Compression Ratio - Can't Decide

[kamon8404]

where are they getting the gtx 4th gear? mazda doesnt stock these any more (or they ran out, however you want to look at it).

I don't have a clue. Its on their website. If you want me to email their link with the 4th gear lmk.

 

[mspHtown]

I don't have a clue. Its on their website. If you want me to email their link with the 4th gear lmk.

i checked it out. maybe ken can chime in hear. i was told awhile back by him that they dont make 4th anymore. unless these are used ones SU is getting.

 

[kamon8404]

They are stated as used but I wouldn't be surprised.

 

[Signature Sound]

Has cryotreating proven successful with anyone in this tranny? I guess it certainly must do better but how much?

I debated long and hard and finally thought how much I put into this car and decided on the PAR 1-4 set. I think my original plan for 300whp may go up a little higher since that was pretty much my limiting factor. Payment went through today gearset will be here in a week!

YOU LUCKY BASTARD!!! I am soooo fuggin jealous! When you told me how much them things are, I had to go on a search for a better price. YOU HAVE TO POST PICS!!!! I gotta see em.

 

[Captain KRM P5]

They are stated as used but I wouldn't be surprised.

mazda no longer makes the 4th gear. it supercedes to basically what we already have inside the current transmission which would be replacing an apple with an apple.

 

[orng1]

mazda no longer makes the 4th gear. it supercedes to basically what we already have inside the current transmission which would be replacing an apple with an apple.

Good to know.

 

[Captain KRM P5]

Good to know.

i tried to order them a few years back and was told they were 'pending revision'. when i checked back in on them the revision was to just use our current gear. which for a 130hp AWD 1.6 liter is probably fine

i've sold alot of the 3rd and 5th GTX gears and seen two sets come back broken. both were in cars making just over 300whp. will cryotreating strengthen them to the point they can go beyond that? perhaps, it surely cannot hurt them. on the rockwell scale they are 15% tougher than factory gears. there are those that argue lubrication - not strength - is the real killer of these gears which would hence render the strength argument moot anyhow.

edwin was talking to me about getting GTR gears (1.8 turbo non-US) which are supposedly stronger yet. price and availability is a sticking point i think though.

 

[shane02pro5]

YOU LUCKY BASTARD!!! I am soooo fuggin jealous! When you told me how much them things are, I had to go on a search for a better price. YOU HAVE TO POST PICS!!!! I gotta see em.

These were posted in Dana's broken 3rd gear thread by PAR! Yummy!!
The last pic is of my tranny last rebuild. Big difference and I have all needel bearings for the new setup .

 

[livelyjay]

What does the compression difference do to the daily driving aspect of the car? I mean, when you're not in boost, wouldn't a lower compression kill your "out of boost" power (not like the Protege is a power house to begin with)?

 

[Captain KRM P5]

What does the compression difference do to the daily driving aspect of the car? I mean, when you're not in boost, wouldn't a lower compression kill your "out of boost" power (not like the Protege is a power house to begin with)?

the difference from half a point of compression outside of boost is marginal, honestly. this what everyone has stated in this thread and other threads to date and my personal experience mirrors that. beyond that, any effect you may feel from that half point drop can easily be rectified through timing advance, precise tuning, etc.

 

[icespeed]

yeah, iiirc, the change in extra volume was ~1mm by the area of the bore... lol the stock ecu runs so rich anyways, it would probably help!

On a side note... what does everyone think about "breaking in" the new motor w/o engine management... I was thinking about driving 500 miles (non highway, non boost) or so w/o the afc or tuning, just so the computer can get a base reading before upping the boost and tuning. thoughts?

 

[mazdaspeedwerx]

I think running a engine hard when its new is a good thing. I have never done a break in period with any new car. I never had a problem.

 

[shane02pro5]

That's easier said with a new car with warranty but are you telling me if you invested a small fortune into a forged block you would just hop in and go balls to the wall!?

 

[BOOSTR]

I'd install all of my parts and not wait until the 500 mile mark. First time you run the engine in the car put enough load on it to seat the rings without babying it or abusing it. I do believe in breaking in the engine the way that you want it to perform.

 

[mazdaspeedwerx]

That's easier said with a new car with warranty but are you telling me if you invested a small fortune into a forged block you would just hop in and go balls to the wall!?

thats how I roll (drive2)