BNR Twin Turbos

[stylus350]

My T04Z is instant
Remember "appropriate sized single" fit the right one and you will have most of what the unreliable twins will give and a whole lot more.

Find me a single that fits my needs and I WILL make it happen. Please. I would love to simplify the complicated twins set up.

Sounds like you never had a decent single set up?

Ground up build by JayDee and Kerim. Faultles.

I\'m not anti single in fact far from it! There are times I wish my car was as quick top end as my single was but I accept that this suites me much better most of the time.

[PGiljevic]

Please excuse my posts I re read them and they do read badly :HammerIf you like your seq twins then so be it, I kind of miss mine, but for my purpose and style of driving I prefer the ones I already mentioned too many times.

I will try to find the log of the BNR\'s for peoples interest and post it.

[stylus350]

All good banter to me good things often come as a result of a good argument

[Nik da Greek]

Fair play to you Mr R. Racer, top fella for saying that. Like I said, no-one was challenging your experience and testing, just the way it came across.

Now we\'re all being nice to each other I have to say I agree with what Stylus says about the immediate driveability from twins in urban situations. I miss the urge from a whisper of throttle at stupidly low revs that twins give you, and it\'s simply not possible to always drive around at 3000+ rpm especially in traffic so you\'re never getting response from a single. Besides, 3000 rpm in second on my car now probably busts any urban speed limit wide open! In my opinion in every other respect single trumps twins, and I was a staunch and vociferous supporter of twins as long as I possibly could be.

I certainly don\'t miss the frailty and complexity of them, though. All the time I\'ve had twin turbo FDs the percentage of time they were working glitch free is probably like 33%. The other two thirds of the time they\'ve either been misbehaving, outright failing or I\'ve been waiting for the next glitch to appear. An eighteen year old car with a hundred miles of cooked cracked vacc hose and twenty roasted vibrated broken solenoids does not make a recipie for reliabilty sadly

None of which adresses the real advantage of a single, the mad anarchic headrush and inexorabilty of it hoovering up the horizon on boost. As far as I\'m concerned, nothing comes close to that and I can\'t imagine ever wanting to go back to twins, even uprated ones. Of course, this is purely my own personal preference, I wouldn\'t try to state anything I say is definitive or objectively proven , just the way it makes me feel.....and that\'s the only thing that\'s really relevant to a road car after all. Lap times and absloutes matter little when you\'re pottering along behind myopic Mrs Miggins on her way to take Tricky-Woo to the vets at 15mph, what you want is a car that drives off no revs without breaking your clutch leg and juddering about or bogging down like a spaz all the time

[probedb]

I\'m another pro-twins person even if that is all I\'ve driven. I very rarely get to push over 3k around here so a single is pointless. If I did push it that hard I\'d have lost my license a long time ago

It entirely depends on how and where you use your car the most. For me having a single is entirely pointless.

Feed Chick\'s car is a Feed mapped twin with no bump in the power band.

[a.tapos]

I love a well tweaked single as a track weapon
I love a twin (new vac hoses and downpipe) as a fast daily squirt
HATE Petrol pumps

[dudsey]

In my tests:

Both std 13B-REW\'s
Both Blitz SBC I color boost control
Both same SMB exhaust systems
Both HKS DLI ign
Both tuned the same
Both same test location

I drove the twins car on track and had to rape it to get a lap time of what I would get out of a single turbo car (narrow power band) poor low end power, very poor top end power. And the turbo\'s broke :Thumbsup!

If people want the "reverse park 15psi boost" then stay twins, if you want a real car go single, it will be faster, much more fun, quicker in every situation in my experience and cost you much less :Typing

Did you upgrade your solenoids? It doesn\'t seem like you did, so you cannot compare a single setup to the BNR\'s/RF420\'s, let alone a t04z! :chat

However I would stay twins if you have lots of urban/odd B road blast, but single if you live in the country/big city.

[Macer]

I notice that Revolution now sell uprated twins:

http://revo-tune.jp/catalogue/detail.php?id=211

I don\'t know anything about them, or how they compare to BNRs/RF420s - does anyone else have any details on them? Are they a better alternative, or much the same?

[PGiljevic]

Did you upgrade your solenoids? It doesn\'t seem like you did, so you cannot compare a single setup to the BNR\'s/RF420\'s, let alone a t04z! :chat

However I would stay twins if you have lots of urban/odd B road blast, but single if you live in the country/big city.

You wanted me to upgrade the Blitz dual solenoids which control the boost :rollin

The turbo\'s were fitted with upgraded base springs & had the same boost controller running them as well

The twins were not great, never have been in any I have trialed for good reasons I think I stated already, either way it\'s up to the individuals I suppose, I know I would never ever entertain using any type of twins nor recommending them to any customer no matter how much they love them or the idea of it. Any such romance is dispatched once I take them for a drive in my own personal car :driving you just cant compare a good turbo set up to the plethora of twins around as stated.

1.3 kg/cm =　　425.4hp　トルク　46.5k LOL at their power claims

:3gears-lh

[BenLewisMav]

Quality thread :Thumbsup!  With actual facts and figures and everything :mmmm

Also don\'t know if its worth mentioning but T04z is pretty old turbo tech...

[skybusr34]

interesting read.

i have had 4 fd3s in various hp and turbos. and im currently hunting down my next rex..  what will it be?  a 500hp single? a 400hp twin?

nope..... a 330hp 99 spec twin... why.. the 99 spec cars had a much better sequencial system, better turbos.   and nothing imo beats the twin rex.

yes a 500hp rex will kick its ar5e from 4500rpm. but i want a comfortable sports car that i can drive through town traffic in without lookin a tool reving the arse off the car..

prime example is the honda vtec boys. when you hear one of them blatting up the high street. most people thing bell end. but the poor guy his just tryin to get to the power band. same as the big singles.

im rambling so i`ll sit in the corner now :-)

[PGiljevic]

interesting read.

i have had 4 fd3s in various hp and turbos. and im currently hunting down my next rex..  what will it be?  a 500hp single? a 400hp twin?

nope..... a 330hp 99 spec twin... why.. the 99 spec cars had a much better sequencial system, better turbos.   and nothing imo beats the twin rex.

yes a 500hp rex will kick its ar5e from 4500rpm. but i want a comfortable sports car that i can drive through town traffic in without lookin a tool reving the arse off the car..

prime example is the honda vtec boys. when you hear one of them blatting up the high street. most people thing bell end. but the poor guy his just tryin to get to the power band. same as the big singles.

im rambling so i`ll sit in the corner now :-)

I think I will need to post up actual power curves :Santa

The single turbo car actually has a far wider power band, it only starts marginally later *makes no real difference honestly* but makes more torque and power from 4000rpm to 8500rpm. Ironically the twins are the narrowest power range of any turbos I have used and are the least drivable on track and even on spirited drives in the mountains :2Confused They have a sweet spot at 6500rpm (still 10% less on all same variables than a single turbo) and everything below this and above is greatly less than a single turbo 20% less power.

If you talk about transient response (on off throttle and between gear changes) the single turbo destroys the twins (sequential or not) it is a massive difference! as the twins CANNOT harness the rotary engines pulsing which is divided in a single turbo instillation and mixed in any twins set up, The level of choking on the engine with twins is far higher so you always end up with more heat, higher stress, lower power, worse response, poor turbo reliability at high power.

These are all reasons why I and most others moved on from the OEM twins based set ups, the amount of mid range power, response and reliability from a single turbo cant be beat.

:3gears-rh

You will see every in gear power band test here > http://www.riceracing.com.au/vbox-iii-testing-tuning.htm
The performance of a single v\'s any twins is on another planet, its easily available and much more drivable than twins set ups, while you are standing on the gas in your twins trying to convince yourself of how superior your "low down power is" the single turbo car have beaten you by a massive margin! and this is just from standing on the gas in the same gear at low rpm

If you can afford it go single turbo, its a much much better choice.

[skybusr34]

been on your site and must say i`ve struggled to go anywhere bar the top left of the screen in the link you just posted..