Anyone interested in 500bhp+?
Discussion
I have already been long working on a twin-screw conversion on my 2000 XKR, and am now just finished with my 2nd and most promising version. Most of my posts can be found on roadfly (in xk8 and xj8 forums), but I am more than happy of course to tell more about it.
In terms of hp, I actually prefer to use rwhp, and my last dyno showed 401.3. with 20% drive train loss that would be about 502 BHP, and with 22% drive train loss it is 514 BHP.
This all still with the stock intake, stock exhaust, and no other modification! So it seems very possible to get more out of this setup, and I plan soon to have a exhaust modification, and maybe also an intake.
Here is a link to a picture of the final result:
http://forums.roadfly.com/forums/jaguar/jaguar_xj8...
The results so far with my 2.1l twin-screw are very promising, and I might be able to make a package out of it.
I am aiming for a $4k price for the package (but that is a first rough estimate) which includes everything to to place it on your car, but please bare with me until I have a clear picture of how many would be interested, as that will determine a large part of the price.
I think everything can be done in a day, but then you need to be an experienced person. Nothing really special for this kit, just that exchanging even the same blower is not everybody’s cup of tea. Next to that you also need to make small modifications here and there, nothing an experienced wrench would not be able to do.
Until now I do not have experienced any adverse effects, even though the car has already done 120Kmiles now, and it has already had different substantial power increases for the last 20K or so. But the additional power is substantial, and I am sure that you can break the car on a race track or if not treated right, but that is the same for any modification you make.
I think that if you use the power with respect to the mechanical parts, i.e. right oil/oci/warmup, and do not use it all the time, i.e. full throttle continually like on a track, or on the German autobahn (with a speed delimiter the 300 km/h would be easy for sure) it seems to handle it pretty well so far.
I am surprised about the strength of the MB auto box, as I would actually think that that one would give. The box gets tough beatings, as the engine has so much low end torque that you should be careful with. But I cannot resist using it, and so far I have had no issues at all.
But there is one drawback so far, and that is the tremendous amount of low end torque, has rendered my 1st gear useless ;-). Even taking of in second gear is causing the traction control overtime. You need to control the power if you want a clean start, and that is not easy to learn ;-).
This is of course with the smallest supercharger pulley, and I have a pulley which is just on the border of the possible traction. And that is another good thing about this conversion; you can select the power you like. It is just a matter of changing the pulley of the blower, which is for me a 5 minute job including the belt. I have a pulley for every range I want, from stock to over 500 bhp.
I need to put a bigger pulley on to get to the more stock level of power as the winter is coming here. The throttle response and the immediate power you get with the smaller pulleys will probably be too difficult with max summer tires on icy roads ;-).
Please have patient with me for a little while, as I still want to have the configuration on my car for some miles to test longevity including additional changes like a different exhaust/intake.
The modifications work on a 4.0 SC engine, and will fit a 4.2 engine, though I only have a 4.0 engine and am not able to test a 4.2. I am sure it will work just as good (or even better) on a 4.2 engine.
If anyone is interested, then please let me know via mail. If there is enough interest, I will check in the next week’s what a package could cost, with possible delivery times.
Andre
In terms of hp, I actually prefer to use rwhp, and my last dyno showed 401.3. with 20% drive train loss that would be about 502 BHP, and with 22% drive train loss it is 514 BHP.
This all still with the stock intake, stock exhaust, and no other modification! So it seems very possible to get more out of this setup, and I plan soon to have a exhaust modification, and maybe also an intake.
Here is a link to a picture of the final result:
http://forums.roadfly.com/forums/jaguar/jaguar_xj8...
The results so far with my 2.1l twin-screw are very promising, and I might be able to make a package out of it.
I am aiming for a $4k price for the package (but that is a first rough estimate) which includes everything to to place it on your car, but please bare with me until I have a clear picture of how many would be interested, as that will determine a large part of the price.
I think everything can be done in a day, but then you need to be an experienced person. Nothing really special for this kit, just that exchanging even the same blower is not everybody’s cup of tea. Next to that you also need to make small modifications here and there, nothing an experienced wrench would not be able to do.
Until now I do not have experienced any adverse effects, even though the car has already done 120Kmiles now, and it has already had different substantial power increases for the last 20K or so. But the additional power is substantial, and I am sure that you can break the car on a race track or if not treated right, but that is the same for any modification you make.
I think that if you use the power with respect to the mechanical parts, i.e. right oil/oci/warmup, and do not use it all the time, i.e. full throttle continually like on a track, or on the German autobahn (with a speed delimiter the 300 km/h would be easy for sure) it seems to handle it pretty well so far.
I am surprised about the strength of the MB auto box, as I would actually think that that one would give. The box gets tough beatings, as the engine has so much low end torque that you should be careful with. But I cannot resist using it, and so far I have had no issues at all.
But there is one drawback so far, and that is the tremendous amount of low end torque, has rendered my 1st gear useless ;-). Even taking of in second gear is causing the traction control overtime. You need to control the power if you want a clean start, and that is not easy to learn ;-).
This is of course with the smallest supercharger pulley, and I have a pulley which is just on the border of the possible traction. And that is another good thing about this conversion; you can select the power you like. It is just a matter of changing the pulley of the blower, which is for me a 5 minute job including the belt. I have a pulley for every range I want, from stock to over 500 bhp.
I need to put a bigger pulley on to get to the more stock level of power as the winter is coming here. The throttle response and the immediate power you get with the smaller pulleys will probably be too difficult with max summer tires on icy roads ;-).
Please have patient with me for a little while, as I still want to have the configuration on my car for some miles to test longevity including additional changes like a different exhaust/intake.
The modifications work on a 4.0 SC engine, and will fit a 4.2 engine, though I only have a 4.0 engine and am not able to test a 4.2. I am sure it will work just as good (or even better) on a 4.2 engine.
If anyone is interested, then please let me know via mail. If there is enough interest, I will check in the next week’s what a package could cost, with possible delivery times.
Andre
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