Evo X Head > Evo 9 Head > Evo 8 Head > 2G DSM Head > 1G DSM Head. So those of us with DSM heads have to do a bit more work to get them to keep making power at high RPMs. The typical aftermarket cams for a DSM are comparable to what came stock on the Evos. To run the lift that a lot of the Evo 8/9/X cams have requires actually modding the DSM heads more than normal because the retainers can hit the valve seals. The damn stock intake manifold on the Evo X looks almost like an aftermarket piece compared to what came on most cars.
Did the block or head get decked at all during the rebuild? Might explain the slight increase in compression if stock compression pistons were in fact used. Just a thought.
Did the block or head get decked at all during the rebuild? Might explain the slight increase in compression if stock compression pistons were in fact used. Just a thought.
Yup, both were. I thought about that too, but it still seems a bit on the high side. Oh well, I'm not gonna worry about it; its on the high side! I'd rather it be higher than lower.
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
Quote:
Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
Update time! I finally got some synthetic oil in the motor on Saturday, and found my way into Shane's schedule at DB Performance for some tuning. The goal really was for a nice mild street tune on pump gas; I have just started a new job and E85 is literally around the corner from my office now
I went in with expectations of running ~25-26psi, mild timing, and making power in the 365-370whp range. Tons of factors against me: snow tires (yes with snow on them, a LOT! I washed it off before getting on the rollers), when it's as cold as it has been, their dyno adds a teensy bit of downward weather correction, and I just generally have bad luck with making good numbers when I try and get a mid-winter dyno session in.
We got the car on the rollers and dried the tires off. I'm pumped b/c car actually is somewhat clean!
First pull, I had turned the boost way down on the new motor. Red is setup last summer w/ BBX but no tubular manifold and everything that followed and Blue is the new setup pretty much as it rolled on the dyno. Timing turned way down, mivec cranked down, fuel richened up a bit (or so I thought):
I said to shane, 'ok good! 21psi and the nearly the same power as kinda pushing the car last summer? Fuk yea! But no, we pressed on. 360whp@22psi. 375whp@23psi. 386whp@25psi. Wow! The car is making great power but wait, what's this? Sorry I don't have a pic, but the afr was creeping up from low 11's to nearly 12.0 starting at 7000rpm and ending at 8000. WAT!?!? After some playing, we come to the conclusion that I am pushing the limits of too many things:
-Stock MAF housing is at 4.9V as we turn the boost up, maxing around 7000. Gonna have to upgrade that.
-Stock Fuel pump may not be all it's cracked up to be on the interwebs (or mine isn't at least)
-DW800cc injectors (with my stock fuel pump) are hitting 100% IDC at 7000rpm and peaking at ~120% IDC.
Essentially, the injectors are likely going static and fuel pump is just giving up right around the same time and the MAF housing isn't helping things. Boo!
I'm watching sometimes in the dyno room and sometimes from the luxury of DB's new viewing facility on a comfy leather couch w/ a dew in hand:
We end up turning the boost down to 22psi (peak) and shane feels that is about the limit for the manifold testing we're about to do. So, we go to swap the manifold. Holy FUK I hope everyone appreciates this test! It took probably 3x longer than it should have. One bolt got stuck in the turbine housing, had to coax that out and run a thread cutter/tap through all holes, and then right around midnight we got it buttoned up and I plugged the rear CAS back in. SNAP! I BROKE one of the fucking PINS OFF! GAH!
Spaz sees Shane post a pic of me on facetube and runs up to help...he had shown up around 11 and listened to me b1tch as I was finishing up the manifold and dropping nuts and bolts into dyno never-never land. I had also been txt'ing Murlo...his car is put away for the winter....kazing! Spaz and I end up making the 18 mile trip from DB to Murlo's house at 12:15am and get there around 1am (roads were uber shyte most of the way), spend all of 3 minutes grabbing the sensor from him and then back to DB right around 1:45am. I spend 20 minutes swapping the PITA sensor and by 2:30am we are rolling and the car is ready to rock!
Everyone is now going to ask, what about the manifold test!?!??! PLEASE DON'T ASK! We're going to compile all of the data and post it very soon! I will say this: the two manifolds side-by-side are very similar and each have their strong points and in the real world they are damn close...still we DO have data to share! Please be patient (note the time schedule above and below).
Long story short? Shane and I stick around until 3:45amdoing this damn manifold test and in the end, I crank up the boost for ONE pull to see what this thing will do around 26psi.
MUAHAHAHAHAHAHAHHA YEEEHAW! 400whp on pump gas muthafukas! *400!* That is like 460whp dynojet! And with snow tires (I've seen -10whp from them) and -3 or -4% weather correction. Boost hits 27psi and tapers to 24psi. Make it hold 27psi? Some day yes! But not now, fuel starts going lean at like 5800rpm and ends up at 12.5 or leaner at 8000! The car runs SO GOOD it just needs a bit more fuel system to really shine.
Again, money is tight and getting home at 4:30am my wife Anna basically forbid me from doing car stuff 'for four months' LOL...The current plan is to fix the CAS and to get one of DW's 300 fuel pumps in the car for an extra margin of safety....then injectors...then a bigger MAF housing...then E85. All in good time! I turned the boost back down to 22psi peak (will verify on the street) and plan on just enjoying the car for the next few months. It runs freaking perfect, and I'm PUMPED about the power potential with just a bit more work.
THANK YOU SHANE for staying so late and the awesome tuning and advice (as always).
THANK YOU SPAZ for the moral support and the ride to Murlo's!
THANK YOU MURLO for the CAS in the middle of the night!
THANK YOU 3 hours of sleep, epic back pain (mani on dyno = bad idea), and cut-up hands!
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
Quote:
Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
Damn if I had know something as badass as this was going down, I woulda hung out for a while. Great meeting you, and nice to finally see the beaterX in person.
That's awesome, but in all honesty you are a master of ricer math. Just take what you have and run with it.
I'm sorry, I can't help it. I have a degree in physics and computer science and basically cannot help my brain from thinking about all of the variables and math. Add into it the manifold test, shane and I were analyzing every possible detail all night.
But yes, it is what it is and I am HAPPY!
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
Quote:
Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
Bloody Seal Bounce Champion!
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