Underdrive pulley question gen 3 & 4

[Revolution]

If anyone has a belt part number they use for Gen IV AC cars let me know. The one I pictured above is the one people use for the Gen III's. Everything should be the same but I'll give JTS a call today and see if they have a different part number they use on the Gen III's with AC.

Andy

Is the belt to long or too short?

[FLATOUT]

Is the belt to long or too short?

Seems a touch short, but it was really cold in the garage, it was a brand new belt, and is probably a few years old. It is the correct part number from Mopar for Gen 3's with AC. I have a shorter belt that is meant for the comp coupes without AC. If this belt was about an inch longer it would have been perfect.

I'll try to pop it on tonight. All of the pulleys are the same diameter on the Gen 3 and 4 correct?

[FrgMstr]

I have been watching this Flatout. If this works this a must do mod for sure. Keep us posted brother!

[FLATOUT]

I have been watching this Flatout. If this works this a must do mod for sure. Keep us posted brother!

Will do, let me get the proper belt worked out for you guys, and then buy away lol.

[Revolution]

Will do, let me get the proper belt worked out for you guys, and then buy away lol.

Do you have a good baseline to compare it to once the belt is on?

[FLATOUT]

Do you have a good baseline to compare it to once the belt is on?

I have more dyno's than I care to share lol.

[Revolution]

I have more dyno's than I care to share lol.

Perfect since a small increase like this is in the range of dyno to dyno variance.

[FLATOUT]

Perfect since a small increase like this is in the range of dyno to dyno variance.

I'll make a pull with it in a few weeks, on the same dyno SAE corrected that has done all of my pulls.

[Getnlwr]

I have ViperGirls Pulley/belt on the way. It'll give me something to do next weekend.

[Colo08]

The SRT Under drive pulley is available from Parts Rack or IPSCO DSC02689.JPG

[FLATOUT]

Guys I got mine on and fired up this morning, zero issue, and no check engine light after about a 4 mile drive. I talked to my buddy that ran it on his gen IV coupe and he ran the stock factory belt with his, for quite a few miles with no problems.

I slapped my stock serpentine belt on and it ran great.

[SSGNRDZ_28]

Great, thanks. So will the stock belt work as a permanent solution or is it still too long?

So no issues whatsoever? Did your buddy have the Mopar ECU?

[Troublemaker]

How much does this under drive the accessories? I only ask as I have the 10% on my car now and have the 15% pulley also. This is on a Gen2, so it's a different animal, but I was just curious if anyone knew.

[Revolution]

How much does this under drive the accessories? I only ask as I have the 10% on my car now and have the 15% pulley also. This is on a Gen2, so it's a different animal, but I was just curious if anyone knew.

Didn't do the hard math but looking at the diameters he posted I'm assuming around 17-18%

[Getnlwr]

5.72 OE, and 4.61 UDP, puts the pulley at 80.59% of stock. Running an under drive of 19.41.

[Troublemaker]

5.72 OE, and 4.61 UDP, puts the pulley at 80.59% of stock. Running an under drive of 19.41.

Thanks

Revolution, heck of a guess.

[FLATOUT]

All I know is stock belt is working fine on my car. Put a few miles on it no problem today. Tomorrow will be a better test

[Getnlwr]

Mine showed up today, and shall be getting installed tonight.

Flatout, have you been able to put more miles on it without issues?

[FLATOUT]

Mine showed up today, and shall be getting installed tonight.

Flatout, have you been able to put more miles on it without issues?

Yes I put about 70 miles on the car last Saturday with wide open runs from 60-150+ and everything worked great! Zero issues. My car does have the Mopar ECU, and the other Gen IV I know that was running one also ran a Mopar ECU.

[Getnlwr]

Sounds good! Thanks Andy

[ACRucrazy]

Is it essentially the same as this one? Any changes to the Gen IV that would keep this from working? I'm willing to be the guinea pig if no one knows for sure.

http://shop.jtsvp.com/product.sc?pro...categoryId=206

Looks like he raised the price. $229

[Viper Girl]

I didn't read every post in here, but did anyone find out what quality of Alum that pulley which is now $229 is made of? T-6 or?

[FrgMstr]

I just sent JonB a note to ask if he could throw this one in on my current order.

http://www.viperpartsrack.com/underd...keyword=pulley

[FLATOUT]

I have the Mopar one but the JTS Venom unit is on the way, I want to make sure that one will bolt up as well. I should have that one by the end of the week.

- - - Updated - - -

And on a side not $229 is cheap for a no hassle 10rwhp.

[SSGNRDZ_28]

So are there 4 versions? Mopar, JTS , IPSCO, PartsRack? Any differences?

FLATOUT, I really appreciate all of the posts and effort going into testing all of this and the other projects. Thanks.