RE: XJR performance modifications
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RE: XJR performance modifications - 7/28/2007 12:48:16 PM
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FL XJR
Posts: 66
Joined: 4/6/2007
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quote:
ORIGINAL: O.G.
Hey Kent, I will let you know in a few weeks how parts go, just purchased an 01 XJR and bought the Borla Exhaust, Cold Air Intake and Blower/Crank Pulley. When talking to the tech, that should give me an extra 40rwhp without the tune which I plain to have done after the dyno run.
Well? How'd it go? I got sidetracked and now I'm looking at performance mods again. A guy at the Jag dealer said he could hook me up with a stainless exhaust, smaller S/C pulley and lower mesh grille for about $2K (which includes installation). I asked if it was a Borla and he said it wasnt - something about "R" performance exhaust from the UK. He didnt identify it further. He said there's a system on a demo car but I didnt see the car. I wanted to know how your car (or anyone else's, for that matter) performed with the mods as compared to without.
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RE: XJR performance modifications - 7/28/2007 1:31:36 PM
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jag_genius
Posts: 1735
Joined: 6/30/2007
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the smaller pulley on the xjr is a definite improvement.. 10 -15 hp right off the bat... i think the kit went for like $350
http://stores.ebay.com/JAG-GENIUS
< Message edited by jag_genius -- 7/28/2007 1:32:08 PM >
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RE: XJR performance modifications - 7/29/2007 6:53:26 PM
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badmojo
Posts: 691
Joined: 12/30/2006
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I'm shure that he's talking about the K&N cold air system not just the filter.
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RE: XJR performance modifications - 7/29/2007 7:02:52 PM
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JimC64
Posts: 6548
Joined: 11/28/2006
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For those thinking of spending some of their hard earned cash on
modifications ''promising'' to increase HP, let me add some info for
your consideration.
I know someone who owns a dyno shop in San Diego. Coincidentally he also owns an XKR. He had the luxury of conducting a series of tests on his car w/o the cost of doing so. Specifically he tested a popular aftermarket (No name to comply with posting rules) air filter that claims to increase HP. First he dynoed his stock factory air cleaner setup; then he dynoed again with the filter element removed (NO air restriction). There wasn't even a full hp (1 hp) difference, which is testament to the factory engineered air induction. Then he dynoed with the aftermarket replacement filter (not the cone) and found the exact same HP rating as with the stock factory filter. His conclusion - the only HP gains you receive might come from the weight loss in your wallet. He also said (being in this business) dyno results can be manipulated to read almost whatever you want it to read, so be cautious looking at paid advertisements showing dnyo results claiming to increase HP.
Now for factory HP ratings - Most manufacturers under rate actual
HP ratings. So,its nothing for a stock 3.0L AJV6 to read higher
than the advertised ratings. Some might remember a few years back when Mazda had to buy back cars they over rated. Several owners claimed they made purchases based on the advertised hp which turned out to be somewhat less (story is easily googled using mazda + hp ratings). In the muscle care days Chevy routinely under rated HP by as much as 100 on the big blocks. So did Ford and Chrysler.
The only way to really know if your mods are making a hp difference is to dyno before and after the mod. But, good news, expect you probably already have more than the factory HP already.
Jim
_____________________________
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RE: XJR performance modifications - 7/31/2007 6:39:28 PM
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FL XJR
Posts: 66
Joined: 4/6/2007
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Thanks for the info, Jim. Did your friend happen to dyno the car with and without the smaller supercharger pulley, as well as with and without a performance cat-back exhaust?? 
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RE: XJR performance modifications - 8/20/2007 10:55:26 AM
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Boosted5cyl
Posts: 30
Joined: 7/2/2007
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im betting not, just spend wisely and there's places out there worth spending $$ at.
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RE: XJR performance modifications - 8/21/2007 7:34:56 PM
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FL XJR
Posts: 66
Joined: 4/6/2007
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quote:
ORIGINAL: bmw745ion19s
hey kent, did you hear about the "R" performance exhaust from Jag/Aston of Tampa? I test drove a current body style with that exhaust and it was a bit too agressive for my tastes....ive heard the supercharger pulley is the way to go. If you still have a warranty the full intake will void it ive heard from the dealer, however the pulley wont..i think ive seen your car around UF lol, saw the silver one a few days ago, you up here for school?
Yes. I was at the dealership a month or so ago, but the car you may be speaking of was sold  . Supposedly, another car was going to be fitted with the exhaust but I havent had a chance to go back and check it out. I have spoken with them about the smaller pulley and exhaust and will likely do it when I can find time in my schedule. As for seeing my car in Gville, it's likely. There's only one anthracite XJR around here that I know of... kinda like when I had my black G 500 up here! I'm working on my PhD (amongst other endeavors).
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RE: XJR performance modifications - 8/28/2007 2:04:41 PM
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O.G.
Posts: 3
Joined: 4/27/2007
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quote:
ORIGINAL: FL XJR
quote:
ORIGINAL: bmw745ion19s
hey kent, did you hear about the "R" performance exhaust from Jag/Aston of Tampa? I test drove a current body style with that exhaust and it was a bit too agressive for my tastes....ive heard the supercharger pulley is the way to go. If you still have a warranty the full intake will void it ive heard from the dealer, however the pulley wont..i think ive seen your car around UF lol, saw the silver one a few days ago, you up here for school?
Yes. I was at the dealership a month or so ago, but the car you may be speaking of was sold . Supposedly, another car was going to be fitted with the exhaust but I havent had a chance to go back and check it out. I have spoken with them about the smaller pulley and exhaust and will likely do it when I can find time in my schedule. As for seeing my car in Gville, it's likely. There's only one anthracite XJR around here that I know of... kinda like when I had my black G 500 up here! I'm working on my PhD (amongst other endeavors).
I installed the smaller blower pulley, 160 degree thermostat, indium plugs, Hi Flow Fuel filter and a drop in K&N Filter for right now. And contrary to what Jim said earlier, I 30rwhp from the dyno pull. I will scan in the results and post them here. I plan on doing the exhaust next. What exhaust were you guys referring to by the way? I'm looking at Borla.
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RE: XJR performance modifications - 3/23/2008 1:59:16 PM
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The_Ikon
Posts: 65
Joined: 11/17/2005
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ANy more up dates?
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