GT350 Intake Manifold Questions

[15wile]

Saw a few threats about bolting on GT350 manifold and throttle body. If you buy them, are there any other parts you need to install them correctly?

And who has the best tune for that setup?

Already have catback... should I get catless headers too? Or not much diff?

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[Gibbo205]

JDM for tune.

 

[bullet6236]

Saw a few threats about bolting on GT350 manifold and throttle body. If you buy them, are there any other parts you need to install them correctly?

And who has the best tune for that setup?

Already have catback... should I get catless headers too? Or not much diff?

From my personal experience:

So the GT350 IM and Lund tune are complete and there really isnt enough runway in the Dallas DD to pull through the RPM range....looking forward to getting on some open road.

I will say the IM install has a few twists.

1. The threads on the 350 TB for the purge valves are fine threads whereas they are coarse on the GT. No big deal to grab new ones, but sucks when you are mid install and realize this.

2. Everyone has a different vacuum line hook-up and it is difficult for another to explain without pictures, even then it's a little tricky. A major shout out and thanks to [MENTION=19063]Higgs Boson[/MENTION] and [MENTION=10666]Nick@JDM[/MENTION] who saved my butt on Monday with pictures and explanations on what needed to be done. Funny thing is, my final line connections are completely different than both of theirs, go figure.

3. I had to snip wires on two harnesses and splice in additional wiring. The purge valve on the TB and the connector at the back of the TB on the top passenger side, this one was the hardest and wasn't even close to making the connection point.

4. Buy the silicone TB to air box connector before install. I thought I could find this at a local parts store and spent over an hour running around on Sunday...time I should have spent on the install.

5. I stripped the IM manifold bolt while torque into the head. I'm never this lucky...the broken bolt backed out by hand and the new bolt popped right in to the IM. I re-tightened without a torque wrench and will take a look a that this weekend at the Ford house.

 

[15wile]

From my personal experience:

So the GT350 IM and Lund tune are complete and there really isnt enough runway in the Dallas DD to pull through the RPM range....looking forward to getting on some open road.

I will say the IM install has a few twists.

1. The threads on the 350 TB for the purge valves are fine threads whereas they are coarse on the GT. No big deal to grab new ones, but sucks when you are mid install and realize this.

2. Everyone has a different vacuum line hook-up and it is difficult for another to explain without pictures, even then it's a little tricky. A major shout out and thanks to [MENTION=19063]Higgs Boson[/MENTION] and [MENTION=10666]Nick@JDM[/MENTION] who saved my butt on Monday with pictures and explanations on what needed to be done. Funny thing is, my final line connections are completely different than both of theirs, go figure.

3. I had to snip wires on two harnesses and splice in additional wiring. The purge valve on the TB and the connector at the back of the TB on the top passenger side, this one was the hardest and wasn't even close to making the connection point.

4. Buy the silicone TB to air box connector before install. I thought I could find this at a local parts store and spent over an hour running around on Sunday...time I should have spent on the install.

5. I stripped the IM manifold bolt while torque into the head. I'm never this lucky...the broken bolt backed out by hand and the new bolt popped right in to the IM. I re-tightened without a torque wrench and will take a look a that this weekend at the Ford house.

Sounds like I'm going to have to call a buddy to help me with this, then. I do NOT want to fuck this up.

Was the upgrade worth it?

 

[Mikeiscoo2]

From my personal experience:

So the GT350 IM and Lund tune are complete and there really isnt enough runway in the Dallas DD to pull through the RPM range....looking forward to getting on some open road.

I will say the IM install has a few twists.

1. The threads on the 350 TB for the purge valves are fine threads whereas they are coarse on the GT. No big deal to grab new ones, but sucks when you are mid install and realize this.

2. Everyone has a different vacuum line hook-up and it is difficult for another to explain without pictures, even then it's a little tricky. A major shout out and thanks to [MENTION=19063]Higgs Boson[/MENTION] and [MENTION=10666]Nick@JDM[/MENTION] who saved my butt on Monday with pictures and explanations on what needed to be done. Funny thing is, my final line connections are completely different than both of theirs, go figure.

3. I had to snip wires on two harnesses and splice in additional wiring. The purge valve on the TB and the connector at the back of the TB on the top passenger side, this one was the hardest and wasn't even close to making the connection point.

4. Buy the silicone TB to air box connector before install. I thought I could find this at a local parts store and spent over an hour running around on Sunday...time I should have spent on the install.

5. I stripped the IM manifold bolt while torque into the head. I'm never this lucky...the broken bolt backed out by hand and the new bolt popped right in to the IM. I re-tightened without a torque wrench and will take a look a that this weekend at the Ford house.

so in regards would this install be easier with the stock TB/ with the TB adapter?

 

[bullet6236]

so in regards would this install be easier with the stock TB/ with the TB adapter?

The TB is not the hardest part of the install. Getting the wires lengthened and getting the IM out are the hardest parts.

 

[steveespo]

JDM has the purge valve wire harness for I think $29 with OEM connectors so no cutting there. I ordered a GT350 brake booster vacuum line which fits perfectly of course, although you can cobble up with some 3/8 and 1/2 vacuum hoses and an 3/8 to 1/2 barb fitting. Factory stuff just looks better. I used the GT350 factory CAI that I got for $24 through Fordparts.com/Auto Nation White Bear Lake, although Ford caught on to this and I think it is now $270, still perfect fit for all connection and it includes the GT350 specific MAF sensor. As for the IMRC wiring at the back of the manifold I was able to un wrap some of the tape from the harness and get the wires connected without cutting and splicing. Another solution is to but the GT350 specific engine harness from Ford, about $125 from above source. Not really needed though.
Finally for the tune, go with JDM, I had a long and expensive remote tuning experience with another major player in the game and we just couldn't get it close to right. Jim and Nick at JDM hooked me up and the car runs and performs perfectly right out of the box. Very satisfied with the experience.
Steve

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