Stock compression?

[infrared5]

Does anyone know what the stock compression is on the P5???
I know the mazdaspeed high compression pistons put the comp at 10.7 to 1, but how much hp would that translate to?

 

[low_psi]

stock compression is 9:1

no idea how much hp that is. no one has ever dynoed just the pistons to my knowledge.

mp3moose has HIC in his mp3, btw.

 

[mp3moose]

Its not a lot of HP without tuning. But pistons, cams, and some engine management will translate into about 20horses. Hopefully. Anybody want to make me a piggyback or standalonne?=)

Moose

 

[Installshield 2]

Its not a lot of HP without tuning. But pistons, cams, and some engine management will translate into about 20horses. Hopefully. Anybody want to make me a piggyback or standalonne?=)

Moose

Stock North American FS-DE has a static compression ratio of 9.2:1...Australians have 9.7:1...

The cams and intake manifold make up only 10bhp or so of the FS-ZE's 40bhp jump on the North American FS-DE...The high compression and OBD-I ECU make up the other 30bhp (for 170bhp or so)

the Mazdaspeed pistons (10.7:1), which were in Japan's version of the MP3, are said to make another 8-10bhp over the stock FS-ZE with 10.4:1 compression...which despite Mazda of Japan's rating of still being 170bhp was more around 180bhp...

Moose; with cams, management, and high compression pistons a little over 40whp will be easily achieved...

 

[VividMP5]

Installshield,

I read from another post that Twilight stated the Aussies have 9.7:1 compression ratio, and you're saying the the FS-ZE has 10.4:1 ratio, isn't the J-spec and E-spec the same?

 

[mp3moose]

I thought that it was 9.1:1 in the states??

Somebody please make me some management!!

On a side note, isn't corksport suposedly introducing some agressive cams for NA applications soon?

Moose

 

[Installshield 2]

Installshield,

I read from another post that Twilight stated the Aussies have 9.7:1 compression ratio, and you're saying the the FS-ZE has 10.4:1 ratio, isn't the J-spec and E-spec the same?

In most cases yes such as with the J/E-spec EVO's...Mazda didn't do that though...Australia (also remember Twilight is from Australia, not Austria which is in Europe) and New Zealand I believe recieved the FS-DE, the same as North America, except for slightly higher compression and different management for an output rating of more around 138bhp...I also think this the same for European 323's...I think only domestic Japan still uses the FS-ZE and OBD-I ECU (the only management system the ZE uses, Mazda never re-wired the harness etc. for other countries)

Also the Mazda spec manual from mazda motorsports says all North American 2001+ FS-DE's use a static compression ratio of 9.2:1...

moose sit tight...I am working with Tariq from Link-Electro-USA and some engineers from New Zealand for a LinkPlus engine controller...Completely stand alone system, we are trying to crack everything needed for them to provide a wiring board that utilizes the stock engine harness...It is a round about way of making the system a complete plug and play setup (no wiring at all), that utilizes the factory tach and alternator for less than 1 grand!...We will hopefully have it done before christmas...

 

[mp3moose]

Install,
AWESOME NEWS!!!

Be sure to keep me posted on this.

Moose

 

[twilightprotege]

install you're right, us aussies got 9.7:1 comp ratio, j-spec intake cam, no VCTS, and ECU tunned for 95ron octane unleaded minimum (i'm running on 98ron). those are the differences that i know of engine wise

 

[Matthew]

why is our compression so low. everyone i tell is like wtf that is the type of compression you'd want on a turbod car.

 

[twilightprotege]

all i can assume why you have lower compression is because of your crappy fuel ron levels

 

[twilightprotege]

i should add as well, the lower compression is probably why your VICS opens earlier too. with the aussie car, our VICS doesnt open up until about 5500rpm...i'm pretty sure yours open eariler

 

[VividMP5]

Install,

Thanks for clearing it up!!

Hi All!! Let me take this moment and introduce myself, I've been on this board since July, and I've only been reading the forums and gathering as much infomation on the MP5 as I can and let me tell you, there are some very knowledgeable people on here! I think this is the best PROTEGE forum around!! Now I've just started to get into tuning up the MP5, so it can be more driveable. GOD, we all know that the MP5 can use more ZOOM!! So far, I've changed the pully, intake cam, AEM CAI and soon the RacingMazda headers. Then a higher compression piston, then have the intake manifold port and polished and hopefully that Plug and Play system that Install is working on. I'm hoping to reach 200whp when I'm done.

 

[twilightprotege]

welcome!

you can get to 200whp na with proper tuning. keep an eye on my posts shortly when i get my ported head and cams installed (weekend of 18-19th october). with my current mods i got 103.5whp, i'm hoping to jump to atleast 125whp...hopefully more...i'm sure 125whp wont be any problem...and that's with relatively minimal mods!

 

[Installshield 2]

install you're right, us aussies got 9.7:1 comp ratio, j-spec intake cam, no VCTS, and ECU tunned for 95ron octane unleaded minimum (i'm running on 98ron). those are the differences that i know of engine wise

Damn...I was unaware of the ZE's intake cam, I thought the only difference was the compression and ECU...

Moose, I will definately keep you posted on this...it is the cheapest system I have found with all of these features, despite still having excellent resolution and very easy to use software...It is not as elaborate as a TEC-III, but it also isn't $2800...

Matt, us north americans have low compression for emission purposes and low octane fuel...I don't think any FS but the North American models are "U-LEV" (I may be wrong, but the FS-ZE with the OBD-I ECU is not)...lower compression does not require as rich of a mixture during cold starting in some cases, and usually handles climate changes better than some (High compression BMW M3 engines sometimes won't even start in extreme cold)...9.2:1 is not as low as most heavily boosted stock engines, which are usually in the 8.~:1 neighborhood...Also part of it is for fuel use...the low compression allows us to use 87 octane,...higher compression needs premium usually to keep detonation at bay...

 

[twilightprotege]

yep definately the ze intake cam - that's why i'm trying to sell mine

 

[Installshield 2]

nice...Hey I will trade you tail lights by the way

 

[twilightprotege]

LMAO!!!! no

 

[mp3moose]

shibby, very shibby

 

[chdesign]

OK let me clear some things up......THe MP3 was not existant in Japan it was marketed as the Mazdaspeed Protege in Japan with a Higher conpression ratio, different exhaust and intake cam, different flywheel, and a 4-2-1 header it was a totally different beast than our MP3's. THe A-spec C/R is 9.1:1 in teh FS-DE and the E-Spec is 9.7:1 in teh FS-DE they get this higher compression but using the 9.1:1 pistons out of the FP-DE the 1.8L from the 99-00 model years. The FS-ZE used 10.4:1 compression pistons and are the only ones available from japan at this time. The Mazdaspeed protege in Japan in the 02 model year used 10.7:1 C/R pistons which to my knowledge are very very scarse at this time in the NA market.