On the one hand I know it is a "guy" thing to want more power for anything no matter what (a la Tim Allen). With cars, if you have 250HP you want 300HP, if you have 300HP you want 400HP, etc. etc. But it seems like it quickly hits the point of diminishing returns for most drivers once you hit the 300HP number, at least for folks that do all/most of their driving on normal commutes. Even then, the skills of most are such that even 300HP is more than most can handle if they are really pushing that 300HP car to the limit. So what is the point to crank up horsepower to 500HP and greater unless you consistently use the car to compete at the track or dragstrip?

I have had cars at all sorts of horsepower levels going from about 110HP in a Toyota Supra up to 400HP with my current XKR. While driving any of these cars under the circumstance under which I drive, with any given car the power was just right.

Doug

 

To keep in in the spirit of enhancing the power of this thread, you already said already something yourself:
“While driving any of these cars under the circumstance under which I drive, with any given car the power was just right.”

Varying power levels is also the good thing about the kit I have as you determine yourself what level you are interested in, and/or also set it right for a specific usage you want it for temporarily.

For me I just love the top setting (so 600hp), and am always happy when I have a chance to drive, its pure enjoyment all the time, even just knowing that you have this much power just on tap. And not to underestimate the extra waftabilty of the in (almost) abundance torque adds so much to driving enjoyment.

It is all about what you personally feel is right for your driving experience, so if you feel that 400 bhp is it for you, than just be happy I would say.

 

There will be reasonable people like Seismic and the ones who have to search the edge, like Andre. And there is a place under the sun for all of us, hoeraa!

I heard you speaking about race fuel ... Water/ethanol injection is better and in the same time cheaper, if you need the boost only at (some) traffic lights.

 

So youre doing 0-100km/h in 3.6-3.7?

 

@Jaguar X300 Driver,
Why not drop by some day (as long as its dry…); I can let you feel what it’s like without additional supplements like racefuel/meth kits

@Fitnessrx
Please have a look at the full post (#73), I mention more than just that.

Most report about 4.2 to 4.4 seconds for a 0-100Kph time, but as explained in the post #73 many parameters play a role, so you will find deviations from this time.

What where the conditions for the 3.6 (or 3.7) times?

 

That was a bit too pricy.

The MAF youre working on which one are you using?

 

What weather conditions etc I have no idea but youre right most says 4.2-4.4 so 3.6-3.7 for the XKR-S must be wrong.

 

Am using the Promracing one.

 

Will you outrun this from 20-200km/h? Just curious.

M60B40 Turbo Megasquirt - YouTube (It dosent start until 1min)


Another question.. You have done more mods than just the TS Supercharger but not the headers. Why not... Is stock headers sufficient even with the TS Supercharger, or is it good to have some back pressure left....Some other reason?

 

Hard to say, his shift speed/power control could use some improvement though.

Optimal headers are difficult on our cars as its very cramped, and some that tried have had issues with the heat. Prices for a system can easily go above $2000 for headers alone, and as the gains aren't known I am personally not interested, but if money isn't an object then why not try.

There is much more to an exhaust system then just back pressure or not, and you need to design it taking the intake/cams into consideration as well, so at most considering the cramped area it will always be a compromise of some sort.

So you need to decide for yourself what you want to achieve and then pick what suits that (or budget) best.

 

Hey, fellas I am new to the forum and I'm eager to hear about the kenne bell swap since I own a 03' str and am looking for upgrades.. I was gonna for a pulley swap coupled with porting but I would rather swap my s/c. Updates would be appreciated, thanks.

 

Am working on it for the STR, earliest update I can give will be arround summer though.

 

Thanks bud.

 

I just came across your thread today and am amzaed at the power you are able to produce by simply changing the stock super charger with a better designed super charger. After reading through the thread I don't recall seeing any information about whether you intended to create an SC upgrade kit for the 2008 XK-R. If yes, when is the expected release date and what is the expected price?

Thank you, your work is very impressive.

 

"Autogasexperts" in the UK...

"Hi, no it is not possible to get more power out of LPG. LPG is to save
money at normal driving manner and not for racing. We would not
recommend installing LPG if you are planing to race the car. It will
not work."

 

Quote:

Originally Posted by fitnessrx

"Autogasexperts" in the UK...

"Hi, no it is not possible to get more power out of LPG. LPG is to save
money at normal driving manner and not for racing. We would not
recommend installing LPG if you are planing to race the car. It will
not work."

I fully agree with them, not just because with racing you would use higher octane fuel, the added weight will also be a disadvantage, so no point in going LPG there.

However with street driving where you would have to compare normal octane fuel with the higher octane values of LPG, the latter will have the advantage in that you can run with a higher boost setting, and there you will be able to gain more power. But I am not advocating LPG in any way; you add complexity and possibly also need the headwork, and all other disadvantages that comes along with LPG.

 

All I need is a car to make some detailed measurements. The setup I have in mind is much easier than for the 4.2XJR and STR so would be easy for me to make.

 

Short of me getting my car from America to Belgium, is there a possibility that you could get an '08 - '10 Jaguar XKR to measure? I am very much interested in procuring your twin screw super charger.

 

Not need to ship it just jet, I will be at the big XK vent in the UK the 19th of May, and there will probably be one or 2 around.

 

Ship your car to Boston & I will install the kit for you. I have it on my car & love it.