So I have searched the forum about the pulley choices for the STR. I may be getting ahead of myself since I haven't bought the car yet but I like to do the research beforehand. There is the 1.5 lb and the 3.0 lb pulley available. My question is how do these compare to the 03/04 Cobra pulleys. I know most guys get the 2.8 and 2.7 inch pulleys on the Cobra. What size are the 1.5lb and 3.0lb pulleys and what size is the stock pulley on the STR? I could not find this information when searching the forum...

 

Since ford pulleys are about half the cost of the Jags, I was wondering the same thing but bought the Jag pulley based on a deal being sold by a fellow member...I assumed the belts/depth of the pulley were different...I heard Ford used a "keyed" shaft where Jag didn't but I never verified this...Looking on ebay at Ford pulleys, pictures which I can't confirm are the actual item being sold as they could be using stock/generic photos are un-keyed like the jag. So, you need to confirm that it's unkeyed, the depth is correct & the grooves will match the Jags belt...

 

How hard was it to install the 3lb pulley, I am a little scared of grinding down the blower snout... how big of a difference did it make?

 

I paid a shop $300 to install it...Most say it's about a 50hp difference...It puts a lot of hot air into the engine so understand, the car is much different at 80f (slower) than at 40f (faster)...I repeatedly post I regret my pulley decision and wish I went for cold air nitrous, but I'd take too much of loss to switch...

 

I have a 125 wet shot on my current car right now and it's been a pain to get dialed in. Don't think I will go that route again. Plus I have a 15lb bottle and it still goes through it quick, especially for 1/4 mile runs.

 

05strjag, the STR blower w/stock pulley puts out on or about 13 lbs. boost. It's stock pulley is noticeably smaller than that of the Cobra, which if memory serves me correct, produced 8 lbs. boost in stock configuration. The 3 lb. pulley (16 lbs. boost?) is wonderful. My 03 STR has a K&N a/f, modded (Mafioso) air intake tube, low temp. thermostat, and hi-flow cats. These mods both allow her to inhale/exhale much more efficiently and lower block and intake temps. 80 F. days allow up to an hour of fun whilst 60 F and lower afford a few hours of fun before heat soak sets in. A "Chiller Killer", mister, or methyl/alky kit solves heat soak before runs. I don't regret the 3 lb. pulley. The low end to midrange hp and trq. is amazing...an entirely different car. I'm guessing she puts out nearly 460 chp @ 500 lb/ft trq. IMO, go for it.

 

What car? Define "dialed in"...The STR, like most late model performance cars has a wide-band O2 sensor which eliminates "dialing in"...Cooling the engine down is almost as important as nitrous itself...I often drive to work in 40f and drive home in 80f temps and I swear, my butt dyno makes it feel like a 100hp difference even though that's not the case...

 

Bacardi151, you have the 3 lb. pulley. You're almost there bro. All you'll need is a: low temp. thermo, Mafioso intake air elbow, hi-flow cats, and x-pipe... With this performed, the only time you'll need nitrous is in the dentists office.

 

I think I'm on to you...You're an undercover agent trying to get me a driving to endanger/reckless driving offense, aren't you?

 

LOL! Ok. So you figured me out? The performance mods must've gave me away? Come in now and you'll recieve immunity from prosecution for speeding, not to exceed 155 mph.

 

Just because a car has a wide-band 02 sensor doesn't meant you don't need a tune when running nitrous. You have to retard the timing and make sure the A/F ratio is where it's supposed to be even with a wet shot. I have a 1998 Mark VIII LSC with the 4.6 DOHC, I have converted to a ported Cobra intake manifold and have 4.30 rear gears, toyo drag radials, custom tune, high flow fuel pump, full exhaust etc. It surprises a lot of cars but I don't like that the nitrous goes quickly. It's a pain to continuously have to refill.

 

My bad that I didn't completely explain...Long story short, there's never an one size fits all when it comes to nitrous...There are different size shots, a RPM window switch and a lot of kits now use a progressive shot so you don't just get a 100% shot; instead it starts at 10% and increases with the rpms...The moral of the nitrous story is to "tune" your nitrous kits RPM windows and flow % on the dyno while monitoring AFRs...As it stands, there doesn't appear to be any ECU STR dyno tuners (only mail in companys), so you're stuck with your AFRs and need to tune the nitrous variables to the ECU...

 

05strjag, you made a mark V111 into a street machine? You and Bacardi are very sick men. That you guys take totally unknown luxo-cruisers to the street is purely dementia. I luv it! A rare breed indeed....

 

Gotta love a sleeper. I like to see unique cars at the track hauling ***. Everyone knows a Cobra or Evolution or STI are fast, no fun in that... plus you will have the same setup as everyone else. One of the reasons I am looking at the STR... there was a guy here at the local track who used to run an older supercharged JAG, I think it was an XJR, he had a pulley, an insulated cold air intake and some drag radials and would run high 12's...

 

With just a catback I hit a 13.2, and another member here (1320racer) has hit 12.9 stock.

 

Just a catback, no x pipe? Impressive...

 

You'd love the modest increase in hp and trq he mods do for the STR...an entirely new personality. I'm no longer afraid of late model metal. In fact, they have more to be afraid due to her superior hp and trq.

 

I believe 1320racer originally had a clogged cat and replaced it with a high flow but was otherwise stock...Also, in the interest of thoroughness, he lowered the air pressure in his tires, removed the spare tire and other items for lightening and iced down the block. Point being if you roll up to him at a stoplight, it's going to be a tad slower...Still a very impressive time!

He actually said:

 

Mike and STRracer did a wonderful job showing the STR's capabilities...Bacardi you're up next...hi-flow cats, x-pipe, and 3 lber son.