Montrealer

Has anyone ever done a twin turbo setup with S5 turbos? Im wondering if this setup would work well on a 13b-RE.

From what I could digg up the exhaust A/R might be a little on the large side. But lagg isnt much of a concern.

Thoughts, impressions, comments, predictions?

RETed

Turbos are too big for a twin set-up unless we're talking drag, BP, or PP application?


-Ted

RacerXtreme7

iTrader: (2)

Been done, search...............

~Mike................

Montrealer

I did seach, nothing came up that was relevant.

astrochild7

iTrader: (3)

my thought was it might yield some power if> use high compression rotors.. full bridgeport or beyond.... high rpm.... I think a S4 might be better, with a upgraded cold side... weld the wastegate shut and run one/2 wastgates via the mani...

ultradef

Why not run turbos that can actually run higher than 12 psi? They basically blow nothing but hot air above that. And as stated above, they'll lag like crazy.

RacerXtreme7

iTrader: (2)

"I did seach, nothing came up that was relevant."

Heres my relevant search results that came up withen seconds. I'm sure if you search even more or used different key words you'd have more results.

https://www.rx7club.com/showthread.p...ght=twin+turbo

https://www.rx7club.com/attachment.p...chmentid=31288

https://www.rx7club.com/showthread.p...ght=twin+turbo


~Mike..............

bobybeach

I spock to one of the dyson's (maybe craig) when they were here in Auckland NZ for the rotory nationals about the twin stock turbo setup. they had a small artical on it in the fast fours magazine.
anyway It was one of there apprentice's cars and i think it out performed customers TA45 single set up that it was fetured with ( the two cars were featured together from memory). anyway i think craig said it was laggy untill 31/2-4000rpm and then pulled strong all the way through to red line. but he did say there was nothing cheap about the setup only the price of the two turbos were cheap. 380rwkw to from memory and 9 or 10sec 1/4ml

Montrealer

Thanks for the info guys.


bobybeach, do you remember wich issue contained the article?
Was that with the S4 or the S5 turbos?

bobybeach

yes i have a copy of it in my collection. ill have to dig it out and get back to you

Montrealer

I found this article on the fast fours website here's the info in case others are interested.

Steven Cockerill’s S1 RX-7
Like Jason, Steven wanted a mega quick street rotary and working at Dyson Rotary as a mechanic has been an added bonus. It also provided the opportunity to experiment a bit a under the bonnet. Instead of the usual big single turbo, the guys decided they’d give a twin turbo setup a go; the type of thing you’d expect to see on a three-rotor engine.
Two series IV turbochargers were given the nod, although a bit tricky to initially setup. So the guys got it all working using a custom-made exhaust manifold with the help of a Turbosmart external 45mm waste gate to control boost pressure.
A Mick’s Metal Craft custom intercooler cools the intake charge into the standard Series IV intake manifold. The Series IV engine was pulled down for a freshen up with additional dowels and a turbo port job being the only modifications.

The new twin turbo setup worked better than expected with the RX-7 making peak power of 367kW at the wheels on 19psi boost. To stop the motor from starving to death, Steven fitted two Bosch Motorsport fuel pumps, a Dyson Rotary surge tank and a Malpassi fuel regulator which feeds the two Rochester injectors and two massive Indy Blue secondary injectors. Fuel mapping and ignition is controlled with a MicroTech LTX8. The twin turbo setup emits quite an unusual bark through the three-inch exhaust and gives the impression that the engine is running very lazy, but numbers don’t lie with Steven recording a 10.8 @ 131.9mph on 15psi and with some niggling clutch gremlins.



Link
http://www.fastfoursvip.com/articles...e.aspx?view=35