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Old 10-22-16, 02:08AM   #16
gtofreek
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Default Back to the Dyno again with RPM Intake.

Well, I happened upon a Performer RPM intake manifold, in as cast condition, and the customer and I decided to run it again to see what it does with the RPM intake. While we were at it we thought we would compare the Q-Jet, which so far has worked awesome, to a custom built HP 750 Holley that the guy I work with[Jeff] custom built for another 400 Pontiac. This 750 now flows 999 CFM, but still retains the standard 750 base plate, and venturi sizes. Jeff also makes special modifications to mix extra air in the fuel then standard. So we were curious to do a comparison, with nothing else changed.

First pull was with the RPM and the Q-jet. Timing was set at 32, where it made peak power on past tests. The same 3 tube headers were used. Points distributor. We made 3 baseline pulls. These results below are the best of the 3, which were all very close. This pull had the best average power. One of the pulls showed 524 FT. Lbs. at 3400! It peaked at 460 HP at 5600. What is interesting is the fact that the stock, un-ported cast iron intake made 470 HP at 5400 RPM. And the ported iron intake made 479 HP! But, the iron intakes only made around 503 ft. lbs. This RPM made as much as 524 FT. Lbs, and made over 500 ft. lbs. from 2800-4200 RPM's. The iron intakes carried the power out over a longer rpm range.
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Old 10-22-16, 02:09AM   #17
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Default Holley HP 750 test

Then I took the Q-Jet off, and installed the Holley. Nothing else was changed. What is interesting is although the Holley made more power, the Q-jet made more peak torque, and at a lower RPM. With the Holley it didn't make 500 FT. Lbs. until 3200 RPM, while the Q-jet did it at 2800 RPM. The Holley made over 500 FT. Lbs. over a 1200 RPM range while the Q-jet did it over a 1400 RPM range. We did 3 pulls with the Holley also. The best power of the 3 was 479 HP, and 524 FT. Lbs., while this dyno sheet had the best average, but not the best peak power.
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Paul Carter
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Old 10-22-16, 02:10AM   #18
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Looks to me that regardless of what intake this customer decides to go with, this thing is going to be a beast! The manners of it down at 1300-1500 RPM under full throttle is amazing! It's should be a real handful.
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Old 10-22-16, 02:11AM   #19
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Now, here's the amazing part. I averaged the torque and HP out from 2700-5500 RPM on these pulls, and here they are.

Q-Jet Average was 492 FT. LBS., and 380 HP.

Holley Average was 493 FT. LBS., and 383 HP.

Almost identical averages, even though the Holley made 17 more HP. But yet when you look at the averages from the dyno sheet[at the bottom] you'll see the average from 3800-5600 RPM. In that RPM range the Holley averaged 10 more FT. LBS., and 10 more HP. I'd say the Q-jet is a better lower RPM carb, and the Holley is a better higher RPM carb. Interesting.
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Old 10-22-16, 02:29AM   #20
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Here's a link to a dyno pull video.

https://www.youtube.com/watch?v=hCa9...ature=youtu.be
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Old 10-22-16, 02:32AM   #21
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Here is a reverse dyno pull down to about 1500 RPM.

https://www.youtube.com/watch?v=dVUO...ature=youtu.be
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Old 10-22-16, 02:32AM   #22
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Very interesting
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Old 10-22-16, 02:05PM   #23
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Track testing would show the holley outperform in every way.
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Old 09-15-17, 12:11AM   #24
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I have a question. I know there can be other variables with parts used in the motor build but what kind hp difference would you guess there could be with only 20 degrees total advance in the distributor? Curious because a few weeks ago I ran my car with a 455 on the chassis dyno for 2 pulls which were almost identical in hp and torque. Kind of a last minute thing so did not check anything. Next day went to run at the track and I figured I better check timing and it was only at 20 degrees total timing. Wondering about what the difference may be.
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Old 09-15-17, 02:03AM   #25
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I made the mistake of not disconnecting the vacuum advance when I set the timing when we dynoed it the first time, and made our first pulls with only 18 total timing. It only made 10 more HP with 32 total.
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Old 09-15-17, 11:46PM   #26
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Quote:
Originally Posted by gtofreek View Post
I made the mistake of not disconnecting the vacuum advance when I set the timing when we dynoed it the first time, and made our first pulls with only 18 total timing. It only made 10 more HP with 32 total.
Thanks Paul. I was curious. It made 438 hp at rear wheels at 20 degrees so I was curious approximately what it could be after we went to 36 degrees. Found out I had a couple there things that were off as well. Fuel pressure was only at 3 lbs and the rev limiter chip was bad cutting it out at 5000 instead f the 5800 it was supposed to be. Thanks again for the info.
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