CX-7 Performance 0-60

[Dalton]

Do you have a US spec CX-7?

Yes - EU gets them like in August 2007

I had this baby from August 2006 (yippy)

 

[Dalton]

how "reliable" or maybe I should say "accurate" is the dashhawk regarding 0-60 (and 1/4 mile) times.

is it within the nearest 10th of a second accurate?

I 'm told, that to get most out of that type of performancemeters,
you should get Gtech Pro SS or Gtech Pro RR if you prefer datalogging

http://www.gtechpro.com/ (cool)

 

[HeavyH20]

I 'm told, that to get most out of that type of performancemeters,
you should get Gtech Pro SS or Gtech Pro RR if you prefer datalogging

http://www.gtechpro.com/ (cool)

The G-Tech claims to be accurate with zero to sixty since it measures the start with a momentum change. The Dashhawk gets the information from the onboard computer which detects the wheels spinning and also gets a message that 60.2 MPH is reached. Assuming that you have not put shorter tires on and your speedo is off by a ton, it does not get any more accurate.

I used to have a GTech and found it not to be very accurate. You need to on be a perfectly flat surface (no bumps anywhere or it throws off the G meter since it measures X, Y and Z), the item cannot be moved once it is calibrated (permanent mount suggested), and it is triggered by sustained acceleration (if you soft launch the car, the you can get some rolling time without the clock running). For example, if you calibarate on a flat surface and find a nice open spot that is slightly donwhill, you will accelerate with .52 and lose a little, say .02G so your run is actually slower. The 60 MPH is determined by math not by measurement. So, this much acceleration measured in G's for this long with this time and, voila, it can calculate speed. And, as an FYI, the accuracy they quote is the ability for the device to sense a 0 to 1 G instantaneous load within .01 seconds. Depending on calibrations, I found it was accurate within .5 seconds on a quarter mile.

Regarding mileage measurements. One item I have not tried, and it makes sense now, is to try and pull metric measurements from the ECU instead of US. Maybe those are sent out. I will report back, but if Dalton's is working on a US spec car, then it should be the same since the DashHawk and Scanguage read the same computer outputs (OBDII outputs).

One thing to consider. If you are doing back to back 0-60 runs and the weather is warm, you will probably heat soak the TMIC and see slower and slower times. Did you observe this?

Yes, I did consider this. All the 6.8 to 7.0 runs were heatsoaked runs during the day. The fastest 0-60 was a cold run. The car was started, brought to the acceleration area at 60 mph, stopped, then launched right away. It was also a cool night (daylight heats the pavement to about 10C over measured air temps - this is the air your car breathes), high barometric pressure (air density), no wind, and the road was cool (thanks to the evening weather). All that put together, and you get a good run. And, the Acura RDX with almost the exact same HP, torque specs and vehicle weight somehow does 6.5 0-60MPH consistently. Looks like they have their tuning down a lot better than Mazda.

 

[Koenig]

Yeah heavy, when you consider it's practically the same engine from the speed6 @ 274 when it first came out, and then put into the speed3, and now the cx-7

it seems as if they "de-tuned" the engine, and I bet there's some way to get the 274 rated hp from the engine....... just have to know how, haha.

Good to know how reliable the dashhawk is, thanks man....

 

[AWmustang]

Yeah heavy, when you consider it's practically the same engine from the speed6 @ 274 when it first came out, and then put into the speed3, and now the cx-7

it seems as if they "de-tuned" the engine, and I bet there's some way to get the 274 rated hp from the engine....... just have to know how, haha.

Good to know how reliable the dashhawk is, thanks man....

I don't doubt that a CX-7 engine is capable of that kind of power. But the engine isn't simply de-tuned for the 7. The speed6 and CX-7 use different turbos. The emphasis in the CX-7 was low end torque.

 

[Koenig]

I don't doubt that a CX-7 engine is capable of that kind of power. But the engine isn't simply de-tuned for the 7. The speed6 and CX-7 use different turbos. The emphasis in the CX-7 was low end torque.

I thought they both had the K20 ?

I guess not.... I thought I'd read that they share the same engine/turbo setup as the speed3 and speed6.

 

[Mazda3]

The CX-7 has a smaller turbo to spool up faster and lower the powerband 500 RPM to compensate for the heavier vehicle and auto transmission.

 

[Koenig]

The CX-7 has a smaller turbo to spool up faster and lower the powerband 500 RPM to compensate for the heavier vehicle and auto transmission.

AHHH....gotcha, so that means your turbo spools faster than mine and you make power sooner than I do, right?

 

[shadow1]

That is correct. The CX7 turbo has a smaller turbine housing for quicker spool up. Power peaks 500 rpm quicker. Unfortunately it also limits peak output, hence the lower hp rating for the CX7 compared to the MS3 or MS6.

 

[Mazda3]

AHHH....gotcha, so that means your turbo spools faster than mine and you make power sooner than I do, right?

Right. The CX-7 TQ peaks at 2500 RPM, the MS6/MS3 peak at 3000 RPM. It helps get the bigger CX-7 off the line, but the turbo also runs out of gas in the top end quicker. Which is why it only makes 244 HP.

 

[Koenig]

I wonder if anyone here is contemplating getting a k20 off a wrecked/junked speed6 and sticking it on the CX-7, lol I wonder why kind of results that would yield.

 

[shadow1]

That would be a good experiment. Or maybe we can just source the hotside for the turbo since the compressor is the same. I doubt there are very many MS6 junkers out there.

 

[Koenig]

you might be able to find the turbo itself, or the parts....... isn't the turbo the same one from the Audi's? you can find some audi's in the junkyard (lol2)

 

[HeavyH20]

No need to adapt the turbo, IMHO, since it works well. The issue is with the transmission shift points, etc. If they tuned it a little better, it could easily be a mid 6 second 0-60 vehicle like the RDX. If Cobb or CPE came out with a plug and play tune, it should yield huge gains for the money. So much so, that if you owned a CX-7, it would be a must buy item.

 

[Koenig]

No need to adapt the turbo, IMHO, since it works well. The issue is with the transmission shift points, etc. If they tuned it a little better, it could easily be a mid 6 second 0-60 vehicle like the RDX. If Cobb or CPE came out with a plug and play tune, it should yield huge gains for the money. So much so, that if you owned a CX-7, it would be a must buy item.

I thought CPE's standback works for the cx-7 just the same?

 

[shadow1]

CP-E is currently trying to come up with a ECU piggyback. They were looking for a donor vehicle last I heard.

 

[HeavyH20]

A stand back is very intrusive with all the wire and lead taps. A plug and play has no footprint and is a much easier installation.

 

[Koenig]

A stand back is very intrusive with all the wire and lead taps. A plug and play has no footprint and is a much easier installation.

this is true, but as of now they have no PnP for any of the cars..... speed6, speed3, etc.

I'm still waiting for them to get their PnP released..... since last I heard they received one half of their connectors and need to attach all the pins, etc.

When that happens I'll be getting it, unless COBB releases something first. But I would trust CP-E more since they have actual cars to work on/test with.

 

[HeavyH20]

this is true, but as of now they have no PnP for any of the cars..... speed6, speed3, etc.

I'm still waiting for them to get their PnP released..... since last I heard they received one half of their connectors and need to attach all the pins, etc.

When that happens I'll be getting it, unless COBB releases something first. But I would trust CP-E more since they have actual cars to work on/test with.

Cobb will have their PNP for the MS3 this summer. And, like CPE, they have actual cars to work on. They bought one for tuning and testing this spring. And, the ECU is the same as the CX-7 so it will require less rework to get the subsequent product out. The MS6 actually uses a different ECU, so that will likely be delayed further. So, it appears the CX-7 has more in common with the MS3 than the MS6.

 

[Koenig]

Cobb will have their PNP for the MS3 this summer. And, like CPE, they have actual cars to work on. They bought one for tuning and testing this spring. And, the ECU is the same as the CX-7 so it will require less rework to get the subsequent product out. The MS6 actually uses a different ECU, so that will likely be delayed further. So, it appears the CX-7 has more in common with the MS3 than the MS6.

That's a little retarded, but at the time makes sense, the MS6 came out first, and the MS3 and CX-7 hit about the same time...

Also cobb says on their website the release for the MS3 and the MS6 is both during the summer... but I'll believe it when I see it.