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The mkiv Supra Owners Club

Are there advantages of having UK turbos?


Jim_1979

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So what advantage do they have by fitting steel blades to Hybrids Nic, or is it that they cant get ceramic ones to fit as surely ceramic being faster spooling would be better. And from the early days of being on the bored, UK's where always regarded as slightly more powerfull but as I understand on Hybrids the housing is often bored out slightly no......

 

They fit steel internals to hybrids because that is all that's available.

 

The housings are machined out to fit the bigger internals which will make a bit more hp

 

The sequential turbo system was not designed to be running high boost pressures and becomes a restriction, there is a limit to the boost you can run before you start generating heat and no more hp.

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They fit steel internals to hybrids because that is all that's available.

 

The housings are machined out to fit the bigger internals which will make a bit more hp

 

The sequential turbo system was not designed to be running high boost pressures and becomes a restriction, there is a limit to the boost you can run before you start generating heat and no more hp.

 

And that boost is you are saying 1.2.......I thought Hybrids only produced a little bit extra because you can run them up to 1.4 ???

 

So whats your thoughts on running hybrids at 1.4 given the restrictions of the sequential system ?

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And that boost is you are saying 1.2/1.3.......I thought Hybrids only produced a little bit extra because you can run them up to 1.4 ???

 

So whats your thoughts on running hybrids at 1.4 given the restrictions of the sequential system ?

 

Hybrids usually run slightly bigger internals which is why they can flow more air and generate more hp.

 

You could run hybrids and stock turbos as 1.4bar, in the end though the stock system is the limiting factor as the more boost you run the more heat is generated.

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UK Supras should in theory produce a little more power at higher RPM than the J spec due to the exhaust cam being longer duration and slightly higher lift, as for turbos either will make a bit more power/torque if they are bored out and fitted with larger turbines, if done correctly, up to 450bhp is available, without having to wind them up to 1.4 bar, some have said even 500bhp but i find that hard to believe.

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UK Supras should in theory produce a little more power at higher RPM than the J spec due to the exhaust cam being longer duration and slightly higher lift, as for turbos either will make a bit more power/torque if they are bored out and fitted with larger turbines, if done correctly, up to 450bhp is available, without having to wind them up to 1.4 bar, some have said even 500bhp but i find that hard to believe.

 

The UK turbos are slightly smaller though, so probably not a lot in it even with the longer duration cam fitted.

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1.2bar should be your limit regardless of jspec turbos, uk turbos or hybrids, you said you have a jspec motor which is MAP based, in stock form this only reads upto 1.2bar beyond this and your fueling is in the hands of the gods, not good.

 

UK/US motors could in theory run higher boost on hybrids as they are MAF based but as Nic said heat will become a problem.

 

Did you have anything else replaced or just the turbos?

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1.2bar should be your limit regardless of jspec turbos, uk turbos or hybrids, you said you have a jspec motor which is MAP based, in stock form this only reads upto 1.2bar beyond this and your fueling is in the hands of the gods, not good.

 

UK/US motors could in theory run higher boost on hybrids as they are MAF based but as Nic said heat will become a problem.

 

Did you have anything else replaced or just the turbos?

 

Im J-Spec MAF so thats good to read, so just need to watch the old AFR's then....;)

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VVTI eh, they still have little 440cc injectors as standard though dont they.

 

Yeah ok, but I mean with bigger injectors, on hybrids using the sequential system, you should be pretty good, or in a lot better position fueling wise at 1.4bar then a pre VVT-i J-spec supra at 1.4bar..........;)

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