Hmm... 3.5 to 3.5HO Conversion - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 14 (permalink) Old 09-14-2005, 11:47 PM Thread Starter
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Lightbulb Hmm... 3.5 to 3.5HO Conversion

I was looking at the service manual for the second gens and I realized something: The only difference between the 3.5 and the 3.5HO are a couple of tuning valves in the plenum and the associated wiring and computer.

Hasn't ANYONE discussed this mod? Looks promising if you just have to have 10 extra hp and the bragging rights.

Is it really that simple or did I miss something? I know it would be a bitch to install but still, it might be cool. However, I think I can get 10hp somewhere easier...

If I can't find an R/T then Ill just build one out of my ES: (future plans, wont happen soon, college takes all my time and money!)

Ingredient list: 3.5HO wiring, electronics and plenum, R/T suspension (BIG item), autostick parts and of course, R/T badges. ABS optional (WAY too much work and cost, IMHO) I'll keep my painted 16 inch rims, I like them!

R/Ts are REALLY rare in Texas, I found a couple 2000s and a 2001 but they had too many miles, (over 75k) and were about 11 grand. I got my 2002 ES (loaded, everything but ABS and in dash CD changer) with 43k miles for 9500, so you can see why I settled for an ES so easily! ES models are rare too, I had to drive 240 miles to get mine.
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post #2 of 14 (permalink) Old 09-14-2005, 11:51 PM
 
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The R/T model is rare around here also. But they only made a few thousand per year for a couple of years.

The SE is everywhere.
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post #3 of 14 (permalink) Old 09-15-2005, 12:08 AM
 
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The SE rules! What?
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post #4 of 14 (permalink) Old 09-15-2005, 12:14 AM
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I flew to Norfolk, VA to get my R/T and drove it back to AL. It was worth it.
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post #5 of 14 (permalink) Old 09-15-2005, 12:21 AM
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heyy, another guy with a 2002 ES!
and you like your painted alloy wheels, me too, arent they sweet?
IMHO, they are even better then the R/T wheels
anyway, ive been thinking of doing the same thing with my ES, cept not adding R/T badging or anything, just adding everything to the engine to make it a 3.5HO
i'm not that great with engines or anything yet, so i dunno if i will ever actually do it, but i do think it would be cool
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post #6 of 14 (permalink) Old 09-15-2005, 12:54 AM
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Back to hardwareguy's original topic. There was someone selling an HO plenum awhile back and he was saying all that was required was the plenum and associated wiring which he was selling at the time along with a PCM reprogram. Here's the thread, maybe PM him and see what he knows about it:
https://www.dodgeintrepid.net/forums/...ghlight=plenum

Or maybe PM the buyer and see what success he had.
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post #7 of 14 (permalink) Old 09-15-2005, 02:43 AM
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What I would do is get an 99-00 one off a 300M. I would choose them because they are vacume operated and would be easier to install (not as much electronics to worry about. So get your hands on the above mentioned cars and check it out. You would need a vacume/switch to allow the vacume to enter the diaphram and the valves could be controled. I believe they operate a wide open throttle to give more torque. I used to have one on my other cars (back in the 60-70's to turn off the AC when I gave it WOT. A soinoid from an air ride would possibly work alone with a micro switch to operate it.
I was the one that bought the manifold, when I recieve it if it has some extra parts I will let you know. I am planning on using them to try to install two TB on the top of one and plugging up the back hole. so that the air comes directly form inside my Air Scoop through a filter into the manifold. Thus getting rid of any pipes that heat the air.
If the electronic control valve activator is a 12v type a micro switch at the TB might be all you kneed, besides the manifold.

Last edited by 300Michael; 09-15-2005 at 02:52 AM.
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post #8 of 14 (permalink) Old 09-15-2005, 11:25 AM Thread Starter
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If it's that simple, I may do this after I get the sound system and new rotors in. It'll probably be a summer project.

First mod: new stereo (Infinity Reference speakers, MTX or Xtant amps and factory 4 disc changer)

Second mod: Install Frozen Rotors and some good ceramic pads. I would like some names of good companies for ceramic pads.

Third mod: dunno, maybe the HO conversion.
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post #9 of 14 (permalink) Old 09-15-2005, 12:21 PM
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Quote:
Originally Posted by hardwareguy
...Second mod: Install Frozen Rotors and some good ceramic pads. I would like some names of good companies for ceramic pads...
Good choice on the rotors. However, I strongly recommend the Performance Friction Z-Rated pads. The term "ceramic pad" is too general to mean much among the different brands.
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post #10 of 14 (permalink) Old 09-15-2005, 06:19 PM
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Quote:
Originally Posted by 300Michael
What I would do is get an 99-00 one off a 300M. I would choose them because they are vacume operated and would be easier to install (not as much electronics to worry about. So get your hands on the above mentioned cars and check it out. You would need a vacume/switch to allow the vacume to enter the diaphram and the valves could be controled. I believe they operate a wide open throttle to give more torque. I used to have one on my other cars (back in the 60-70's to turn off the AC when I gave it WOT. A soinoid from an air ride would possibly work alone with a micro switch to operate it.
Not sure where the MTV is set to open/close but the SRV opens up at ~5000 RPM. If it opens up much before then you'll loose a lot of low-end torque and HP. That's why it's there - to move the torque & HP curves over when they start dropping off at high RPM's. You can see the jump in these dyno runs.

As for using the vacuum v solenoid model I'm not sure that makes a lot of difference. Either way you've got to trigger the thing.

Here's a good thread in the 1G forums about tuning valves. An interesting read to get an idea of what they're for and how they work ...
https://www.dodgeintrepid.net/forums/...ad.php?t=56693

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Last edited by D76G12; 09-15-2005 at 06:26 PM.
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post #11 of 14 (permalink) Old 09-15-2005, 11:15 PM
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I have the vacume on my car but one of my extra Manifolds has the electric. I just mentioned them both, because I didn't know which one he was getting. The valves are nomally open to the side chambers, allowing for more torque. When activated the valves open directly to the main center chamber (along with the side one's).
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post #12 of 14 (permalink) Old 09-16-2005, 10:45 AM
 
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Is that valve, or something similar on the 3.2? I've got one with a vacuum line..
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post #13 of 14 (permalink) Old 09-16-2005, 04:19 PM
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Quote:
Originally Posted by alarkyokie
Is that valve, or something similar on the 3.2? I've got one with a vacuum line..
It's the same thing - actually, I think it's EXACTLY the same thing if you check the part numbers.

All the 3.2L's had the vacuum lines - they didn't switch over to the solenoid until 2002 when they discontinued the 3.2L ...
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post #14 of 14 (permalink) Old 09-19-2005, 10:19 PM
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Looks like my deal to get the intake needed fell through. So I will try another source.
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