Big Slice of Reality Pie., 2056 D-jet Dyno run Options

[Olympic 914]

Just got back from having the teener run on a Dyno.

Good and not as good as I expected.

Was hoping for at least 100 Hp, didn't make it.

This run was on a Mustang Dyno, allegedly a Dynojet Dyno reads from 12~15% higher.

First the good.

Runs were extremely consistent. the three runs printed pretty much right on top of each other.

Torque was way up there above 95 tq from 3000 to 4500. with no real dips.

HP numbers were very consistent with a nice smooth line from 2000 to over 4500

Now the bad

Max HP was only read at 88 Hp and max torque was 100.

If I add the 12-15% it comes to 100 Hp. But it is what it is.

Build is

2056 D-jet, Heads by HAM RS+, 8.6 comp. Raby 9590 cam, SS HEs with Triad muffler. I Have adjusted the MPS to what seems to run best for this car.

This car runs great and I just wanted to know what it was putting out, Not really planning to try to tune it for more power. Reliability is the key. and I am so far happy with that.

Dyno sheet added (Date/time is wrong, 5/06/21 8:35am)

[JamesM]

Were they monitoring your AFRs during the pulls?

Like others here I have to suspect accurate fueling may be an issue. Its pretty amazing how far off from ideal the mixture on these cars can be and still have them run decently.

PMB has been seeing dyno numbers over 100HP on stock 2.0L motors just from the conversion to modern EFI (utilizing stock d-jet intakes) I would expect you should be seeing at least that with your motor once properly dialed in.

[Olympic 914]

Were they monitoring your AFRs during the pulls?

Like others here I have to suspect accurate fueling may be an issue. Its pretty amazing how far off from ideal the mixture on these cars can be and still have them run decently.

Did not run a probe up the pipe, but the operator did monitor the AFR on my wide band AFR. He said it was in the md- high 11s at WOT.

So it looks like I could dial in the Full Load stop on the MPS a couple points.

Don't really know how much of a difference that would make though.

I am running single springs on the HAM RS+ heads, wonder if its starting to float the valves above 4500

Normal driving around AFR runs in the 12 ~ 14 range depending a lot on throttle position. I don't want to lean it out too much.

[Mark Henry]

Were they monitoring your AFRs during the pulls?

Like others here I have to suspect accurate fueling may be an issue. Its pretty amazing how far off from ideal the mixture on these cars can be and still have them run decently.

Did not run a probe up the pipe, but the operator did monitor the AFR on my wide band AFR. He said it was in the md- high 11s at WOT.

So it looks like I could dial in the Full Load stop on the MPS a couple points.

Don't really know how much of a difference that would make though.

I am running single springs on the HAM RS+ heads, wonder if its starting to float the valves above 4500

Normal driving around AFR runs in the 12 ~ 14 range depending a lot on throttle position. I don't want to lean it out too much.

At WOT, steady acceleration and cruise pulling to me the magical number is 12.7:1, if you have a flat line 12.5-13 AFR under load you're golden.
That would likely get you over 90hp, your torque is great, if you can lean it out just that hair I'd call it good.

Notice on all these graphs how the torque and HP nosedives after 5K rpm?
With a fully balanced stroker engine and a big carb cam I can move that peak to 5800 but that's it, therefore even on a T4 hot street, AX car there absolutely no reason to need it go higher than 6K rpm.

If you need to do 7-8k rpm then really you need a /6.