sixshooter

iTrader: (12)

Our engines don't like 8000 RPM and up very much. They are unfortunately not designed much like Hondas. More designed like a Kubota. Our heads don't flow well and the balance and strength in the bottom end is more like a jump rope than we would like from 8000 RPM up. It's really best for longevity to try to maximize the power the engines can make in the RPM range where they are designed to make power. Or you could go to billet main caps and balance everything and just be prepared to rebuild the engine as often as real racers do.

Have you ridden in a 300whp Miata yet? The light weight of the car helps you do a lot more with less. It's faster than my buddy's 600whp SRT8 Procharger Challenger.

Epsimega

Yeah from what I understand, going beyond 8000 makes the stock crank very unhappy. Funny, I almost went with billet main caps but talked myself out of it cause I didn't find it necessary if I didnt go to a stronger crank, which is FAR out of my budget lol. The MBSP and arp studs will have to hold her together.

No I have not ridden in a 300hp miata yet. In fact, mines the fastest one Ive been in which is dissapointing. Not many miata fans in this part of Texas. Before I bent a con rod, I ran a 9.3 1/8th mile with a passenger. 17psi boost on methanol with stock msm turbo and supra injectors. probably wasn't even 200rwhp....slow lol.

Epsimega

Its funny you saythat sixshooter. I really want to hang with hellcats. Not really building a drag miata but....I gotta grudge

borka

iTrader: (1)

300 hp in a Miata is nuts. im "only" at 250-265hp right now and its a wild ride. forget 1st gear and will roll spin 2nd gear and thats with a 5spd and 3.9 rear, so long gearing.

with your 6spd and 300hp, forget first two gears and im sure you will still manage to spin 3rd.

BP engines are not S2K engines, they make lots and lots of midrage torque. not a high revving screamer.
whats the point to spin a motor to 8k? you want to have more speed in each gear? get longer gearing 3.63 rear for example. 8k+ rpm is just unnecessary stress that breaks **** faster.

Savington

iTrader: (31)

Sixshooter and borka are correct, you don't need to rev the motor to 8k to make 300whp. In fact, it's less desirable if you don't, for several reasons (powerband, reliability, gearing).

ctdrftna

iTrader: (1)

there is no point in revving higher then needed, listen to these guys. once upon a time I built a engine with massive 290/13.5mm cams and it ******* killed torque but made insane up top. The power band was useless, unless your drag racing and geared to run between 6500-8000. Even drifting you would think that your in those revs all the time, and thats not the case. Burning tires I spent more time at 5k then I do at 7k.