No sensible person tunes for water injection on a rotary. It is a safety measure - no more.

What about 14.5 psi? I get the strong feeling that you are pulling numbers out of your ***.

 

Of course people have tuned with WI. And its common sense lower boost is safer than higher boost. I'm just saying I don't think I would feel comfortable running higher than 14psi consistantly.

 

you're wrong.

 

no, you're wrong.....or maybe you think you know more than howard coleman?

 

dp

 

no u are ******* wrong. i am tired of debating this with you. i ran 15psi for 5 yrs. hundreds of guys here do. some guys run even more. u have had bad experiences with your car and blame boost or whatever reasons instead of blaming yourself. wake up.

i can quote a dozen people posting in recent threads in which thsi topioc was debated if u would like.

 

Sorry to hi-jack this thread (it seems to be off-topic anyway)
I'm debating getting a set of used M2s vs new BNRs.
Other than the new/used aspect, what are the pros and cons of each?
I've done some searching on the forum, but no real comparisons were definitive and everything was speculation and personal accounts - no dyno results or numbers.
I'm planing on pulling as much power out of them, sequentially, as possible. So which would be the best to do this with?

 

Bottlefed- Why did you switch from your Pettit twins? I have had mine for about two plus years and run 15psi with fast spool up and maintenance of steady 15 psi thru transition from primary to secondary turbo up to 7k rpm. I have toyed with going single, but would miss the low rpm capability that I now have. How did Pettit re-configure the internal dimensions on yours?

Has anyone had both the BNR and Pettit on the same car to compare performance?
Ron A.

 

isnt that the point?.....

I have been running stock twins on my stock port REMAN for 4 years now at 15+psi ....with a stock ECU!(aic) AND on stock "junk" 2mm apex seals(2mm apex seals are not junk...again its a user error issue).....so whats the problem??....do it right or dont do it....... Right??...lol.... Matty you are not alone...dont worry

 

Here are the stock ECU's fuel cut numbers:

rpm max boost
1000 11.8
1500 11.8
2000 11.8
2500 11.8
3000 12.2
3500 12.4
4000 12.8
4500 13.3
5000 12.2
5500 11.3
6000 11.1
6500 10.7
7000 10.7

Something isn't stock if you are hitting 15psi. (Or your boost gauge is suspect.)

 

He's using AIC (additional injector controller) injecting more fuel.

 

I bought an RX6 thinking I would be happy with the response and simplification of a single setup, but after having it for awhile now, I miss the instant boost of the seq. and had them dialed in very well (check my sig for mods since I haven't changed it from the Pettit setup). I was only running about 13psi.
I love the Pettits but they have nowhere near the potential of the BNRs or M2s. As stated, I want to see how much power is possible out of a seq. setup. When I bought the Pettits, I called around and found that Pettit really didn't do anything to their turbos to make more power - they didn't even port the wastegate:?
The internals were modified by me after seeing what Pettit did (or did not do). I ported the wastegate and re-radiused the exh. housing. I also opened up the turbine outlets, and exh manifold inlets.

 

NEWS FLASH------ HKS released a new thingy called the Fuel Cut Defencer about 15 years ago.....look into it.

yes....stock ECU with AIC and FCD.....works like a champ!

 

you're such a punk

good, hit the road, then

so we heard

ahhh....now it's "hundreds"....before it was "several"

why not go for "thousands" next thread?

you don't know anything about my car, so shut it

and I can quote a dozen more...including Howard Coleman, who races these cars

btw your spelling sucks

 

send me a quote that says u cant run 15psi on the stockers from howard coleman.

call me a punk or whatever u want but the facts remain that u are wrong and i am right. boostcrzy runs 15psi and he is only one to chime in. most guys that have the fuel and tune run 15psi. stop crying. Mrrx7tt runs greater than 15 psi, yellowr1 does, me, goodfellas did, boostn7, g's 3rd gen, and thats justt o name a few. eeveryone that spends the time to build the car right does. even rynberg runs 15psi and i consider him to be a pretty conservative guy.

stop spewing your bad advice to noobs who want to make their car fast.

several people have sent me pms already telling me that u are an idiot. stop crying and open your eyes. what is your reasoning again for not runnign 15psi?

 

One thing to note: 15 psi on the stock twins isn't the same as 15 psi on a nice single, or 15 psi on the BNRs.

You're talking about the difference between 350 rwhp and 400 rwhp, which is substantial.

 

sure thing nutjob

first statement, post #1

https://www.rx7club.com/showpost.php...82&postcount=1

those of you w the stock boat-anchor turbo system... you ARE limited to 15 psi on pump. you are limited to 15 psi on racegas. that's because the OEM turbos cavitate (outside edge of compressor reaches supersonic and can't hold on to the air molecules: result super heated low density low oxygen charge from 15 on up) and make less hp.




as BDC said, there are many different factors that go into engine load, aside from measured boost pressure

and as I said, you may get away with it, you may not, but the bottom line is pump gas octane rating/quality varies enough to make it risky...why risk it? why see how close to the edge you can get? bragging rights on an internet forum?

right back at 'cha, punk

stop whining like a jr. high kid, and post something logcal and well written here for ONCE

geez...

 

cornball with the owned icon. grow up.

he says above 15psi.

whats better logic then my own experience genious? u are the only nay sayer about 15psi.

your arguement is thesilliest thing that i have heard. if u get crap gas you are blowing up wether u are runnign 15psi or 13psi. lol .wow dude u are an ***.

lol why run 15ps u ask? for bragging rights on the internet? is this how YOU think? WOW! u are truly an embarrassment to yourself! i run 15psi for the very reason everyone else does. to go faster! isnt that why we all mod our cars. if u want to go fast in these cars u have to crank up the boost. if u want to spend a ton of money only to go a bit faster like you do...well thats your own prerogative

 

That's ENOUGH guys. Tone it down a few notches please. This is a thread about BNRs, not whether you can run 15 psi or more on pump gas. We just had two great informative non-pissing contest threads on this very topic. Post there if you want to keep discussing this but keep it civil. Thanks.

 

Bottlefed wrote: The internals were modified by me after seeing what Pettit did (or did not do). I ported the wastegate and re-radiused the exh. housing. I also opened up the turbine outlets, and exh manifold inlets.

Hmmmm. When I ordered mine from Pettit, the internal modifications you list were done by them. They were unable to get any used cores to rebuild, so there was an extra charge for a new turbo to use as their starting point, plus additional charge for internal machine work and ceramic coating. I'm satisfied with what I got, but from what you describe, it sounds like it was a custom unit.
Ron A.

 

I'm not trying to flame Pettit or anything, but have you opened up your "modified" twins?
If you do, you'll see that there is nothing really done inside. Compare it to a stock set and you'll notice a few grinding marks here and there but nothing to give one the impression that they will make more power.
As stated, they don't even port the wastgate. After a call to Pettit, I learned that none of the employees that worked there when they were selling these is employed there any longer. Cam answered a few questions but could only quote the old info posted on their site. Again, nothing about porting the wastegate or any major honing of the exh. housing.
My set is custom because I made it custom, not because of what Pettit did. My mods were done after talking with Bryan @ BNR and his recommendations.
Sorry for the rant, but it just upsets me that Pettit made claims that they made "power increasing" modifications and charged more than BNR's for a set of turbos that are nothing more than a fancy rebuild.

 

M2? Who else makes a upgrade for the twins besides BNR? Petit? Thats new to me and Well i guess this would all be new to me since its only been 5 days that ive had the car.

I heard you talking about porting out the exhaust manifold? Is there any benefit in that? How much can you actually port out of the manifold? Does BNR do this as part of his upgrade? Im really liking what the stage 3 can do but I really want to see about 450RWHP Sequentially setup. Im thinking a ported exhaust manifold and a Half Bridge port rebuild instead of a street port will produce those numbers for me?? Im actually liking the fact that you guys are admitting to nothing spooling up as fast as the sequential setup. Not even the Apexi kit huh, good, more reasons for me to do the BNR. I know Mazda made this Sequential setup for a reason, im just gonna tweak it a bit.

 

You've had your car for 5 days. I would suggest slowing WAY down and actually learning about things before just jumping in.

You are never going to make any where near 450 rwhp sequentially. It is almost impossible to make 400 rwhp sequentially.

A half-bridge would be dumb with stock or modified twins. It would not make sense until getting into medium to bigger single turbos.

BNR are the only upgraded twins that are actual upgrades.

 

+1. i8 couldnt have said it better. Do some searching man. there is a ton of info on this website some good stuff and alot of crap. guys like rynberg know what they are talkign about. get to know the guys that do and obviously pay more attention to their posts.

The only thing that i would add is given that you already are interested in getting 450rwhp i would strongly suggest looking into single turbo setups. the bnrs are pretty sick if u want to keep that stock appearance for emmissions purposes or have a goal of say 400rwhp with quick spool. but once u start talking about 450 and that u have only had the car for a couple of days i could tell that your thirst is going to grow beyond what a twin setup could do. Talk to Aspec tunning. The guy there knows a ton and makes some pretty sick kits that will better fit your goals i think.

 

Why should i have to slow down? I just want the information. The first thing on my list honestly is to convert it to 5 speed. the turbo replacement will come much later down the line. Info is all i want.

And im not new to this game at all. i had my T2 for 6 years beofre i decided to sell her. I know what im doing, the only thing i need light shined on is info about the sequential setup because i know nothing about them. And a half brige would not be dumb with the stock twins. I have a buddy that has it right now as we speak, he's breaking the motor in so he has yet to actually get on it. Its what you want guy not what someone suggests.