White90GT
02-21-2005, 10:17 AM
Already put the info in another post, but thought I'd put it here since this is where it goes.
At the braggin rights national event this Saturday, I used the several hours of test and tune time to play with my n/a tune a little and try for a new best.
Previous best on this motor with the current converter (before I got it re-stalled) was an 11.41@115.29 mph with a 1.54 sixty foot. The converter was way loose stalling to around 5200 rpm and didn't give me a lot of top end speed (hence an 11.4x at only 115mph), so I had it tightened up to around 3800 (or I had hoped). It wound up feeling tighter than that and more like my old 3200 rpm converter felt. I had taken it to HMP with the re-stalled converter about a month ago and managed another 7.27@93.5mph with a 1.59 sixty foot which was right on with the 11.41 pass' 1/8 mile time.
Anyways, on to Saturday:
Got there and made a pass and was shocked with a measly 1.64 sixty foot and 11.6x@116.x mph pass. Tried raising the timing to 20* base + advance up to around 44 * with no luck, time just got worse with a weaker launch. I tried doing a few things with the timing including pulling the spout and running a flat 36* of timing still with no luck and down to a 1.70 sixty foot at this point. So Brian Warwas suggested adding fuel pressure. I looked and had leaned it out a bunch on a previous outing with only around 33 psi of pressure. I kicked it up to 40 psi and was rewarded with a 1.60 sixty foot and 11.45@117.x mph. I raised another 2 psi to 42 and was rewarded with a slightly spinning 1.59 sixty foot and 11.31@118.9mph pass! Hot lapped to back it up with an 11.35@118.2mph pass. Was running short on time and needed to get a couple nitrous passes in, so I strapped in the bottle and ran a 10.91@120mph hitting the rev limiter around the 1000 ft mark. Time to up the limiter a little. I am a little upset that the converter now feels so tight on the bottom for launching, but still seems loose up top causing me to be on the rev limiter at such a low mph. Any ideas why that is? Its a trans king 8" converter. Are 8" converters just not that efficient in the top gear? Sixty foots on the nitrous were in the 1.51-1.52 range all day hooking solid and all the 1/8 mile times were in the 6.9x@99 range. I was running 15* of base timing on the 75 shot with a mix of 93/104 gas.
At the braggin rights national event this Saturday, I used the several hours of test and tune time to play with my n/a tune a little and try for a new best.
Previous best on this motor with the current converter (before I got it re-stalled) was an 11.41@115.29 mph with a 1.54 sixty foot. The converter was way loose stalling to around 5200 rpm and didn't give me a lot of top end speed (hence an 11.4x at only 115mph), so I had it tightened up to around 3800 (or I had hoped). It wound up feeling tighter than that and more like my old 3200 rpm converter felt. I had taken it to HMP with the re-stalled converter about a month ago and managed another 7.27@93.5mph with a 1.59 sixty foot which was right on with the 11.41 pass' 1/8 mile time.
Anyways, on to Saturday:
Got there and made a pass and was shocked with a measly 1.64 sixty foot and 11.6x@116.x mph pass. Tried raising the timing to 20* base + advance up to around 44 * with no luck, time just got worse with a weaker launch. I tried doing a few things with the timing including pulling the spout and running a flat 36* of timing still with no luck and down to a 1.70 sixty foot at this point. So Brian Warwas suggested adding fuel pressure. I looked and had leaned it out a bunch on a previous outing with only around 33 psi of pressure. I kicked it up to 40 psi and was rewarded with a 1.60 sixty foot and 11.45@117.x mph. I raised another 2 psi to 42 and was rewarded with a slightly spinning 1.59 sixty foot and 11.31@118.9mph pass! Hot lapped to back it up with an 11.35@118.2mph pass. Was running short on time and needed to get a couple nitrous passes in, so I strapped in the bottle and ran a 10.91@120mph hitting the rev limiter around the 1000 ft mark. Time to up the limiter a little. I am a little upset that the converter now feels so tight on the bottom for launching, but still seems loose up top causing me to be on the rev limiter at such a low mph. Any ideas why that is? Its a trans king 8" converter. Are 8" converters just not that efficient in the top gear? Sixty foots on the nitrous were in the 1.51-1.52 range all day hooking solid and all the 1/8 mile times were in the 6.9x@99 range. I was running 15* of base timing on the 75 shot with a mix of 93/104 gas.