401 sbc ready for the Dyno

[Tom68]

Weighs 3350lb on the scales on the ring rd BP.

If you go to Calder you'll have to drop in and put it on the individual wheel scales.

Scaled this beast recently.

20240331_082121.jpg

Does it need to go on a diet?

Nah, just get to optimise your wheel weights for best launch.

[HQM383]

In my reply to Tom above, I thought the test had lost some of it's merit with HEI to traditional small cap.
That said, if both were locked at 34°, then what? That would have revealed the differences in hardware and electronics as opposed to differences in timing at various RPM.

My thoughts are any difference would be within margin of error

I agree 100% on copying the curve from the DUI to the PI. But more to the point is the ease with which that can be done. That's the selling point. I believe that was what Andy was alluding to at the end of the vid. But yours breaking up at 6000 RPM takes some of that away though. What gives?

Now his mentor and cam selection, I'd like to see that too.

It certainly can be done with ease with the Progression. It would have been good to delve more into that and shown how he set the Progression up for the pull. I assume what we seen was the DUI light spring/heavy spring curve v Progression app generated table. Maybe he has detailed that in a previous video. My critique of the video is this omission could lead the viewer astray as to what contributed to the increased output of the Progression dizzy.

Mine breaking up could be the difference in cylinder pressure at that rpm. My 401ci is making 500ft/lb @ 6000rpm, looking at the graphs they are putting up on the videos his 408ci is putting out 415~425ft/lb @ 6000rpm.

I don’t think they will go for the mentors cam approach because they have set parameters for manners on the street rather than making it a dyno Queen.

[bob460]

Weighs 3350lb on the scales on the ring rd BP.

If you go to Calder you'll have to drop in and put it on the individual wheel scales.

Scaled this beast recently.

20240331_082121.jpg

My guess Tom 4750lb.......

[treyrags]

The video? He says early it’s a controlled test with all componentry held the same other than modules between the distributors so that’s what’s getting tested. In reality it’s timing curve that’s tested between distributors. If he wants to be “scientific” about a controlled test he has to copy the DUI dizzy curve to the Progression. The dyno output graphs have to be accompanied with timing curve for each run to draw meaningful conclusions between what they are testing. Maybe he has another video coming but he has missed an opportunity to show how timing can be dialed in with the Progression distributor on the dyno, which at the same time can be instructive to his audience on effect on ignition timing at various rpm and loads.

Yep. I was guessing the Progression had an earlier advance than the HEI. I even asked him but did not get an answer. Like you said, maybe he will in another video. I know mine yielded no discernable difference at the track with the same curve as the mechanical had but the programmable vacuum advance definitely improved the part throttle behavior and fuel efficiency.

[Tom68]

If you go to Calder you'll have to drop in and put it on the individual wheel scales.

Scaled this beast recently.

20240331_082121.jpg

My guess Tom 4750lb.......

Close.

Although this is with 200lb of driver.

20240331_093033.jpg

[Richie h]

Built a 401 sbc last yr 10.80 comp solid roller afr 195 heads ported made 555hp@ 6000 532 torque

[HQM383]

Built a 401 sbc last yr 10.80 comp solid roller afr 195 heads ported made 555hp@ 6000 532 torque

Good stuff. Anymore specs? What car is it in? Taking it down the 1/4?