DUB

(please point me in the right direction if there is already info out there)



My motor is apart at the moment...but that seems like the best time to get set-up (or get schooled).



I'd like to have a 9k redline, what should to be done?



I had my rotors and counter weights balanced by Rick Engman...and I should have discussed this with him, but the idea of having a 9k redline didn't come to me until I was home going over the work. (if all else fails...I'll go pick his brain some more)



Other work/specs on the motor:

Irons were lapped (street ported)

Exhaust street ported

RA 2mm seals

Solid corners

OMP removed along with emissions

Full Non-Seq (stock tt)

ALL bolt-ons

light weight flywheel (duh...counter weight"s")



that's all that's coming to me at the moment...



I remember reading that the tranny is the limiting factor to redline, any truth to that statement?



Anyhew...to the dicussion: WHAT should be done to prepare or maybe better yet, how to keep the torque curve up so I can make power up there???



Thanks to anyone who contributes to my quest!





(pic is for your enjoyment you know your motor parts are in good hands when you see this under the work bench )

DUB

sorry this is for a 13B-DUB in an FD

FikseRxSeven

hmmm people that have those motors should know well how to raise your redline safely

DUB

Yes, I know that...I don't exactly feel like bothering Rick with my 13B applications, catch my drift? I'd like to at least have "some" knowledge under my belt about the issue before I go back up there. So, I thought I'd ask here...

mazdaspeed7

If its an REW block, nothing really needs to be done. You already have the best engien bearings for high rpm, the hardened stat gears, and the high oil pressure. Other than that, its mostly a clearance thing.



Am I forgetting anything?

DUB

yes REW block.

Which clearances are you refering too? e-shaft??



any other ones?



opinions on the #200 oil jet mod and high RPMS? would the REW block need even HIGHER OPR to compensate at idle/low rpms?

TYSON

Horsepower is really dropping beyond 7000RPM thanks to the stock intake design. You might want to really port it out, but then your turbo housing is probably choking your motor at high RPM anyway. Even a half bridge, ported intake and BIG honkin' turbo may only move the power peak to 7500.



That blue line is boostn7, a very fast stock turbo car! The others are some pretty healthy sized single turbos. You can see they're all dropping.



For PEAK POWER reasons only, there is no reason to go to 9000RPM. There are other good reasons though.

DUB

I appreciate the leg work work Tyson (nice chart). I knew that was going to be an issue, that's why I was also inquiring about keeping the torque curve up into the high rpms.



Maybe I'm reaching/dreaming here, but why not?



I do see your point about the turbo manifold being the bottle neck (I remember talking with Bryan at BNR about this same thing) at high rpms...so a possible solution could be a custom turbo manifold with something that flows a little better than stock twins. I like the twins and will be keeping the car twin turbocharged.



how do ball bearing turbochargers perform at high rpm's??? Anyone have experience?



Also any info on N20 at high rpms would be nice. Any thoughts?

mazdaspeed7

Nitrous + boost + high rpm = boom



Ball bearing turbos would have little, if any advantage at high rpm.



If you want to make power to 9K rpm, plan on big exhaust ports, lots of overlap, and a large turbo. Stock twins will NOT do 9k rpm for long. And the manifold isnt the problem, its the turbos themselves. They simply cant flow enough to support 9k rpm.



The clearances I was referring to are the seal to seal and seal to housing clearances on the rotors.



Read the thread on the oil jet mod here.



It takes a lot to make use of 9K rpm. And Ive been loving every minute of it...

DUB

"And Ive been loving every minute of it... "



explain a little more please...you are making use of 9k rpms?







I've read that thread, thanks though.



"I had one engine running 36lbs of boost and a 150nitrous oxide shot all together for 2 hole drag racing seasons and did not take the engine apart. On every single brutal run the engine came back like it was never abused. Fresh and ready for more. I have alot more sucess stories, but you guys get my point. " - the Judge



"Nitrous + boost + high rpm = boom"



so is it the rpm part that pushes the envelop?