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The mkiv Supra Owners Club

whats this and is it needed


LeeT

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the green thing on the intake manifold in the pic below. it had a vac pipe coming from it to thestock fpr but im in the middle of changing the fpr to an aeromotive. can i just bin this bit or is it still needed as i just broke it

injectoras 022.jpg

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it seems to be some sort of vaccuum operated switch that controls vac pressure to the fuel pressure regulator. as im replacing the stock fpr, i want to know if this needs to be there as ive broken the outlet to the fpr off

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It raises the hot start fuel pressure to aid if there is a vapour lock due to heat soak. You may get away without it, you may have hot start issues. You could disconnect it and see if you DO have issues, but in this weather you aren't likely to be having vapour lock problems, more likely problems turning the damned key because you're shivvering so much ;)

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It raises the hot start fuel pressure to aid if there is a vapour lock due to heat soak. You may get away without it, you may have hot start issues. You could disconnect it and see if you DO have issues, but in this weather you aren't likely to be having vapour lock problems, more likely problems turning the damned key because you're shivvering so much ;)

thanks chris, i'll have to disconnect it for now as ive broken it but i'll keep an eye out for another in the meantime

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Having said that, Vaux turbo engines have a similar contraption (called "hot start valve") and I discovered that it was worth ditching it altogether.

It was creating a risk of boost leak right on the FPR path, something potentially catastrophic. The manufacturer claimed that it helped start the engine when coolant temps were over 120C

I still don't understand why someone would be trying to *start* an engine that is so far into the red, but there you have it...

Maybe it would be of some use if one was in Cyprus midday middle of the summer, I don't know. But in the UK and Northern Europe nobody missed it, and lots of people have done the bypass and I would have known if there were problems (It is one of the 'recommended' mods I had on my site)

 

So there is another side of the story!

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If you have problems I think I have a good one somewhere, which I'd sell.

thanks chris, do you know whether jspecs have these? as ive just replaced my uk manifold with a jspec and theres no mounting holes to put this back on

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