sdelong2

iTrader: (5)

Now before anyone comes in and says thats stupid/retarted/etc, I am looking for actual reasoning behind responses and real world experience(IE "I ran xyz setup with stock twins with hbp and then divided by zero and the world imploded on itself!"). I am very curious as to how this would turn out. My guess is itll end up choking up top but who knows?

Have/Planned/Idea's
A. Picked up a set of BNRs for the cheap
B. "Old" not recommended fuel set up 850 pri/1600 sec
3. PowerFC
D. Custom V-Mount + Proper ducting
5. RB Dual tip exhaust
6. Winning?
G. Your idea/thoughts

Either noone shared their experience on here while doing this, everyone decided this was probably a bad idea and didn't try it or I just suck at searching.

Anyways, thanks in advance for provided responses.

Stay frosty!

Supernaut

iTrader: (83)

I've spoken to many people about this with a semi pp. The general consensus was that the turbos would run out of room at higher rpms but the turbos would probably be able to handle the action and not cause a black hole when it goes supernova.

If I were you, I would NOT go used on something like this. Besides, the newer BNRs are supposed to produce more power!

sdelong2

iTrader: (5)

Not too sure if I have the newer BNRs. The used BNRs came off a running car with no issues, picked them up from a local guy because he went with a GT35R and bridgeport.

I figured as much that these would run out of breath at the higher rpms due to the exhaust housings. If I were to venture down this path I would not make extremely large bridges either.

Thanks for the response Supernaut!
-Steve

Captain_Panic

iTrader: (15)

Having a more restrictive exhaust like the RB duals, etc would probably help this, but then again, if you are going to choke the abilitity for a PP or HBP to breathe.... then why do it period. I have heard an aggressive Street Port is the way to go on BNRs with AI for max power.

As you saw in my other thread (i assume) stock ports and no AI don't allow for all the spooling these can provide over stock.

GoodfellaFD3S

iTrader: (213)

^that wasn't proven in your other thread. Dyno numbers are just that, numbers..... and one car does not make for a hard and fast rule IMO, especially when BNRs aren't exactly new on the scene

Captain_Panic

iTrader: (15)

Good point. Wasn't proven... in fact nothing has been proven as of yet. I will try to figure this out though....

fendamonky

iTrader: (6)

My (personal) opinion is that twins should be kept in fully sequential form, with stock ports. The idea behind twins is to have IMMEDIATE response and power/torque through out the RPM range. Going non-sequential will simplify things, and it might net you an extra 10-15hp, but you'll be getting that at the expense of the IMMEDIATE reaction time sequentials offer.

If you want a simplified engine bay, higher peak power and more linear delivery than just do it right (the first time) and go single.

As for porting, it is my understanding that the more you port your engine the more your powerband is pushed to the right. You might (most likely will) get a higher peak power, but you'll be losing out on a large(r) percentage of your useable powerband. Max power in the last 1,000rpms might be fine and dandy for a dyno queen or single purpose drag car but its kinda wasted on the street.

FD's are meant to be driven on the street, ripping through the curves and loving every second of it! If you are only interested in straight line power or high speed highway pulls than there are MUCH better cars out there for it.


My personal opinion is that twins should be sequential (get an upgraded solenoid rack and kiss those worries goodbye) and run on a streetport (or smaller) with a good water/meth injection system in place.

If you want to do bridge/half-bridge porting than do it for a specific purpose (dedicated drag car) with a turbo that is sized for that specific application. It seems to me that if your porting is too big for your turbo(s) than you'll be getting the worst of both worlds... Your turbo will be overwhelmed before you get into the portings efficiency range and it will be a lose/lose situation (when your turbos are happy your porting isn't being fully utilized, when your porting is being fully utilized your turbos will be crapping themselves).


But that's just my opinion, what do I know =P