codrus

Can you datalog it on the street? Put it in 5th at 2000 RPM, stand on it, post the graph of the MAP & RPM.

--Ian

Jeffbucc

OK so I got a hold of kyle who tuned the car and asked him why, compared to other similar builds it showed such negative performance and apparently in order for the Dyno to display the results on the Dyno he was using(not his own, a BMW shop's, he found that one of the sensors was faulty and had to deactivate it so it didn't go on the fritz when trying to get a plot. Also the power runs shown in the graph were done in fifth gear rather than 4th like I thought.

Here are the texts since he explained it better than I am.

aidandj

iTrader: (5)

Makes sense to me Problem solved.

codrus

That's a reasonable explanation for why the spool on the dyno was so bad -- just like if the run had been done in 2nd, with no load the motor is spinning up faster than the turbo can.

The only potential downside to this is that if it's not making full boost until, say 4500 RPM whereas it would make it at 3500 RPM on the street, that means there are a few cells that haven't been tuned on the dyno because he could never put the car into those cells.

--Ian

aidandj

iTrader: (5)

He tuned it with a load on it, just did the power pulls with no load. The load worked, but screwed up the graph if it was on.

Savington

iTrader: (31)

I feel for the guy. We owned a Dynocom unit for about 6 months in 2011. The manufacturer is beyond incompetent and the dynos are total junk.

Jeffbucc

Exactly. The actual tuning itself was done correctly with load since he was looking at the megasquirt data, but to get an accurate graph plot, he had to pull the load due to the sensor going on the fritz if load was applied

So the actual HP/TQ is accurate, just not the power in relation to RPMs, which is would show results much more in line with similar builds.

So I hope to get a few runs this weekend on a different Dyno in Vegas this weekend when I go down for the autocross on Sunday.

hornetball

iTrader: (4)

Correction. The torque would be accurate but shifted. The HP is a calculated number that requires accurate RPM as an input. You'll note that on your plot, you still crossed at 5250, even though the RPM is bogus. So . . . .

Enough drama. When is your track day?

Jeffbucc

Don't have one planned any time soon, but that is mostly due to being really busy at work lately....employees, equipment failure, etc...

I need to take a look at what events are happening soon and see what I can make.

18psi

iTrader: (76)

I come back from vaca and this thread has gone from awesome to over 9,000

well done el heffe that is some serious power and love the videos

PS: and I too was shocked by the lack of low end torque but the dudes explanation does make sense to me too

Jeffbucc

That is due to the advances in Turbo Encabulator technology!

humming

iTrader: (2)

ah yes, there have been leaps and bounds in the fields of magneto-reluctance and capacitive diractance.

Awesome build, awesome numbers.

Jeffbucc

Finally got some ***** from Brainiack

18psi

iTrader: (76)

you spelled it correctly, so I fixed it

Braineack

iTrader: (62)

just spell it phonetically like i did.

Der_Idiot

iTrader: (2)

I'd love to take a ride in your car sometime but after looking up your location I can understand why it's so tough to get a dyno. Maybe FM would be willing to open their doors for a few pulls? Not exactly close but hey you get to see FM...?

Jeffbucc

I'll get another run done in Vegas when time permitting, not huge on my importance list though.

Right now waiting on a few AN fittings from Fab9 to solve my fuel leaking issue once and for all. 70 psi rail pressure is a bit much for hose clamps and LAPS fuel line apparently. Gonna have full -6an fuel lines off the rail to the fuel regulator. All the AN!

BoostedSmurf

iTrader: (1)

I like this!

rleete

iTrader: (21)

Can he polish the braided hoses in the meantime?

Jeffbucc

I would but I'm experimenting with push lock fittings for the fuel system for a variety of reasons. Plus, everything is E85 compatible if I ever get my hands on it down the road.

(only in black)