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The mkiv Supra Owners Club

Boost Pressure


Billy

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Originally posted by MONKEYmark

is 1.4 bar still too much to run with a front mount intercooler and water injection?

is it the heat that kills turbos or just overboosting

 

highest i have hit is 1.4bar with cw pipes

not fitted fmic yet and was going to get water injection to bring temps down

 

At 1.4 bar stock turbos will be overspeeding badly, and the charge air temps will be dangerously high, especially as most stock intercoolers are now falling apart (news on a fix soon...).

 

It really needs reducing to about 1.2 bar max.

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Originally posted by Billy

that sounds possible ill take the ties off and try it.if there is any one else with a simular set up can you please post what boost you are making

 

I have Blitz Nur Spec, TRL FCD, CW Down pipe and HKS mid de-cat pipe. I have hit 1.45 bar in the summer!

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Originally posted by Billy

chris if i get you to fit an uprated side mount intercooler and water injection what then woud be the max safe boost you can run on a j spec with stock fueling and turbo's

 

1.2 bar still, but with more safety than without WI and a knackered stock I/C. The turbo speed will be similar. Overspeeding is the killer of the turbos, heat is the engine killer (comustion heat and det that it causes).

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Originally posted by Billy

Cheers Chris. as you know I am currently making 1 bar how accurately can you achieve 1.2 bar by fitting a bleed t can you set it spot on or will ambient air temp affect it making you have to constantly adjust it

 

I have never had a problem with ambient air making a noticeable difference to boost pressure. A good valve will allow you to set + or - 0.5 psi easily. They are FAR less hassle than the electronic controllers on sequential turbos, IMO.

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