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Bill Good
Dodge Dakota
12/03/2001
20:25:25
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 Subject: Free modification
IP: Logged
Message:
I own a 2000 r/t with a few mods, jba headers,
gen 2, mopar perf. pcm, ported T. B. Today I tried a idea I had after reading a post on the delphi r/t forums. The map sensor[ mounted on the front of the throttle body] has a vacuum elbow under it. First I reversed the elbow{so it points to the front of the truck] put a vacuum cap on the nipple on the throttle body where the elbow was, cut the vacuum line running striaght up from the brake booster[between booster and check valve] and installed a vacuum tee and installed a new vacuum hose and connected it to the elbow on the map sensor.Just went for a ride and my throttle response seems alot quicker!!!Truck feels a lot more responsive. Some one else try this and let me know what you think.
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Brian024.7
Dodge Dakota
12/04/2001
10:26:22
| RE: Free modification
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Message:
please explain what exactly this does...
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conig
Dodge Dakota
12/04/2001
13:48:57
| RE: Free modification
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Message:
off topic but where is the map sensor on a 4.7
thankyou in advance
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Texas97
Dodge Dakota
12/04/2001
15:38:13
| RE: Free modification
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Message:
That sounds very interesting and I would like to try it. But yeah, I would like to know what exactly this does? Is it something that might come off during off-roading? Also, do you think that the throttle response will be the same for a stick shift?
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Quaddak
Dodge Dakota
12/04/2001
16:33:42
| RE: Free modification
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Message:
I am not positive but the map sensor gets the vacuum from under the throttle body. Moving the vacuum port to the vacuum brake booster line means the vacuum sensor is now monitoring the vacuum in the plenim instead.
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b. good
Dodge Dakota
12/04/2001
17:53:06
| RE: Free modification
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Message:
map [ manifold absolute pressure sensor] senses engine vacuum or lack there of[ flooring it]. by moving the source of vacuum to the sensor the drop of vacuum is much quicker from the manifold than the port the map sensor is connected to. I put 50 miles on the truck today and can`t believe the difference in part throttle acceleration. It works. Should work on 5.2`s and 3.9`s as well. [sorry 4.7`s] Heres a list of what you need; A 3/16 vacuum cap, a1/4 by 1/4 by 1/4 vacuum tee, a 1/4 to3/16 vacuum line reducer, 2' of 1/4 inch vac line[ cut to fit] and maybe a torx socket to remove the sensor to make hooking things up easyer Your auto parts man can hook you up and it'll cost you little.
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Texas97
Dodge Dakota
12/04/2001
18:16:35
| RE: Free modification
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Message:
sorry, need to make sure....is that 2 feet of 1/4 inch vaccum line or two inches of vacumm line. Sorry, just want to make sure its not a punctuation mistake before I go cutting on my only form of transportation! :)
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b. Good
Dodge Dakota
12/04/2001
21:30:22
| RE: Free modification
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Message:
That would be two feet [part stores sell it by the feet] and then cut to the length you need to run from the tee you install,to the map sensor.
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bernd
*GenIII*
12/05/2001
00:20:02
| RE: Free modification
IP: Logged
Message:
It's a cute trick but will only work properly on big cam/head engines. The reason for this is to regain the signal to the MAP sensor when you have a lower manifold vacuum signal due to the camshaft lobe seperation and duration.
What it does is easy, when you raise the MAP vacuum signal, you're leaning it out a bit more. Why it works on some vehicles...they are running a bit rich from the factory. Nothing else.
1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.93 @ 93.26mph
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Brian024.7
Dodge Dakota
12/05/2001
01:22:01
| RE: Free modification
IP: Logged
Message:
thats a good explination Bernd, thanks
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b. good
Dodge Dakota
12/05/2001
17:47:43
| RE: Free modification
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Message:
Accually when i measured vaccuum at idle from both the map port and the tee i installed,it was the same. When i bilped the throttle vacuum from the tee dropped much quicker than vacuum from the map port. I have stock heads and cam and i swear the increase in power is as good as any single modification i have made to the truck, and a hell of alot cheaper.....
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Troy
Dodge Dakota
12/06/2001
13:32:51
| RE: Free modification
IP: Logged
Message:
Bill Good,
Can you give me the web address for Delphi R/T: I would like to see this forum. I did this modification, but I'm not sure if it works on mine, or not. I haven't had a chance to drive it yet. I found an easier way to do this, however. I completely removed the hose that was hooked to the map sensor. Then you can just hook the new hose from the brake booster, into the elbow where the factory hose was connected on the check valve. Just rotate that elbow and hook the new hose. It is a much cleaner looking installation, than leaving that factory hose hooked up backwards, and pointing to the front of the truck. This also makes the mod cheaper, because it requires less parts. You can do it with one 3/16" cap, one 1/4" tee, one 1/4" - 1/4" connector, and app. 8-10" of 1/4" vacuum line. The 1/4" - 1/4" connector makes hooking the new hose from the tee easier to hook up to the check valve. Use the factory short piece of hose that comes on the check valve. I went ahead and bought 2' of line, as well as the other stuff, but did not need the extra foot of line or the 1/4" - 3/16" reducer. Hope this helps anyone else that is going to try this.
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conig
Dodge Dakota
12/06/2001
14:43:19
| RE: Free modification
IP: Logged
Message:
how would you go about doing this on a 4.7?
since the map sensor is at the front of the manifold on a 4.7l did dodge sort of already apply this theory to the 4.7l engine?
if some one points out were the map is on the 4.7 and how I would try something like this I will do it and give results from butt dyno, driveability, throttle responce, etc.
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Troy
Dodge Dakota
12/06/2001
17:41:09
| RE: Free modification
IP: Logged
Message:
Just went and drove my truck. This mod did not work!!! It did not help responsiveness at all. It made the truck detonate (ping) very bad. I am running 89 octane, as well. It was pinging extremely harsh. It also made the truck not shift correctly. It was like the truck was winding out, when only at part (half) throttle. This mod may benefit some owners, but it was a definite waste of $8 for me.
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b. good
Dodge Dakota
12/06/2001
17:43:34
| RE: Free modification
IP: Logged
Message:
Troy,dakota r/t club http://www.dakotart.com or http:www.dakotart.com/index2.htm to go straight to delphi r/t forums.
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b. good
Dodge Dakota
12/06/2001
17:48:56
| RE: Free modification
IP: Logged
Message:
If you installed your tee above the check valve your truck won't run right. must go to manifold vacuum, try again.
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toast
Dodge Dakota
12/06/2001
19:16:01
| RE: Free modification
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Message:
Well i used a spot on my manfold on the passenger side that was not in use and connected the MAP there plus while i was under there i reloctaed my IATsensor to the air cleaner. I did notice a slight increase in power mostly in the upper revs where my truck was lacking alittle.
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Troy
Dodge Dakota
12/06/2001
20:38:52
| RE: Free modification
IP: Logged
Message:
I installed it the way that you said, as far as I can tell. If you don't care, explain exactly where you put your tee, and I will try it again. Maybe I did screw up somewhere, but I don't think so. I let you know if anything changes, after trying it again.
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Troy
Dodge Dakota
12/07/2001
17:46:55
| RE: Free modification
IP: Logged
Message:
Bill Good,
I just did this mod to my truck again. I made a mistake the first time around. I was major tired, and wasn't thinking clear. Anyhow, it seems to have helped responsiveness, slightly. I have just drove it around town, though. I have to make a short trip on the highway late tonight, and then I can see if the detonation and erratic shifting problem is cured. So far, it is not a bad mod. I will let you know what happens on the highway trip. Thanks for posting this cool modification.
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Troy
Dodge Dakota
12/08/2001
09:59:52
| RE: Free modification
IP: Logged
Message:
Worked fine on the highway, as well. Good mod, for cheap.
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Troy
Dodge Dakota
12/08/2001
10:00:24
| RE: Free modification
IP: Logged
Message:
Worked fine on the highway, as well. Good mod, for cheap.
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Troy
Dodge Dakota
12/08/2001
10:00:43
| RE: Free modification
IP: Logged
Message:
Worked fine on the highway, as well. Good mod, for cheap.
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Troy
Dodge Dakota
12/08/2001
10:01:01
| RE: Free modification
IP: Logged
Message:
Worked fine on the highway, as well. Good mod, for cheap.
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bernd
*GenIII*
12/08/2001
10:23:07
| RE: Free modification
IP: Logged
Message:
Unless you actually understand what you're changing with the different MAP sensor output, you really don't have to move it at all.
Factory reading at the MAP port is 11-12" vacuum. Factory manifold vacuum is 15-17" vacuum. More vacuum = less fuel = lean mixture.
The signal does change slower...but for a reason on the MAP port.
1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.93 @ 93.26mph
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bernd
*GenIII*
12/08/2001
10:23:29
| RE: Free modification
IP: Logged
Message:
Unless you actually understand what you're changing with the different MAP sensor output, you really don't have to move it at all.
Factory reading at the MAP port is 11-12" vacuum. Factory manifold vacuum is 15-17" vacuum. More vacuum = less fuel = lean mixture.
The signal does change slower...but for a reason on the MAP port.
1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.93 @ 93.26mph
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B. GOOD
Dodge Dakota
12/08/2001
18:24:59
| RE: Free modification
IP: Logged
Message:
When I first hooked this up semi dark garage- did't notice manifold port on passenger side. Better place to hook up- dont have to cut anything and closer to map sensor. Explained this change of vacuum to a friend who is a drivability mechanic at a ford dealer and he says this modification accually richens it up a little bit. Overhead says I'm getting 1/2 mpg less so far. Had to make a slight t. v. cable adjustment ,semmed to be shifting a little to soon around 3/4 throttle.
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bernd
*GenIII*
12/08/2001
20:03:32
| RE: Free modification
IP: Logged
Message:
When you set the vacuum on the MAP to a higher (numerically) signal, you lean it out. Unfortunately, the signal on manifold vacuum is quicker so, yes...a side effect could be worse gas mileage.
1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.93 @ 93.26mph
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Docs.RT
Dodge Dakota
JOIN HERE
1/28/2002
16:55:00
|  Air intake kit
IP: Logged
Message:
Hey i have a 2000 Rt club cab and im not much of a
guy who works on cars. I have started to do little
things and i am gonna put in a air intake kit and
i need ideas. I like the KN Gen II but it doesnt
give a nice appearence, airaid doesn't get ride of
the factory hose, and I went to
Intenseperformance.com and it seems since there is
no filtercharger on top that it will suck all the
dirt into my engine.PLease give me ideas on what
to do and can anyone tell me what they used and
how it increased performan
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Docs.RT
Dodge Dakota
JOIN HERE
1/28/2002
16:57:43
| Air intake kit
IP: Logged
Message:
Hey i have a 2000 Rt club cab and im not much of a
guy who works on cars. I have started to do little
things and i am gonna put in a air intake kit and
i need ideas. I like the KN Gen II but it doesnt
give a nice appearence, airaid doesn't get ride of
the factory hose, and I went to
Intenseperformance.com and it seems since there is
no filtercharger on top that it will suck all the
dirt into my engine.PLease give me ideas on what
to do and can anyone tell me what they used and
how it increased performan
|
Docs.RT
Dodge Dakota
JOIN HERE
1/28/2002
17:07:13
| Air intake kit
IP: Logged
Message:
Hey i have a 2000 Rt club cab and im not much of a
guy who works on cars. I have started to do little
things and i am gonna put in a air intake kit and
i need ideas. I like the KN Gen II but it doesnt
give a nice appearence, airaid doesn't get ride of
the factory hose, and I went to
Intenseperformance.com and it seems since there is
no filtercharger on top that it will suck all the
dirt into my engine.PLease give me ideas on what
to do and can anyone tell me what they used and
how it increased performan
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Anthony G
Dodge Dakota
JOIN HERE
1/28/2002
17:42:08
| RE: Free modification
IP: Logged
Message:
Does this hose run from the Map sensor to the brake booster that shared into the line that goes to the intake? If so, could I remove it and place it directly into my M1 manifold where it has an extra four places for hoses? I just stop up the booster hole with a rubber stopper that currently on the M1. I haven't looked yet, because I'm still at work. I really don't need any extra throttle response, just a better MAP reading. I might try it out just to see if it help anything.
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b good
Dodge Dakota
JOIN HERE
1/28/2002
19:01:54
| RE: Free modification
IP: Logged
Message:
Anthony g. If your installing the m-1 you have to run the big hose to your brake booster or you'll have no power brakes. To do map sensor vacuum modification its simple enough. Just run a vacuum hose from one of the small nipples on the side of your m-1 and attach it to the rubber elbow under your map sensor{explained earler post on this subject] Make sure you cap the original map port{and any others on the manifold you don't use.
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