I was hoping one of you guys could help me narrow down my problem here. I just did a complete engine swap and am running a GT40 now. I had a few leaks I had to take care of to get the car to idle right but once those were taken care of the car started and idled just fine. Now when I take the car out for a small stroll around the block I notice i can't get the car to build any boost. It's actually barely getting to the 0psi mark when given gas. Where could this be coming from and waht can I do to narrow it down to a certain area or problem? I would think if it was on the exhaust side of things I would at least build a little boost and could hear a pretty loud exhaust leak. Can you boost leak test a rx7? If so how do you go about doing that? Any suggestion would be great. Thanks guys.

 

Is the car tuned at all? Ridiculously rich mixtures will prevent the car from building boost.

Some details of your setup would help...

 

hmm thats a very helpful little hint. No the car isn't tuned as of right now. I have a base map in place but the car is running rediculous rich right now. I listed my setup below. Please let me know what you think.

750 Primarys
1000CC Secondaries
Walbro 255lph pump
Power FC
GT40 Turbo
3" Turbo Back w/no cat
Very aggressive port

Would the overly rich tune cause the car not to reach 0psi? Obviously I'm not out to boost on base map tune but I want to make sure there are no major problems before paying someone to come out and tune the car and end up having him sit there for hours while I figure out boost leaks or something else. Anyway of testing this? I used to do a lot of work on DSM where we would cap the turbo off and pump compressed air into it and listen for leaks in the system that way. Would this work? Or would I be wasiting my time since technically the car would be making some boost even if their was a small boost leak somewhere. Any advice would be very helpful.

 

that seems like a small fuel system for that setup, but that another subject.

as far as boost goes, i would pressure test the intake track starting where the turbo would meet the intercooler piping. then also make sure that your wastegate isnt somehow stuck open. let us know.

 

I plan on doing this today. I know that Fuel system seems small but the reasoning behind it is simple. I am going to break in tune with the current fuel system. Then once broken in I plan on running the CJ Motorsports Fuel system with 1600 Secondaries and 1000 Primaries. I have been pondering if the 1000cc primaries will be overkill. Either way I am going to pressurize the intake system and see what I can find out.

I will let you guys know...thanks

 

What are your injector settings on the PFC commander right now? With bigger primaries. Expect it to run like crap until it's tuned...

and soapy water helps when you are pressure testing. it helped me locate a boost leak on my IAT sensor for example

 

Dont forget to rotate the motor to the best sealing position or the air will go righ through it!