Jag XJR vs. GXP - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-14-2004, 01:40 AM   #1
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Default Jag XJR vs. GXP

Listen up everyone. I see a real problem here. I emailed Pontiac almost a year ago and recommended putting a supercharger combined with the Northstar in the Bonnie. I told them that every Pontiac owner would trade in whatever they had to own it. But with the current gas mileage rating, that idea would be scary for the price at the pump. A supercharged Jag with 390hp weighing over 3900lbs averages 18/28 vs GXP'* 17/24. I know! There is a huge difference in price (35Gs) but COME ON GUYS! Achieving a more competitive gas mileage rating shouldn't be asking too much for a $35G+ price tag! 17/24 with a supercharged GXP would be more understandable. I could definitely live with that because of the extra testosterone boost in torque and horsepower. Maybe it is just me, but what do you all think? I want better gas mileage like the SSEI with the V8 and I want a supercharged package to be offered. That would warrant my SSEI going back home to the Pontiac lot. If you don't believe the Jag'* numbers just check it out on www.edmunds.com under large sedans. UNREAL!!!
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Old 05-14-2004, 09:20 PM   #2
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the jags are insane! I agree GM is missing something here...
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Old 05-18-2004, 01:30 PM   #3
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My mom has the piddly 3.5l twin cam shortstar and only gets 18-22 mpg (most county driving 60 mph)
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Old 05-19-2004, 02:03 PM   #4
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A supercharged engine is able to provide acceleration with less agressive gearing and thus run at lower rpms at a given speed. Hence, it has the the potential to be more efficient. You are also more likely to drive at lower rpm and throttle - due to massive available torque. A lot of guys who put a smaller pulley on their L67 car (SSEi/GTP) experience a similar increase in gas mileage - if they can stay out of the boost
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Old 05-19-2004, 10:47 PM   #5
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If you stay out off boost, you'll get better milage, as you can stay off the pedal more with more reserve power.
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Old 05-20-2004, 12:21 AM   #6
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You can run without boost?

interesting concept....Foot introduce the pedal to the floor please...
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Old 05-24-2004, 08:23 AM   #7
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A supercharged Northstar Bonneville that'* FWD may have insane torque steer issues. Plus I doubt a 4L80-E can hold such output levels at OEM standards of duarability. A supercharged Northstar is on the way in a near $70,000 RWD/AWD Cadillac STS. http://www.thecarconnection.com/index.asp?article=7134

If muscle is what you want, then go up the price ladder as such: a mid to upper $3x k 300C, then $50k CTS-v, then STS-v, then E55 AMG.

If you like to stick with FWD traction (avoiding RWD snow woes and AWD friction/service costs), then go: Acura TSX, Acura TL, Bonneville GXP
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Old 05-24-2004, 10:29 AM   #8
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Quote:
Originally Posted by STAGED
If you like to stick with FWD traction (avoiding RWD snow woes and AWD friction/service costs), then go: Acura TSX, Acura TL, Bonneville GXP
Umm...I'm faster then all those for less money? A GTP is even faster and cheaper at same mod levels.
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Old 05-25-2004, 08:04 PM   #9
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Personally, if I had my choice, I would choose the Jaguar. My absolute dream car is the Jaguar XKR100 convertible. My neighbor has one -- among a Hummer H2, 1955 Thunderbird conv., and a 1965 GTO conv.
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Old 05-25-2004, 09:56 PM   #10
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Quote:
Originally Posted by PB3Wannabe
Personally, if I had my choice, I would choose the Jaguar. My absolute dream car is the Jaguar XKR100 convertible. My neighbor has one -- among a Hummer H2, 1955 Thunderbird conv., and a 1965 GTO conv.
A kid (1 yr older than me) I worked with when I was in high school (6-7 yrs ago) now has a H2, 1962 T-bird, Jaguar (Supercharged 4dr), and a mid 1990'* Mercedes Benz SL500 convertable. Two of them were hand-me-downs from his parents (1962 T-Bird, which was his dad'* first car and was given a ground-up resto for the kid'* graduation gift, and the MB SL500). The kids parents have been pharmacist'* in the local area for almost 30 years and now the kid (25 now) has some degree for running a funeral home and works at one somewhere near Minneapolis. Pretty cool guy too. I hang out with him around the holiday'* and have driven everything but the Jaguar -gonna have to talk him into running me at the track -I'll probably get wasted, but not as much as he'd expect.
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