What is the largest amount of horsepower anyone has hear of someone putting out with the stock internals on a 2L 3rd gen motor? I own a P5 and was wondering what kind of HP I can reasonably make before I have to start worrying about rods, pistons and such...

 

I think this belongs in the performance/modification area, so I moved it. I doubt your going to get any more than opinions. Not to many people have done more than simple bolt on mods to the 3rd gen Proteges, and therefore haven't spent much money on dyno testing.

 

How sure are you that we can run 12lbs of boost on stock internals? I guess anything is possible with good tuning. Damn Jesse, you have over 2700 posts.....

 

12 lbs on a stock FS would be pushing it IMO I woudl stick around 7-8 spoolin pulling 188 hp to the wheel to the tune of 8 psi so over 200 at the crank.

 

Spoke with a couple places about this. BEGI has completely disassembled the FS motor and from measuring things and looking at the design they are pretty sure it will hold up to 14 psi or so. They say the bottom end has oil squirters that spray oil on the bottom of the pistons for cooling which is a big plus. The Miata has the same system. Also, they say the pistons have a decent size top ring land and have a thick crown so should be able to take the boost. This is a major concern since stock pistons tend to have a small top ring land (to lower emissions due to less fuel/air mix being trapped there). They think the rods should be up to it as well.

Keep in mind that limit is with a properly tuned system. Will probably have to be an aftermarket ECU and it will definately need larger injectors and a better fuel pump to do it. But they're pretty sure the engine will be able to produce HP in the 230-240 WHP range on stock internals. The next step after that would be rods and forged pistons. The crank should be good for over 400 HP (crank HP).

 

Traveler, are you sure they were referring to the FP/FS engines using oil squirters? That's the first I've ever heard of that on these engines. According to Mazda Motorsports, the stock crankshaft is forged, they weren't sure about the rods, and the pistons are cast.

 

I talked with Mr. Bell of BEGI and he says the FS engine has squirters. Not the 1.8L. I don't know if this is something that was added but they've taken the engine apart, they've been in business for a long time, and they know a lot about turbocharging so I'll go along with what he says until I tear mine down. Which, knowing me, will be well before it actually NEEDS a rebuild... Hey, I'm just SURE I need 400 hp...

The stock crank is forged, the pistons are cast, but have a large top ring land which works better with the stresses of turbocharging. He also said the crown is fairly thick and doesn't get thin where the valve reliefs are, but stays consistent (thickness) all the way across the crown. They feel that with the proper fuel and ignition management that the engine will be able to take 14 psi. The kit they are building right now will be 6-8 psi and will be intercooled and leave the #1 cat in the stock position. They are trying to build a system that will meet emission regs even though they don't intend to certify it at this time. Their thought is that if they build it regs, they won't be dragged into court and their customers won't get fines for altering the factory emissions equipment. They know perfectly well that this stuff will be used on public roads!

They will be continuing to test this configuration on their way to seeing what the engine will take. Upgrade kits will probably be offered at a later date depending on what their research says they can do to the stock motor. They are expecting 165-170 wheel HP with the kit they are building now and are hoping to have an upgrade package that will push that to 230-235 wheel HP within a year.

This info is from a fairly long conversation I had with them about it. I've also spoken to Tripoint about their kit. They should have it up and running this week. I may call tomorrow.

 

Thanks for all the great info guys...funny how everyone assumes I want forced induction!! (which I do)