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Old 10-17-2003, 06:33   #1 (permalink)
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Best I6 manafold for force feading.

Well getting serious about turboing my EA, im looking at what manafold to run. I know the EA/D manafold will give easier pipe work as the TB is down in the passanger side front, and will hook up to a intercooler outlet easier than an EF/L manafold. I have the choice of using an EF/L or switching to an EA/D manafold for my turbo motor.

Is there any flow reasons why the EA/D manafold is used over the EF/L one? the 10.2sec EL Ghia uses an ED manafold, im wondering if this is for flow purposes as well as ease of plumbing.

The car will be running LPG and ECCV (from an EL), so going to ED manafold I will loose the BBM switching, but retain ignition map changing. Will this cause a problem with pinging down low (below 3800) as the ECU will expect the runners to be long. Im not going to use an aftermarket computer if i can avoid it (Straight LPG).
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Old 10-17-2003, 16:30   #2 (permalink)
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Re: Best I6 manafold for force feading.

the ed one is still the best to use on a budget set up.

it has a 3.2lt plenum (the bbm is slighty less- around the 3.0lt). the way the runners go into the ed plenum is also great, they are very smooth with bell mouthed ends on them.

as for the ecu pinging... it wont, as the ed manifold is not much shorter then the bbm long runner length.

also the shorter pipe work that comes with running the ed manifold will mean better throttle response.

cheers.joe.
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Old 10-18-2003, 01:16   #3 (permalink)
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Re: Best I6 manafold for force feading.

The other advantage would be that the throttle/manifold inlet is already on the opposite side of the exhaust/turbo position, so you can run the intercooler piping straight from the intercooler to the manifold, without having to go around the rocker cover, like the EF/EL manifold. If they flow better, have a bigger plenum and have shorter runners, these are all good reasons as well.
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Old 10-18-2003, 04:16   #4 (permalink)
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Re: Best I6 manafold for force feading.

On forced applications the EF-EL manifold is best left in long runner mode, it has been found by me and many other people using this manifold that in short runner power is losed through the entire rev range, the only time it has been seen to make more power is above 6500RPM. I have set mine in long runner by applying vacuum to it with a one way valve, so that when i hit boost it stays open, the even better way to go is to pull the manifold apart remove the butterflys and weld up the two ends to stop leaks. I am planning on doing this but haven't had the time to yet.
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Old 10-18-2003, 04:54   #5 (permalink)
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Re: Best I6 manafold for force feading.

What runners are used on turbo xr6?
bbm is not used on them so it's either locked on short or longer length...Generaly though with blown applications a shorter runner is better or more the point can get away with shorter..
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Old 10-18-2003, 09:08   #6 (permalink)
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Re: Best I6 manafold for force feading.

BBM isnt used on XR6T??? I know it uses the EF/L/AU/BA intake manafold but i didnt know it was locked in one position.

I think i will source out a ED manafold. Im sure some of the NA guys would like my spare EF intake manafold+fuel rail etc...
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Old 10-18-2003, 19:44   #7 (permalink)
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Re: Best I6 manafold for force feading.

There was an interview with some ford guy posted on FF a while back about the XR6T, he said they took the butterflies out. Every other question he answered with "I'll have to ask an engineer".
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Old 10-18-2003, 21:13   #8 (permalink)
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Re: Best I6 manafold for force feading.

so essentialy its running on long and short runners, efectivly making a very large plenum and very short runners
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Old 10-19-2003, 03:14   #9 (permalink)
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Re: Best I6 manafold for force feading.

Butterflies out would be long full time.. Right ???
Or which way do they work???
Or is it locked ???
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Old 10-19-2003, 19:30   #10 (permalink)
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Re: Best I6 manafold for force feading.

no butterflys would let the air go through long and short runners. However as the runners meet before the head. Everewhere before they meet would almost be concidered the plenum, and the runner length would only be from where the two runner meet to the head. Effectivly giving the car a large plenum and short runners.
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