killinprixs Posted June 2, 2021 Report Share Posted June 2, 2021 (edited) run PCV valve to intake? yes or No? I was told by a reputable guy not to do so . Edited June 3, 2021 by killinprixs Quote Link to comment Share on other sites More sharing options...
55trucker Posted June 7, 2021 Report Share Posted June 7, 2021 As with any Turbo application the pcv, the brake booster, the hvac controls have to be *shut off* when the engine is under boost, generally a one way check valve is in the routing for all of these devices to prevent pressure feedback to them when one gets on the throttle. The pcv doesn't get a rerouted alternative path for vacuum, the original routing is the same, there is just more devices in that path to aid in controlling the pressure buildup when under boost. I'm sure that one of the Turbo GP owners here who have the 89-90 OEM service manual might post up the vacuum routing path for you. Quote Link to comment Share on other sites More sharing options...
pontiac6ksteawd Posted June 10, 2021 Report Share Posted June 10, 2021 (edited) The breather for both my 89 and 90 TGP, from the factory, were routed straight into the air intake box. I took off that system when I installed my directed warm air intake, and just put a breather on. I wish I had done a catch can instead. Mine did not have a PCV system. When I had the intake manifold off, there was a plug/cap on the port where the PCV would have plugged in. There was nothing in my rear valve cover. Edited June 10, 2021 by pontiac6ksteawd Quote Link to comment Share on other sites More sharing options...
killinprixs Posted June 24, 2021 Author Report Share Posted June 24, 2021 Thanks for the replies. Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted June 25, 2021 Report Share Posted June 25, 2021 I would try factory routing, but put a catch can inline. There are "performance" pcv valves by the way that can be adjusted for higher performance engines. Quote Link to comment Share on other sites More sharing options...
killinprixs Posted July 30, 2021 Author Report Share Posted July 30, 2021 NO thanks on the factory routing , thats probably fine for stock baby t25 setup... Im running a monster turbo ... and you dont want to boost your crank case for various reasons.. Stock PCV valve can only hold back so much pressure from a turbo like this until boost blows through that sucker .... creating issues you dont want . I'm going to go with what has already been confirmed from other big turbo guys , and similar to what Pontiac6kste Said.... I have a buddy who runs CCC racing, they push Honda's into the 8s in the 1/4 mile , no PCV valves just breathers. Quote Link to comment Share on other sites More sharing options...
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