09 xf supercharged pulley and tune
#1
09 xf supercharged pulley and tune
I currently have an 05 str. I plan on possibly picking up an 09 xf supercharged even though i really want a 2010(can't justify spending 30k+ on a car at this age) I see eurocharged has been making nice gains with the 5.0 pulley and tune. Has there been gains similar in the 4.2. I really want the car to at least run high 12s
#3
Amgeater, the 09 has the same engine as our STRs but a much better dual intake. I also believe it has vvt, but I am unsure what that does or peak power. 13.6 is very fast, but I think you have some further sorting to do with your current STR before you switch to an XFR to fix whatever might not be working.
#4
Yea I kno its the same engine. But was woundering with the tune how much power have they been making since they seem to have proven tunes. My car has 99k miles and plan on picking something up with lower miles, I really love the look of the xf and if I wanted all out speed I would just pick up an e55 or 335i coupe and mod them. While spending a lot less money.
#5
Not many have posted dynos for the SC 09. I put together a intake kit which I'm extremely happy with. I'll probably swap to the smaller upper pulley early next year and get a dyno at that time. I don't think I'd drop the money on a tune without a lot of data to back it up.
Last edited by Blackcoog; 11-19-2013 at 10:26 AM.
#6
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#8
Not true. Aerodynamics only come into play as you reach triple digits (c of d is ^2) especially if the difference between the two is a measly .02 (XFR is .29 and STR is .31). Aero affects top speed, but definitely not 0-60 and cruising on the highway.
#9
After doing done research, I think the reason why the 4.2 XFR is quicker than the STR simply has to do with it redlining each gear. Not sure if the 09 got the active diff that the 5.0 R gets, but if it's the same, then we have out answer. +20 peak hp negated by an extra 200 lbs plus redlining each gear plus an active diff for better launches, is probably what it comes down to, not to mention most STRs are starting to see higher miles being that the 03's are over 10 years old.
#11
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