BNR Stage 3 Turbo Upgrade 93+ RX-7 or Efini Twin Turbos
 

BNR Stage 3 Turbo Upgrade 93+ RX-7 $2,350.00
http://www.rx7store.net/v/vspfiles/p...203%20FD-2.jpg
Efini Twin Turbos $2,595.00
http://www.rx7store.net/v/vspfiles/p...20Turbos-2.jpg


did any one installed one of this on there rx7
what kinda boost r they capable of

any detailed info would be appreciated

there is no comparison between the 2 the BNR's are far superior and can handle much higher boost. Do more research and you would have found your answer.

supposedly i read the BNR turbos are better than having a set of efini twin turbo. yielding higher boost than efini turbos. but its up to you i suppose... good luck!

I suggest a GT35R with a .82 AR turbine and short manifold if you need to pass emmissions testing. No emmissins, go T4 long manifold. More power, fast spooling, less weight and less heat.

if you want to stay twin sequential, I highly recommend the BNRs. The efinis barely do more than stock turbos and I doubt you could notice the difference. I made 7 more hp on the dyno with the BNRs vs a car with the same setup on the stockers. It's a no-brainer.

I'll be moving to the single shortly though and cewrx7r1 has a valid point.

BNR's are the only choice. Why anyone would buy efini turbo's at that cost when the BNR's are available is beyond me. I run mine at 17 pounds all day at the track and the street. Bryan says they are efficient until 18 pounds and reliable up to 22 pounds.

thewird

that's nothing to boast about....I need to strap my car to a dyno, but I'm pretty sure I have at least 30 hp on the stockers at the same boost level, and I'm running the old Stage 2s

btw this topic has been rehashed at least 500 times

I'm assuming he meant 70. Because... yea...

If you need to pass emissions going single turbo is pointless cause you would need to upgrade your fuel system and that would required you to get rid of most emissions equipment. Around where I live they are cracking down on most shops so paying someone off is damn near impossible.

Do you happen to know how much power your making and what dyno type?

-Chance

330 on a Mustang dyno with a VERY conservative street port. I'm getting my engine re-ported as we speak with a better street port which my mechanic says will take it to 370-380 at the same PSi level. This is still a conservative porting job in the sense of peak power since I care more about powerband then peak power. Ask me again by the end of next week and I'll have some dyno graphs from all 3 dyno's with the new engine which will also have NRS ceramic seals :).

thewird

Great look forward to seeing the results.

What do you have for a catalytic converter?
Oh yes nice rnew rotor housings!!

What's a catalytic converter lol :scratch: . I don't use them things, they only last 6 months in my car and even less now with my tracking. Yes, I bought new housings which made the ceramic seal decision that much easier since you need perfect housings to use them.

thewird

So let me get this right.... With BNR's and a streetport you made 330@17lbs? Why does this not sound right to me... I made 320@12lbs on stock ports and stock turbos...

Chris

If you're running a sequential system through the stock manifold, no turbos are going to be a huge difference either way as far as peak HP... BNR's or otherwise. Most of the big numbers you've seen from them are non-sequential. I've not heard of them making much more than '99's sequentially.

The '99's aren't designed to make big peak power increases, because with the stock mani and sequential system, you won't get it anyway. They are meant to spool quickly, and make good torque, and I can attest that they DO do that.

Because the internet produces funny numbers. Unless you go to the same dyno shop to compare numbers, its all meaningless. My car pulls on a single turbo GT35R that run 14 pounds and has 375 HP on another dyno. Also, it depends on the street port. Not all street ports are the same. You can get a high peak number but your average horsepower over your powerband isn't that great.

I tune my own car, I'm pushing it to the edge, I even pushed it so far that I made eventually give way. I think subconsciously I wanted to blow it up to find the limit but anyway... I spend a lot of time on the dyno (Mustang) and know it would not give more then 330 on THAT dyno no matter what I did, without blowing it up that is.

Anyway, that's why when I finish tuning this new engine, I'm going to compare between the 3 different dyno shops (Mustang, Dynojet, Dynopack) I have available locally so I can post the differences. Also, this might not even be a fair comparison because the Dyno owner I go to showed just how easy it is to change the numbers the dyno gives. So what might show on one Dynojet, might not show on another Dynojet etc.

Most of the benifit of the BNR's comes from running higher boost since the twins aren't efficient past 14 PSi (or very reliable if your beating on them). Running non-sequential can have at most a 5-10% difference in HP. And yes, I'm still running sequential. If your gonna get BNR's and run them non-sequential I really don't see a point. Might as well get a small single like the GT35R or similiar.

thewird

How do you make 320 @ 12psi on stock ports and stock turbos?

THAT doesnt sound right.

You need a good tuner. LIke Steven Kan

Stock port, stock twins at 12 psi and 91 octane California pisswater I made 311 at the wheels with 264 ft lbs of torque.

First of all fuel has nothing to do with power. Octane is octane. 91 Octane is fine until 14-15 PSi. I'm not even gonna comment on those power numbers, theres just no point lol.

thewird

BNR Stage 3 turbo is the way to go and yes i am going to keep them sequential...ok so now the question is whats the most hp i can get out of it ......

BNR Stage 3 turbo 18psi
new map sensor stock don't read past 15 psi
street port
3mm apex
FC commander
1600cc injectors
msd ignition
walbro fuel pump ,fuel pressure regulator, fuel rail
v mount intercooler
3" exhaust no cat
compression tube

thats my recipe, what u think ???what kinda hp m i looking at???

What fuel you going to use with that? 18 PSi is too high for pump even if your lucky enough to have Sunoco 94. Stock map sensor doesn't read past 17 PSi but when your getting close to that, you should get a GM 3 bar map sensor. If your using 91 octane, I wouldn't run over 15 PSi. You can push it to 16 PSi but you would have to run rich for safety. This is of course if you don't want to blow your motor.

Also, I'd get a Denso fuel pump instead of a Walbro, they aren't much more. You can get it for a reasonable price on eBay new HERE which is where I got my pump.

thewird

where does the A-spec 500r fit in with these turbos?...or is this not an apples to apples comparison?. I thought I read that this turbo spools quick and delivers good power. Not sure about the price comparison.

i run 93 octane u realy not supostu use anything less especially now that a lot of gas is f water...

and map sensor is not acuret pas 15psi u can push it ,not good tho....and i run rich all the time

idk what to use any more all this talk is making me go nut is there any thing like perfect setup.....see i f@$#%^* hate turbo lag u know

thats y am lining to sequential BNR

but i all ready got a T66 single i think it be lil too much for a street car and stock transmision and rear end

My bad, I misspoke. I've got the Efini twins and I meant to say that I only made 7 more hp than the stockers so they were a waste of money and I should have gotten the BNRs.