04-28-2009, 08:31 AM | #1 |
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OK...What exactly is involved with a "tune"
Hi all,
I've been reading so much in the performance section of this site about all the bolt-ons and other stuff you can do to squeeze out more HP and in just about ever case, each discussion usually ends with "...and a good tune" as the final step in performance enhancements or add-ons. Can someone explain exactly was is involved with a tune? Do you take your car somewhere and have it hooked up to a computer or something for some mechanic to make fine adjustments to timing, fuel/air mixture, etc.? What is a "tune" these days?
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04-28-2009, 08:35 AM | #2 | |
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04-28-2009, 08:35 AM | #3 |
Drives: 2008 2500 HD; 2008 G8 GT #199 Join Date: Apr 2009
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The best thing to do is go to a reputable shop and have them do it on a dyno. Like you said, they fine tune different things on the ECM like A/F ratio, timing, etc. The dyno helps them make sure they get the most HP while still be safe to drive. There are other tunes that are the plug and play kind. But, each car is going to be a little different and everyone will have different mods so it really is best to get a custom tune from a reputable shop.
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04-28-2009, 08:37 AM | #4 |
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A laptop and brains.
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04-28-2009, 08:39 AM | #5 |
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best way is laptop/programmer and do it at the track. unless you just want to be a dyno queen
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04-28-2009, 08:39 AM | #6 |
Drives: 2008 2500 HD; 2008 G8 GT #199 Join Date: Apr 2009
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04-28-2009, 08:45 AM | #7 |
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Ok...so I wasn't too far off. Now the next challenge would be to find a reputable shop around here that does that sort of thing. I'm sure there is but I haven't had a chance to look around. Thanks for the explanation all.
__________________
DT Shorties, Solo hi-flow Cats, X-pipe, resonator delete, Flowmaster Super-44s, VMAX TB, Stronger MAF, C.A.I. Intake with race scoop, and JRE Tune!
WOT is my happy place!! |
04-28-2009, 08:45 AM | #8 | |
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If you are going to a shop to get a tune, they MUST have a floor dyno and get them to take a reading before the tune so you can compare before and after results.
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04-28-2009, 08:48 AM | #9 | |
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04-28-2009, 09:38 AM | #10 | |
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04-28-2009, 10:08 AM | #11 |
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Here we go......
Motors are a big pump. Every mod you do allows the motor to breath better. Now the stock pcm has a series of tables which control fuel delivery and spark based on various sensor readings, like air flow, intake air, oxygen, what have you. When you allow the motor to flow better, like with headers or more seriously a cam or blower, you have to compensate by adding and evening out the fuel and spark for the new airflow. This way the car runs well/smooth/safe. That's it in the most basic way I can explain.
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04-28-2009, 11:06 AM | #12 | |
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04-28-2009, 11:17 AM | #13 |
best tune is a "protune", thats when you take it to a dyno and have a dude with a laptop tune ur car and test the settings on the dyno. Every car is different, so you cant just buy a chip and get the best performance for your car.
Pro-tunes are expensive, but their well worth the money, for example after i installed my blower on my ls1 at 5psi i dynoed in at 410 rwhp with 390 torque, so i got it protuned, and after 3 runs on the dyno with my tuner experimenting with his laptop I was putting down 455rwhp and 420tq, thats a gain of 45 HP for only $400, best mod i ever did. |
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04-28-2009, 11:21 AM | #14 | |
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