5.3, radix, 4l80
07-31-2004, 12:54 PM
#11
that ET seems ok to me looking at your mods. picking up .7 with your recent mods but slowing down with the 80 seems great to me.
gears and headers and you will see some 12's. then on a cool day maybe a mid 12. weather is huge for boosted set ups.
gears and headers and you will see some 12's. then on a cool day maybe a mid 12. weather is huge for boosted set ups.
07-31-2004, 01:02 PM
#12
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I think the headers would be firs ton my list compared to the cam. Alone, they will probably equate to about the same, but together, they will run even better. I think Parish might be a little optimistic, but pretty close.
07-31-2004, 01:04 PM
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Originally Posted by whitt1
The 4L80E has a taller first and second gear,your gearing is about the same as a 4L60E with 3.08 gears in first and second gears.The 4.10s will give a good compromise for overall performance,as it would take a 4.56 rearend ratio to give equal gearing in first to your 3.73/4L60E setup.Remember also that the 4L80E has a shorter fourth .75 as compaired to the 4L60E's .70,so a 4.56 rear gear might not be what you want.The best part of the 4L80E gearing is that the ratios are more closely spaced,so you don't have the huge drop on the second to third shift.The 3MPH increase in trap speed represents the horsepower increase you gained with the new pulley the rest is due to the change in converters and slicks.My Radix setup with headers in a much heavier Tahoe with longtube headers can turn over 102mph representing a big increase in horsepower attributed to the freeier flowing exhaust,with the headers you will also show about a pound less boost,do to the lessened restriction to the exhaust ports.
Thanks for the numbers. I new the gearing was different but hadn't taken the time to figure out how much. 4.10's might be in the future but I've already killed my gas mileage and am not sure how much worse I want to make it.
As far as my trap speed go's my fastest last night was 103mph but it did come with my fastest et. This dumb founds me because you would think if you get off the line better then you get up to speed faster then you would have a higher mph. I ran into this same thing before my recent mods. I was running 99mph but the et's were around 14.3. I see alot of people say the same thing on here so I guess it's just how it is.
07-31-2004, 01:19 PM
#14
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Next question. Has anyone hit a radix blown 5.3 with a good shot. I have thought a lot about this. And was what I had planed before I blew up the 4l60. I wanted to get ls1 edit and start teaching myself then slowly work it some juice in but the 60 went so quick that there was no time and I wanted my truck done so I went with nelson. I still plan on some n20 but that's way down the road know. And I'm sure by then you guys will have it all figured out.
07-31-2004, 01:24 PM
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Originally Posted by parish8
that ET seems ok to me looking at your mods. picking up .7 with your recent mods but slowing down with the 80 seems great to me.
gears and headers and you will see some 12's. then on a cool day maybe a mid 12. weather is huge for boosted set ups.
gears and headers and you will see some 12's. then on a cool day maybe a mid 12. weather is huge for boosted set ups.
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