So I just learned

"Logansteno: Bought a VW?" (logansteno)
09/02/2014 at 21:04 • Filed to: None

The tune on my dad's Silverado raises the power level from 295 horsepower to about 360.

I didn't expect it to be that much.

That's more power than the brand new 5.3 makes. Even though I'm sure that's tunable to about 400.

That might explain why it has to run on premium.

Hooray tunes.

DISCUSSION (37)

PetarVN, GLI Guy, now with stupid power > Logansteno: Bought a VW?
09/02/2014 at 21:09

can't wait to tune my GLI. make it as fast as I can! :D

Logansteno: Bought a VW? > PetarVN, GLI Guy, now with stupid power
09/02/2014 at 21:10

Because you'd get your ass handed to you by a truck right now? xD

 > Logansteno: Bought a VW?
09/02/2014 at 21:10

Kinja'd!!!

PetarVN, GLI Guy, now with stupid power > Logansteno: Bought a VW?
09/02/2014 at 21:11

oh no, I don't mind that your car is faster. I got my ass handed to me by a '94 Z28 last Saturday. What I do know that when the road starts curving, you'll shit your pants and i'll just plow on through at 50,60,70... mph

Logansteno: Bought a VW? > PetarVN, GLI Guy, now with stupid power
09/02/2014 at 21:12

Hate to break it to you friend, but I've taken corners at 40 in the wet. I might be on my door handles, but dammit I can take corners at 40.

jkm7680 > Logansteno: Bought a VW?
09/02/2014 at 21:13

Not bad! We need a 0-60!

IDROVEAPICKUPTRUCK > Logansteno: Bought a VW?
09/02/2014 at 21:14

I am always very suspicious of "tunes" on Naturally Aspirated engines. Sure they can adjust the fuel map some or raise the rev limit but assuming that the stock tune is set to achieve stoichiometric efficiency what exactly is the tune doing other than raising the rev limit? Also why the need for Premium Fuel? Premium fuel helps prevent pre-detonation, but unless you've raised the compression ratio that shouldn't be an issue right?
Am I way off base here? Someone help me out.

Logansteno: Bought a VW? > jkm7680
09/02/2014 at 21:14

If the truck had gas in it I'd do it!

But alas, no fuel.

DoYouEvenShift > Logansteno: Bought a VW?
09/02/2014 at 21:15

I dont see that happening man. A good tune on a truck 5.3 is good for about 20 tops. 65 hp from a tune alone is FI territory.

GhostZ > Logansteno: Bought a VW?
09/02/2014 at 21:15

Hooray factory underrated and detuned engines! Making cheap HP accessible to us all!

GhostZ > PetarVN, GLI Guy, now with stupid power
09/02/2014 at 21:16

Ironically, the Z28 probably corners as well as the GLI, if not better.

Logansteno: Bought a VW? > IDROVEAPICKUPTRUCK
09/02/2014 at 21:16

All I know is that my dad plugs a magic box into his OBDII port and it alters shift points, redline, and throttle response at least. You can feel a difference in it.

There's a menu to program what fuel it uses, so it must do something.

Logansteno: Bought a VW? > GhostZ
09/02/2014 at 21:18

Probably was detuned from factory.

GhostZ > Logansteno: Bought a VW?
09/02/2014 at 21:18

Definitely was.

ly2v8-Brian > GhostZ
09/02/2014 at 21:19

Exactly, Camaros, Z/28 in particular, have always been fairly good handlers.

Jordan and the Slowrunner, Boomer Intensifies > Logansteno: Bought a VW?
09/02/2014 at 21:19

4 wheel launch, I would guess in the higher 6's with the tune.

sm70- why not Duesenberg? > Logansteno: Bought a VW?
09/02/2014 at 21:20

Try a 0-60 in that. I bet it will beat 12.38 years seconds.

GhostZ > ly2v8-Brian
09/02/2014 at 21:20

Not all camaros, but the fourth-gen Z28s were legitimate performers. Them, along with the Trans Ams, were probably the most feared "cheap HP" street car prowling around the early/mid 2000s.

Logansteno: Bought a VW? > sm70- why not Duesenberg?
09/02/2014 at 21:21

Noshitsherlock.

By how much though...

IDROVEAPICKUPTRUCK > Logansteno: Bought a VW?
09/02/2014 at 21:22

Okay shift point and rev limit sure, but unless you've changed the compression ratio of your engine then premium fuel is just a waste of money.

sm70- why not Duesenberg? > Logansteno: Bought a VW?
09/02/2014 at 21:22

Don't be expecting to run 5s, but you might very well be below 8.

Logansteno: Bought a VW? > DoYouEvenShift
09/02/2014 at 21:23

There's probably some upgraded engine parts in there somewhere. The whole truck has a bunch a custom work on it (obviously)

Never saw a list of what was done though.

Logansteno: Bought a VW? > sm70- why not Duesenberg?
09/02/2014 at 21:25

I'm gonna say it breaks into the sevens.

We'll all find out eventually.

Logansteno: Bought a VW? > IDROVEAPICKUPTRUCK
09/02/2014 at 21:26

Hey, my dad's personal choice, not mine. I'd put regular in it if it was up to me.

ly2v8-Brian > GhostZ
09/02/2014 at 21:30

Third gen wasn't to bad either. The 1LE was a good example of this, but rare.

jlmounce > IDROVEAPICKUPTRUCK
09/02/2014 at 21:51

Engines run stoic only under ideal and cruise operation. Stoic would be dangerously lean during full load wide open throttle operation. To combat things like poor quality fuel, heat and humidity and lead feet, it's not unheard of for manufacturers to tune engines down to around 10:1. Even on a naturally aspirated engines. A basic electronics tune is going to command closer to 12:1 air/fuel ratio during g high load operation. It's also going to alter timing tables, throttle by wire events and transmission events where applicable.

The increase in timing is the reason for the added octane requirements. Adding spark advance increases torque at the expense of pre ignition.

With that said. The figures being talked about here are more indicative of what you might see from a diesel tune that is raising boost pressure. The 5.3 vortex is a quality engine with lots of potential, but you're not going to see 60 hp peak to peak from a tune alone.

samssun > IDROVEAPICKUPTRUCK
09/02/2014 at 22:01

No tune runs actual stoich (14.7:1), even a "lean" running engine is on the rich side for safety and because you can't perfectly distribute the fuel. A stock tune will typically be more on the safe/rich side, with room to lean it out and gain power, and you can also advance timing.

Premium would let you run more boost in a forced induction car, but shouldn't gain you anything on one that's NA, unless it's designed for it (higher compression) and the lower octane fuel causes it to pull timing. So the tune itself can't do much with the extra octane, but they want to make sure you aren't negating its benefits with lower octane that puts the engine in protection mode.

JGrabowMSt > Logansteno: Bought a VW?
09/02/2014 at 22:09

My friends stupid fast truck has 4:10 gears front and rear, 4 wheel drive, and is tuned to I think the 400 ballpark. Stupid fast, and worthless in the winter.

HammerheadFistpunch > Logansteno: Bought a VW?
09/02/2014 at 23:22

well you've learned what the manufacture claims in gains.

PetarVN, GLI Guy, now with stupid power > GhostZ
09/03/2014 at 00:21

....so what you are saying is that a clapped out (missing front bumper) 20 year old chevy muscle car with probably 140,000 miles on it, on shitty rubber can out corner my 2 year old VW on high performance Dunops, and 4 corner independent suspension?

...I don't think so

PetarVN, GLI Guy, now with stupid power > Logansteno: Bought a VW?
09/03/2014 at 00:22

...I meant that the car would stay upright at the end of the corner logan :P

Logansteno: Bought a VW? > PetarVN, GLI Guy, now with stupid power
09/03/2014 at 00:36

Don't worry, it does.

GhostZ > PetarVN, GLI Guy, now with stupid power
09/03/2014 at 00:41

I didn't say the worst Z28. I said the Z28.

Keeping everything constant, if it's maintained, clean, in its prime, and driven well, it probably has a much lower center of gravity, shorter wheelbase, harsher spring rates, not much weight difference (remove the spare from the trunk, and the Z28 is only about 50lbs heavier) and equivalent rubber (the Z28 has 245 section width vs the Jetta's 225) and it looks considerably closer. The Jetta might corner faster, but not by such a huge margin that I would bet on it.

PetarVN, GLI Guy, now with stupid power > GhostZ
09/03/2014 at 01:04

yeah, but we are comparing a car that has been well maintained to one that hasn't. A perfectly maintained Z28 might be quicker, but this one? no way in hell

PetarVN, GLI Guy, now with stupid power > Logansteno: Bought a VW?
09/03/2014 at 01:05

suuuure ;)

GhostZ > PetarVN, GLI Guy, now with stupid power
09/03/2014 at 01:22

I completely agree there. My post was meaning the cars on equal footing, though maybe it didn't come across that way.

PetarVN, GLI Guy, now with stupid power > GhostZ
09/03/2014 at 01:28

yeah, I just assumed you meant that particular one (which Is a death trap)
325hp is pretty serious, so it probably is faster, but i'll see what happens after GLI hits stage 1! :D