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  #49  
Old 02-27-2013, 05:10 PM
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Re: Mods for the Adventurous Experimenters

Kevman, thanks for bringing it back up. I am at it again, and this reminded me of a few things.

4.whoa, I am starting to look at UD pulleys now and need some of your experience. The SLP, 847-100235 shows it needs a 6PK2025 belt. I see you used a 6PK2020 on yours. Is your pulley the same 25% UD as the one above? Also, since you changed your tensioner, did you pull the radiator (the worst part of the cam swap), or were you able to do it with everything (pull the front cover) in place. I am thinking that if I do the UD pulley I may as well advance the cam to 6 degrees while I am at it.....but I don't relish pulling the radiator/AC condenser again.

Also, since you've had the UD on for awhile now, what are your final assessments? Any improvement in fuel economy? Any battery/electrical/cooling issues because of the slower turning accessories? Thanks for your help.
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  #50  
Old 02-27-2013, 05:32 PM
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Re: Mods for the Adventurous Experimenters

im curious into this too, so what will happen if i were to advance the cams in the 3.7 one tooth? i can post the cam specs later on.
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  #51  
Old 02-27-2013, 07:44 PM
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Re: Mods for the Adventurous Experimenters

First, let me say that I've successfully advanced cams on 3 different vehicles, so I think (I hope) I can help a little in this regard. Before you do anything you should research the stock cam timing and see where it would be after you advanced it. You could compare it to a similar six cylinder vehicle that is a little more powerful. As an example, the unscientific way I did my first cam advance was when I did it on my 74 Nova six (see my post No. 36, this thread) I compared the timing to a Jaguar XKE, as both were in-line sixes, with the XKE putting out more power than the six cylinder "smog" motor. Advancing the Nova cam one tooth (count the number of teeth on the cam timing gear and divide by 360 degrees to find out how much one tooth is worth) made the timing nearly the same as the XKE, although the lift, durations, and other specs. were a little different. It worked out fine, and I think most would, since the manufacturers are fairly conservative. Also be sure to review this info. Technical Specs & Information to be sure you're going to accomplish what you plan to do. Remember, you'll also lose some top end power, but it should run quite a bit better on the low/mid RPM ranges if you advance it ~6-8 degrees. This is really just the "poor man's" way of getting a little more low end power, especially if no one makes a cam for your application.
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  #52  
Old 02-27-2013, 07:48 PM
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Re: Mods for the Adventurous Experimenters

Quote:
Originally Posted by jeepgcoman View Post
4.whoa, I am starting to look at UD pulleys now and need some of your experience. The SLP, 847-100235 shows it needs a 6PK2025 belt. I see you used a 6PK2020 on yours. Is your pulley the same 25% UD as the one above? Also, since you changed your tensioner, did you pull the radiator (the worst part of the cam swap), or were you able to do it with everything (pull the front cover) in place. I am thinking that if I do the UD pulley I may as well advance the cam to 6 degrees while I am at it.....but I don't relish pulling the radiator/AC condenser again.

Also, since you've had the UD on for awhile now, what are your final assessments? Any improvement in fuel economy? Any battery/electrical/cooling issues because of the slower turning accessories? Thanks for your help.
I used the summit C2515 it's 20% UD. with the belt i used my tensioner was just on the tight side of the center of the range


the only reason I pulled the radiator is cause i had trouble with the damper bolt threads.I had the tensioner and water pump done & the engine painted with it in.

Well, lets just say I REALLY enjoy driving this thing on the highway OMG! this thing is a beast! It is so easy to not realize how fast it is. I was bypass'n town on the hwy with it in 3rd (I keep it down in town)I hit it to get around traffic, and when i looked down it was @110!

I have not noticed my mpg's going up, BUT my 22's have short tires on them. I have had to change my batt this winter, but it was in the jeep when i got it and ive had it for 2+yrs. I have not had any cooling issues and we had alot of 100+* days this summer. I've driven it to NJ twice and also to MI in all types of weather.
I think that once I get some taller tires for my 22's (closer to stock height) , some taylor shorties (still have stock crap wires) & service the trans (a little past due) my mpgs should pick up (as long as my foot stays light
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  #53  
Old 02-27-2013, 08:05 PM
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Re: Mods for the Adventurous Experimenters

Thanks for the info. I have a couple more questions....is the Summit pulley aluminum or metal? How do you think the 25% UD would work, since your's is a 20%?
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  #54  
Old 02-27-2013, 10:17 PM
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Re: Mods for the Adventurous Experimenters

No prob
It's steel here's the link
http://www.summitracing.com/parts/sum-c2515

the 25% might spin up even quicker, but i dont know if it would be measureable,at least seat of the pants.
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  #55  
Old 02-28-2013, 12:10 PM
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Re: Mods for the Adventurous Experimenters

ive been looking at the ati 25% ud with the new damper for my 3.7, just waiting so i can pull the trigger on it
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  #56  
Old 02-28-2013, 07:48 PM
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Re: Mods for the Adventurous Experimenters

sorry for the noob Q' but what & how does the UD pulley affect performance ?
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Old 03-01-2013, 12:52 PM
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Re: Mods for the Adventurous Experimenters

Its about leverage. the smaller pulley is easier to spin- takes less effort/power. engine revs quicker due to less drag, but accesories spin slower. its fine on the street,but if you have a MONSTER system or do alot of crawlin or low speed 4wheelin , it might not be the best.
pic to compare:
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  #58  
Old 03-01-2013, 02:11 PM
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Re: Mods for the Adventurous Experimenters

So I'm interested in the SC tuner for the potential mpg gains and more MDS uptime (I do a decent amount of highway driving). I've really only done the OEM SRT8 intake mod with a drop in K&N filter and taylor shorties for performance. I can get 17-17.5mpg on the highway if I'm traveling with the wind at my back. You think the SC tuner with the engine/trans canned tunes will make a difference for me? I'm typically running 87 octane. Thanks in advance.
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  #59  
Old 03-01-2013, 08:00 PM
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Re: Mods for the Adventurous Experimenters

There is mileage gains to be realized in tuning.
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Old 07-09-2013, 04:42 PM
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Re: Mods for the Adventurous Experimenters

Well, let's revive this old thread!! I have now added the SLP 25% UD pulley and a BBK true 85mm throttle body. Neither of these mods. appear to make much difference using the "seat of the pants" method, so this past weekend I took both my Hemi LX (have just done the UD pulley on it so far) and Hemi WK to the races to see if there really is any difference. The WK had a previous best (corrected to sea level) time of 14.06 @ 97.340 mph and this time out had a best of 13.93 @ 96.57 mph. Times were really not as good as they could have been, as the best run was done with a density altitude of ~5410 ft., and the ambient temp. was ~90 degrees. The LX continues to be quicker/faster, but only from about 1000 feet on. Its best, this time out was 13.41 @101.02 mph. This is about right, as the LX (with the same mods) has pretty consistently been ~.5 seconds quicker than the ~600-700 lb. heavier WK.
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