Reading dyno graphics (help needed)

eDaniel · Post by **eDaniel** » Fri Jul 27, 2012 3:28 pm

What do you think of these graphics? My engine is H22A and the dyno is Dynapack Evolution 4022 4WD (measures via the wheel hubs).
Note the difference between the best and the worst run. The best run was taken on 3rd gear and the worst on 4th gear. Although I obviously hit the 180 km/h speed limit (on 4th) I notice that there is an interesting difference between the two graphics which is not only in the top end of the rpm. We actually did 7 runs in total, 4 in 4th gear and 3 in 3rd gear. All runs was virtually identical for the given gear so there is no problem with the dyno itself. I wonder two things - why is this difference between the measurements taken in 3rd and 4th gear and I also wonder if this result is good/acceptable for 147kw H22A engine.
TIA for your input.

Power and torque:

Torque and AFR:

Post by **Merlin** » Fri Jul 27, 2012 4:23 pm

Yeah 123.8kw is 168bhp. Thats a decent WHP figure. Im no tuner but I would have thought the difference between 3rd and 4th gear pulls is down to the way the dyno interprets gearbox ratios and how the power is delivered.

eDaniel · Post by **eDaniel** » Fri Jul 27, 2012 5:24 pm

It is actually a fhp (flywheel horse power

) as the dyno connects to the car via the wheel hubs, not using rollers. This means that the weight of the wheels and the tyres has no effect on the measurement hence the power figure might be a bit higher imo...
I think I might be pulling some dead horses

mercutio · Post by **mercutio** » Fri Jul 27, 2012 6:04 pm

torque curve looks a bit peaky

eDaniel · Post by **eDaniel** » Fri Jul 27, 2012 8:39 pm

Yeah, the VTEC kicks really hard

Anyone with the same engine with little or no mods? I'd like to compare my result

Yet I feel the smell of the dead horses

What are the usual suspects? Injectors, manifold leaks?

mercutio · Post by **mercutio** » Fri Jul 27, 2012 8:40 pm

valve timing?

eDaniel · Post by **eDaniel** » Sat Jul 28, 2012 11:51 am

Thanks for the advice. I will ask the Honda service to double check everything

In fact I had a lot of problems with the idle and the mileage but I solved most of them recently.
I know I said that already, but let me reiterate: AVOID That Guy (Tomm Robinson is his real name).
He obviously tried to repair the problem but with a great incompetence. First the EACV, FITV and Throttle Body was literally soaked with red silicone. At least 1/3 of the openings of the valves was filled with parched drops of that nasty silicone. Some of the gaskets was partially torn.
The biggest problem however was caused by incompetent valve adjustment. The guys at the Honda service told me that the intake valves of three of the cylinders was over-screwed by 1 1/2 revolutions!
I hoped to have fixed all the problems, but I'm not. I need my dead horses back asap

Cheers,
Daniel

Post by **Merlin** » Sat Jul 28, 2012 4:03 pm

eDaniel wrote:It is actually a fhp

Doh! Didnt see that!

spider · Post by **spider** » Sat Jul 28, 2012 5:38 pm

I'd be looking at your AFR if I was you - its all over the shop. Also where are the 4th gear runs as the graphs posted all look like they've been optimised for 3rd gear going by the ratio - 4th is normally a ratio of 4.570 or thereabouts. Sort out your fueling and I reckon a few of them dead ponies will come back to life.

eDaniel · Post by **eDaniel** » Sat Jul 28, 2012 8:30 pm

There are two results below the graphics. The green boxes show the values measured on 3rd gear. The yellow ones show the results from the measurement on the 4th gear. I asked them to combine the graphics for me so that I can easily compare the results as I think there is a strange difference between 3rd and 4th. I know it is wrong to test in 4th given the 180 km/h speed limit but the aforementioned difference is visible in the lower rpm also.