Pace Car Dyno results
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From: Traveling the US
Pace Car Dyno results
I just got back from the dyno. What is a good % drivetrain loss number to use on a TH350 auto? 18%?
I am pretty happy with these results. My motor was a stock L-48 originally. It was rated at 185 hp flywheel.
I am pretty happy with these results. My motor was a stock L-48 originally. It was rated at 185 hp flywheel.
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St. Jude Donor '06-'10, '13
Re: Pace Car Dyno results (Rhys)
Not bad -- looks like you leaned out a little in the mid range --- I am sure Lars can help you on that !!
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Re: Pace Car Dyno results (BSeery)
Actually, the tuner said it was way too rich. You could smell the gas, but no cats.
We video taped everyone running on the dyno. Here's mine:
http://vettefinders.com/rhys/dynoday/pacecardyno2.mpg
[Modified by Rhys, 6:21 PM 8/25/2001]
We video taped everyone running on the dyno. Here's mine:
http://vettefinders.com/rhys/dynoday/pacecardyno2.mpg
[Modified by Rhys, 6:21 PM 8/25/2001]
Team Owner
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
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St. Jude Donor '06-'10, '13
Re: Pace Car Dyno results (Rhys)
Sounds REALLY good on the dyno.
Sorry - I read the chart wrong -- .
If I remember correctly, probably not, your want to stay between 13.1 and 14.1 on the air/fuel ratio.
Also know that leaner runs hotter. So if you have any cooling problems now -- get those fixed first.
[Modified by BSeery, 3:28 PM 8/25/2001]
Sorry - I read the chart wrong -- .
If I remember correctly, probably not, your want to stay between 13.1 and 14.1 on the air/fuel ratio.
Also know that leaner runs hotter. So if you have any cooling problems now -- get those fixed first.
[Modified by BSeery, 3:28 PM 8/25/2001]
Thread Starter
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From: Traveling the US
Re: Pace Car Dyno results (The Wanderer)
On my engine, that feels about right. But, as you can see, seat of the pants (torque) seems to keep increasing through that range up to 5200 (as per the equation).
Drifting
Joined: Mar 2001
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From: Indiana
Re: Pace Car Dyno results (Rhys)
Rhys, I just had mine on the dyno today too. The rule of thumb for loss though the drivetrain is about 15% for manual and 20% for auto. This is just a rough estimate but should be close.
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Re: Pace Car Dyno results (tsw71)
That is what I thought. I think we were using 15% manual and 18% auto on our C5's. I was not sure if there was a difference on a C3 driveline.
That puts me around 257-263 engine. Not bad for the small mods.
What did you pull?
[Modified by Rhys, 10:05 PM 8/25/2001]
That puts me around 257-263 engine. Not bad for the small mods.
What did you pull?
[Modified by Rhys, 10:05 PM 8/25/2001]
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Drifting
Joined: Mar 2001
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From: Indiana
Re: Pace Car Dyno results (Rhys)
That is what I thought. I think we were using 15% manual and 18% auto on our C5's. I was not sure if there was a difference on a C3 driveline.
That puts me around 257-263 engine. Not bad for the small mods.
What did you pull?
[Modified by Rhys, 10:05 PM 8/25/2001]
That puts me around 257-263 engine. Not bad for the small mods.
What did you pull?
[Modified by Rhys, 10:05 PM 8/25/2001]
As far as my dyno numbers, Lets just say that I was a little diappointed given the amount of effort that I have put into the top end of that engine over the past several years. It's about time for me to start ordering parts from Summit now :D I was very impressed with the numbers that the C5 cars were producing. The stock Z06 and other LS-1's were all over 300hp at the wheels. :chevy
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Re: Pace Car Dyno results (tsw71)
Not stock heads. They are stock heads off of some other 70's chevy motor. 993's or something. That was my first purchase on the vette. Old ones were cracked badly with leaking vavle seals. The shop had a set already set up. I think I should consider them "stock" though.
At least I am closer to the rwhp of my C5. Still a lot to go! I was kind of hoping the motor was going to blow up during the run. That way I could do it right (like Nomad78SA). Now THAT is a 78 with some *****!
[Modified by Rhys, 9:33 AM 8/27/2001]
At least I am closer to the rwhp of my C5. Still a lot to go! I was kind of hoping the motor was going to blow up during the run. That way I could do it right (like Nomad78SA). Now THAT is a 78 with some *****!
[Modified by Rhys, 9:33 AM 8/27/2001]
Drifting
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From: Indiana
Re: Pace Car Dyno results (Rhys)
I was kind of hoping the motor was going to blow up during the run. That way I could do it right (like Nomad78SA). Now THAT is a 78 with some *****!
Race Director
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From: San Jose CA
Re: Pace Car Dyno results (tsw71)
Tommy boy, I'll give you a hand with your motor if you need it. Just so I can learn the ins and outs of engine building... and maybe can be a bit more help when we work on mine. 
I'm shooting for 1500 rwhp. ;) Actually, 280 or so.. but hey. 265 wouldn't be bad either...
-Steve
I'm shooting for 1500 rwhp. ;) Actually, 280 or so.. but hey. 265 wouldn't be bad either... -Steve
Melting Slicks
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From: San Jose California
Re: Pace Car Dyno results (Pacin'California)
Tom and Steve,
I want to hear all the details! Had to work today and will be tomorrow afternoon too. Now that you have a baseline you can make the appropriate changes. This is where it can get into a lot of fun!
Chuck
I want to hear all the details! Had to work today and will be tomorrow afternoon too. Now that you have a baseline you can make the appropriate changes. This is where it can get into a lot of fun!
Chuck
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Re: Pace Car Dyno results (Pacin'California)
Now that the experts are back from Carlisle, can anyone tell me if 18% is the right number for driveline loss on my 78 auto?
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Re: Pace Car Dyno results (68shark)
Rhys, your dyno results are virtually identical to mine, both curve and the HP/TQ numbers (I'm 2 higher on torque). What mods do you have?
Burning Brakes
Joined: Jul 2001
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From: Ajax Ontario
Re: Pace Car Dyno results (Rhys)
Thanks! Other than the cam as listed in the signature below(XE262), mine is a 327 bored .30 over, hypereutectic pistons, "double hump" L79 heads with the 2.02/1.60 valves, 58cc chambers. Stock intake and exhaust manifolds and dual exhaust. What size valves, combustion chamber in your heads? Did you dyno before your changes to get a baseline? I didn't....wish I did!