Twin turbo,s dump valves ?
Discussion
stevieturbo said:
Tony427 said:
Can I just ask what Turbos you are using?
Once through IVA I intended to turbo my Lexus engined Cobra but am now undecided between twin or single Turbo.
What would you advise?
Use would be only for mild hooning, too frightened of running out of talent to track the thing.
Cheers,
Tony
How much power ? and are you after new, used, cheap as possible ?Once through IVA I intended to turbo my Lexus engined Cobra but am now undecided between twin or single Turbo.
What would you advise?
Use would be only for mild hooning, too frightened of running out of talent to track the thing.
Cheers,
Tony
With a 4.0....and so many modern turbo petrol cars out there, there will be plenty of capable second hand turbos out there, although a lot of OEM stuff have odd flanges and fitments
On the cheap, Subaru TD04's are great fast spooling little units, or almost anything starting GT28 would be a decent bet. Or some of the KKK's fitted to either 1.8t or the 2.0 VAG group engines.
I had planned on going dowm the twin GT28 route but time has moved on and I now hear tales that big singles are as responsive these days as twins, especially as I already have 4 litres so immediate spool response may not be paramount.
A big single would be easier for underbonnet packaging I have a nice space available next to the NS exhaust manifold and can put in a crossover pipe under the sump.
Are larger singles as responsive as twins these days? ( That souunds like a question for a dating site?)
Would like to get started as cheaply as possible ( secondhand/ breakers) and frankly don't trust the new Chinese stuff on internet auction sites. Is this justified or am I tarring every chinese turbo with the same brush?
Cheers,
Tony
Tony427 said:
I'm looking for something that I can begin with on standard ecu ( about 6 to 8 psi) and which I can upgrade with standalone Ecu when I have to replace the standard auto box and thus can lose the autobox control function within the OEM ecu.
I had planned on going dowm the twin GT28 route but time has moved on and I now hear tales that big singles are as responsive these days as twins, especially as I already have 4 litres so immediate spool response may not be paramount.
A big single would be easier for underbonnet packaging I have a nice space available next to the NS exhaust manifold and can put in a crossover pipe under the sump.
Are larger singles as responsive as twins these days? ( That souunds like a question for a dating site?)
Would like to get started as cheaply as possible ( secondhand/ breakers) and frankly don't trust the new Chinese stuff on internet auction sites. Is this justified or am I tarring every chinese turbo with the same brush?
Cheers,
Tony
I had planned on going dowm the twin GT28 route but time has moved on and I now hear tales that big singles are as responsive these days as twins, especially as I already have 4 litres so immediate spool response may not be paramount.
A big single would be easier for underbonnet packaging I have a nice space available next to the NS exhaust manifold and can put in a crossover pipe under the sump.
Are larger singles as responsive as twins these days? ( That souunds like a question for a dating site?)
Would like to get started as cheaply as possible ( secondhand/ breakers) and frankly don't trust the new Chinese stuff on internet auction sites. Is this justified or am I tarring every chinese turbo with the same brush?
Cheers,
Tony
But really, if a single is easier to package, just go for a single, dont get hung up on it either way. Sized right is sized right, you can get it right or wrong whether it's twins or a single.
Only think about the large single....is there may be slightly fewer options knocking about on the used market. That said if it's lowish boost/power, then some of the GT35/GT40ish type sizes would probably be quite fine.
If you can re-use factory exhaust manifolds and just make adaptor pipes, small diameter to the turbo, even easier.
unless you have some sort of interface to see what the Lexus ecu is doing its going to be a shot in the dark getting it tuned safely and why I went with aftermarket although very basic ecu . Just getting rid of the std manifolds will net 30+ hp on the 1 uzfe .
Starting my build now I doubt I would bother with turbos as the car is light enough and the torque available is always enough without any boost to scoot along on public roads ,
Starting my build now I doubt I would bother with turbos as the car is light enough and the torque available is always enough without any boost to scoot along on public roads ,
Just to wrap this up I took the car over to Bailey performance on Saturday and before adding the meth /water we got 350/380 lb ft at 8 psi and 14 deg advance all in . Meth spray didn't add any power neither did a bit more ignition so the only way up is boost but it's more than enough for now .
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