Cam only A4 Dyno w/questions
Thread Starter
Joined: Jan 2003
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From: Fort Worth, TX
Cam only A4 Dyno w/questions Does this graph indicate an inefficient converter? or is the cam just not making the power?
Red=Cam 242/248 .605/.615 114+2 lsa
Blue=Cam
Green=Stock Internal.
http://img.photobucket.com/albums/v4...0Car/na006.jpg
Several people have said the HP should have a peak in there, but pretty much makes the same power throughout the RPM range. I'm trying to figure out if it is an ineffivient converter issue or a cam issue. When it was SI with the 3800 it kept pulling to the peak hp. Then I switched to the 4400 and it lost 20hp and the graph flatlined all the way across and started to dip down at the end (see green graph). Now it looks like the cam graph is doing the same thing. It looks like to me it gets to a certain rpm and doesn't make any more power kinda like the converter bleeds the power off
Please tell me what you guys think. Any help would be greatliy Appreciated.
Thanks,
Richard
Red=Cam 242/248 .605/.615 114+2 lsa
Blue=Cam
Green=Stock Internal.
http://img.photobucket.com/albums/v4...0Car/na006.jpg
Several people have said the HP should have a peak in there, but pretty much makes the same power throughout the RPM range. I'm trying to figure out if it is an ineffivient converter issue or a cam issue. When it was SI with the 3800 it kept pulling to the peak hp. Then I switched to the 4400 and it lost 20hp and the graph flatlined all the way across and started to dip down at the end (see green graph). Now it looks like the cam graph is doing the same thing. It looks like to me it gets to a certain rpm and doesn't make any more power kinda like the converter bleeds the power off
Please tell me what you guys think. Any help would be greatliy Appreciated.Thanks,
Richard
Last edited by BAIN; Feb 3, 2005 at 10:57 AM.
Thread Starter
Joined: Jan 2003
Posts: 1,455
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From: Fort Worth, TX
Originally Posted by Black02SS
If you could get the graph to go from 3k up and only scale it in 500rpm incriments, that might help a little trying to figure it out.
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Originally Posted by BAIN
Does this graph indicate an inefficient converter? or is the cam just not making the power?
Red=Cam 242/248 .605/.615 114+2 lsa
Blue=Cam
Green=Stock Internal.
http://img.photobucket.com/albums/v4...0Car/na006.jpg
Several people have said the HP should have a peak in there, but pretty much makes the same power throughout the RPM range. I'm trying to figure out if it is an ineffivient converter issue or a cam issue. When it was SI with the 3800 it kept pulling to the peak hp. Then I switched to the 4400 and it lost 20hp and the graph flatlined all the way across and started to dip down at the end (see green graph). Now it looks like the cam graph is doing the same thing. It looks like to me it gets to a certain rpm and doesn't make any more power kinda like the converter bleeds the power off Please tell me what you guys think. Any help would be greatliy Appreciated.
Thanks,
Richard
Red=Cam 242/248 .605/.615 114+2 lsa
Blue=Cam
Green=Stock Internal.
http://img.photobucket.com/albums/v4...0Car/na006.jpg
Several people have said the HP should have a peak in there, but pretty much makes the same power throughout the RPM range. I'm trying to figure out if it is an ineffivient converter issue or a cam issue. When it was SI with the 3800 it kept pulling to the peak hp. Then I switched to the 4400 and it lost 20hp and the graph flatlined all the way across and started to dip down at the end (see green graph). Now it looks like the cam graph is doing the same thing. It looks like to me it gets to a certain rpm and doesn't make any more power kinda like the converter bleeds the power off
Please tell me what you guys think. Any help would be greatliy Appreciated.Thanks,
Richard
Thread Starter
Joined: Jan 2003
Posts: 1,455
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From: Fort Worth, TX
Originally Posted by BADFNZ
Bain, my PT4000 graph looks identical. If you remember when Lane was SI, his PT4200 graph was the same too. It's something about the converter that doesn't let it peak for some reason. I'm not sure if you have a Yank or not but most PT series graphs I've seen do the same exact thing.
Actually I have a TCI 4400. Hmmm. Send me your dyno
Originally Posted by BAIN
Actually I have a TCI 4400. Hmmm. Send me your dyno
Blue-PT4000
No other changes done to car. Shows how efficient the Midwest was but the Yank performs 10x better at the track.
Launching!
Joined: Nov 2003
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Since the dyno does not show you much with a unlocked converter I figured the rwhp with the formula that uses e/t, mph and weight and it shows 483 rwhp with a 3400 lb car. Before the cam it figures 438 so the cam made 45 rwhp. Your mph seems good comparing it to simular cars and the 60' seems good especially at your weight. Is the cam a little down on power?
Thread Starter
Joined: Jan 2003
Posts: 1,455
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From: Fort Worth, TX
Originally Posted by Zippinzee
Since the dyno does not show you much with a unlocked converter I figured the rwhp with the formula that uses e/t, mph and weight and it shows 483 rwhp with a 3400 lb car. Before the cam it figures 438 so the cam made 45 rwhp. Your mph seems good comparing it to simular cars and the 60' seems good especially at your weight. Is the cam a little down on power?
Originally Posted by BAIN
They way it looks others times v/s power I'm going to need 380-400 rwhp to get into the 10's. I'm just trying to figure out if the converter is taking too much power or maybe the cam just isn't going to get me in that power range.
Thread Starter
Joined: Jan 2003
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From: Fort Worth, TX
Originally Posted by ty_ty13
what chassis mods do you have and what tires and rims do you have to get that kind of 60 time.... what other motor mods do you have?
I run 26x10x15 ET Drags now. And put a cam in
Last edited by BAIN; Feb 7, 2005 at 11:02 AM.
Launching!
Joined: Nov 2003
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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.
Thread Starter
Joined: Jan 2003
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From: Fort Worth, TX
Thanks for the suggestion. 
I just bought a Yank PT 4400 and when it gets here I will see if it makes a difference in rwhp and track times. If it doesn't I will be trying a different cam 
I just bought a Yank PT 4400 and when it gets here I will see if it makes a difference in rwhp and track times. If it doesn't I will be trying a different cam Launching!
Joined: Nov 2003
Posts: 210
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The same calculations puts the TPS car at 422 rwhp and Rodneys car at 446 rwhp.(it's 442 rwhp in his sig) Good luck with your changes and hopfully you can get it worked out before all the -DA is done for this year