Quote:
Originally Posted by hackster
Was at 8lbs on stock setup, pump gas, no meth, just normal boosted pump gas engine. Tune is very conservative. Keep in mind that this is a 6.0 Gen IV truck motor, its not an LSA block, heads or accessory drive. I wish =)
From what I have read and researched....
The LSA crank pulley is 7.8" and the stock truck crank pulley I am running is a 7.5" so that means I have an underdriven crank pulley. I should be overdriving the blower by approx 20% with a max speed of under 20,000 rpm with the 7.5" crank and 2.45" upper. I also cannot fit a larger pulley in there with the Nick Williams Throttle body.
https://www.lingenfelter.com/PRI2014...heet%201.1.pdf
The other thing to note, I dont spin this thing to the moon. I have my rev limiter set to 6200 currently and usually shifted about 5600 to 6000.
I am going for smooth, reliable horsepower on this setup so the tune will take that into account.
The one thing I am worried about is the brick and wonder if I should install a reinforced one while I have everything apart.
Appreciate all of the pointers though, sure helps having others keep an eye on it. I also don't think Ill be anywhere near your 702 wheel hp.
Sean |
Ah, that smaller lower pulley makes a big difference in total blower speed!
The reinforced brick is cheap to outsource (~$100), and even cheaper to do yourself (~$30 for a kit). That being said, it's boost that kills the brick and 8-10lbs should be okay. If it does deform, it typically just dents inward without leaking, and hampers cooling. IE your IAT2s will creep up as the coolant flow is impacted, but there aren't a lot of reports of catastrophic brick failures AFAIK.
I'm running 16lbs of boost with a stock LSA longblock and a 2.4" upper, and my brick is still fine. That being said, I only street drive the car and never see 4th and 5th gear pulls that you'll see on a road course.
Have you looked at flex fuel? I pick up ~100rwhp at ~E50 over 91 octane.
In fact, you could potentially run 91/93 octane for autoX and speed stop, then ethanol for road course and probably be faster at both events based on fuel alone.
Also, do you have AC installed on the car? If so, using an interchiller to cool your blower coolant in the staging lanes will give you a lot more predictable power versus a heatsoaked blower by the time you get to the starting line, and unknown timing pulled during the run as your IAT2s creep up.