5.3L With Magna and Gt2-3 Plus LT's = Bad?
11-02-2009, 10:45 AM
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5.3L With Magna and Gt2-3 Plus LT's = Bad?
Hey Guys,
I just got off the phone with Lingenfelter asking questions about the GT2-3. I planned on added that with the LS6 springs and topping it off with a MP112 and LTs. The sales guy on the phone told me that the LTs would actually rob power from the MP112. Is that true? Would I get less power if I pulled my stock headers and put on LTs on this setup? Seems odd.
Kinda makes me wonder about the rest of the advice given from Lingenfelter. Can I just slide that GT2-3 in and put the LS6 springs in? What else should Consider with the Cam upgrade? Is there a better spring I should consider or 1.85 rockers?
Sorry about all the question, I just thought most of the advice from Lingenfelter was legit and Now I'm questioning it.
Thanks in advance.
DOA
I just got off the phone with Lingenfelter asking questions about the GT2-3. I planned on added that with the LS6 springs and topping it off with a MP112 and LTs. The sales guy on the phone told me that the LTs would actually rob power from the MP112. Is that true? Would I get less power if I pulled my stock headers and put on LTs on this setup? Seems odd.
Kinda makes me wonder about the rest of the advice given from Lingenfelter. Can I just slide that GT2-3 in and put the LS6 springs in? What else should Consider with the Cam upgrade? Is there a better spring I should consider or 1.85 rockers?
Sorry about all the question, I just thought most of the advice from Lingenfelter was legit and Now I'm questioning it.
Thanks in advance.
DOA
11-02-2009, 10:49 AM
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You're supposed to have a free flowing exhaust setup behind a supercharger, and i would go with some different springs like comp 918s or something of that nature.
Never heard of headers "robbing" power.
Never heard of headers "robbing" power.
11-02-2009, 10:54 AM
#3
I agree. On a S/C, u want free-flow of exhaust. On a turbo, a lil restriction helps boost.
IDK who u talked to, but I'm thinkin he's new. Got a name of who u talked to?
LPE know their stuff. But this one here I can't figure out, unless I'm missin somethin. I wonder if that GT2-3 plays better w/. a stock setup. I'm thinkin no, but I'm just bewildered on this.
IDK who u talked to, but I'm thinkin he's new. Got a name of who u talked to?
LPE know their stuff. But this one here I can't figure out, unless I'm missin somethin. I wonder if that GT2-3 plays better w/. a stock setup. I'm thinkin no, but I'm just bewildered on this.
11-02-2009, 11:00 AM
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His name was Ryan...... Hope he doesn't get in trouble. I think he may have said it because they don't sell LTs for the 07 Avalanche? I told him that I didn't plan on putting more into the truck than the MP112 and the Cam. Its got manga exhaust and Volant intake, but that's it. He said not to bother with LTs if you aren't going after more HP than that setup will give you....
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11-02-2009, 11:12 AM
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The GT2-3 is heavily exhaust duration biased. It's specs are 207/220 @ .050 .571"/.578" inches of lift with 1.7 ratio rockers on 118.5* "centerline" (not sure if they meant to say LSA or Intake Lobe centerline).
Look back in Trever1T's threads for when he switched from stock manifolds to headers and see the power he made.
There are 2 reasons I can think of that you were told not to install long tube headers. 1, they are not emissions compliant and LPE would not be advising anyone to install non CARB parts on their vehicle (I wouldn't think anyway). 2, their canned tune is optimized to work with stock manifolds, longtubes will lower your observed "manifold pressure" because they allow more air to flow with less restriction. This consequently could cause the engine to run lean if a custom tune is not applied. They don't want you blowing up your engine! The employee was just taking the safe route to giving you advice, you need to do more research and UNDERSTAND things before you just go adding parts to a "kit".
Look back in Trever1T's threads for when he switched from stock manifolds to headers and see the power he made.
There are 2 reasons I can think of that you were told not to install long tube headers. 1, they are not emissions compliant and LPE would not be advising anyone to install non CARB parts on their vehicle (I wouldn't think anyway). 2, their canned tune is optimized to work with stock manifolds, longtubes will lower your observed "manifold pressure" because they allow more air to flow with less restriction. This consequently could cause the engine to run lean if a custom tune is not applied. They don't want you blowing up your engine! The employee was just taking the safe route to giving you advice, you need to do more research and UNDERSTAND things before you just go adding parts to a "kit".
Last edited by ForcedTQ; 11-02-2009 at 05:40 PM.
11-02-2009, 11:17 AM
#9
You WILL lose boost.....BUT GAIN POWER. Boost is an amount of pressure measured by a MAP sensor in the manifold, not the cylinder so that means it is UNUSED air/fuel. By freeing up the exhaust (increase scavanging of the cylinders) the intake of combustable gasses in increased, lowering the pressure left in the manifold AFTER the valve closes 
Damn I learn a lot here
Damn I learn a lot here