Twin Turbo

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Sunny side up!

New Member
Hey Guy's

Did a search, but nothing. was wondering has anyone tried a twin turbo setup before? is it possible to do 2x T25 or a T25 into a T28 (spool up faster,etc...). Just looking for info about this really, benefits, etc...

cheers
 
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markwashington

Guest
I believe there are some threads on this from back in the early days of the forum although I couldn't find them quickly. If I remember rightly the main reasons as to why it hasn't been done are cost, and the fact that twin turbo = more weight and not necessarily more power (see Supra). I suspect if you've got enough money to spend designing a twin turbo setup for the R it would be better spent designing a transmission that can handle serious power (700bhp+) as it's possible with a single turbo.
 
shroom

shroom

Active Member
must people running big power on a supra or skyline change to a single turbo or thats what I think, why bother, as pulsar bob bangs out just enjoy the car for what it is a beast at 350bhp, but if thats what you want please have a go new thinking and different things are always good to watch
 
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essex_jamie_GTiR

New Member
Same as above most people do tend to single turbo there twins as they can get same power out of 1 turbo. Costs would be big and a better gearbox and a 400bhp Pulsar would be far a better project but if you do it would love to see the buid up of it.
 
PobodY

PobodY

Moderators
Staff member
I'd be more interested in what you could do with a supercharger instead. - I got the impression that traditional twin-turbo applications were replaced with variable vane compressors now, but that might just be marketing wank that I read.
 
johnsy

johnsy

Active Member
why bother really power isnt everything ,

id be more inclined to make the pulsar go round corners faster and stop better
 
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Makaveli_se7en

Member
johnsy said:
why bother really power isnt everything ,

id be more inclined to make the pulsar go round corners faster and stop better
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I wasn't being GTiR specific in my post, I agree if you're running round on stock brakes and suspension you've other places to spend your money first rather than two stage turbocharger set ups.

I was just pointing out that its possible to get a good spread of usable power going down that route, although it would take a fair about of work in terms of fabriaction and some detailed turbo sizing to make the most of such a sytem.
 
fubar andy

fubar andy

Moderator & N/W Rep
Staff member
Makaveli_se7en said:
I wasn't being GTiR specific in my post, I agree if you're running round on stock brakes and suspension you've other places to spend your money first rather than two stage turbocharger set ups.

I was just pointing out that its possible to get a good spread of usable power going down that route, although it would take a fair about of work in terms of fabriaction and some detailed turbo sizing to make the most of such a sytem.
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It would be great to see such an addition to our cars, but no company would spend the R&D time on it and the gearbox would have to be sorted before we went any further.

I like the concept though.
 
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turugtir

New Member
Where you guys want to put the second turbo? There's not a lot of space in the bay.

Also, there's more rotational mass in 2 turbos than in one big turbo, so lag would be the same, if not more than with a single turbo, if you don't do a sequential or compound turbo system.

There are some kits developed for the Silvia SR20, I remember one of them being an SXOC trader, but I looked and he is no trader anymore, and I don't remember the name.

Do a search on the internet because it has been done already, just not on a GTIR.
 
PobodY

PobodY

Moderators
Staff member
Makaveli_se7en said:
Two stage (compound) turbocharging FTW. Have a look at CPR's twin stage Evo 9, it makes 600ftlb at 3800rpm on pump gas.

http://www.youtube.com/watch?v=ZvJVUS-8jlw

THe VG vs two stage argument really is application dependant, but if emissions are taken out of the equation and pakaging isn't an issue I'd swing towards a two stsge solution.
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Thanks Ed - I recognise your expertise on this subject. It looks like I was taken in by the marketing blurb on the VG products then...

If space is an issue, why not supercharge for the low-end, and turbocharge for the top-end?

(I'm going to keep plugging this supercharger idea until someone tells me why it's so bad.)
 
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Makaveli_se7en

Member
I spoke to the owner of the cpr's evo at Harewood Hillclimb last year and he had sold his 997 turbo to fund the development of that evo, to give a rough idea of how much money is involved. I do have some picture of under the bonnet, but I did promise that I wouldn't put them on the internet as he was understandabley quite protective of the work that had gone into the car. I will say though the way it was packaged looks as if it could be done on a GTiR with relocating the usual washer bottle, battery etc. As said we come back the age old problem of getting a gearbox to stand up to it, but if you're spending 70K+ I'm sure theres budget for a decent gearbox lol

As for superchargers, I like superchargers (lets be honest supercharger whine is cool), the only downside of a superchargers are they are crank driven so you're taking power out to drive them, whereas turbos are free power essentially as they take energy out of the exhaust gas which would be otherwise lost (I know thats a bit of a simplification but will do for now).

I have seen a couple of compound charging systems using superchargers, the nicest install was a grey 500bhp Lotus Exige in the states. It retained the 1.8 Toyota lump and used the supercharger as the first stage feeding into a GT3076.
 
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markwashington

Guest
I love the fact that in theory at least it's possible. I'd love to see someone try it and see what happens, If you could get the system to work it can be trialed at very low boost to get it working thus sparing the gearbox, then once it's working properly, up the boost and replace the gearbox, plus everything else that falls off.:-D

I promise that if I ever win the lottery/land a job that pays me what I'm worth I'll have mine converted to superturbo. :thumbsup:
 
Smo

Smo

Active Member
You're better off twin-charging rather than going for a twin turbo in my opinion. Norris Designs are in the process of building a customer car with a twin-charged setup that's already producing phenominal figures.
 
red reading

red reading

Active Member
Smo said:
You're better off twin-charging rather than going for a twin turbo in my opinion. Norris Designs are in the process of building a customer car with a twin-charged setup that's already producing phenominal figures.
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What? twin charging? do you mean compound turbo (one feed's into another) twin turbo's (one small one large) or twin superchargers (compound or sequential config) , Or compound turbo/supercharger setup. I can't make sense of what you have written.
 
S

Sunny side up!

New Member
well, I'm starting to think maybe a single turbo setup with money in other areas like handling & gearbox. it would be interesting for the future though, when I have bigger pockets. but love the idea of a supercharger & turbo setup, would be immense!
 
Smo

Smo

Active Member
red reading said:
What? twin charging? do you mean compound turbo (one feed's into another) twin turbo's (one small one large) or twin superchargers (compound or sequential config) , Or compound turbo/supercharger setup. I can't make sense of what you have written.
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A Supercharger and turbocharger bud, like the latest Scirocco.
 
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