Underdrive pulley question gen 3 & 4

[FLATOUT]

And why the hell not?!

Good question

[steve911]

Whats the part number and the cost for the comp coupe pulley?

[FLATOUT]

P4510177 Underdrive Crank Pulley (2003–05 Viper SRT10) $331.00

Steve just pulled that off a randon site.

[IndyRon]

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

[Getnlwr]

Yes, as so far stated the one from Tony and JTSVP would fit, as well as the one from Jon B at parts rack.

[Black Pearl]

$160 from JTSVP is a great price for the pulley, hardware and belt. If it will not work on the Gen IV, you can sell to someone with a Gen III.

[FLATOUT]

My only question is if these work why haven't Gen IV guys been running them? And if someone told you they would'nt work did they say why?

Should have mine by the weekend so I will get it on and report back.

[Revolution]

Great find in for more info, and some dyno results!

[slowhatch]

I've always worried about under-driving the accessories with these and creating problems at low rpm with the charging system, and maybe even the water pump. Also worried about changing the weight on the crank (isn't it counterbalanced with a set damper/crank pulley weight?).

[Getnlwr]

My only question is if these work why haven't Gen IV guys been running them? And if someone told you they would'nt work did they say why?

Should have mine by the weekend so I will get it on and report back.

Only reply I got was... "Totally different motor." Thread here...

Also makes me wonder if a paxton will fit with just a change on the intake to throttle body. Or ideally the JMB procharger kit works with some massaging.

http://forums.viperclub.org/threads/...-pulley-Gen-4.

[Steve M]

I've always worried about under-driving the accessories with these and creating problems at low rpm with the charging system, and maybe even the water pump. Also worried about changing the weight on the crank (isn't it counterbalanced with a set damper/crank pulley weight?).

I'd highly doubt it...easy way to tell would be to see if the pulley was clocked/marked/keyed. I've never looked at mine that closely.

[Steve M]

Only reply I got was... "Totally different motor." Thread here...

Also makes me wonder if a paxton will fit with just a change on the intake to throttle body. Or ideally the JMB procharger kit works with some massaging.

http://forums.viperclub.org/threads/...-pulley-Gen-4.

Fitting a Paxton wouldn't be a huge hurdle...it's always been a calibration issue since no one (until very recently) has been able to hack the PCM. Stand alone systems have just been too pricey.

Although I'm not sure the Venom controller would be able to support any decent amount of boost unless you could alter the MAP calibration to accept a 2-bar sensor.

[Getnlwr]

Time will tell. Was told by someone even 4PSI on the stock motor could be a good 800+hp at the crank.

[Troublemaker]

Time will tell. Was told by someone even 4PSI on the stock motor could be a good 800+hp at the crank.

That's amazing, you would think with the parasitic draw of the blower that the number wouldn't increase that much. I think these cars have a lot of untapped potential if that is accurate.

[Revolution]

Most problems I've seen with UR pulleys are in applications it replaces the balancer itself, which isn't the case in this application.

[FLATOUT]

Well mine arrived so I'll test fit soon

[SSGNRDZ_28]

Well mine arrived so I'll test fit soon

Great keep us updated and thanks for testing it!

[Viper Girl]

I have a black billet underdrive pulley that has been sitting in a box in my garage. It is the lightweight one that Parts Rack sells for $249.

Just listed it in the classifieds if anyone is interested.

[FLATOUT]

Got the pulley on tonight no problem, but the belt was being less than cooperative, I will tackle that tomorrow.

[ACRucrazy]

Good stuff. I ordered one of those JTSVP pullies last night. I am going to have a pile of crap to install this spring.

[FLATOUT]

Good stuff. I ordered one of those JTSVP pullies last night. I am going to have a pile of crap to install this spring.

Lol my new headers and catback shipped today . You and me both. Move to Texas so you can drive that thing now

[ACRucrazy]

Lol my new headers and catback shipped today .

[Viper Girl]

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

The pulley in the link doesn't say T6061 T6... Hate to quote Wiki, but there seems to be at least 3 different T6061 aluminiums. I would check to see what this pulley is made from.

Mechanical properties[edit]

The mechanical properties of 6061 depend greatly on the temper, or heat treatment, of the material.^[2]Young's Modulus is 10×10⁶ psi (69 GPa) regardless of temper.^[3]
6061-O[edit]

Annealed 6061 (6061-O temper) has maximum tensile strength no more than 18,000 psi (125 MPa), and maximum yield strength no more than 8,000 psi (55 MPa). The material has elongation (stretch before ultimate failure) of 25–30%.
6061-T4[edit]

T4 temper 6061 has an ultimate tensile strength of at least 30,000 psi (207 MPa) and yield strength of at least 16,000 psi (110 MPa). It has elongation of 16%.
6061-T6[edit]

T6 temper 6061 has an ultimate tensile strength of at least 42,000 psi (300 MPa) and yield strength of at least 35,000 psi (241 MPa). More typical values are 45,000 psi (310 MPa) and 40,000 psi (275 MPa), respectively.^[4] In thicknesses of 0.250 inch (6.35 mm) or less, it has elongation of 8% or more; in thicker sections, it has elongation of 10%. T651 temper has similar mechanical properties. The typical value for thermal conductivity for 6061-T6 at 80°C is around 152 W/m K. A material data sheet^[5] defines the fatigue limit under cyclic load as 14,000 psi (100 MPa) for 500,000,000 completely reversed cycles using a standard RR Moore test machine and specimen. Note that aluminum does not exhibit a well defined "knee" on its S-n graph, so there is some debate as to how many cycles equates to "infinite life". Also note the actual value of fatigue limit for an application can be dramatically affected by the conventional de-rating factors of loading, gradient, and surface finish.

[Victxv10]

The pulley in the link doesn't say T6061 T6... Hate to quote Wiki, but there seems to be at least 3 different T6061 aluminiums. I would check to see what this pulley is made from.

I sent JTS an email asking if it was T6 and if they have heard any Gen4 owners using it. I'll let you know what they say.

[FLATOUT]

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