Xr6 Twinturbo!

[JP300]

you're right john, I should just go and have a chat to the boys at GCG or somewhere like that, the Garrett catalogue does have pretty good info on it though.

I agree with the twin turbo set-up - ever seen the Mines GTR in action around a track, that car is insane! - it should be nice and streetable, as long as I don't go too extreme with turbo size.

Hoping to start the build sometime early next year, it's just getting the time and space to do it first!

I used to do circuit days with my R32 ... I had a set of RIMs with full Pirelli race slicks. Once they warmed up it was amazing around a track.

Pat, just go for it ...

I would be very interested to hear how you progress.

Hey Brian, Good to see you in the forum ...

I think that low down torque is great and the more the better. However there is a very narrow window in throttle movement to frying the tyres when they are cold or when it is wet.

Even in the dry, it does make it a challenging drive and like you say the car can always be detuned if it is too much.

The fun is trying to keep the car straight when it breaks traction and then feathering the throttle to keep it accelerating ...

Edited 18/11/07 01:16 AM by Dagabond

[2MUCHKW]

are you laughing about the idea, or the turbo choice? As I said earlier, this car will not be made to find the limits of a twin turbo set-up, it will be done as an engineering excercise I guess you could say...

I don't mind if people think its a silly idea, if I cared about ppl nay-saying I wouldn't have posted it on a forum. And by the way, do you ask everyone how much money they have? it doesn't matter what my budget is, I asked for ppls thoughts on the turbo set-up, not whether or not you think I can afford it - so pull your head in unless you have something constructive to say...

Dont stress bloke,

Its a great project but the outcome will unfortunatley be your budget!

You will be pioneering n pioneering is never cheap!

To get the best possible result and not a backyard nightmare you'll require expensive expert advise, expensive high quality workmanship well designed tuned lenght manifolds and associated mandrel bent plumbing, expensive new correct sized turbo's and lots of expensive dyno tuning and R&D time to get the setup optimized.

So doing it properly wont be cheap and the end result will determined by your budget

I say go for it despite the cost ...

[senna_T]

that's fair enough, as I said in the original post, I have some good connections in relation to the labour side of things, so this will save me alot of money, I know it will still cost a bit, but I really don't think it will be as bad as alot of people think, the engine management shouldn't be that hard to sort out, as the turbos will not be a sequential set-up

Only time will tell...

[2MUCHKW]

Good to hear you have connections!

Maybe chat to Nizpro for they seem to be doing allot of development work with quad turbo engines at present in ski boat applications as shown in the cut and paste post from their website below.

"So whats next? At present, development of a new generation 6.0 litre DOHC 32 valve quad turbo engine designated the VZR 6 is underway at Nizpro Turbocharging. Nizpro has been very involved with Ian Kilpatrick’s Boat ORSOM from the onset and firmly believes this new engine could do to ski racing what God’s Gift did well over a decade ago. Being fitted with a dual stage quad turbo set up, this engine is able to produce over 800 ft lbs of torque at a low 2000rpm with a capped figure of 1150 ft lbs and a maximum rpm limit of 8500. This then gives a hugh rpm spread of usable power and torque, thus allowing the use of lower gear reduction than what is commonly used with the BB boats, further increasing torque at the prop. With its all alloy design, the engines lower overall weight and centre of gravity not only could change engine thinking but also boat set up.

This new engine design will hit the water in early 2008, built in Bayswater Victoria at Nizpro the F21 Force may be a look at what the future holds as Gods Gift did some 16 year ago. I guess we are in for interesting look to see if this is the way of the future. Time will be the ultimate judge"

[senna_T]

the peak torque figure rpm is what interests me, this is the benefit of multiple turbos, obviously they are smaller, but as the saying goes - many hands make light work!

[2MUCHKW]

Dont know about your analogy of many hands make light work but two smaller turbos will

= 2 turbos with lighter internals

= 2 turbos with less inertia

= 2 turbos with less lag

= 2 turbos with more boost at low rpm

= superior torque and throttle responce below 3000 rpm.

Time too start designing your tuned length manifolds and select turbos to best suit your application

[Slymeat]

M8 sounds alright, my thoughts would be to have a smaller than standard primary turbo and a larger secondary turbo. All the boost is sent to the smaller turbo lower in the rev range and a valve to actuate the larger turbo as the revs rise, and shut off the smaller turbo all into a single intake. So you have the benifits of less lag as there is less inertia in the smaller turbo and more power as the larger turbo takes over. Would feel like a rocket as the power built up. Or an easier method would be to grab an off the shelf supercharger kit for the n/a and have the supercharger do the work lower in the rev range, would be a lot easier as the kit already exists would also be very individual looking.

[senna_T]

Hmmm a twin charger set-up on a falcon, interesting...

I still think I'm going to explore the 3540 route, but with smaller rear housings. I have contacted GCG Turbochargers with the idea, and they are getting back to me today or tomorrow.

I will also be talking to a friend in the exhaust industry on wedenesday, as I have a friend about to embark on his own TT set-up in a VL (GASP!) using an RB30 bottom end with RB26 head - should be another weapon and rare set-up considering its in a VL!

[Fat-Tony]

I will also be talking to a friend in the exhaust industry on wedenesday, as I have a friend about to embark on his own TT set-up in a VL (GASP!) using an RB30 bottom end with RB26 head - should be another weapon and rare set-up considering its in a VL!

Rajab have set something up like this a while back. I got no idea of any news of it though.

[senna_T]

yeah they did - it was fully hectic! I'm pretty sure it was one of the brothers cars, he died and they turned it into their show car - makes stupid power, but I'm pretty sure they stayed with the complete RB30 engine - head included.

The guy doing this is my mechanic, and will be my business partner, so that's two demo cars for the shop!

Rajab Twin Turbo