TPI swap with a modern twist
#41
Racer
Thanks for the info. This has motivated me, and I've been doing research and I think TPI is the way I'm going to go myself here.
Last edited by MikeKey; 05-13-2012 at 12:18 AM.
#42
Holley HP EFI w/TPI
Thread Starter
Here's how I ran the return line (it ended up being slightly different, but you get the idea)
Vacuum lines, fuel lines and coolant hoses completed.
Mounted the ECU and started the wiring (need to find a 2" hole saw)
Vacuum lines, fuel lines and coolant hoses completed.
Mounted the ECU and started the wiring (need to find a 2" hole saw)
#43
In the first pic that you posted above I see the braided line ziptied to the fuel cross tube. I can't remember if that tube is aluminum or steel. If it's aluminum you REALLY should put something around that braided line or it with the engine vibrations it will eventuall cut thru the cross tube, even a steel crosstube should be protected. A short section of fuel line wrapped around the braided line will protect that cross tube.
#44
Holley HP EFI w/TPI
Thread Starter
In the first pic that you posted above I see the braided line ziptied to the fuel cross tube. I can't remember if that tube is aluminum or steel. If it's aluminum you REALLY should put something around that braided line or it with the engine vibrations it will eventuall cut thru the cross tube, even a steel crosstube should be protected. A short section of fuel line wrapped around the braided line will protect that cross tube.
I have changed the routing, but I think putting heater hose around the line is wise advice.
#45
Holley HP EFI w/TPI
Thread Starter
Drilled the 2" hole in the firewall last night and started to run the wiring. (yes, I will add the grommet )
Last edited by moonsteel; 05-23-2012 at 01:39 PM. Reason: Added pic
#46
Racer
Snagged a TPI for $55 off CL. Need fuel lines and then some. But I'm going to slowly move towards this direction myself. After I finish my suspension and transmission.
#52
Holley HP EFI w/TPI
Thread Starter
Woohoo, it runs!
First start was pretty painless once I had the timing set properly (installed dist incorrectly)
Have a fuel leak around one of the injectors, so the first drive will have to wait.
First start was pretty painless once I had the timing set properly (installed dist incorrectly)
Have a fuel leak around one of the injectors, so the first drive will have to wait.
#56
Holley HP EFI w/TPI
Thread Starter
#59
Burning Brakes
#60
Holley HP EFI w/TPI
Thread Starter
I'm basing it off the MegaManual. My MAP sensor is close to the manifold.
Don't worry about how long your MAP sensor vacuum hose is. Intuitively it seems that shorter should be better. However, a few people have done tests to see how bad the effect of a long hose was on vacuum signal propagation. With a ~100 foot (~30 meters) coil of rubber tubing in between the MegaSquirt® and the engine, the result was that no delay was apparent. This was with about a 10 millisecond resolution clock. The reason for this is that air has so little inertia that it moves very quickly in response to a vacuum (this is how we fill the cylinders, after all!).
Don't worry about how long your MAP sensor vacuum hose is. Intuitively it seems that shorter should be better. However, a few people have done tests to see how bad the effect of a long hose was on vacuum signal propagation. With a ~100 foot (~30 meters) coil of rubber tubing in between the MegaSquirt® and the engine, the result was that no delay was apparent. This was with about a 10 millisecond resolution clock. The reason for this is that air has so little inertia that it moves very quickly in response to a vacuum (this is how we fill the cylinders, after all!).