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Old February 26th, 2013, 08:44 AM   #1481
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but when were done wheeling we can go get ice cream and talk about how much fun we had
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Old February 26th, 2013, 08:45 AM   #1482
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Think my fuel pump is good.I'll ask about the injectors Brandon.my buddy has some headers he wants me to run.but I kinda like my 2011 Camero manifolds. I want it to rumble now though.
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Old February 26th, 2013, 09:33 AM   #1483
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Think my fuel pump is good.I'll ask about the injectors Brandon.my buddy has some headers he wants me to run.but I kinda like my 2011 Camero manifolds. I want it to rumble now though.
If they're shorty headers don't bother. The stock manifolds flow plenty, you're not gonna notice a real difference unless you go long tubes.

Like Feva said, you definitely need bigger injectors to match those mods, and of course the tune to run it right.
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Old February 26th, 2013, 10:23 AM   #1484
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All I know is it should smoke your old rusted out bodied, square light crawler.


You keep talking smack and I just might ..........................




























I forgot what I was saying..................
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Old February 26th, 2013, 10:41 AM   #1485
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You keep talking smack and I just might ..........................







I forgot what I was saying..................

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Old February 26th, 2013, 10:53 AM   #1486
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Cam specs? Upgrade rod bolts and do the rocker trunion upgrade while it's out. I didn't and really wished I had.
I have read to run the stock rocker bearings as the aftermarket have had failures where the stock have not.

I bought a set of the upgraded trunions and now I question if I will sell them instead of install them in my LS3 with the cam I have waiting to be installed.

This is from professional engine builders not weekend wrenchers. I can post up the thread if you are interested in reading it.
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Old February 26th, 2013, 11:11 AM   #1487
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The guy I got the heads and short block from said use stock also. I'll send my computer back to b&d in Nevada.he will tune it for free for me since he already did it.he also gave me the can # and spring # from summit. Here is what I will have into it.
Short block.500.00
Heads.250.00
Cam and springs 550.00
Tune shipping...20 bucks
Gaskets , bearings. 150.00
All of my accesories will work from my 5.3.
So around 1500.00 I get a fresh motor and 200 HP.
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Old February 26th, 2013, 11:22 AM   #1488
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The guy I got the heads and short block from said use stock also. I'll send my computer back to b&d in Nevada.he will tune it for free for me since he already did it.he also gave me the can # and spring # from summit. Here is what I will have into it.
Short block.500.00
Heads.250.00
Cam and springs 550.00
Tune shipping...20 bucks
Gaskets , bearings. 150.00
All of my accesories will work from my 5.3.
So around 1500.00 I get a fresh motor and 200 HP.
I just threw up in my mouth a little. That's a little more than I have into loaded cylinder heads.
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Old February 26th, 2013, 12:21 PM   #1489
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I just threw up in my mouth a little. That's a little more than I have into loaded cylinder heads.
So what r u saying Brandon.???
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Old February 26th, 2013, 12:55 PM   #1490
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You're price is good, aka I paid too much
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Old February 26th, 2013, 01:48 PM   #1491
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Watching close till I see it run.
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Old February 28th, 2013, 11:26 AM   #1492
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everyone says i dont need to change the injectors. hope to have this going in 2 weeks.
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Old February 28th, 2013, 11:44 AM   #1493
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"Everyone" is wrong, change the injectors.
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Old February 28th, 2013, 12:02 PM   #1494
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what makes you think that brandon? rocksolid has done a bunch of these they said injectors are fine.my tuner said at the best tune he could do they are right at the max.but they work. do you think changing them will give me more power? i want to do this right so i value any opinion anyone can give me.
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Old February 28th, 2013, 12:02 PM   #1495
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Typically you scan and see what duty cycle your injectors are at. Rule of thumb is to try and stay under 80%. At 100% they go static and stay open, no bueno if one sticks there.

Injector size = (HP x BSFC) / (number in injectors x duty cycle)
Horsepower limit = (Injector size x number of cylinders x duty cycle) / BSFC)
BSFC~.45-.5 from what I've found online.

HP=(25.2*8*.8)/(.5)=326.4HP@80% duty cycle

If you assume a .45 BSFC (more efficient engine)
HP=(25.2*8*.8)/(.45)=358.4HP@80% duty cycle


Copied from How to identify vortec truck engine
"
Fuel injector flow rate is very important to have programmed correctly in your PCM. Find a small 8 digit number located on side of each fuel injector. Here is the breakdown.

25317669, 25320287 - 1999, 4.8L and 5.3L - flows 2.742 gm/sec or 21.8 lb/hr @ 58 psi

25317670, 25320288, 25323974 - 1999-2000 6.0L, 2000 4.8L and 5.3L - flows 3.125 gm/sec or 24.8lb/hr @ 58 psi

25317628 2001-2007 - 4.8L, 5.3L, 6.0L - flows 3.180 gm/sec or 25.2lb/hr @ 58 psi

25326903 - 5.3L L59 Vin Z, flex fuel 5.3L - flows 4.164 gm/sec or 33lb/hr @ 50 psi

12554271 - 1997-1998 5.7L LS1 - flows 3.727 gm/sec or 29.6lb/hr @ 58 psi

12555894 - 1999-2000 5.7L LS1 - flows 3.438 gm/sec or 27.3lb/hr @ 58 psi

12561462 - 2001-2004 5.7L LS1, LS6 - flows 3.781 gm/sec or 30lb/hr @ 58 psi"
Billavista's LQ4 page
Vortec 6000 6.0L V-8 LQ4 Tech Article by BillaVista - Pirate4x4x.com
I'm using 74% of a 41lb/hr LS3 injector and I'm not optimized yet. That's 30.34 lb/hr @100 duty cycle. You're going to be at a higher compression(lq9 vs lq4) so assuming they get your cam right, you'll need more fuel to maintain AFR than I am using, which no stock truck injector is going to give you while maintaining the 80% rule. You need bigger injectors if you're going to run the stock 58psi fuel pressure. "Everyone" is wrong in this instance.
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Old February 28th, 2013, 01:03 PM   #1496
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The guy I got the heads and short block from said use stock also. I'll send my computer back to b&d in Nevada.he will tune it for free for me since he already did it.he also gave me the can # and spring # from summit. Here is what I will have into it.
Short block.500.00
Heads.250.00
Cam and springs 550.00
Tune shipping...20 bucks
Gaskets , bearings. 150.00
All of my accesories will work from my 5.3.
So around 1500.00 I get a fresh motor and 200 HP.
Make sure you follow up on the little stuff like making sure the new short block will work with your computer. I'm sure your engine guy knows all the details, but make sure the communication is open so you don't end up having an awesome engine that won't work with your computer.

I remember another budget swap that ended up going way over budget on the little bullshit.
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Old February 28th, 2013, 01:58 PM   #1497
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Erin, here's a scan from when I was testing in Aug.
You'll see Mass Air flow(lbs of air) at 52.929lb/min. Multiply by 60 to get 3175lbs/hr. Divide that by 8 cylinders(injectors) to get 396.97 lbs/cylinder(lb/injector). Then divide that by the air/fuel ratio of 12.3 that my wideband was reading to get 32.3 lb/hr. That's the amount of lb/hr of gas needed to make a 12.3 air/fuel ratio at that rpm. So at 100% duty cycle for the injector, you would need a 32.3 lb/hr injector. If you divide that number by .8, you get the size injector needed to run at 80% duty cycle, which is 40 lb/hr. This is why I put LS3 injectors at 41lb/hr rating in. My engine is almost identical to yours except you'll have more compression with flat top pistons making more power if tuned right.

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Old February 28th, 2013, 02:25 PM   #1498
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You crossed the streams.
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Old February 28th, 2013, 02:31 PM   #1499
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what cam duration and loab did you do brandon. i have a couple different suggestions on this.not sure what one i want. the ls6 cam is real mild and i have been told to bump it up a little more if im doing this. yellow springs or orange? did you do the l92 heads? you stay with the truck intake or did you do the car? i am leaning towards the car just because i can drop the engine gaurd more and give me a bunch more visibility in my buggy. they claimed a 10% loss in tourque with the car intake.
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Old February 28th, 2013, 02:34 PM   #1500
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the guy im getting the block and heads from, has any intake i want.so i have to decide soon since its all getting picked up the first of the week.
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