Question about pistons
 

Would I have to do anything extra to my engine if I was to get the Mazdaspeed pistons with 10.7 to 1 compression? And the Mazdaspeed intake and exhaust cam set?

there is no such thing. Your terminology is off....

The higher compression pistons from Mazda are J-spec pistons. Same with the cams. Nothing special about them. They offer a little better lift and duration but you'd probably get a better gain out of a good intake and full exhaust.

p.s. the cost of those pistons and the labor to put them in is going to be HIGH. I would look into sort of turbo/supercharger instead.

Alright, I was planning on getting a new intake (Injen RD CIA) and full exhuast (obx headers, Borla or Magnaflow exhuast). just felt like seeing what it would take to have a slightly higher compression and more lift / duration with some diferent cams. :)

I would recommend the Ebay CAI that most of us have. (Do a search to make sure you get the right one). Also, the obx header is nice. There is also a guy named Wagner who makes a shorty header that bolts up to the stock cat or he can make a hi-flow cat/downpipe for you. Also, there is another company that supposedly offers headers for our car but I'm going to be looking into them next week so I don't have any details on them just yet but they are a 4-2-1 design where as the obx is a 4-1 design. 4-2-1 is slightly better for midrange power but I doubt it's anything you'll be able to tell since it's only about a 2hp difference on a dyno.

Borla is a nice catback, racing beat, magna flow, and corksport all have nice CB's for you to.

The Ebay cai ur talking about did you buy it off Ebay.com just wondering. Im pretty new to the scene and want to learn as much as I can.

Thanks, Ian

yeah we get them off ebay and they are typically $48-60shipped. If you do a search on this forum for "ebay CAI" you'll see pictures and discussions from everyone talking about where to get them and who to get them from.

But is the performance still there? compared to the Injen, AEM etc... do they compare or not.

yup....a bent tube is a bent tube.

alright, lol :)

You may get better gains from the basic bolt ons, but cams and pistons will definitely help.
It's all about combination. Better flow is a good thing. Bumping up your compression from 9:1 to 10.7:1 will make a big difference I'm sure.

actually without the fuel and spark control to take advantage of the higher compression, you wont see much of a gain from the pistons...ESPECIALLY when taking into consideration the labor involved in the install

You said in another forum that the stock injectors would be fine and the labor issue is not a problem at all.

stock injectors ARE fine for an NA buildup, but you still need to control how much fuel and spark is being delivered to get the power out of high comp pistons..stock fuel maps are HARDLY maxing the duty cycle on the injectors....and show me where i said labor wouldnt be a problem...quite the opposite...installing pistons is quite labor intensive

Nah, drain oil, drop pan, drop guts, put em together throw it up in that hoe!
Well, slightly more complicated. No more than 2 to 3 hours and a lift.

N/A motors tend to run stronger when slightly leaner than rich. So he's prolly right about stock injectors doin the job.

So the stock injectors will not be able to hold 10.4:1 comp setup??? I am not going all raced out. Just raising the comp to what the J-Spec motors has.

Alright, so The pistons and cams will give me some extra power But I'll need to change the fuel and spark delivery and power??? (new plugs,new wire, new ignition coil? Help me here lol) The labor part should be too much of a problem for me. I will be going to UTI in a year or two but a few of my friends there right now and they can do it for extra credit/project. Also, How much power can i expect if i get the injen cai, wagner headers /w highflow cat, magnaflow exhuast system.

Of course they do..running a tad rich will never make more power....it's just safer than running too lean....just buying the higher comp pistons and "slapping them in" like you say though is a waste of money and time,it will yeild a gain but not nearly as much as with control over the fuel and ignition timing..and I'm not probably right about the injectors, I am right...guys on here are running on stock injectors with turbo and just an adjustable FPR to deliver extra fuel. Trust me higher comp pistons arent going to come close to the fuel demands of 6+lbs of boost

The fuel is a major issue. Just look at the AFRs on my dyno graph. Sheeesh.

yeah my MSP was GARBAGE....I had my own custom cat-less exhaust with an air filter on the MAF and at stock boost I was hitting sub 10's in the AFR's at full boost...The dyno operator looked at me and said "Something is wrong with your car"....I said, "Nope mazda ecu's are junk."

Every pull we made was lower than 10:1 on the AFR...it sank like a rock as soon as boost came on. I bet my p5 is about the same. I wish I had gotten WB readings when I dynoed.

I will though with the haltech.

You better...or else... :argue:

Most of the peope running boost have FMU's. Plus raising the comp to 10.4:1 would be the same comp as the Protege/323 in Europe. The injecotors on these cars are 210cc. Which is the same as US models. Yes I know that there fuel map is setup a little different than US models.