Hey Guys!

I'm all new to the world of TPI and i have a couple of questions.

I have a '68 Camaro with a 327 cui (4-bbl Holley/Edelbrock intake) and a TH700R4. I recently bought a TPI setup for it and to make it run, a FAST EZ-EFI kit. I've been trying to figure out were the connector are going and have all of them in place by now. I have a seperate MAP-module i probably attach to the firewall since i don't have the bracket to mount it on the TPI.

I tried to take pictures of all the ports and for reference given them each a number. If some one could please help me answer if they just need to be blocked of or have some other purpose, i could move on :-)

what i have so far is that:
-#2 is for the brake booster vacuum?
-The air temp is the sensor in the rear of the plenum (orange arrow)
-Anyone know if the fuel pressure regulator is an adjustable one? (and how to adjust it)
-#4 vacuum for the MAP module?
-10 for one of the heater hoses
-I don't know if the water temp switch is in the right hole?

 

More pics....

 

1 PCV valve in driver’s rocker cover
2 brake booster
3 vacuum orb & HVAC
4 fuel ressure regulator
5 Schrader port
6 not sure – could be for MAP, but any holes in the plenum will serve the same vacuum function
7 fresh air supply for PCV (pass side valve cover)
8 canister purge
9 throttle heater outlet (in stock form goes to diverter valve, but you can skip this whole setup unless you are driving this thing on the Alaskan ice hiway)
10 should be a 5/8” hose nipple that attaches to #11 with a question mark shaped heater hose in stock form
11 throttle heater inlet – also see # 9
? that sensor is the CTS. The other hole is for the 9th injector time delay switch that you do not have, so you can plug it

 

And yes, your FPR appears to be the adjustable type. Looks like the black **** on the top is the adjustment. Stick a pressure guage on #5 and dial it where you like it.

 

THANKS! I really appreciate your help!

So #3 could be used for the distributor vacuum advance?

#6 I attached a picture of my MAP sensor. The inlet is pretty small compared to #6. I don't think it will work.

#8 i guess i can block off

#9 and 11 is just i pipe going through to heat up the throttle body?

Is the sensor in the front in the correct hole? I've seen pictures of the sensor both ways.

Thanks!

 

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Where do i find ported vacuum on a TPI?
No unfortunately the FAST EZ EFI kit only manage the fuel delivery so i have to run my "old" distributor.

So #3 could be use for the MAP sensor.

I guess i also need some vacuum for my trans lock up.....

Sorry for all the dumb questions

 

The small port under the stock TB may be the only ported source


It is preferred to run the MAP on it's own dedicated lines mounted as close as possible to the vac source so as to get the most accurate reading and response.
Any other vac requirements can be T'ed together from another port.

FWIW
You don't need a ported source for the vac advance ; that was primarily used for emissions reasons
read
http://www.bangshift.com/forum/showt...l=1#post622365

most with HiPo engines use manifold vac for better and cooler Idle

 

Okay. A lot of good info on that page. Looks like i'm going to drive without the vac advance then.

Thanks for all your help!!

 

Wow, nice info. That article filled in some blanks I had in my head. Go with manifold vacuum.

Even old guys like me like to learn something new.

 

I thought of the manifold vacuum too but some of the replies says it will make problems at idle? Some of the technical words makes no sense to me so i might missed something. (From Denmark, Europe)

 

NO
You still use the vac advance but CONNECT it to manifold vac ; not the ported vac
That allows you to have the benefits of having more advance at idle debated in the link above
You are still going to have to set your required advance curve the old skool way by adjusting weights and springs / stops in the dizzy

 

Unfortunately it is a little like a Ford vs Chevy argument, each side has it's valid points and true believers will never agree
Having grown up with manifold vac dist it make sense to me (anyway) to run manifold vac.
Problems may arise however when you try using a smog age dizzy on manifold vac because as outlined they have advance curves designed to work with ported vac only

 

I have alway used the ported vacuum when running with a 4-bbl carb. I will try to connect the manifold vac to see if it will work. I have a MSD ready-to-run distributor (http://www.summitracing.com/parts/ms...make/chevrolet) and according to the manual I have to use a ported vacuum:

Vacuum Advance: The vacuum advance will advance the timing up to 10° during partial throttle driving (with 15 lbs. of vacuum). The vacuum line should be routed to a ported vacuum outlet above the throttle plates.

 

I run the EZ-EFI too and had my 8361 distributor (similar to yours) vac advance coming from the intake manifold. I think that was wrong (crappy idle 75% of the time) and am now looking for that ported vacuum source. Did you use one of the ports on the throttle body?