6.0L 5-Speed Dyno Day Today
#134
TECH Junkie
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Join Date: Apr 2006
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I don't see how your cam could die like the graph indicates. Something has to be up.
I freakin rev my STOCK CAM stock motor 5.3l to 6400rpms without feeling a power drop.
I also tested my shift point numorus times at the track to verify it was doin me good to rev it that high.
By stock motor i mean i have not touched the motor period it just has full bolt ons and 4.10 gears.run 13.7@99 spinning.
I freakin rev my STOCK CAM stock motor 5.3l to 6400rpms without feeling a power drop.
I also tested my shift point numorus times at the track to verify it was doin me good to rev it that high.
By stock motor i mean i have not touched the motor period it just has full bolt ons and 4.10 gears.run 13.7@99 spinning.
#136
TECH Veteran
I'm curious of a few things there. A stock LQ4 peaks around 5000-5200 with alot flatter torque curve. Your compression gain should certainly get you more torque. I'm kinda suspect that you were getting KR*. If you got KR* when you first went W.O.T. it would have faded away and got your torque up. It could have spiked again and lost you hp on the high end. I think the stock airbox is taking away some power. I think having an advance on a cam that small with your compression and cubes made it a bit more peaky. Getting an LQ4 to peak torque and hp that low with a cam is impressive though. Of course though we should have more info this week on mine for comparison. The LQ4 in the tahoe with unported 5.3L heads and a 224 cam should be together and running today or tomorrow. Dyno numbers soon.
#137
I'm curious of a few things there. A stock LQ4 peaks around 5000-5200 with alot flatter torque curve. Your compression gain should certainly get you more torque. I'm kinda suspect that you were getting KR*. If you got KR* when you first went W.O.T. it would have faded away and got your torque up. It could have spiked again and lost you hp on the high end. I think the stock airbox is taking away some power. I think having an advance on a cam that small with your compression and cubes made it a bit more peaky. Getting an LQ4 to peak torque and hp that low with a cam is impressive though. Of course though we should have more info this week on mine for comparison. The LQ4 in the tahoe with unported 5.3L heads and a 224 cam should be together and running today or tomorrow. Dyno numbers soon.
Speaking from experience building another motor a few years ago we had an olds 455 that ran like a scalded dog up top but didn't have tire melting power like you would expect from a big block olds. Long story short, after disassembly, we found that Engle ground the cam 6 degrees retarded. Put a new cam in it and holy schmoly it was a completely different beast.
At any rate, check back at the end of the day tomorrow as I should hopefully have some new numbers from somewhere else.
Zippy, get that thing of yours running and on the dyno, also post up some idle clips. I'll be getting another camshaft and trying again if this doesn't pan out the way I'd expect.
#139
12 Second Truck Club
iTrader: (13)
this guy has a little bigger cam then you and put down more hp but less tq. but everything i've read 350hp to the wheels is about right for a cammed lq4. thats what i hope i have.
https://www.performancetrucks.net/fo...d.php?t=414983
https://www.performancetrucks.net/fo...d.php?t=414983
#140
It's bothering me that everything fizzles out after 5400 RPM's or so. A cam my size should not fizzle out that quickly. I have to know for my own piece of mind if this is how it's supposed to run or if there's problems elsewhere. Every other 6L dyno I've seen carries well on past 6K even with similar or smaller cams. If something weird is going on, it needs to be resolved. If it's how it's supposed to be, well, then the cam isn't big enough for my needs. With the way my trans and rear end is geared, I like to do my shifting around 6-6200 RPM's. I've been doing that with my current combo but if the dyno is right, I'm losing speed by shifting that high.