Cam only A4 Dyno w/questions
02-07-2005, 01:10 PM
#22
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http://www.gordon-glasgow.org/hpcalc.html You use this calculator and then subtract 18% of the calculated HP, by doing this it seem to reflect the Dyno jet numbers very closely. Give it a try and see what you think.
02-08-2005, 09:33 AM
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Another thing I have noticed is that a lot the cars especially with the bigger cams tend to pick up an additional 15-25 hp after tuning. Do you think that is an issue? Guess you did not think much of my hp calculations. Do you not think they reflect the dyno numbers?
02-08-2005, 11:15 AM
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Originally Posted by Zippinzee
Another thing I have noticed is that a lot the cars especially with the bigger cams tend to pick up an additional 15-25 hp after tuning. Do you think that is an issue? Guess you did not think much of my hp calculations. Do you not think they reflect the dyno numbers?
With a 114+2 Lsa it would peak in the higher rpm range.
02-08-2005, 11:21 AM
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Originally Posted by Zippinzee
http://www.gordon-glasgow.org/hpcalc.html You use this calculator and then subtract 18% of the calculated HP, by doing this it seem to reflect the Dyno jet numbers very closely. Give it a try and see what you think.
Would it be better to use the corrected (0') et and mph #'s to get a more accurate hp #?
Corrected #'s are: 11.18@119.87
If I use the corrected #'s I get 479.3rwhp -18% = 393
02-08-2005, 11:30 AM
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Originally Posted by Zippinzee
I guess what i am trying to say is mathmaticly the formula seems to inflate the numbers that come from the dyno on a locked converter car about 18% which when you subtract that from the 483 camed and 438 no cam you end up with 396 camed 359 no cam which is getting close to what your car should show on a Dyno with a locked converter. And at that point the cam is only showing a 37 rwhp increase. When a converter is ineffecient it may 60' well but the mph usually will suffer your mph seems good for the weight of the car and amount of power available. If it were me I would lean more to the cam than converter.
So your saying that my converter is robbing me of around 50 hp unlocked vs locked???
02-08-2005, 02:24 PM
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I am not sure if the corrected numbers would make too much difference. No I am not saying that you are looseing that much, what I am saying is I believe there is a problem with a dyno giving accurate numbers without the clutch being locked. It looks to me like it would be hard to tune it on the dyno with a unlocked converter. For some reason the dyno has a hard time fully loading the auto cars with the converter unlocked hence the low hp numbers which in turn makes me ask the question how do you tune the car when it is not under a full load. I think your car ran very good before the cam, but I do not believe it has reached its full potential with the cam, that is why I do not think it is the converter, but time will tell when you get the yank in it. I have seen you at the track and you know a friend of mine, he has a pewter formula with exhaust manifolds and cats on it, his name is Ross, and his car has run a 7.64.
02-08-2005, 03:03 PM
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I have the Silver WS6 Formula. It has done a best of 7.90 86 mph it is stock except for Holley filter, converter and M/t drag radials. You are doing the right thing, you are asking questions and making changes and that is what it is going to take to meet your goals. I am not claiming to be an expert but I have been drag racing cars all my life and am a research addict, so hopefully I have helped.
Now we will see what happens when the Yank goes in and if it doesn't help it's time to look at the cam.
02-09-2005, 08:23 AM
#32
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Bain
If you get a chance look at my cam only thread as there is at least one guy that posted the information I was looking for. He went from 360 full bolt on to 415 with cam which is 55 at the rear wheels.
If you get a chance look at my cam only thread as there is at least one guy that posted the information I was looking for. He went from 360 full bolt on to 415 with cam which is 55 at the rear wheels.
