max boost on 13b internals?
 

what is the max boost you can run on stock 13b internals?
what things would you have to do to get there?
retard ignition and such?

it depends on the size of the turbo... and the compression you are running.

you need correct fuel, timming, and air cooling (intercooler)

What about with stock everything?

What about with just a walbro fuel pump?



How about with a totally built tII motor with s5 rotors and 3mm seals and major fuel upgrades with the stock intercooler and upgraded turbo?

stock everything 8psi...
walbro max 12psi with stock turbo,
stock ic about the same max 12psi with stock turbo. upgraded turbo should have FMIC and more fueling. (injectors and comptuer)

but I wouldn't run those without proper gauges etc. those are a max, I'll never run over 10 on stock IC and injectors. there is no reason to risk. I'll wait till I have the money to do it *right* with haltech, FMIC, etc...

Stock Turbo and Stock Intercooler are the two biggest restrictions

The turbo is only capable of around 260ish HP at the flywheel

450HP is easily achieved on a stock motor with bigger injectors, fuel pump, e.m.s, intercooler, exhuast, intake and most importantly a T04

I think clarifying the question is in order.


What is the max boost the engine internals of a Series 5 motor can take. Meaning give an answer in PSI.

Asking this question entails that yes you have a big-ass turbo and ALL fuel mods in order to reach said boost level. Given that the turbo and fuel systems are no longer a variable that holds you back, give a number on what the maximum BOOST level a stock series 5 motor can take(MOTOR, not fuel system, not turbo limitations, what can the motor take)

crispeed was running 30 psi. I'm pretty sure his new motor will be over 40.

The motor in "totaly" stock form can only take about 450bhp or around 20psi depending on your setup, you may need 30psi to make 450bhp???

When properly clearanced and blueprinted the stock "modified" internals can take 700bhp+ or 30+psi (again depending on your set up you may need 50psi to make this power if your set up is shit)

So 450 bhp totaly stock and 700+bhp in stock blueprinted form, take your guess in the psi rating ? It is dependant on ALOT of factors.

But std setup's 20psi would be the "reliable" limit I would run on a 100% stock mazda engine.

thank god someone finally got their head out of their ass and answered the question that was asked.

thank you then i will shoot for 20 psi

excuse us for asking for his defintion of 'totally stock'

go back to lala land........

as I said on the first post it depends on the size of the turbo. 20psi on a huge ass turbo will blow it up easy. 20psi on a normal size turbo might be ok. psi by itself means nothing. it's about volume and mass. A bigger turbo will pump more air at the same PSI, creating more power, therefore puting more stress on the engine.

I also said it depends on compression, since the first guy that answered has an 83... and I wasn't sure if he was planing on trying to turbo that or not. on an N/A engine with higer compression there is no way you could run 20. maybe 10-15 if you have the right fuel and timming.

there is also no way you could run 20 psi on a stock turbo, it will kill itself at anything over 15.

What is stock blueprint form?

This must be one for the record books

Holy thread necromancer!

What he means by "stock blueprinted form" is reasonably new/useable (not worn out) precisely clearanced and balanced at a machine shop. From factory for example, the rotors are balanced "close enough". If you where to have your rotors blueprinted, a machine shop would put them on a machine and dynamically balance them, sort of like a tire.

shows how ignorant this forum used to be, and sometimes still is.

https://www.rx7club.com/time-slips-d...-rwhp-1000747/

i dig up a bigger dyno sheet if you need it. plenty of airflow mods (bridge port), but everything else is just OEM, they do like to buy new for a high hp build

Don't know if that is directed at me or not, I'll assume it isn't.

Blueprinting is a very old term used by people used to reciprocating piston engines. Blueprinting meant you had every piston and rod dynamically balanced at a machine shop along with the crank shaft counter weights. This allowed for more headroom to rev the engine without stressing things and breaking shit. Basically, you balance the whole reciprocating mass so that it can spin faster without damage.

Realistically, the rotors from mazda came already with a dynamic balance, perfect? no, but well enough to go to redline for short periods and high rpm for extended periods. The rotor tip comes within half a millimeter under normal conditions and even closer under tougher conditions.

A "blueprint" of a rotary engine entails dynamically balancing the rotors and eccentric shaft together. If you could ( you cant) get them balanced you wouldn't need counter weights, but I'd never risk it. For the money involved in that you might as well buy 4 rotor engine and have someone else install it for you.

oh i just meant the peoples concept of psi equals power. everyone always asks.." how much boost you running??"

Uh... No.

thanks for the insight, i was just making sure thats what he meant, i'm getting ready to rebuild my turbo s5 and wanted to know what all can be done before having to upgrade any internals or do any porting.

Maybe you missed the (you can't) part in parenthesis. :icon_tdow

Then it was a pointless statement. Why state the physically impossible?
I could fly to pluto (I can't) with a hot air balloon.

Jeez dude, dare to be great.

the counter weights balance the e shaft? the rotors have less to do then you think?
think about the fact the rotors spin at 1/3 the rpm the shaft, and therefore, the counter weights.
Oddly the counter weights are matched to the rotors instead of the shaft though..

i'm gonna smoke a fatty and ponder this one.. why CAN"T you balance the rotors to each other, and reduce our rotating mass... would free up some power for those N/a guys trying to make 500 N/a hp out of a 1300cc.
(yes that it one of my lofty life goals, to bring into the world a 500hp PPort 13k revving monster. with more secrets the king tuts tomb!)[/dream]

To underscore the point I made in the last sentence of that post.

"For the money involved in that you might as well buy 4 rotor engine and have someone else install it for you."

I meant "trying that" but whatever, I think most understood what I meant. I imagine if they hadn't, more people would have chimed in such as yourself.