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how to get some more power out of a 5.3

More power from a 5.3l

how to get some more power out of a 5.3

Postby sierra07 [OP] » Oct 02 2012, 8:39pm

I am new to this website and was wanting to see if anyone had some good suggestions of what to put on my engine to get more power out of it. I already have a k&n cold air intake, exhaust system, throttle body spacer, and Edge programmer. And I don't want to spend too much on it but I am open to any suggestions. I would like to get around 400-425 hp out of it. Can my stock transmission and rear end handle that much power? Thanks
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how to get some more power out of a 5.3

Postby Machster69 » Oct 02 2012, 9:12pm

To get that kind of horsepower, your going to need more than bolt on mods. Your going to need real engine mods and premium fuels... But i can assure you that tb spacer is a placebo at best!
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Re: how to get some more power out of a 5.3

Postby RedHorse 823 » Oct 02 2012, 9:20pm

Need to ask why 400+hp? More power for better take off? Or towing? Highway top end speed?
Better towing and increased take off power you could change the gears.
+1 on TB spacer--Kyle is 100% right
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Re: how to get some more power out of a 5.3

Postby sierra07 [OP] » Oct 02 2012, 9:49pm

Alright.I see your point so what other bolt on stuff can I put on to get some more power out of it. the 400 hp was just a ball park figure. I am just looking for good throttle response and to be a little faster off the line.
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Re: how to get some more power out of a 5.3

Postby camfire87 » Oct 02 2012, 10:06pm

want a bolt on for lots of hp? One word: supercharger.

As for your driveline, no your tranny won't handle that kind of power. Right out of the box GM trucks are equipped with a torque management system that only allows so much power to be put through the tranny at one time just for that reason. It certainly helps with longevity, but it's kind of lame for those of us who love to feel all the horsepower that 5.3 has (guys who really build up their trucks will always get this disabled). The stock tranny is really pretty weak, and only designed to handle the power that a stock 5.3 puts out. Your rear end will be able to handle a it ok I would imagine, but I don't know enough about these specific diffs to say for sure. I'd probably bet that 400+ hp would make it whine pretty good though.

I've posted this before, but it's a good read, and a quick way to get well over 400 hp out of your 5.3l
http://www.carcraft.com/techarticles/cc ... ewall.html
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Re: how to get some more power out of a 5.3

Postby sierra07 [OP] » Oct 03 2012, 1:59am

That's what I was afraid of... so I will just forget about the 400 hp with bolt on parts. But what can I get? And I still don't want to put a ton of money into this truck. I might be asking a question that there isn't a good answer to. Is what I've done to it about all I can do with bolt on's with out killing my tranny? And would it be a good idea to have the torque management system disabled or is it more risk than its worth? I'm sorry I know I'm asking a lot of questions.
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Re: how to get some more power out of a 5.3

Postby RedHorse 823 » Oct 03 2012, 2:05am

If throttle responce and off the line is what you want, change the gears. What are you running now, 3:42?
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Re: how to get some more power out of a 5.3

Postby sierra07 [OP] » Oct 03 2012, 2:40am

I'm not 100% sure but I think its 3:73 or at least thats what my programmer says. And I don't want to kill my already crappy fuel mileage.
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Re: how to get some more power out of a 5.3

Postby Chasmanian » Oct 03 2012, 2:55am

Upgrade to a bigger throttle body?
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Re: how to get some more power out of a 5.3

Postby kemo » Oct 03 2012, 3:03am

The only way you are going to get there is to do some work to the motor...

You have to build up the motor to boost it. Or if you want to go the normally aspirated route, you have to quite a bit of work to the motor just to get it to put out those numbers on its own.

I'm assuming you have the 4l60E. That tranny is going to need some work to it too just to get it to hold up.

Piddly things like a cold air intake, or bigger throttle body will not get you there.

And since you don't want to kill your fuel mileage, you aren't going to be happy either way, since making these modifications to get you there will require more air into the engine to get there. More air will require more fuel. Simple equation there results in lower fuel mileage.
Last edited by kemo on Oct 03 2012, 3:12am, edited 2 times in total.
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