The 2500-4500 range is a little low on torque. It jumps up around 4000 the biggest gains are up top i actuallly dont' have a peak HP number because the factory rev limiter came into play and at that point my HP number was still rising. The job MIGHT be able to be done in a day......but this is one of those things you don't want to rush.
High Compression DIY
- Thread starter chdesign
- Start date
The low end torque is less but the mid range is better. It is kinda peaky though I hit that 142 then it drops back down average torque is around 120-130 its a pretty flat torque curve for the most part though. Compared to turbo it still beats it......I dont' know what the results of the pistons would be in teh 2.0L though mine is the 1.8L which has a shorter stroke adn better rod ratio than the 2.0L which is great for a NA setup but for turbo it is totally the oposite...with turbo you want a good rod ratio yes but you want a stroker motor to make power which is what the 2.0L is only thing I can compare is that the BEGI turbo kit on the 1.8L made 120 hp the same kit on a 2.0 made closer to 150hp so you can see the difference in variables.
Oh yeah with these pistons its best to run 93 octane....you might be able to get away with 91 with the FS-ZE pistons they have a 10.5:1 compression as opposed to the 10.7:1 of the Mazdaspeed Pistons. Remember though these pistons were opitmized for Japanese gas which runs up to 97 or 95 octance I believe.
Thanks for that clear up man I didn't know about that difference. As for the tuning...there isn't much that we can do aside from a standalone. The Proteges ECU has an enormous aount of control of fuel that is very hard to fool. In the mode where the ECU does not take inputs from the O2 sensor a S-AFC will work to lean out the mixture some but it will not work in any other mode the computer just compensates and keeps the A/F ratio at stoch. As far as timing goes you may be able to use a Apex'i ITC I'm not sure no one has ever tried it or discussed it I thought about trying one but I'm not sure.....it will modify both the crank position sensor and the cam position sesnor so that no CEL will be thrown. Aside from these things a Greddy e-Manage will work if you can get your hands on one or just get a SDS EFI standalone....you don't have to use a laptop with it and its very easy to use and very good results have come from it on other cars from what I have read and seen personally. I hope that helps some.eMKay said:
If anyone is interested I have another set of these pistons with head gasket rod bearings, oil sump gasket and o ring honing tool and wrist pins all the hard parts you need for the swap minus the rings. I am selling all these for 300 bucks +shipping I'm cutting a huge deal on these here I bought them for another piston swap I was goign to do for someone but they backed out now I need to sell these.
