What's the specs on the engine/turbocharger?

[2kStang]

The only thing I could get from the service dept at the dealership was that the turbocharger "might" be a Garrett 65mm. He said he could swear that the boost was in the double digits which I find hard to believe for a factory TC. Not even a 2003-2004 Cobra runs boost in the double digits. At least not from the factory. Anybody have any valid information on the turbo setup?

Also, I can't find any information on the engine such other than the bore and stroke. I would like to know whether or not the pistons and crankshaft are forged or cast.

Thanks for any info anybody can provide.

[codecraig]

2kstang - I'd like to know the details of the turbo, intercooler and engine as well. On the mazda site they have contact info...we could start there.

1-800-222-5500
Our business hours are Monday through Friday:
8:00AM - 4:45PM (Pacific)
9:00AM - 5:45PM (Central/Eastern)


Perhaps we can try to find out. If I find out anything I will post it here.

p.s.
i have a 95 GT (the last 5.0) and a 66 with a 289! stangs are so much!

[codecraig]

Ok, from googling the net I have found the following:

The front suspension is from the Mazda MPV minivan and the rear suspension is from the Mazda5.

The 2.3L is the same 2.3L straight-4 MZR engine used in the Mazdaspeed 6.
The 2.3L MZR has a 87.5mm bore and 94mm stroke. Ford Power Products sells the engine as the DHE-423.

This information was found over at http://en.wikipedia.org/wiki/Mazda_CX-7

[CLTatenza]

I dunno if this will work or not, but a company called custom performance engineering makes parts for the Mazdaspeed6 which might work on the CX-7. Specfically they make a CAI, BOV flange, exhaust and soon to be downpipe. I know the CAI and the downpipe each add nearly 20whp each to a stock MS6.

www.cp-e.com

[Redshift]

The Cobra uses a supercharger, not a turbocharger. Superchargers are rarely more than single digit boost levels. For turbo's it's pretty common. I believe I read that the stock boost was 14.6 PSI, but I can't find that info again. The crank and rods are forged.

[rhino]

saw your board and was looking around and saw this post not sure if this realy help or anything, I am on the mazda3forums site and know that the t/b pressure the get the 2.3 on a 3 to around the same as the CX-7 is 7or8 psi. Find it hard to beleive it is in the doulbe digits, I know the company that designed to system for the 3 (way before the speed verison was thought of) had gone there and made crazy hores power, just not good for engine keep right now.

[Redshift]

Ok, I've been looking for where I read it, and I think I found it. This article states that the engine uses 15.6 PSI of boost.

http://www.autorent.si/fajli/Mazda_CX-7_1146479490.pdf

[shahram72]

15.6psi? Isn't that a little much? For a stock car? I have to admit, this is what's scaring me about this car. I love it, but almost 16 pounds of boost seems too high for longevity. I want it to last longer than the warranty.

[Redshift]

If they design it properly, it should last. Don't forget this isn't a new engine, it has been used in the MazdaSpeed cars for a while and been in the Ward's top ten engines list too.

[VIC7]

Greetings, I just purchased a Touring pearl white model 2 weeks ago. I read this in July issue of Car & Driver:

ENGINE
Type: turbocharged and intercooled inline-4, aluminum block and head
Bore x stroke: 3.44 x 3.70 in, 87.5 x 94.0mm
Displacement: 138 cu in, 2261cc
Compression ratio: 9.5:1
Fuel-delivery system: direct injection
Turbocharger: Hitachi
Maximum boost pressure: 15.6 psi
Valve gear: chain-driven double overhead cams, 4 valves per cylinder, hydraulic lifters, variable intake-valve timing
Power (SAE net): 244 bhp @ 5000 rpm
Torque (SAE net): 258 lb-ft @ 2500 rpm
Redline: 6700 rpm

Also, the TC seems to be a Hitachi unit (not Garrett) with a slightly recalibrater cold end impeller to spool it up faster than the MS6 unit and thus the boost coming in 500RPM lower at 2500RPM in the CX-7 vs 3000RPM for the MS6.

I'll post more as I gather more.

[VIC7]

I'm still getting used to the heavy flat spot (turbo lag) below 2500RPM though, specially when accellerating from stop lights, too bad they couldn't eliminate it completely, specialy with a 6 speed tranny, they should have played further with the gear ratios and given it a kick right out from a stop. Oh, well, gota live with it I guess.............

[WEZOOMN]

My Turbo Beetle spiked 21PSI and stabilized at 17PSI with the stock Turbo.
Granted that was with Chip, BOV, CAI and Catback exhaust.
Put 40K on it before selling it. Never had a problem and he spanked many 5.0 Ponys.
I think @ 6 months there will be chips & Catbacks for the CX and we will be equalling the MS6 HP!!
That is if you want to.;)

[Broly]

I am not familiar with the hitachi warner turbo..does anyone know the trim? I am betting that it is close to a small 16g or a built up t3. It should be good for atleast 20-23psi. If the cx-7 runs rich like the EVO8 a safc2, boost controler and turbo-back should make some serious power! I dont think 300whp is that far off..with minor mods and a good tune. In 6 months there WILL BE 350-400whp cx-7s out there!! My only reservation in all of this is that the ecu in most mazdas dont take well to mods, and require alot of r&d!!
It would be sweet to run a COBRA or STI and hand them there ass in a suv!! They really wouldnt see that comming!! :p

[gpd323]

APT has turbo upgrades for the MS6, MS3 and I am sure for the CX7. Want 300hp?? 400HP??

Its all there.

http://www.atpturbo.com/

GPD

[gpd323]

I'm still getting used to the heavy flat spot (turbo lag) below 2500RPM though, specially when accellerating from stop lights, too bad they couldn't eliminate it completely, specialy with a 6 speed tranny, they should have played further with the gear ratios and given it a kick right out from a stop. Oh, well, gota live with it I guess.............

This is corrected with the new ECM reflash. I had mine done yesteday and its scoots off the line much better.

This was and is not a turbo lag issue. It was the fly by wire connect between the go pedal and the electronic throttle bodies.

GPD

[Alpha Wolf]

I'm still getting used to the heavy flat spot (turbo lag) below 2500RPM though, specially when accellerating from stop lights, too bad they couldn't eliminate it completely, specialy with a 6 speed tranny, they should have played further with the gear ratios and given it a kick right out from a stop. Oh, well, gota live with it I guess.............


From what I have read lately, as the reflash cures this it is not turbo lag.

It is caused by our fly by wire throttles where what your foot asks for is not reflected in what the computer instructs the throttle to actually give you.

The reflash makes your imputs in this rpm range result in more throttle being applied by the computer...

[rxeght]

In Australia:

Engine type: 2.3 litre Direct Injection Spark Ignition (DISI) turbocharged in-line 4 cylinder 16 valve DOHC
Engine capacity: 2,261 cc
Bore and stroke: 87.5mm x 94.0mm
Compression ratio: 9.5:1
Maximum power kW: 175 @ 5,000rpm
Maximum torque Nm: 350 @ 2,500rpm
Throttle control: Electronic (drive-by-wire)
Fuel system: Electronic direct injection
Fuel tank capacity: 69 litres
Fuel consumption combined: 11.5 l/100km

Sorry no specs on the turbo.

[CX7POS]

I read somewhere from.. maybe it was CP-E... that it was a Hitachi, and they are in the process of mix and match cold side and hot side... not sure if they are changing turbine wheels for different compression ratio.

I have seen GT3071 as a replacement for the Speed3/6. Which to me... it's still pretty small... but of course, this is for non built 2.3l DISI motors.

[jonny_sin]

well i figure w/ such a higher compression ratio than older cars the geret turbo should make a considerable amount of diffrence and best is it would be pushing past the 300 mark with no issues...i just hate the fact that mazda put such a low calibrated map sensor that you would need a missing link to block out the sensors reading when using a boost controler to up the pressure

[rexercx7]

I've lost you jonny on this one...ie what's a "map sensor?" Did you mean MAF Sensor (Main Airflow Sensor)? Or is there a MAP Sensor also? I know what a MAF is and what it does...I moved the sucker down into my CP-E CAI unit when I dispensed with the OEM intake system and air cleaner! But a "map sensor", I don't know what that one is, or does...

Kindest regards,
rexercx7:cool:

[erhayes]

I wonder how much the crank & block can take in the way of HP and still be a reliable daily driver?

[shadow1]

The Hitachi turbo has a smaller hot side than the MS3/MS6. The lead engineer quotes the smaller AR ratio of the turbo on the youtube video of the press release on the CX7. Rexercx7, MAP=manifold absolute pressure sensor. Some cars meter air fuel via MAP sensors (Honda for example). MAP sensors are also used for OBDII engine management so the CX7 has one as well even though it meters air via a MAF sensor (mass airflow). The Dashhawk OBDII gauge provides boost readings on the CX7 from the factory MAP sensor.

[rexercx7]

The Hitachi turbo has a smaller hot side than the MS3/MS6. The lead engineer quotes the smaller AR ratio of the turbo on the youtube video of the press release on the CX7. Rexercx7, MAP=manifold absolute pressure sensor. Some cars meter air fuel via MAP sensors (Honda for example). MAP sensors are also used for OBDII engine management so the CX7 has one as well even though it meters air via a MAF sensor (mass airflow). The Dashhawk OBDII gauge provides boost readings on the CX7 from the factory MAP sensor.

I see, learn something new about turbo cars every day, it never fails... "Manifold Absolute Pressure Sensor", wow, what a mouthful! So we have one, for fuel metering, and the MAF does the air metering. Makes sense. I saw the Dashhawk in the Australian guy's car, most impressive item it is. I'm getting my G-Tech accelerometer tomorrow, or Wednesday, speaking of new devices. I'm looking forward to that. My wife and I will be busy doing tests on Wednesday or Thursday night, after traffic dies down and we can make some uninterrupted runs. Should be interesting!

Kindest regards,
rexercx7:cool:

[cpcx7]

does anyoe knows when the fuel cut comes in on the stock cx-7?/
thanks

[Raider]

Fuel cut can be caused by many things. In theory, you should not get fuel cut. If you are, dealership time. The most recent fix for a hesitation issue (most likely caused by fuel cut) is the o2 sensor being replaced. Seems to be a known issue, and fix. Knowing for sure you are getting fuel cut is the main thing. Diagnostics will support that you are.

[ERIC-TC]

I have a similar questions -When does 'boost cut' stop the fun on the CX-7? I know that with the speed 3 if you hit 18PSI and it stays for more than a few sec you will get boost cut.

[Raider]

Again, there are many variables for fuel cut, so it is tough to say. It is not something there is a set standard for.

[MAZOOM]

I have a similar questions -When does 'boost cut' stop the fun on the CX-7? I know that with the speed 3 if you hit 18PSI and it stays for more than a few sec you will get boost cut.

It could be fuel starvation, overboost, winter fuel cut, and maybe a few other things.

Most fuel cut issues with the MS3 have been solved with a higher flowing Cam Driven Fuel Pump, just like on the FSI.