saw this on WIKIPEDIA , anyone know for sure about having a different pulley set up? i know the 03 HP listing is 390 but you see later models listed at 400... plus i think 05 and up has the speedo that goes up to 170 while the 03-04 stops at 150

wikipedia quote
"Later models of the S-Type R featured a revised pulley system for the Eaton M112 supercharger, allowing it to produce an extra 20 hp (15 kW; 20 PS)."

 

It's an error. There are detailed threads on here pointing it out but I guess no-one bothered to edit wiki page.

The pulley was changed as per a TSB you can read on here to reduce noise. No change in power.

BTW, the original goes dial up to 160mph and the car is in any case limited to 155 I believe - not that you have a realistic chance to get these cars up to that speed.

 

ok, good i didn't want to waste money on a pulley change if it was the same...

 

The introduction of the VVT system is where the extra 10 HP came from.

 

There was also an industry change around that time, in which the SAE standard for measuring hp differed slightly; subsequently all the OEM's revised power outputs of their engines to reflect the new standard.

If you want to increase the boost, buy an aftermarket smaller pulley. 1.5lb or 3lb are available.

 

Here is what happened:




A few manufacturers such as Honda and Toyota switched to the new ratings immediately, with multi-directional results; the rated output of Cadillac's supercharged Northstar V8 jumped from 440 to 469 hp (328 to 350 kW) under the new tests, while the rating for Toyota's Camry 3.0 L 1MZ-FE V6 fell from 210 to 190 hp (160 to 140 kW). The company's Lexus ES 330 and Camry SE V6 were previously rated at 225 hp (168 kW) but the ES 330 dropped to 218 hp (163 kW) while the Camry declined to 210 hp (160 kW). The first engine certified under the new program was the 7.0 L LS7 used in the 2006 Chevrolet Corvette Z06. Certified power rose slightly from 500 to 505 hp (373 to 377 kW).

While Toyota and Honda are retesting their entire vehicle lineups, other automakers generally are retesting only those with updated powertrains. For example, the 2006 Ford Five Hundred is rated at 203 horsepower, the same as that of 2005 model. However, the 2006 rating does not reflect the new SAE testing procedure as Ford is not going to spend the extra expense of retesting its existing engines. Over time, most automakers are expected to comply with the new guidelines.

SAE tightened its horsepower rules to eliminate the opportunity for engine manufacturers to manipulate factors affecting performance such as how much oil was in the crankcase, engine control system calibration, and whether an engine was tested with premium fuel. In some cases, such can add up to a change in horsepower ratings. A road test editor at Edmunds.com, John Di Pietro, said decreases in horsepower ratings for some '06 models are not that dramatic. For vehicles like a midsize family sedan, it is likely that the reputation of the manufacturer will be more important.[21]



Changing the pulley will definitely give more power along with more heat and will put the car into heat soak sooner. Just use an aftermarket pulley. There are several different sizes.
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Sorry, but no. No increase.

 

I wanna do the pulley, the 1.5 is the easiest....is it something i can do fairly simply in the garage.? hour or 2?

 

Depends on how good you are, how many tools you have etc. Getting the old one off is a royal pita.

What we usually do. Cut into the old pulley with a cutting wheel / grinder till you are about 3/4 of the way through. Be careful not to cut into the blower snout. Two slits at 10 o clock and two o clock. Then get out your air hammer and put in a chisel blade and have at it until it splits.


Once it's off pressing the new one on usually goes smoothly.

Take care,

George

 

Not really. I did my own pulley install and had a few issues including the installation tool breaking. Its a pretty rough job even if you know what you are doing; if I did it again I'd take it to a shop for the installation instead or pull the entire supercharger and send it out to have rebuilt at the same time.

 

I got the Mina 1.5 pulley as it was lighter and easier to fit. Also got a pulley removal tool from Eurotoys, cost about $100. Handed them to my indie, who is a Jag specialist, and asked him to fit the pulley.

Total time was 3 hours but, surprise, the OEM pulley was removed undamaged! Not that I have any use for it at the moment. Sold the removal tool to the indie.

At the start, my indie doubted that the new pulley would make any difference. Afterwards, he agreed that the STR definitely had more power.

 

ok, well i have plenty of tools to use, plus i run a plastic injection molding plant and can work on a variety of thing from injection molds to the presses themselves including hydraulics and electrical... i just heard that you needed to lift the motor a tad , and that i did not want to be involved in....thx for the info...plus my maintenance guy helps build races cars on the side so i think im set....

 

Lifting the motor was the easy part. Just a couple nuts on the bottom of the mounts and jack it up a few inches.

 

Which pulley for those of you who have them do you recommend? Mina? Eurotoys? Eurocharged?

 

so you do have to lift the motor to install?

 

Also how many pounds of boost do the STR's have stock? What's it go up to after pulley install?

 

OE 13psi I think.

 

13 stock so either 14.5 or 17 after the pulley

 

I have enjoyed the 3# Eurotoys, but I can't compare it to the 1.5# as I have only driven mine stock and with the 3# pulley. After 50+ trips down the 1/4 mile strip and >100 miles on a road course I don't have any complaints besides the extra heat generated, but I would imagine the engine would start getting warm even with the stock pulley when driven on a road course. It does make the install a little more difficult as you need to grind the snout of the supercharger for clearance, but it did make the most noticeable difference of all my power mods (not necessarily in peak power gained, but better gains through the whole power band).

Yes, but you don't need an engine hoist or anything like that. Just a floor jack and a block of wood after you undo the nuts on the bottom of the motor mounts.

 

I think you meant 14.5 or 16 .