe it, that the more air will bog down the motor and I was wondering what the best tune would be. I just daily drive it and I hardly ever tow anything.
 

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Search Google..
If it's an illegal tune, you'll find nothing here..
 

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2017 GMC Denali 2500HD, 3.5" Rough Country Lift, 305/55R20 Yokohama Geolandar A/T
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Hey! I have a 2001 lb7 and I was wondering what the best tune would be if I straight piped it. I know that if I straight pipe it, that the more air will bog down the motor and I was wondering what the best tune would be. I just daily drive it and I hardly ever tow anything.
The more air will bog down the motor??? That's not how this works....

The best tune for a daily driver that doesn't tow is the stock tune. Save your money for injector replacements.
 

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The more air will bog down the motor??? That's not how this works....

The best tune for a daily driver that doesn't tow is the stock tune. Save your money for injector replacements.
And spend a little more for the SACs and only do it once.

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2001 LB7 silverado 2500HD
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Discussion Starter · #5 ·
The more air will bog down the motor??? That's not how this works....

The best tune for a daily driver that doesn't tow is the stock tune. Save your money for injector replacements.
Yes my coworker was telling me that if you don’t have enough back pressure and upgrading the exhaust an inch and a half would cause the engine to bog down and wouldn’t perform to its peak capacity. I’d like to get it straight piped because I like how the lb7 sounds straight piped.
 

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Straight piped LB7 would require no tune unless you want one.
 
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Yes my coworker was telling me that if you don’t have enough back pressure and upgrading the exhaust an inch and a half would cause the engine to bog down and wouldn’t perform to its peak capacity. I’d like to get it straight piped because I like how the lb7 sounds straight piped.
With a gas motor, you want some back pressure. On a diesel, a straight pipe can help keep temps down and arguably helps the truck perform better to a certain extent. It also sounds cool to hear the turbo spool up.
 

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Yes my coworker was telling me that if you don’t have enough back pressure and upgrading the exhaust an inch and a half would cause the engine to bog down and wouldn’t perform to its peak capacity. I’d like to get it straight piped because I like how the lb7 sounds straight piped.
LOL... Your coworker doesn't understand how a turbo diesel engine works then...
 
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So the LB7 has no factory emissions therefore requires no tuning to change the exhaust and tunes are completely legal as there are no emission components to remove. The more air that comes in and goes out the better. I would personally get an S&B intake and maybe MBRP 4" exhaust. See how you like that. If you want more, research into tunes. I would leave it factory tuned though.
 

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2001 LB7 silverado 2500HD
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Discussion Starter · #10 ·
LOL... Your coworker doesn't understand how a turbo diesel engine works then...
My coworker was a diesel mechanic so I was just repeating what he was saying. I may have said it wrong tho but he was saying that it needs to be tuned otherwise it won’t perform to its peak capacity
 

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Discussion Starter · #11 ·
So the LB7 has no factory emissions therefore requires no tuning to change the exhaust and tunes are completely legal as there are no emission components to remove. The more air that comes in and goes out the better. I would personally get an S&B intake and maybe MBRP 4" exhaust. See how you like that. If you want more, research into tunes. I would leave it factory tuned though.
I haven’t thought about an intake yet but I’m thinking a 5” exhaust would sound pretty good
 

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We’ll not bashing your coworker but he might be a little confused, everything everyone’s already said I second and third it! You can put a hood stack on it an you don’t need a tune of any sort, just put a 4 or 5 inch exhaust on it an call it a day, if ya what a little more whistle pick up an aluminum intake. You’ll be satisfied with that set up if you want it loud in the back an loud in the front!
 

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I haven’t thought about an intake yet but I’m thinking a 5” exhaust would sound pretty good
The "older" diesels typically benefit from an intake more more than new gens (but I admittedly have not research the LB7, but I know by 7.3PS of the same year greatly benefited from a CAI). You most likely will not see a performance gain with 5" vs 4" exhaust, just a sound difference. Both will sound good.
 

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My coworker was a diesel mechanic so I was just repeating what he was saying. I may have said it wrong tho but he was saying that it needs to be tuned otherwise it won’t perform to its peak capacity
Just because he was a diesel mechanic, doesn't mean he was a good diesel mechanic. An engine with a turbo gets all the backpressure it will "need" from the turbo itself. The more free flowing after the turbo the better. Of course, an aftermarket tune may give better throttle response and more power, but too much power will lead to damage.
 
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Discussion Starter · #15 ·
Just because he was a diesel mechanic, doesn't mean he was a good diesel mechanic. An engine with a turbo gets all the backpressure it will "need" from the turbo itself. The more free flowing after the turbo the better. Of course, an aftermarket tune may give better throttle response and more power, but too much power will lead to damage.
Yea no I have no clue how good he was I was just repeating what he was saying. I certainly don’t want anything to break or be damaged on the truck and I want it to perform as good as it does now, and I don’t really care about the performance gain at the moment I just want the sound. I may get an intake later on down the road but as of now I just want the sound
 

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If you get a bigger intake then you would benefit from a tune to compensate for more air flow.
 

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And spend a little more for the SACs and only do it once.

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When you talk about SACs, I have recently read the 00s are not proven. Do you know what the "not Proven" part means. Are they failing are the complaints just bad fuel mileage? I installed them a year ago almost to the day. Now i am reading the 00's arent proven but the 45s are.....W/O bombarding Brent i was wondering if someone here knows more....

Thanks in advance
 

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When you talk about SACs, I have recently read the 00s are not proven. Do you know what the "not Proven" part means. Are they failing are the complaints just bad fuel mileage? I installed them a year ago almost to the day. Now i am reading the 00's arent proven but the 45s are.....W/O bombarding Brent i was wondering if someone here knows more....

Thanks in advance
I was talked into the 45s for that reason. I wish I went 00. That was over a year ago. They may be more proven now. I'd talk to LDS to get accurate info.

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I was talked into the 45s for that reason. I wish I went 00. That was over a year ago. They may be more proven now. I'd talk to LDS to get accurate info.

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Thanks,

Whats with the 45s I was thinking i should have gone to the 45s. I went from 16mpg w/ a turbo timer ( it idles for 10 sec at shut down) to 10.9 MPG. If thats the worst thing and this truck/ Injectors take me to 500k I would be completely happy/
 
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Hmm bowtie67, I think this is the first time I’ve seen someone mention something semi bad about LDS. An you mention the loss of fuel milage, you have a good point if they last a lot longer in between replacing them but then again, if you’ve lost 5mpg (roughly) say they do last an extra 50k miles how much extra in fuel have you used?
not trying to derail this or anything since it kinda is, you can pm me, but I’m pretty curious

edit: I totally get it if your doing the injectors yourself, I’d take 5MPG if I could get 500k out of them 😂😂 it’s a job I’ve done once on mine an it went great besides me just not having all the tools (quality tools At that)
 
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