5.3L @ 26psi?

[Thirdgen89GTA]

Has anyone read this article HotRod did? Impressive.

http://www.hotrod.com/techarticles/hrdp_1109_stock_gm_ls_engine_big_bang_theory/

Click to read more...

 

[Bob Kazamakis]

Welcome to 4 months ago

 

[Eagle]

DICK! ^^^^

26psi is nuts!

 

[Thirdgen89GTA]

I don't subscribe to hot-rod.

 

[Thirdgen89GTA]

And I suppose I should have finished the article, because it turns out it was a 4.8L

But think about it. Whats the maximum safe level of boost most people say you can run, pretty much in the 5-7psi area on pump gas for a normal SBC. This is 26psi.

So the question is if you run a water/meth kid how far can you go with a 5.3L on pump gas with the right tune? Crazy.

not used to seeing those numbers except on Supra's and such.

 

[Dasfinc]

In defense of the numbers, this was on an Engine Dyno, so Whp would have been far FAR lower.

Seeing it hold this kind of pressure is pretty spectacular though.

 

[Thirdgen89GTA]

I wonder how long it would truly last though. I'm sure its not going to hold together for 10s of thousands of miles then.

But then again since i only drive my GTA once every couple of weeks guess that doesn't mean much. I'd probably drive it alot more if it had a manual, or the A4 wasn't missing OD and TCC lockup (PCM/trans mis-match from the swap).

 

[Bru]

In defense of the numbers, this was on an Engine Dyno, so Whp would have been far FAR lower.

Even considering a 25% drivetrain loss they're still making 900-ish hp to the wheels.

 

[Dasfinc]

Even considering a 25% drivetrain loss they're still making 900-ish hp to the wheels.

I agree, but I'm sure the strain on the motor would be far more as well (so 900hp but the actual strain on the engine since its spinning the transmission/transaxle/wheels would shorten its life too I'm sure)

I just like playing devils advocate.

Again, 900whp is not exactly fucking around on an essentially stock block/internals.

 

[Bru]

Engine dynos take measurements by placing loads on the engine.

 

[Dasfinc]

Engine dynos take measurements by placing loads on the engine.

I didn't really know how Engine dynos work Vs. wheel dynos, should have guessed as much.

 

[Bru]

Either way, they estimated at those power levels the block would be good for one season racing. They put 60+ dyno runs on it at 1,000+ hp.

 

[Handsome Jesus]

Bru - 1

 

[firemandan1700]

Either way, they estimated at those power levels the block would be good for one season racing. They put 60+ dyno runs on it at 1,000+ hp.

Bingo! And if your not a constant track go-er like myself, that motor might last a few years then...

Now I didnt re-read the article but didnt this motor have some high miles on the block?

 

[79vette]

its all in the tune,you could have the same set up pop at 7 psi if the tune is not right.

 

[Pressure Ratio]

A guy I know has a junk yard LS motor that has a 76mm on it. It has been 9.2x @150 so far. On 16# of boost. unreal what a stock motor and some boost can do. haha

 

[Soulonfire11]

Thats nuts! I know the LS motors are stout but ive always heard the stock rod bolts are the weak link in forced induction setups.

Tuning is key.

 

[OffshoreDrilling]

http://www.yellowbullet.com/forum/showthread.php?t=417721

8.63 @164mph on a 170k mile 5.3 with a turbo

 

[KAR]

ooooo does that give me ideas...... now i just need more money. How cheap do you guys think one can put a junkyard boosted motor together for? 5k?

 

[C.Evans]

Wow, all that power out of a 4.8! Imagine fat tony's 4.8 powered s10 with this setup. Ranger killer.

Sent from my DROIDX using Tapatalk

 

[Smokinhot]

I had a 4.8 in my truck but opted for the 6.0 for torque reasons. Imagine 26psi on a 6.0 :naughty:

And I'm already close to being a ranger killer

 

[C.Evans]

I had a 4.8 in my truck but opted for the 6.0 for torque reasons. Imagine 26psi on a 6.0 :naughty:

And I'm already close to being a ranger killer

Keyword: "close"... but no cigar.

Sent from my DROIDX using Tapatalk

 

[hellraiser319]

Using a calculator I found on google... 26.2:1 compression ratio... slightly more than the average diesel.. wow.

 

[Smokinhot]

Keyword: "close"... but no cigar.

you guys sure are witty lol.

I love your truck though

 

[RossiGTP]

Have a 5.3 sitting in my storage unit waiting to be sent down to a machinist.