Has anyone played around with changing the supercharger pulley to squeeze more power out of these things? I'm just curious because it is a pretty common thing in the Corvette world and I found a forum vendor that has them for sell.. Thought I might do this if it's worth it... Thoughts?




EDIT: I found my answer. The SEARCH Forum feature is your friend...... Thanks

 

Its been mentioned on here and a fairly detailed discussion of power per displacement, as well as compression level and stress ensued. I think there was also an insinuation that someone's engine pretty much melted due to a swap...

I think most of us are waiting until other braver souls make the swap and report back.

 

Whoever did the Hennessy tune and pulley upgrade has done this. 700hp+

 

Yes, they have not so much pulled the trigger as pulled the pin. Fun while it lasts though, I'm sure.

 

As discussed before in a previous thread; the V8 isn't under nearly the same pressure or stress as the V6 engine, onebecause it is lower compression and two because it is quite a bit less horsepower per liter. The V6 engine is what we're worried about boosting.

 

The hennesey tune and pulley change was only 620bhp irc

 

I had ETG do the pulley and tune 2000 miles ago and a fair share of those were of the spirited variety that do not allow you to "pass go" and have only experienced the car getting stronger. Lion share of the difference is in the 60-130 range. Also a huge difference going to the Michelin SS tires. Most noticeable 0-30.

 

The issue will be engine longevity. There's no doubt that they will pull stronger for awhile, but only time will tell how long these tuned and boost-increased engines last.

 

Remember the Project 7 puts out about the same power as that fully boosted R and the V8 S clearly has a lot of headroom. We've been putting these things on older XKRs for years along with twin screw supercharger upgrades and, so far, the engines have held together up to the point when some idiot decided to combine water injection with a chiller killer and gets ice in the engine.

 

And exactly how did that work out?

 

Thanks for all the input. I would really like to do this but want to see some longevity reports on a pulley/tune mod. Like I read in another post. Looks like the V6S is already pushing it's limits..

 

Once my 3-year warranty wears out I'm going full power to 620hp. Then its track time!

 

My point was with regard to longevity. I'd be very impressed if there were numerous examples of 75K miles (or more) "older XKRs" with that kind of boost.

On the other hand, most here will not drive these cars past the warranty mileage limit.

 

Didn't we already go through this in the other thread https://www.jaguarforums.com/forum/f...pulley-139579/ ?

 

Cambo,

Yes, we did, but that happens here a lot with new people showing up all the time.

 

I don't really mind, the more discussion the better as far as I'm concerned, just wanted to point out what had been said previously in case anyone missed it.

 

One thing to keep in mind when concerned with longevity... How often are you flooring it and hot lapping?
My thoughts are most of us tend to baby these cars and accelerate hard here and there, but not as often as one would think.
In that case, longevity of a tune and pulley when done properly wouldn't be much of a concern.

Regards,
D. Fricke

 

Good point. When "babying it" around town, which is the majority of time, even a highly-boosted engine is receiving less than OEM is capable of producing.

However, the engine is still wearing over time, and while it might be capable of tolerating considerably higher than OEM levels of boost earlier in it's life, it would be more at risk later in life.

 

I think the engines will hold up fine with more hp. If you are in the boost often, it may be a good idea to increase maintenance. At some point around 600 hp full instrumentation will be a necessity, monitoring EGT, oil temps, A/F ratios etc. otherwise you're just rolling the dice.

Not sure the rest of the drivetrain will survive but again, extra maintenance would help.

 

Cambo
Yes it was discussed in that thread and I found it during a Search. That is why I put the "Edit" at the bottom of my original post. I still greatly appreciate the wealth of knowledge and input this thread is receiving. This apparently is quite a popular topic and point of interest for a lot of us... Thanks for forgiving my rookie mistake I made before posting....