boost controller question
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boost controller question
I have been searching the forum for info on some minor mods I am planning for my stock '86 turbo converted (j-spec I suppose) rx7. All I want to do is get the boost up from the 5.5psi it runs stock to around 10psi which I hear is OK for the stock turbo.Yes I will need to tackle the fuel cut issue (FCD?) but that is not what I am asking here. My mate has offered to make me a full 3" exhaust but I have it on good authority (RETed) that this will create over 12psi of boost. I'm confused because I thought maybe a boost controller could bring the boost back down but I was told that it doesn't lower boost, it raises it. I have been told that a ported wastegate will control the boost.
Now, my real question is: why can't I forget the exhaust and simply get a boost controller and crank it up to 10psi? Sounds too simple so this is probably a dumb question but I'd love to know the explanaition! Thanks in advance.
Now, my real question is: why can't I forget the exhaust and simply get a boost controller and crank it up to 10psi? Sounds too simple so this is probably a dumb question but I'd love to know the explanaition! Thanks in advance.
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Howdy from Osaka right now. Yes, the only way to lower the boost is to vent more of the gasses hitting the turbo, porting the wastegate. You can do a partial exhaust and see how high your boost goes or you could leave it stock and just get a boost controller to raise it. When you run higher boost on the stock exhaust the heat under the hood will get higher and boost spikes may become a problem but it should be fine. Just make sure everything is working right, especially the voltage to the fuel pump and the injectors are clean.
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