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 Old 05-02-2014, 04:26 PM   #1
 
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Default Seen the light and modding CX7 for more power

Hi All,

I have a 2007 CX7 with 123,000 kms (about 77,000 miles). So far it has been running without issue.

However I just read the exploding motors thread which has got me wondering whether I should just sell it and buy a CX5 turbo diesel or something. I just did the feel for slack in the timing chain and cold start test and I think I am up for a new timing chain and VVT actuator. This was not detected by the dealer at the recent 120,000km service a couple of months ago. Interestingly when I took it back to the same dealer last month to inquire about the trade in value they quickly noticed it as a possible fault that lowered the value of the car. I will be getting some quotes and getting this fixed asap.

Once I have the reliability issue sorted I am thinking of modding the car for better drivability. I am interested in hearing from owners who have had success with mild modding of the CX7 for better drivability, less lag, a bit more power and hopefully slightly lower fuel consumption.

I have found a local Mazda tuning shop that wants $1700AU to dynotune and flash the CPU. However they mostly seem to deal with rotaries and they didn't inspire much confidence or give me the impression that they had ever tuned a CX7 before. So I am thinking of getting the tune after a few other mods are installed.

1) Has anyone else in Brisbane Australia have a recommendation for a tuner who know their stuff with Mazda DISI motors?

Having read lots of threads on this forum I am considering only modding the TMIC, TIP probably with a CAI and the blowoff valve (and engine mounts). I don't think I can currently justify the cost of exhaust or turbo mods which would probably lead to fuel pump mods etc etc etc.

2) Can anyone who had done these intake and tuning mods describe the benefits in performance? Was it worth the $3,000AU or so cost for you?

I have read that the turbo boost is reduced in first and second gear. I know this for sure for the 3MPS FWD.

3) Is the boost reduced in the first two gears for the CX7 AWD automatic transmission too? If so is this what gives an impression of very bad lag off the line? Can this be fixed with the tune? Should there still be some limit to the boost?

I am also considering options with the turbo for the future (lets just say mine failed in service). I have read that Mazda used a smaller version of the same K04 turbocharger on the CX7 to reduce lag, increase torque (and reduce maximum power by 10kW to 175kW).

4) Does the K04 from the MPS bolt straight onto the CX7? Is it externally the same size with the CX7 just running smaller internals? Has anybody done this successfully to get their 10kW back?

Alternatively I can get an exchange upgraded turbo for about $1450AU. BNR Stage 1 MPS Turbo | MPS Garage

5) Has anybody successfully bolted one of these onto a CX7? What were the performance gains?

I am assuming that I would need to upgrade the fuel pump if I upgrade the turbo in the future.

6) If I stop at the intake mods and tuning will I need the fuel pump upgrade? If not need is it still recommended for reliability?

I saw that another potential performance upgrade is to remove the rotating mass of the balance shaft from the DISI motor.

7) Has anybody done this? Does it make a noticeable positive difference to engine performance? Does it make a noticeable negative difference to vibrations from the motor? Is it something you would do on a daily driver or only on a track car?

I hope no one minds the lots of questions. Some of them I could not find answers too and others I am after some opinions.
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