what gear to dyno in ???
12-18-2004, 01:46 PM
#33
Originally Posted by Naked AV
I'm with you. I had no idea the dyno operator was going to run my truck in 3rd, and ignorant as I was, I assumed it would be 2nd. There were people standing 12-15 ft from my truck when the driveshaft came apart at 141 mph, and half of the shaft flew out and came to rest about 2 feet from one of the bystanders. I felt thumps under the floorboards when it split in half, before it separated from the front U-joint. Pretty scary ****. We were all very fortunate that no one was hurt.
That incident changed how I look at speed and also how I look at professionals who are supposed to know what they're doing. Going forward, I will not trust anyone to do my thinking for me. From now on I will be doing all of my own research, like I should have been doing in the first place, like I already do in other areas like law (lawyers) and medicine (doctors).
As far as dynoing my vehicle, any future runs will be done in second gear. I pretty much have to with a 5" x 72" aluminum driveshaft and its associated critical speed. I don't care if it shows less power. I will also be standing very far away and/or behind something from for my vehicle's and all other's dyno runs. All it would take would be some manufacturing defect in the rear end or a nail in a tire to show itself at 125 or 130 mph, and someone loses a limb, an eye, or their life.
My $.02.
That incident changed how I look at speed and also how I look at professionals who are supposed to know what they're doing. Going forward, I will not trust anyone to do my thinking for me. From now on I will be doing all of my own research, like I should have been doing in the first place, like I already do in other areas like law (lawyers) and medicine (doctors).
As far as dynoing my vehicle, any future runs will be done in second gear. I pretty much have to with a 5" x 72" aluminum driveshaft and its associated critical speed. I don't care if it shows less power. I will also be standing very far away and/or behind something from for my vehicle's and all other's dyno runs. All it would take would be some manufacturing defect in the rear end or a nail in a tire to show itself at 125 or 130 mph, and someone loses a limb, an eye, or their life.
My $.02.
12-18-2004, 04:01 PM
#34
TECH Veteran
Originally Posted by BlownChevy
Ahh the dyno argument....I have not seen this one in a while 
12-19-2004, 01:26 PM
#35
Collecting data is tuff around here, sheesh. Finally found a deserted FLAT street to make some Gtech runs on.
1/4 mile ET 15.7 @ 90.9mph
60ft 2.3
0-60 8.1
1/8 mile ET 10.2 @ 71.3mph
245 hp @ 5166rpm
260 tq @ 3825rpm
for those that have studied ET/HP, how does this sound?
1/4 mile ET 15.7 @ 90.9mph
60ft 2.3
0-60 8.1
1/8 mile ET 10.2 @ 71.3mph
245 hp @ 5166rpm
260 tq @ 3825rpm
for those that have studied ET/HP, how does this sound?
12-19-2004, 02:21 PM
#36
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FWIW here is what I got for mine with the Superchips 2280 but with the Air Force One Intake removed.
1/4 mile ET 16.19 @ 89.5 mph
60 Ft 2.63
0-60 8.7
1/8 mile ET 10.6 @ 70.4 mph
234 HP @ 4624 rpm
278 TQ @ 4052 rpm
My truck weighs 6050 lbs with me in it but I cannot remember how much gas. The run was done in 4HI and I think the HP and TQ figures are from 2nd gear because the trans always shift down on me if I try to do a 3rd gear pull.
These figures are an average of 4 runs taken on May 4, 2004 at 12*C ( 54* F) at about 100 Ft above sea level.
1/4 mile ET 16.19 @ 89.5 mph
60 Ft 2.63
0-60 8.7
1/8 mile ET 10.6 @ 70.4 mph
234 HP @ 4624 rpm
278 TQ @ 4052 rpm
My truck weighs 6050 lbs with me in it but I cannot remember how much gas. The run was done in 4HI and I think the HP and TQ figures are from 2nd gear because the trans always shift down on me if I try to do a 3rd gear pull.
These figures are an average of 4 runs taken on May 4, 2004 at 12*C ( 54* F) at about 100 Ft above sea level.
12-19-2004, 04:03 PM
#37
Originally Posted by Mort
FWIW here is what I got for mine with the Superchips 2280 but with the Air Force One Intake removed.
1/4 mile ET 16.19 @ 89.5 mph
60 Ft 2.63
0-60 8.7
1/8 mile ET 10.6 @ 70.4 mph
234 HP @ 4624 rpm
278 TQ @ 4052 rpm
My truck weighs 6050 lbs with me in it but I cannot remember how much gas. The run was done in 4HI and I think the HP and TQ figures are from 2nd gear because the trans always shift down on me if I try to do a 3rd gear pull.
These figures are an average of 4 runs taken on May 4, 2004 at 12*C ( 54* F) at about 100 Ft above sea level.
1/4 mile ET 16.19 @ 89.5 mph
60 Ft 2.63
0-60 8.7
1/8 mile ET 10.6 @ 70.4 mph
234 HP @ 4624 rpm
278 TQ @ 4052 rpm
My truck weighs 6050 lbs with me in it but I cannot remember how much gas. The run was done in 4HI and I think the HP and TQ figures are from 2nd gear because the trans always shift down on me if I try to do a 3rd gear pull.
These figures are an average of 4 runs taken on May 4, 2004 at 12*C ( 54* F) at about 100 Ft above sea level.
12-19-2004, 07:48 PM
#39
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I sort of brake stall as well. I put my foot on the brake and floor it and when the revs go over 2200 or so I let up on the brake. I get both rear tires spinning for about 10 feet then they hook up. I never measured it so 10 ft is just a guess. Sometime I will just hold it and see where it stalls. 
Later
I never measured it so 10 ft is just a guess. Sometime I will just hold it and see where it stalls. Later
12-19-2004, 07:54 PM
#40
TECH Fanatic
Originally Posted by moregrip
Collecting data is tuff around here, sheesh. Finally found a deserted FLAT street to make some Gtech runs on.
1/4 mile ET 15.7 @ 90.9mph
60ft 2.3
0-60 8.1
1/8 mile ET 10.2 @ 71.3mph
245 hp @ 5166rpm
260 tq @ 3825rpm
for those that have studied ET/HP, how does this sound?
1/4 mile ET 15.7 @ 90.9mph
60ft 2.3
0-60 8.1
1/8 mile ET 10.2 @ 71.3mph
245 hp @ 5166rpm
260 tq @ 3825rpm
for those that have studied ET/HP, how does this sound?