BOTTLEFED

iTrader: (1)

like I said, similar but not the same

nuff said.

PBK7

ok,
I'm currently in contact with Sean of a-spec, but does anyone have suggestions for a a set up that would yield good mid range power?

dubulup

see sig

here is a chart (not mine)

note the table top toque curve

PBK7

which kit?

Xeros

gt40r is probabyl a good one for you. TO4S R or even Z...Z might be a bit too much tough

Xeros

Also depends on how you want to make that power. Bigger turbo less boost or smaller turbo more boost plus methenol injection or race gas type of stuff or water injection.

dubulup

when you talk to Sean...ask about the GT3574 (you will be shocked at the price)

Xeros

Isnt that the single ball bearing one?

PBK7

bigger turbo, low boost!

dubulup

no, it has a bigger turbine wheel than the ball bearing version.
bigger turbo, more weight!

bigger turbo, more lag!

...but it's your choice it you want to lug around extra weight at the expensive of spool time.

Xeros

Ah but with the bigger turbo he also has the choice of turnin up the boost to 20+ and gettin some real nice numbers out of it given he has the supporting mods. Plus lag as peopel said before it aint that big of a deal if you know how to stay in the powerband.

hus

The argument of "Single vs. Twins" is about as fruitful as what catback to run...they all have their differences but it comes down to personal goals and personal preference.

I had a chance to meet Rich (Goodfellas) at DGRR 2007 and sit down and eat dinner with him and some other guys and listen to a lengthy discussion about the BNR Stage 3s. I have to say that I'm pretty much sold on going that route.

I've listened to Stephen (SPOautos) quiet a bit over the past year or so and I consider him to be knowledgeable in the area of turbo setups for the FD and I would say that he "prefers" a good twins setup as well. But it's just a personal belief system in something that has worked well for these individuals. An FD can blow with both setups.

Anyway, I think you need to set your goals to fit your driving style. There will be guys that say bigger is the way to go because of the options of more and more power without having to change the turbo setup again. Then there will be guys that say you can't beat the spool up and drivability of the twins with good solid rwhp.

Again, it's all about goals and preference. Obviously there are good enough arguments for both sides because BNR, M2 and others are still selling twins and Garrett, Greddy and HKS are still selling singles.

If one caused WAY more problems than the other then I would say there would be a need for great debate. The reason there are so many threads about it isn't because no one can give a good or "correct" answer, it's because there is no "correct" answer. PREFERENCE.

Brad

gmogle

Can I ask a really stupid question.....do you set the aftermarket twins like BNR sequentially or non sequentially ? Or can you do either ?

NissanConvert

iTrader: (1)

You can do either, but should specify at purchase time which one you want and they'll set them up for you. IIRC the bnr's will spool just a second slower but have a lot more midrange and top end. 400whp in a car 300lbs lighter than a corvette (stock) isn't anything to scoff at.

rynberg

The spool up is nearly the same. You do not get a lot more midrange and top end, you get more power all around above 13 psi or so. I'll repeat that the BNRs don't really make much more power than stock twins until you start hitting the limit of the stock twins (>13 psi). The BNRs will theoretically last a lot longer at the higher boost levels too.

3rd Gen Jeremy

So what could one expect with a non-ported engine with great compression to achieve with the BNRs in sequential setup? I've got everything anyone could want under the hood as far as a track car goes. Fuel, IC, Ignition hard pipes, efini y-pipe and on and on. The only thing holding me back is my '99 spec set of twins. They're great don't get me wrong, but I'm maxed at 331 whp at 15psi. That's not bad, but I want at least 400. What's the most I could hope for? What' the most likely outcome?

I will have Steve Kan retune once I get them. What's the highest efficient boost they can run at?

gracer7-rx7

iTrader: (16)

Jeremy - You'll probably need a ported motor or a different turbo setup or both. The turbos are only part of your limitation.

My car dyno'ed 350+ RWHP with a street port and 99 twins at 15 PSI using 93 Octane gas running sequentially.

Rynberg made some good numbers with the BNRs sequentially with what is probably a smaller street port than I have.

For comparison purposes, a friend of mine with a stock block and a T04 made high 300, low 400 at ~15 PSI. Look for a dyno sheet from r1dreamer.


hus has the best advice on this thread!!


This isn't directed at anyone in particular, but I personally don't understand statements about making "at least XXX amount of HP". Its kinda like bragging about how big one's **** is. The only thing that matters is how you use it.

rynberg

You can't run the 99s any higher than the stock twins. 15 psi is the practical limit, and is also nearing the safe limit on pump gas (without WI). You are maxed out on a stock motor and a safe tune, IMO.

For comparison purposes, I made 330 rwhp at 12 psi with the BNR Stage 3s, streetported motor, and safe tune for 91 octane.

GoodfellaFD3S

iTrader: (213)

For comparison's sake, I made 350 rwhp on a dynojet at 12 psi with my non-seq BNRs.

I'd say 400 rwhp seq is possible, but I don't believe it's been done. On stock ports it ain't happenin'.

3rd Gen Jeremy

Yeah I made 331 at 15 psi on a dynapack. I was just wondering what kind of horsepower to expect at 15 psi with the same setup + the BNRs. From what I'm hearing it's about 350 - 375. I was planning on leaving my motor alone because I don't want to pay for a complete rebuild plus porting. It was just rebuilt about 7k miles ago anyway.

By the way, I'm looking for 400 whp to get into the low 11s and still have a trackable car not so much to brag about my ****.

PBK7

Just an update ...i'm going with the XS engineering To4s

RotaryDreamz

iTrader: (29)

I made 330 whp at 14 psi on a stock ported motor with 91 octane.

If you are aiming for more horespower than what you have already, then you are going to need to port your motor no matter what. You are also going to need to use race gas to support it.

If you don't have all the supporting mods to withstand the horespower you wish to make, then it ain't gonna happen.

3rd Gen Jeremy

Like I said before, I've got all the under the hood goodies.

1680 top feed injectors,
850 primaries,
SS fuel lines,
Aeromotive FPR,
Walbro 255 lph fp,
new fuel filter,
Apexi PFC (tuned by Steve Kan),
HKS Twin Power,
New NGK 9's all around,
new NgK plug wires,
K&N intakes with hard piping,
Greddy Profec B Spec II,
'99 spec Efini twins,
Efini Y-pipe,
PFS Medium IC with duct,
Greddy Elbow with Hard Pipes,
Fluidyne Radiator,
DP, MP, Cat Back,
dual oil coolers,
Pettit Launch Kit,
Koni Yellows,
Eiback ProKit Springs,
some other goodies I can't remember

That should just about get it.

From what I understand, the BNRs push more air at lower PSI so I won't have to use race gas. Please correct me if I'm wrong. Has anybody run the BNRs on stock ports with 93 octane at 15 psi? If so, what numbers did they make on what dyno?

rynberg

You aren't listening. You can have all those mods, but you aren't going to hit 400 rwhp with a stock ported motor on twins. Even if you got BNRs, ran race gas and hit 18-19 psi, you would probably still be in the 375-380 rwhp range. You might be able to do it with rich-man's non-sequential but not sequential.

3rd Gen Jeremy

Ah hah! I knew I'd get you to answer my question sooner or later. I knew that I couldn't get 400 without a ported motor. I was just wondering what I could get without a ported motor.

Thanks for your info rynberg, although it was given reluctantly.

My next question is why couldn't you do it sequentially, because the flapper is in the way? Other than that, they're both spooled either way, what's the difference?

Jeremy