Single twin best

[DougTaylor]

I've decided to replace my -5 setup with a BW EFR 7670. I've already got a top mount single manifold with WG but the EFR can come with an internal WG and recirc BOV. The EFR that comes without an internal WG only has a 1.05 a/r, while the ones with an internal WG have .83 or .92 a/r. So, I have a couple of questions - any comments on the different a/r's vs spool rates with the EFR, any comments internal vs external WG, and does anyone know if any dynos of the 7670 on the rb26?

Thanks

[NismoS-tune]

You know what i have to be honist about how these parts came about. We started Super_Dudes V1 build with this setup plus the Cosworth ported head, Nur bottom end, CF driveshaft +++++. We got talking one night and he mentioned to me that he was going to run the twins then go single in a year. So I told him it would be far cheeper for my labour to go single now due to the amount of work overlap and paying for the work twice. So we found the GT4088R setup from a GTRC member and bought it. The setup worked alright even though I wasnt to happy with the compnents we still made 587whp on pump. Anyways the -5/Tomie combo was left all NIB i took that as partial payment. The combo of items was desided after many conversations with Eric Hsu and XS Engineering. Im sure Super_Dude could expand on that.
Now the car is going RB30 and EFR turbo so there will be a FS thread comng in the next few weeks. We will keep you all posted.

So really, he paid for some kind of work more than once. What's your rates like? $150/hr? $200? eek expensive.

Which EFR turbo? 91mm? 1000hp? Cause I'd hope it'd be better than the previous 600+hp one.

[Speeddm]

You know what i have to be honist about how these parts came about. We started Super_Dudes V1 build with this setup plus the Cosworth ported head, Nur bottom end, CF driveshaft +++++. We got talking one night and he mentioned to me that he was going to run the twins then go single in a year. So I told him it would be far cheeper for my labour to go single now due to the amount of work overlap and paying for the work twice. So we found the GT4088R setup from a GTRC member and bought it. The setup worked alright even though I wasnt to happy with the compnents we still made 587whp on pump. Anyways the -5/Tomie combo was left all NIB i took that as partial payment. The combo of items was desided after many conversations with Eric Hsu and XS Engineering. Im sure Super_Dude could expand on that.

Now the car is going RB30 and EFR turbo so there will be a FS thread comng in the next few weeks. We will keep you all posted.

[bellis_GTR]

Thanks for the info. They look great man. Can I ask why you choose the non divided outlet? Is there any gains with a divided outlet? I know it gives an awesome sound when the wastegate opens but thats all I know lol...

[Speeddm]

Yup Tomie and -5 combo ceramic coated. Not to mention my own custom Copper gaskets. The down pipe was left over from Super-Dudes first build I did back in winter 08. He would have a better idea which one that is.

[NismoS-tune]

Speeddm! Those look amazing! Can you please share details on those beautiful pieces of work!

Looks like Tomei manifolds/outlets and smallish turbos, maybe -5s? The downpipe is maybe greddy, hks or nismo? I recognize the mani/outlets as I have the upgraded version of those

[Skym]

Dragon Humper, that's how you drive a GTS-R (race version of RB20DET). Basically drop down a gear to keep revs up and engine in powerband.

[rbs14]

yeah i know over there u guyz can make CRAZY money!!! here in quebec aint like that la !!

yeah i wanna go wit that! 100% sure wich turbo kit u tell me to go wit tho

t51r or t04z

stop loving on HKS !!! there is like 3 turbo companie out here that are cheaper and more avalible that will beat the HKS

full-race manifold or 6 Boost / even a custom manifold !

- precision 6262 and up if you want 500+
- BW EFR
- Garret GTX

[Dragon Humper]

I love my T88, Carrol Shelby said it best in the '80s when the turbo 2.2 Dodges were all the rage....."if you are suffering from turbo lag then you ain't driving it right".

I have done some bansia runs on some of the windy secondary roads here in BC and I have no lag whatsoever if I keep the revs above 4500. For an old school knuckle dragger of a turbo, it stays on boil without much effort. You just have to have the balls to squeeze that throttle just a little more at the APEX because you get ALOT with only a little push. Learning to hold her back is a sure fire way to live longer.




Jon.

[NismoS-tune]

yeah i know over there u guyz can make CRAZY money!!! here in quebec aint like that la !!

yeah i wanna go wit that! 100% sure wich turbo kit u tell me to go wit tho

t51r or t04z

T51R BB SPL go the works. I built with 15k and stopped at -5s cause I couldn't afford to support a way larger size of turbo like those

[bellis_GTR]

Los of respect tot he single turbo guys. And I am VERY wel versed on the ins and outs of both setups. But I still just cant deny I love my twin set up.

Speeddm! Those look amazing! Can you please share details on those beautiful pieces of work!

[LuckyGTR]

Let's not talk about income son, people leave quebec all the time to come here and 3x their income A dump of a house costs 500k lol. Look it up, Fort M'écoeurer, alberta. An 18 year old First year welders can make 100k a year just showing up to work.

Anyways, on a positive note, if you can afford it, do it, I would if it was something I wanted. Just remember to show and tell cause it sounds pretty sick!!

yeah i know over there u guyz can make CRAZY money!!! here in quebec aint like that la !!

yeah i wanna go wit that! 100% sure wich turbo kit u tell me to go wit tho

t51r or t04z

[NismoS-tune]

Let's not talk about income son, people leave quebec all the time to come here and 3x their income A dump of a house costs 500k lol. Look it up, Fort M'écoeurer, alberta. An 18 year old First year welders can make 100k a year just showing up to work.

Anyways, on a positive note, if you can afford it, do it, I would if it was something I wanted. Just remember to show and tell cause it sounds pretty sick!!

[Skym]

I've noticed with twin turbo, single turbo, that twin turbo is alot smoother when transistioning to boost. Single turbo is alot more violent / responsive.

From what I understand, there's different types of response, transient response (how quickly engine responds after pressing throttle), engine response (how fast engine revs), boost response (turbo's spooling earlier). Smaller turbo = better boost response, transient response. Both can be measured on a Hub Dyno.

HKS have a response vs hp chart on their website -

http://www.hks-power.co.jp/products/turbo/hanyo/index.html

If want all 3, stock capacity RB26, same duration on intake, exhaust cams (260 duration), HKS 25/30 or similar turbo's. Good for 700hp at engine when pushing turbo's to the limit's. Basically copy the Mines N1 R34GTR demo car engine.

[LuckyGTR]

Peice toghter your own kit with a 6boost or a fullrace manifold and a gtxr or an efr turbo. You will get much better results in spool and horsepower.

???? show me some kit no? parts?