Mahjik

iTrader: (1)

If a setup like that existed, we'd all have it.

FD3S2005

iTrader: (11)

a gb would be awsome but it would take alot of time like all the other gb's

rollingsband1

I know thats why the BNR non sequential would be a good choice for that wouldnt you think?? full boost by 2500-3000 rpm max?

Flybye

How a bout...BNRs are a waste of time UNLESS you enjoy the power of the sequential system?

I've SCCAs a many times, and I GREATLY enjoy the sequential setup having a nice power band that won't send me flying across the track. I'm also lazy and it's nice not having to down shift sometimes.

I've been in a T78, and the lag was....errr. It's like "Ok...here comes the power..............................*BAM* NOW!!!"

Running high HP with sequential just takes a lot of time and dedication to dial the entire system up right.

Mahjik

iTrader: (1)

There are more singles out there beside a T78.

What's your definition of "high HP"?

Mahjik

iTrader: (1)

You need to read Gordon's post about. He goes into a little more detail about what I was referring to. You need to quit thinking about "full boost", and think about "power". There are many single turbos out there which can have more "power" at 3000 rpms than upgraded twins even if they aren't at "full boost". Once again, you need to look at the dynos to really understand and then make sure you are getting the performance you want.

As Bryan mentioned, not everyone who owns an RX7 is on this forum. However, on "this forum", no one has gotten much past 380rwhp in sequential setup. IIRC, PFS had a race car which was close many years ago. Even then 380rwhp in sequential is rare, however around 360'ish is common. So if 360 sounds good, then that's the route you should go. IMO, an FD around 340-360whp sequentially is ideal.

Flybye

True. I haven't been around for a while. Perhaps there are "nicer" singles out now.

My definition of high horsepower when it comes to the sequential system is basically anything beyond 50+hp and/or with no cats installed. You know everything that needs to be considered. Boost creep, prespool, prespool vent (**** I've forgotten some of the names of these things) and WG management.

Took me the entire weekend just to tweak my system up when I good rid of all the cats (and no mid muffler). I probably did like 30+ runs adjusting the WG, and the rest of the flaps. Don't even feel a surge of any type at 4500.

Mahjik

iTrader: (1)

Flybye,

You kinda took my quote out of context. My point was that since anything over 380whp is more of an anomaly with the sequential setup. So if someone "needs' more power, it's more sensible just to go to a decent single than run upgraded twins in non-seq. Basically the end difference is going to be about $1200 from using BNR's verses a nice single. That's not a huge difference when you consider it. BNR's are a great upgrade for people who live in places which strict rules like California.

Flybye

Ohh. Yeah, if you absolutely "need" 400+ rwhp, a single would differently make things a hella lot easier. LOL. In setup, management, time & money.

Jeez...LOL...we can do 180ish with 350ish RWHP. I guess it's all the drag junkies who want 400+ Well...you know how it is. The more passing power we have, the better.

I know I'll end up with the BNRs someday, though. 350-400rwhp is plenty to keep up with most things in the showrooms today. Plus I don't see my self with a single in a tiny track.

rollingsband1

i cannot argue with you one bit with what you said.. if its still sequential 350hp is a butt load..

jmadams74

This is a little off topic, but I'm going to post it up here because this is becoming a very informative thread. This really only applies to BNR stage 3 sequential with Apexi PFC (and datalogit). My setup is as above with profec b, type s EBC (type 2 hookup for those familiar with this contoller) and all the supporting mods. Bottom line, I was having a heck of a time getting the boost and transition tuned in with the new BNR's. . .it was good, just not right! Then I read a couple of posts on setting turbo transition by Nashman69g in the thread
https://www.rx7club.com/power-fc-forum-47/pfc-boost-control-722648/
I have fiddled with transition settings a lot but what he said about setting up the transition made a lot of sense to me so I tried it today. It's like driving a different car! I think it's fair to say that those who have struggled with transition know that as long as you are full on throttle, it's not too difficult to get it pretty good (assuming all sequential support systems are functioning properly). But once you get into transition and your not on full throttle, all sorts of weird s--t starts happening. I'm not sure what the technical explanation is for the success of this setup, maybe the BNS's can carry the boost load to a higher rpm under less than full throttle relative to the stock turbos, but the car is just screaming better than ever with virtually no lag or hesitation anywhere! transition seems to be crisper as well but maybe my imagination. I'm maxing at about 14 psi now as I was having some problems last time Steve Kan worked with it and couldn't go higher at that time and I don't want to turn it up higher now without being very careful! This simple adjustment to the transition has done more for performance and response than anything else I think I have ever done to the car! Obviously, test at your own risk. . .hope this is helpful to those working with BNR stage 3 sequential setup.
--Jeff

FD3S2005

iTrader: (11)

how many ppl had this prob ^ with the seq?

matty

i say in the end whats the difference between 360 and 380? why would someone bust their ***** for the 20rwhp?

rollingsband1

cause thats 20rwhp they didnt have before :-P

matty

yeah but going from 360 to 380 means alot in terms of money mods reliability. the cost to the value is extremely high. if u want more then 350 go to 450 it will cost u basically the same thing.

GoodfellaFD3S

iTrader: (213)

There's more to it than just peak rwhp, you should know that

GoodfellaFD3S

iTrader: (213)

Matty, are you on crack?

Going single the right way (without any shortcuts or bullshit ebay parts) will end up costing about double what the BNRs are when all is said and done.

Edit: speaking of busting *****, it's all in good fun man

matty

i def do. but just saying...i am sure u see my point

matty

double? i completely disagree. i think u are looking at 1500.

rich itemize it out for us.....i think you are wrong.

matty

completely agree

GoodfellaFD3S

iTrader: (213)

35R turbo kit with wg plumbed back into dp from a place like A Spec, Gotham etc runs around 3650.

All the other small parts needed.....scroll down to see the list, not everyone will need all of it, but the costs add up, trust me:

http://www.negative-camber.org/crispyrx7/gt35rpage4.htm

BNRs are 2350, you can easily spend an extra grand with all of the extras to make everything fit right. There's your 4700.

Remember, the BNRs bolt right up to the existing setup. There's something to be said for that.

BUT, for those looking for monster power of 450+......

matty

i think the sole difference is in the price of the kit. in this case, 1300. maybe add 200 for little stuff. both need fuel upgrades, both should have an upgraded clutch, both should have upgraded ic's, both should have an upgraded intake (intake could actually be cheaper for a single), both should have hks twin power, both should have upgraded exhaust. i dont know rich.....

GoodfellaFD3S

iTrader: (213)

Matty, i've personally been there man. Did you see the picture of my engine bay up above ? Ihor and I have also installed a variety of single kits on quite a few customer cars at this point.

I'm not making this up, I promise.

The only way to lower the differential cost is to either cut corners, or to piece together your own setup, ie manifold, dp, etc etc. Everyone has their own way of doing things, my way is certainly not the only way.

Or, I suppose if you're a fabricator extraordinaire you can freaking make your own kit

Mahjik

iTrader: (1)

Rich, with all due respect, you had different goals for your single conversion verses your BNR setup. If you were after similar goals, the only difference would be the cost of the single kit verses the BNR's as you'll need pretty much the same pieces to support either setup. If you look at a T04Z Turbo kit, the price difference is much less.

GoodfellaFD3S

iTrader: (213)

Thanks Kyle. I appreciate your input, and like I said up above there's more than one way to skin a cat. People can make their own choices and learn from them, I'm just sharing my experience and opinion.

And you are correct, I upped the ante once I left the BNRs, otherwise I would have stuck with them. All in all, BNRs are a great setup for a reasonable price