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How far can you go?

 
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cmarr6
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Joined: 08 Feb 2013
Posts: 27
Location: West Point, NE
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PostPosted: Thu Jul 27, 2017 1:36 pm    Post subject: How far can you go? Reply with quote

How much engine modification can you make before you have to start retuning the computer???? I have a 2005 avalanche that has started the dreaded cam and lifter squeal. Will have to replace the cam and lifters and was wondering if I can go with a little bit bigger cam without retuning the computer. And maybe a little head work and some headers.
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
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1969 Oldsmobile Cutlass

PostPosted: Sun Jul 30, 2017 11:50 am    Post subject: Reply with quote

low speed and idle driveability will suffer to some degree. the computer can compensate quite a bit but its always best to do a tune. most noticeable will be cold start and idle. besides, you will get much better gains if you tune to the upgraded parts. its kind of a waste if you dont.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Mon Jul 31, 2017 2:17 am    Post subject: Reply with quote

What motor? 5.3 or 6.0?

Bigger displacement is more forgiving.

My 5.7 needed to be tuned to run with a small cam, 221/221 114LSA. It idled like crap after the cam swap.

I wouldn't go bigger than a factory ls1 z06 cam on a stock computer (no tune).

But as 10sec.et stated a good tune is needed to take full advantage of the combo.

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cmarr6
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Location: West Point, NE
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PostPosted: Mon Jul 31, 2017 6:08 am    Post subject: Reply with quote

Yea, that was what i was thinking, maybe a Z06 cam or something in that range. Not a BIG jump in lift or duration, just a little bump. I gotta replace the cam anyway, had a lifter go bad and am sure that it has ruined a lobe of the cam also. Just want to bump it up a little without having to upgrade a bunch of other things also. I know how that can be. It is my wife's DD and need it back on the road as quick and cheap as possible right now. Don't want to do headers, and tune and springs etc. etc. Just want a little bump in performance while I have it tore apart. I would still need to change the springs with the Z06 cam, right? I plan on putting new ones in anyway, but will upgrade if needed.
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cmarr6
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Location: West Point, NE
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PostPosted: Mon Jul 31, 2017 6:09 am    Post subject: Reply with quote

Sorry, didn't say, but it is a 5.3
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Wed Aug 02, 2017 12:44 am    Post subject: Reply with quote

Hot rod did a good write up on the cam swap on a 5.3.

Check it out here. http://www.hotrod.com/articles/ls-cam-test-comparison/

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10sec.et
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Joined: 29 Mar 2006
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1969 Oldsmobile Cutlass

PostPosted: Wed Aug 02, 2017 10:40 pm    Post subject: Reply with quote

until i started tuning, i had no idea how much difference there was in the tunes from one vehicle to the next. sometimes drastically different VVE tables. its really hard to say how its going to behave when you change the cam. i doubt it will be anything obnoxious. probably have a weird idle and part throttle. if shes driving mostly in town from stop light to stop light, it may be cumbersome but highway would be a different story.
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Thu Aug 03, 2017 9:59 am    Post subject: Reply with quote

Just to add to this. With a stock engine if you went out and bought a tuner with a pre-loaded set of tunes like 93 Octane, 91 and 89 Economy. You would be amazed at the improvement in the car with just that. The factory tunes the car for the shit fuel because it protects them from warranty issues. I noticed this on my 2 liter Ford Focus so a bigger engine would show even more dramatic improvements in power.
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stock cams, bolt-ons and tune
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1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
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1969 Oldsmobile Cutlass

PostPosted: Thu Aug 03, 2017 12:15 pm    Post subject: Reply with quote

yep. the factory tune has several tables for timing related to fuel. bumping those tables, with good fuel, will definitely show improvement in power.
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