Ideas on what I should set the rev limiter at on my new engine. I want to bump it past 7K for sure but I'm honestly not sure how far I can go without running into issues or damaging something.

Details that matter:

EFR 6758 0.85 A/R IWG V-Band Inlet @ 15-20 PSI
Supertech 84mm 9.5:1 (using E85)
Wiseco Rings (.017", .020")
Eagle Rods
OE Crank
ARP Hardware and Cometic 84mm HG
ACL Bearings (.0022" main, .0025" rod clearance)
Boundary S2 72 psi
ATI Damper
Volvo 418737 Springs
OE lifters and retainers
OE cams
OE valves
Very mild porting (casting flash removed) new valve guides and OE stem seals

I think 7500 RPM is still pretty safe but I want to hear from the more experienced.

 

Also, off topic from the thread but how do I become a supporter?

 

Do you have a Skunk2 Throttle Body? If you don't I wouldn't set the rev limit past 7200 RPM for fear of breaking the throttle rod and destroying stuff.

The higher you rev it the shorter the engines usable life

 

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Miata Turbo Forum - Boost cars, acquire cats. > User Control Panel > Paid Subscriptions

 

Skunk2 IM and TB. Kind of stupid how I had to drill a hole in a brand new TB but it is what it is.

Also interesting read. Would I even benefit from the higher redline? I am using a 6758 which can definitely keep up but with the stock size valves I'm not sure I would be doing anything besides shortening the lifespan.

Based on that 7300 RPM seems pretty good. I suppose I'll see the power band once it's on the dyno and go from there.

 

Thanks, had trouble finding that it's pretty buried in there lol

 

You would probably still have power up there, but is it worth the engine living a shorter life? Up to you really, I would rather just shift at ~7100 RPM

 

What is the car being used for?

 

Solely a street car that can actually pass people

 

with that turbo you can short shift at 6.5k and smoke STI's. no reason to go above 7k IMO.

Find a 3.3 or 3.6 diff and enjoy a low rev limit with endless torque and MPH

 

I wish I could find a 3.6 for a decent price..

But yeah if there's no reason to push the redline up then I won't, maybe 7100-7200 at the most so the motor lasts longer. Thanks for the input guys.

 

I've had mine at 7200 and I rarely go there. Plenty of power even shifting at 7k.

 

You’re going to see at the very least a flat line above 7, if not a drop off. Leave it at 7 without proper springs and cams. OE solid lifters or OE hydraulic?

 

Solid lifters, BP6D head

Completely forgot to mention that it’s VVT

 

Street car:

Rev limit at 7200

Advance intake cam gear to move the power band down. Spin tires, live best life.