single turbos as responsive as twin turbos

[WickedCAS]

I have not done this, but from what I understand of turbo design you're always trading off peak airflow with responsiveness. A well chosen single can be as responsive as twins that can flow the same air, but if you want to get the best of both worlds you need to get a bit fancier.
Read up on twin scroll technology. You'd need the right exhaust manifold to take advantage of this, but you could expect better response than from a constant pressure system.

I am new to this forum but, I wanted to touch base on above comment.
Twin scroll set up with Twin wastegates is the ultimate setup you can get for these cars.
Check out the manifold we have here, not trying to solicit just showing and sharing some info...

http://www.wickedcas.com/product.php?productid=149&cat=36&page=1

[gtrjon]

twin gates arent any more effective vs a single gate as long as the manifold is a true twin scroll. which can still be possible with a single gate as long as both chambers are fed into a single gate

[mikey]

What is your setup cobraa? My brother is running 2860 -5's and he's making 430hp atw at 20ish psi (extremely safe tune). I'm running a single pt67 (t04z) on mine, we haven't finished tuning yet because of fueling problems but we got to 5k rpm and it made 250atw with 12psi. it starts spooling at 3k and was making 100hp per 1k rpm thereafter, simple math says that 21psi plus 2k additional rpm's should see 550ish atw's on a good tune.

let me know what your setup is and I'll ask my brother what he thinks he'd be able to do with it.

[WickedCAS]

twin gates arent any more effective vs a single gate as long as the manifold is a true twin scroll. which can still be possible with a single gate as long as both chambers are fed into a single gate

Such as the picture below... But twin gates can control the boost better by more flow, (not as restricted) reducing the chance of boost creep.

[hozer]

Every result for the new borg warner EFR's make pretty amazing response/spool results.

The 9180 on the hi octane r34 made 70 KW's ATW over there -10 setup on a rb30 in the midrange. They are considering swapping the old rb26 r32 over to the 9180.

http://forums.evolutionm.net/evo-dyno-tuning-results/573459-borgwarner-twin-scroll-7670-dyno-graph-2.html

Scroll down to post 22 for some entertaining comparisons. Keep in mind that that is at 30psi. That is not very high boost on a 4g63.

I think a efr8374 would be the ultimate 700-800whp setup. (I might be biased, I've been waiting to put mine on for a few months)

Will it be as responsive as a GT-SS, maybe. Nobody has really posted results for a rb26 with an efr8374.

Waiting on mine too. But from previous experience my old single borg turbo drove really well, on a track it drives simillar to twins, just have to keep it boosting. Obviously slower spool from a stand still though

[Super_Dude]

I've got mine, just don't have a complete engine to put it on

[gtrjon]

the efr is the coolest thing since sliced bread right now. dont get me wrong tho its just the wait times are months on end and i have never actually seen a single car in person running them. the only cars i even hear about are from borg warner themselves. any body checked out pte? they are making some pretty nice snail shells these days. the prices is pretty close to the efr 1500-2k dual bb but the spool time is amazing and so is the power. my buddy just picked up a pte 5857 dual ball bearing. it was close to 1600 out the door but he swapped it onto his built sr20. he replaced a holset hx35 which he used that and made 460rwhp @25psi. when he threw the pte 5857 with nothing else changed made 525rwhp @ 28psi. with his spool time dropping by 300rpm. just something to think about!

[newalliance123]

BW for sure. Im STILL waiting on my 8374 but will run it internally gated with a 6boost non gated manifold. Hopefully its a decent compromise of both power and response.

[Super_Dude]

All these people waiting on 8374's and mine's sitting on a shelf waiting for an engine. Hmmm... maybe sell it for a "small" profit. jk

[newalliance123]

Haha I would seriously be tempted. I'm going to get theboys at full-race drunk at sema and take one off their display im thinking...

[hozer]

All these people waiting on 8374's and mine's sitting on a shelf waiting for an engine. Hmmm... maybe sell it for a "small" profit. jk

I would lol, if I had known this sooner I'd have shot you an offer myself.

[cobrAA]

I would expect more from the engine you describe at that boost.
You'll make more power by turning up the boost, but I really think you can add substantial power by optimizing what you've got.
Are your cams correctly degreed?
d

Heck, I'm no mechanic. I can't tell you. I paid 2 machinist to do all the work on the engine and a mechanic to put the engine back in the car. I hope they are.

The problem I have is there's, to my knowledge, 2 good tuner in QC for nissan; First one did a bad tune and was expensive. second one did a good tune but didn't want to tune the water-meth-cam gears to get the most out of the actual setup.

#2 problem: I only know one guy in QC who can do porting ( maybe there's more, probably) but i've never seen actual true before/after dynosheet. I know one guy who got it done on his twin built. his number were exactly the same as mine with my twin setup so... is it worth it ? 1. it's not worth it at 500whp or he didn't do a good porting job.

[gtrjon]

porting is not the solution! tons of motors are making huge power with stock ports. porting is not all its cracked up to be imo. if it was as great as they say it is then there would be difinite dyno sheets all over the place. its really not that hard to show what you get for your 2k. tune before post dyno sheet. yank head off port it tune again post dyno sheet. what you need is a tuner. a tune is the most important part of your build without a good tune you should of left your car stock because your just wasting your money. go as far as you need to go to get a good tune with a competent tuner you wont regret it.

[GTR-Dad]

Heck, I'm no mechanic. I can't tell you. I paid 2 machinist to do all the work on the engine and a mechanic to put the engine back in the car. I hope they are.

Don't feel bad. If it was easy everyone would be making 500+ Hp at 18psi. Half the fun is learning what matters and getting the most from your setup.
Cam timing netted me over 100 HP. Pretty cheap mod. Everything else was great, but that detail was waaaay off.
GL
Dan

[cobrAA]

Impressive! Might make a new thread and see who are the beast tuner in ontario.