Spring Split - Why? and Low Dynojet rwhp/rwtq
Thread Starter
7th Gear
Joined: Jan 2001
Posts: 7
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From: College Station Tx
Spring Split - Why? and Low Dynojet rwhp/rwtq
While replacing the rear end (3.45's for 2.59's) noticed that the stock spring was split on the drivers side and delaminating. I ran the car at the strip a few times but have not heard of others having this problem. The car ('93) has 40,000 miles on it. Purchased pictures of the car launching and it appears to "squat" (weight transfer) quite a lot with the broken spring. Any ideas why this happened or how to prevent it from happening again?
Suspect the Dynojet was malfuncting because rwhp = 220 and rwtq = 260. With the following drag times is this possible?
Thanks,
Rubysdo
'93 Automatic, 2.59's, 13.51 sec., 1.95 sec 60 ft., 101 mph
Suspect the Dynojet was malfuncting because rwhp = 220 and rwtq = 260. With the following drag times is this possible?
Thanks,
Rubysdo
'93 Automatic, 2.59's, 13.51 sec., 1.95 sec 60 ft., 101 mph
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Spring Split - Why? and Low Dynojet rwhp/rwtq (rubysdo)
Auto's typically dyno less than a manual, but that does seem a little low. Does your printout say SAE Horspower or STD, or some other correction scheme?
That can make a difference.
That can make a difference.
Thread Starter
7th Gear
Joined: Jan 2001
Posts: 7
Likes: 0
From: College Station Tx
Re: Spring Split - Why? and Low Dynojet rwhp/rwtq (Nathan Plemons)
SAE hp and tq on a Dynojet using WinPEP program. It took the hung over operator six Dynoruns to get two graphs (print out was not working). Graphs started at 4000 rpm and went to 5,800 rpm. It was a Hot morning in Houston, Tx, over 90 degrees F, but I thought the WinPEP program corrected for temp., pressure, etc. The operator was constantly messing with the computer and air compressor feeding the dyno. Is there a formula using vehicle weight/gears/times/speed to convert to HP and TQ?
Thanks,
Thanks,
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Spring Split - Why? and Low Dynojet rwhp/rwtq (rubysdo)
It's very hard to get an auto to dyno properly because they keep wanting to shift gears. All of my dyno pulls I run from like 2000 rpm's up. It does automatically correct for temp and such, but there are different correction schemes.
You can print the graphs in several ways, SAE, STD, EEC, etc. SAE is by far the most common and best for comparing with other people. You can also view them uncorrected which is interesting to look at sometimes. For instance I made 372 uncorrected.
You can print the graphs in several ways, SAE, STD, EEC, etc. SAE is by far the most common and best for comparing with other people. You can also view them uncorrected which is interesting to look at sometimes. For instance I made 372 uncorrected.
