LOST JEEPS
http://www.lostjeeps.com/forum/phpBB3/

Provent or EHM any efficiency gain? Map sensor...
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=83340		 Page 1 of 1
Author:  Mountainman [ Mon Oct 26, 2015 12:51 pm ]
Post subject:  Provent or EHM any efficiency gain? Map sensor...
Just my latest random thought. Is there any evidence that the light coating of oil on the MAP sensor makes any difference in its ability to make its various measurements? If there isn't, then the only real gain is not having rotten hoses?
GDE/Keith runs his CRD's in the stock config right?

Thanks for any insight.
Author:  Yeti [ Mon Oct 26, 2015 1:49 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
I think can not affect the air temp/pressure reading , and I think can clean the intake dissolving the previous mixture created with the egr
Author:  xhizzous [ Mon Oct 26, 2015 2:16 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
Main issue is probably the rotten hoses and not having the inter cooler get a lot of oil in it/ tar on intake after the egr.
Author:  flash7210 [ Mon Oct 26, 2015 2:17 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
The MAP sensor works just fine with light coating of oil.
The problem is when EGR soot combines with that oil.
So as long as you EGR is disabled the MAP will be fine.

Yes, the oil from CCV can cause your intake and boost hoses to rot.
But what about the intercooler? What does that fine coating of oi do to the efficiency of the intercooler? Will the intercooler slowly fill up with oil?
I have no idea.
Author:  Mountainman [ Mon Oct 26, 2015 4:37 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
ok, thanks for the responses. From what I've seen, there isn't a major build up of oil in the IC. I've also seen a stock configuration with the EGR deleted get nearly 40 mph at 65 on the freeway, so I think I'm happy with it as is. And, since (Flash I think?) has found a cheap replacement for the airbox to turbo hose, rotten hoses aren't an issue any longer. I bought a Provent, but I'm thinking it will just be added crap under the hood that really isn't necessary. I'm just going to replace the CCV puck every 100k or so for insurance that my NEW main seal holds up. If anyone knows how long the CCV pucks last before the flapper fails that would be awesome info.
As for IC effiency with oil in it, I can't imagine a stock tune doing much better than 40 mpgs, so I'm not worried about it. The oil also has the added advantage of telling you when your cheap plastic IC has a tiny leak, too small to register a code, or to notice otherwise. Ask me how I know :furious: :banghead:
Author:  flash7210 [ Mon Oct 26, 2015 5:00 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
Since I have made a new turbo inlet pipe, I have been running the EHM because I don't yet have a place to attach the CCV hose.

I don't think the CCV can really fail. Inside is a spring and a rubber flap. The spring holds the flap open. The only reason I replaced mine was because I broke the plastic outlet.

I don't see anything wrong with the EHM.
Yes, it vents some visible vapors.
Yes, it will drip oil on my driveway.
Will it freeze up in winter?
I don't know. I live in Florida. The only place I ever see ice is in my freezer.
One day I will install a provent but I'm in no hurry.

I don't know how some folks are getting 40 mpg. They must be reading off the evic. Best I ever saw was 31 mpg during a long trip.
Nowadays I'm lucky to get 25 mpg.

Are you absolutely sure you have a rear main leak?
I thought I had a rear main leak. Even bought a new seal.
Never installed it though because after I replaced my turbo oil drain pipe and seal the oil leak stopped.
Author:  ATXKJ [ Mon Oct 26, 2015 6:35 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
EHM stinks... smells like used oil all the time

Provent -doesn't smell
Author:  WWDiesel [ Mon Oct 26, 2015 9:22 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
There are some valid reasons not to perform or run the EHM mod,
If you want to read the thread that covers in technical detail the problems caused by lack of vacuum on the CCV system? (EHM)
viewtopic.php?f=5&t=80491&hilit

I too first did the EHM but then installed a ProVent system when this information surfaced last year.
Live and learn!!! :wink:
Author:  MM53 [ Mon Oct 26, 2015 10:22 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
I have ran the EHM for over 55k all good
Author:  rankom [ Mon Oct 26, 2015 10:35 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
i did ehm (home depo special) 1/2 '' copper pipe plumbed into frame pass side area , look like umbrella style so the oil can not leak on driveway but does smoke a bit , i have no issue with it
Author:  mikey1273 [ Tue Oct 27, 2015 8:21 am ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
I have had the Provent on mine since just over 40,000 miles, I'm now near 109,000 and had GDE tune since around 50,000 miles. I pulled My MAP sensor once a few years ago and it was really not dirty at all, not like it was when I cleaned it after I did the provent install. It never smells and no mechanics ever question it not even the dealership, one actually knew what it was and why it was there.

It does collect a few ounces of oil every oil change. Other than that I never have to mess with it and it never stinks. it doesn't get all the oil my intake still has a slight film of oil but it does collect most from what I see.
Author:  mass-hole [ Tue Oct 27, 2015 12:28 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
flash7210 wrote:
Since I have made a new turbo inlet pipe, I have been running the EHM because I don't yet have a place to attach the CCV hose.

I don't think the CCV can really fail. Inside is a spring and a rubber flap. The spring holds the flap open. The only reason I replaced mine was because I broke the plastic outlet.

I don't see anything wrong with the EHM.
Yes, it vents some visible vapors.
Yes, it will drip oil on my driveway.
Will it freeze up in winter?
I don't know. I live in Florida. The only place I ever see ice is in my freezer.
One day I will install a provent but I'm in no hurry.

I don't know how some folks are getting 40 mpg. They must be reading off the evic. Best I ever saw was 31 mpg during a long trip.
Nowadays I'm lucky to get 25 mpg.

Are you absolutely sure you have a rear main leak?
I thought I had a rear main leak. Even bought a new seal.
Never installed it though because after I replaced my turbo oil drain pipe and seal the oil leak stopped.

I've never understood the freezing thing. At least in my case I am running a 3/4" id fuel hose and it wraps over the top of the engine and down the drivers side of the block and then follows the fuel lines down the drivers side terminating somewhere under the drivers seat/footwell. It never has more than a little bit of oily fluid pooled at the base of the hose where it levels off. Even if that fluid did freeze, 95% of the cross section of the hose is open and its very rapidly going to heat up from the gas flowing through it and the heat from being attached to the engine block.

Sent from my Nexus 6 using Tapatalk
Author:  Mountainman [ Tue Oct 27, 2015 1:20 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
Flash, as for the 40mpg. I was on level highway with low rolling resistance tires, stock sagged out suspension, cruise control set, and this 40 was only for the highway trips. I was able to average just over 30 with that same CRD, and that was some city, and a good bit of rocky mountain off-roading. But, then again, I was driving like a grandma and never exceeding 65 mph.
I am fairly certain that it's my main seal as I checked for turbo leaks, and I replaced the turbo and all seals 20k ago. Luckily I'm dropping the transmission anyhow for the Hemi TC, so at least I'm already in there. I have the factory tools, so hopefully the main seal will be easy to do for a first timer:/

WWDiesel, thanks for the reminder! I reread that thread and now remember why I bought the Provent in the first place :5SHOTS: The EHM is a terrible idea and I'm pretty sure it lead to my main seal failure. We need that slight vacuum as the thread explains... I seriously doubt the seal will last 300k miles or more with the EHM. I lost mine in 15k with a good bit of heavy towing.
Author:  mass-hole [ Tue Oct 27, 2015 4:31 pm ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
Mountainman wrote:
Flash, as for the 40mpg. I was on level highway with low rolling resistance tires, stock sagged out suspension, cruise control set, and this 40 was only for the highway trips. I was able to average just over 30 with that same CRD, and that was some city, and a good bit of rocky mountain off-roading. But, then again, I was driving like a grandma and never exceeding 65 mph.
I am fairly certain that it's my main seal as I checked for turbo leaks, and I replaced the turbo and all seals 20k ago. Luckily I'm dropping the transmission anyhow for the Hemi TC, so at least I'm already in there. I have the factory tools, so hopefully the main seal will be easy to do for a first timer:/

WWDiesel, thanks for the reminder! I reread that thread and now remember why I bought the Provent in the first place :5SHOTS: The EHM is a terrible idea and I'm pretty sure it lead to my main seal failure. We need that slight vacuum as the thread explains... I seriously doubt the seal will last 300k miles or more with the EHM. I lost mine in 15k with a good bit of heavy towing.


I mean I had seen 37mpg post GDE tune and on the factory tires/suspension. This was on the EVIC's and I believe hand calculated it came out to like 36.3 mpgs or something.

I have no clue what I'd get now with an all highway drive. I went from stock goodyears to 265/70-16 Duratracs and never had the speedo corrected because its actually more accurate with these new tires than it was on the factory tires. This means the EVIC's would show worse mpg's than it had before since the tires are now spinning slower for the same actual speed. It still averages 25-26 according to the evics in its current form(2.5" lift, duratracs, arb bumper.) It was averaging 28-29 when stock.
Author:  Mountainman [ Wed Oct 28, 2015 10:57 am ]
Post subject:  Re: Provent or EHM any efficiency gain? Map sensor...
Yeah, my goal is still to average 30 with my lift and 245/70's. I think I'm going to try the michelin AT's, which aren't very aggressive, but I think they'll get me around well with lockers, at least when there's no snow. Probably need chains in the snow anyhow...
Page 1 of 1 All times are UTC - 5 hours [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/