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427ci small block says hello to 7000RPM on the chassis dyno
Well it was a good day. I am happy, the little mouse pulls like a freight train to 7000 RPM. I will admit I didn't make my HP goal but this was just one base run, absolutely no tuning, not even a timing adjustment.
I knew the headers would hold me back above 6500RPM, like having a nice big block with 1 3/4" headers, ain't gonna work. I wasn't off by far an tuning could get me there but I did this because I want to just change to the new 1 7/8" stainless without any other changes to see the difference and I bet there's gonna be a few more ponies up top. My Vette is verified as 23% power loss from engine dyno to rear wheel chassis dyno, as I have removed my old 406ci and put it on an engine dyno then right back in and put it on a chassis dyno. This is to 7000RPM. MagnaFlow mufflers, I know a little on the quiet side so crank it up Rear tire speed was 186 mph, the dyno shuts down at 200mph :cheers: |
I'll go first.
560 HP and 536 TQ. Sounds great. :thumbs: |
Originally Posted by Gordonm
(Post 1573911293)
I'll go first.
560 HP and 536 TQ. Sounds great. :thumbs: |
Originally Posted by Gordonm
(Post 1573911293)
I'll go first.
560 HP and 536 TQ. Sounds great. :thumbs: That's good power on all motor:thumbs:. |
Ok, 547hp and 529tq.......sounds great Wayne.....
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Alright I can't take it anymore I was shooting for 500RWHP and got 478 RWHP and 448 RWT. I will make the 500 with the bigger headers I am sure.
I also have some stupid Car Chemistry baffles inserted right into the pipes to quiet the car down. That can't be helping either. But like I said I am happy and should be well over 500RWHP buy the time I am finished :cheers: |
I'll guess 480 rwhp
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i didn't see all of the posts when I guessed. I was very close, lol.
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Wow, watch the rear tires blow up. BTW, that looks and sounds like more than 478.
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Originally Posted by 73jst4fun
(Post 1573911654)
Ok, 547hp and 529tq.......sounds great Wayne.....
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Originally Posted by MotorHead
(Post 1573911253)
Well it was a good day. I am happy, the little mouse pulls like a freight train to 7000 RPM. I will admit I didn't make my HP goal but this was just one base run, absolutely no tuning, not even a timing adjustment.
I knew the headers would hold me back above 6500RPM, like having a nice big block with 1 3/4" headers, ain't gonna work. I wasn't off by far an tuning could get me there but I did this because I want to just change to the new 1 7/8" stainless without any other changes to see the difference and I bet there's gonna be a few more ponies up top. My Vette is verified as 23% power loss from engine dyno to rear wheel chassis dyno, as I have removed my old 406ci and put it on an engine dyno then right back in and put it on a chassis dyno. Now I can go ahead an tell you or you guys can guess the HP and TQ and I'll tell you tomorrow, whatever, I kinda like the guessing thing more so when it not even mine. The winner gets a banana sandwich for HP and potato chip hot dog for the Tq. :rofl: This is to 7000RPM, I'll shorten it when I get the time or you can just shut if off after the pull. MagnaFlow mufflers, I know a little on the quiet side so crank it up :cheers: http://img.photobucket.com/albums/v1...h_100_4924.jpg Rob.:cheers: |
What were the RPM peaks? Great numbers!
JIM |
23%, don't believe it.
Did you run open headers and intake on the chassis dyno? |
Originally Posted by enkeivette
(Post 1573912190)
23%, don't believe it.
If you're calculating the differnece between the engine dyno and the chassis dyno, you're prob not taking into consideration the full exhaust system which wasn't on your motor when you dynoed at the flywheel. Tires are OK they are ZR rated I think I was under 200mph but not by much, gotta calculate that :thumbs: |
Originally Posted by MotorHead
(Post 1573912377)
You can believe anything you want at least I took the time to actually do it. Of course you don't have a full exhaust on the motor, it's an engine dyno, doesn't even have a or alternator to drive, you are measuring what the motor puts out with nothing taking any power away it's call GROSS HP :cheers:
Tires are OK they are ZR rated I think I was under 200mph but not by much, gotta calculate that :thumbs: |
Originally Posted by enkeivette
(Post 1573912190)
23%, don't believe it.
Did you run open headers and intake on the chassis dyno? No and I am sorry I don't have time to argue about how GROSS and RWHP is calculated maybe others can help you :cheers: |
When you did the test with your old 406, right back in after the engine dyno as you said, you made 23% less power, right? Was that with a full exhaust? If so, then some of that percentage is due to the full exhaust, no doubt.
If you ran it open exhaust, then I stand corrected. But 23% seems pretty damn high for a manual trans car. Especially one with a modern manual trans. |
Great angle on the vid :thumbs:. Wish I was running that type of power. It would be smiles for lots of miles!! :D :cheers:
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Here's the printouts, the power drops off after 6500 but everyone seemed to agree the headers where choking it. :cheers:
http://img.photobucket.com/albums/v1.../HP-TQ-1-1.jpg You can see here it starts to go lean at 6500 an indication of something choking it off :cheers: http://img.photobucket.com/albums/v172/narod85/AF10.jpg |
Originally Posted by enkeivette
(Post 1573912677)
When you did the test with your old 406, right back in after the engine dyno as you said, you made 23% less power, right? Was that with a full exhaust? If so, then some of that percentage is due to the full exhaust, no doubt.
If you ran it open exhaust, then I stand corrected. But 23% seems pretty damn high for a manual trans car. Especially one with a modern manual trans. I at least spent the money and time to do the test and that is what it worked out for my Vette others are probably higher I doubt many C3's are much lower :cheers: |
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