MSD dashhawk questions

[AutoXRacer]

Thats the answer I was hoping for...
I was afraid it might have had a straight connector...but having a 90* bend will make it a much cleaner install...

Pictures would be nice!!!

Also, can you install it below the radio between the two knobs?
See image below!!

 

[dkswim]

pics thats what it looks like you dont notice it if you hide the wires or if your really looking for it

 

[dan1101]

Here are pics (taken in the dark) of mine. I tried to show from the back seat and from the passenger seat. Pretty stealthy.

 

[Falconx84]

jay- (or those who have the 2.4 beta) - what sort of AFR are you getting during normal driving? I tend to show 14.8 and under engine braking jumps as high as 29

doesn't seem normal, but I've never tried to monitor AFRs with any vehicle before

using oem wb #1 AFR pid.... should I be using commanded afr pid?


one more ? for you.... any idea if/when we can read oil pressure? maybe its a ford pid.....

 

[itzl0l]

does an ems like the stand back cause problems with the boost reading....or the atp boost cut thingy. I would imagine anything that effects the map sensor would thro it off

 

[dkswim]

any pigypack system of a map clamp that is ment to change the readings that the computer reads will effect reading you will see what the computer is reading.

 

[AutoXRacer]

So you are still reading correct parameters...?
Usually, sensor outputs are not changed since they are required outputs to then modify tuning tables...??? Right?
A/F will always be true, Air Temp, Coolant, Boost, Vacuum, EGT, etc...

Am I correct in assuming this?

 

[Jays07MS3]

jay- (or those who have the 2.4 beta) - what sort of AFR are you getting during normal driving? I tend to show 14.8 and under engine braking jumps as high as 29

doesn't seem normal, but I've never tried to monitor AFRs with any vehicle before

using oem wb #1 AFR pid.... should I be using commanded afr pid?


one more ? for you.... any idea if/when we can read oil pressure? maybe its a ford pid.....

Your readings are perfectly normal.

At idle or cruising, our cars are in closed loop mode. The ECU tries to get a perfect a/f ratio or 14.7:1 which is called Stoich. That is when you have just enough air and fuel to burn completely.

At WOT, its in open loop mode. The ECU dumps a lot more fuel than needed in order to cool combustion temps. Our cars run really rich < 10:1 at WOT. But I've seen as high as 11.5:1 on the DH when the temps are really cold outside.

When you lift off the throttle, the ECU also goes into open loop mode. But this time the ECU isn't adding any fuel so thats why the AFR's go sky high. There is lots more air entering the engine (due to engine vacuum) than fuel so the air to fuel ratio shoots through the roof. Totally normal.

And I'm not sure about oil pressure. It would definitely be nice. I would ask Ken over at the MSD forums. I want to know if we'll ever be able to read boost intake temp as well.


And dkswim is right. If you have any standback or BCD that fools the ECU into thinking there is less boost by tricking the MAP sensor then yes, the DH will display incorrect readings. Boost is just MAP - Barometric so if the MAP is sending the ECU false signals, whether its by bleeding pressure from it or trimming its voltage, the DH will read what the ECU sees not actual boost. I'm not sure about any other sensors but I'm fairly certain that if the ECU is receiving false values, the DH will also display false values.

 

[Jays07MS3]

all i can say is that it's prolly one of the coolest thing i have bought for a car

So I assume you got all your issues worked out then? We never heard back from you after your first few posts. What was the issue? It would be nice to know in case anyone else has the same problems.

 

[AutoXRacer]

(iagree)(bump)

 

[07speed3]

 

[dadasracecar]

They fixed the issue with a new software version.

One other tip for all the DH owners: The AFR in the mazda PIDs is the commanded AFR. The Actual AFR is the reading from the sensor. Do not get that confused...

 

[07speed3]

They fixed the issue with a new software version.

One other tip for all the DH owners: The AFR in the mazda PIDs is the commanded AFR. The Actual AFR is the reading from the sensor. Do not get that confused...

whats the difference between the commanded and the sensor?

 

[dadasracecar]

commanded = what the ecu wants
sensor = what the sensor reads

 

[Kurt07]

I have a screen with the commanded and sensor just to compare them. They stay pretty much the same.

 

[07speed3]

I have a screen with the commanded and sensor just to compare them. They stay pretty much the same.

cool! where did you mount yours?

 

[mk_slayr]

I don't think you can read oil temp/pressure from the OBDII (MSD forum).

-mk

 

[dadasracecar]

I have a screen with the commanded and sensor just to compare them. They stay pretty much the same.

How about at open loop/WOT?

 

[Haltech]

I have cmd'd and oem afr and the commanded is going to change at WOT, obviously.. However, the wideband sure does

 

[Jays07MS3]

They fixed the issue with a new software version.

One other tip for all the DH owners: The AFR in the mazda PIDs is the commanded AFR. The Actual AFR is the reading from the sensor. Do not get that confused...

I just datalogged all four AFR PIDs: Commanded AFR, AFR 1, AFR (Mazda) & Actual AFR (Mazda). All of the last 3 AFR's read dead on with each other, 14.7 at cruise idle, 29.3:1 during engine braking, & ~10:1 at WOT. So I don't believe the mazda ones are "commanded" AFR's. If so then, you wouldn't see them change at all during idle/cruise and you wouldn't see them shoot to 29.3:1 at zero load conditions. At idle you'll notice all but the commanded hunt around 14.7 +-.2 or so but the commanded is rock solid at 14.7 as it should be. I can post up the log tomorrow.

I'm still using Beta 9 so maybe you're using 10 which might account for the differences.