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3 Liter intake on 2.5

Got the chance to test things. used a different style vacuum check valve with a 7/64 hole drilled through it. secondaries fully open at 4000 RPMs. Haven't done any 0 to 60 pulls , but the kick has returned from the secondaries opening later. Have to adjust my driving style a bit to take advantage of the way it drives now. I still believe that the secondaries opening slower and at a slightly higher RPM will improve driveability. got this week to find out.

This check valve is also found on Escorts with the 1.9 SEFI
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Driveability is improved. highway mileage is still 33 at 62mph. with the secondaries opening fully at 4000 RPM and the timing curve of the XGT1 computer at 4500 RPM things are very well matched. still have to get someplace to check actual numbers. I would do this mod again with no regrets.
 
erm, couldnt someone with a little electronics knowhow make a converter to go from the IMRC connection to an EVR solenoid and put that in path to the vac/op lim?
then you could have tunable secondaries, no ugly imrc, and the reliability of vac over a cheapo servo/stepper motor.

I'll add this to the list of things to have my father look into.

if anyone wants to donate a schematic of the IMRC circuit board that would be tons of fun for him...
 
Been busy at work. Removed EGR on auto car about 3 weeks ago. not for performance , but to track down idle problem. it was not closing all the way. helped with in town driving. More lower intake mods planned. pics to come when I get a break.
 
Wouldn't be something like this would it?
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I'm calling it a figure 8 port. :D

I have been trying to find an efficient way to cut this. Seems I need to buy more shop equipment.

I'm doing this from boredom/curiosity mostly... :eek:
 
Mayyyybe. starting to turn the 2.5 into an oval port engine with that step. It would match up with my UIM though. Nice job on reshaping the lower.
 
Been a while with this set up. Gas mileage has been consistant in the low 20's over the last couple months. next step is going to be putting stock manifolds with cats on the exhaust and removing the headers. I had gutted cats, then headers and y pipe. seems like a step backwards I know. Given there was no significant increase in power with the headers I will go back. I like long term experiments.
 
Not yet. spent most of the summer recovering from arm surgery.
I have the modified gaskets that I used on the upper intake so the two will match when I reshape the inlets. I do have a question as to how far down you reshaped things in relation to the secondary butterfly. I plan on leaving about a quarter inch above it to stay away from potential leaking and running into the type of driveability issues you get from pinning open the secondaries.
 
Wow, I hope your arm is doing well.

My situation is a little different. My LIM will be mating to 3L oval heads that have already been split-port matched. So the butterflies have been gutted, and the LIM will be cut all the way through. I expect poor results, but I want to datalog it anyway just out of curiosity to see if there are any interesting points to it that I may try to exploit in different ways. :crazy:

If I were shaping with butterflies intact, I would try to keep the transition as gradual as possible. It's hard to describe, but if you took a cross section between the two ports, it would look like a "V" shape (more like a sharp "U" shape) . the edges of this "V" would be knife edged. The "V" would dip down about 2/3 of the way to the butterfly, while the knife edge would carry out until almost immediately above the butterfly, and the knife edges would round out near the top of the port to match the UIM. So the knife edges wouldn't really be sharp until about 1/3 of the way down.

I think I'm going to make a picture now, I'm a visual person :laugh: I'll post a drawing a little later to help visualize.
 
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Its too bad the vacuum actuators pretty much can't be found anywhere other than junkyards anymore. And ... 1995 V6 Contours are getting hard to find. Lots of 95 Zetecs but no V6's at my local Pick N Pull.

Dealerships don't stock the part as its now considered obsolete. The only part I could find on Ebay was $80 had no pictures to even confirm if it was the correct piece.
 
I finally found an old V6 1995 at the pick N pull and took the actuator. Does anyone know for sure if the 95 has a check valve in it before the actuator, and if so can they take a picture of it? I couldn't find the valve on the donor car and it doesnt show in any of the vacuum diagrams I've seen.
 
i have a poblem with idle mine idles above 2000 which is way way to high can you help me out
 
Just an update. the auto trans car is still running great. started work on another intake, different direction this time. pics to come.
 
Time to move on. I removed the headers and the intake set up from the car. it still ran great, I just didnt want to send it on its way with my experimental parts.
Over the 2 plus years that the set up was installed driveability was much better. Really noticeable when I put regular parts back on. Gas mileage was improved as well.
Time to find a newer Mystique and do it again.
 
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