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Thread: 4.7 vs 5.2 (stock)

  1. #1
    Registered tonyl27's Avatar
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    Question 4.7 vs 5.2 (stock)

    which is faster w/ no mods?

    this may have been covered before but search is down as usual....

    - tony
    06 srt-8 jeep
    01 wj - sold
    97 zj - sold

  2. #2
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    I posted this on the Grand Cherokee site also:

    I borrowed my brother G-Tech(performance competition) performance compter and did some runs last night on the way home. The first couple tried I was in 2WD and I was getting way too much wheel spin off the line(non-LS)but finnaly made a OK run of 15.8 @ 86mph. If I keep praticing, it would get better but I didn't feel like beating on the truck. I then used 4FT and made three passes at 15.5 @ 88mph with no wheel spin. I did a full throttle brake-torque(in 4FT) for these times. I've used this G-Tech in my Grand National over the summer at the track and was surprised how perfectly acurate it was for for only $300. It is the top of the line G-Tech "competition" model.

    '02 WJ Laredo V8, Select-Trac w/15K miles and completely stock down to the airfilter.
    '02 WJ Laredo V8; Selec-Trac; Silverstone

  3. #3
    Registered GrandMan's Avatar
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    First gear and reverse on the WJ 4.7L is a 3:1 ratio. Great for pickup!
    Just add the HO intake/cams
    ASE chip
    and it will really have more down low!

    -Will
    2k WJ V8 Laredo Black/Camel leather, QT-II
    54k miles as of 9/4/05
    MODS: Black painted cladding, Kolak Exhaust (w/70 series muffler), K&N FIPK w/Brian Stroud's RamIt! intake, aftermarket sunroof, "De-Amberized" Headlamps, Lund slotted taillights(painted), 20% tint on fronts, UC springs(with non-uc shocks), Rear Addco w/poly bushings, Rancho 5000 SS, JL Stealthbox, RF Punch 75x2, Phoenix Gold BassCube, 9005 Sylvannia SilverStars in lows,9005 Hiper Super Plazmas in fogs
    THANKS KOLAK!!!

  4. #4
    5.9 Elitist ptownTSI's Avatar
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    i guess the 5.2, its got more torque and its lighter.
    98 5.9 Limited (my 2nd 5.9 and 3rd ZJ)
    Ice cream paint job
    Rear view mirror, Jumbo dice! Trunk hit hard like Kimbo Slice.

  5. #5
    5.9 Elitist ptownTSI's Avatar
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    i ran 16.07 stock
    98 5.9 Limited (my 2nd 5.9 and 3rd ZJ)
    Ice cream paint job
    Rear view mirror, Jumbo dice! Trunk hit hard like Kimbo Slice.

  6. #6
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    The 4.7 is faster stock mainly because of that new transmission thats put behind them. It's basically a 5spd in disguise and has lower gear ratios. I haven't driven a 4.7 but from what I've heard the 5.2 feels quicker and more "gutsy" off the line but will lose to the 4.7 top end. I think Car and Driver got a 4.7 down the 1/4 somewhere in the upper 15's and a 7.7 0-60. 8.0 and 16.2ish for the 5.2.
    jason
    SOLD: 94 Grand Cherokee Limited 5.2: a few bolt ons

    SOLD: 99 Camaro SS M6: SLP lid, LS6 intake, Shaner S3 ported throttle body, Pacesetter LT's, 3" true duals dumped w/ Dr. Gas X & Flo Pro Twister mufflers

    FOR SALE: 06 Charger R/T black, 52k, bone stock $15,900

    "The problem with common sense is that it's not very common."
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  7. #7
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    This is how it is for stock

    5.9>4.7HO>4.7>5.2>4.0

    The 4.7 beats the 5.2 everyday all day. If you dont believe me ask Dino.
    2002 WJ 4.7 liter V-8, Leather, sunroof, power everything,....etc etc etc...But no mods yet

  8. #8
    Registered TheyCallMeSteel's Avatar
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    The fastest stock 4.7 I've seen is 16.2, I've never seen a 5.2 run so I dont really know. I'd guess the 4.7 should win.
    -------------------
    2010 Acura MDX Advance/Ent
    2012 Acura TL Advance SH-AWD

  9. #9
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    99 stock 4.7 15.98 @ 8x.xxx
    Now: 99 WJ Limited 4.7 Dark Slate so stock
    Then: 96 ZJ Laredo 5.2 Bilsteins and ipd sway

  10. #10
    Stroker Fever Dino Savva's Avatar
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    Originally posted by Diceman
    This is how it is for stock

    5.9>4.7HO>4.7>5.2>4.0

    The 4.7 beats the 5.2 everyday all day. If you dont believe me ask Dino.
    Agree, though the margin between the 4.7 WJ and the 5.2 ZJ is less if the ZJ has the NP249 and can launch in 4WD.

    1992 XJ 4.6L "Poor Man's" Stroker
    202rwhp @ 4700rpm (248bhp)
    258rwtq @ 3400rpm (311lbft)
    1/4 mile: 14.63 @ 94.4, 3450lb curb
    AX15, NP231, D30/D35
    Jeep Performance, Jeep Tech, Junker to Stroker

  11. #11
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    My 4.7 is stock and runs consistant 7.5 0-60 times. It is a little slower than when I first bought it becasue one of the TSB's put in by the dealer last year, retards the timing a few degrees. The early WJ's were tested as low as 7.2 seconds to 60, but after the TSB, I think 7.5's are typical. As far as top end goes the WJ is pretty mediocre. Lots of cars are quicker starting from 60, but very few are quicker starting from 0.

    I agree that the transmission in the WJ makes a big difference. Whenever I have run against a 5.9 I lose, but I am ahead after 1st gear. After that its pretty much over.

    The other issue is untill recently there is more horsepower potential in both the 5.2 and 5.9 if you want to go after it. Lately though, the 4.7 has had cams, heads and pistons become available so this gap has narrowed.

    What I find very strange is that lately I have seen articles on the 4.7HO with 0-60 times over 8 seconds! This amazes me. They must be draging an anchor behind that WJ to turn 8 seconds with a 260 HP V8.
    2000 GC, 4.7, Limited, All options

  12. #12
    Registered TheyCallMeSteel's Avatar
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    well I wouldnt say a hook, but thats definitely slow. I personally dont believe that the stock 4.7's will run 7.5 0-60's no matter what you do. (less than weight reduction) I have seen too many cry to break 16's in the 1/4, that would definitely not justify 7.5.
    -------------------
    2010 Acura MDX Advance/Ent
    2012 Acura TL Advance SH-AWD

  13. #13

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    I think a 7.5 0-60 for the 4.7 is realistic. I used to have one and street raced a lot and would run pretty dead even with a lot of cars rated in the low 7s or high 6s 0-60. It is a very strong low end, but is a bit sluggish after 65 which would account for its slower 1/4 mile times.

    0-30 you better be in something real fast to beat it. (like my 5.9 that does 0-60 in 5.9 seconds)
    Read my 5.9 and watch the video @ www.caroftheday.org

    2003 Overland
    Brilliant Black
    1/8 9.44 @ 72.5, 1/4 14.93 @ 88.96, 0-60 6.46 seconds
    (times were with removed spare and rear seats)

    Previous Jeeps
    Deep Slate 5.9 LTD
    K&N FIPK, MOPAR ECU, Relocated IAT, Gibson Catback exhaust, Fastman 52mm TB, Removed Skids, MPI, catsound cat, 180 tstat, Positive Performance Headers, Off-road pipe, 1/8 9.10 @ 74.4, 1/4 14.42 @ 95.3, 0-60 5.83 seconds, Top speed 136mph

    2000 Laredo V8 4x4
    Read my Car of the Day Blog @ www.caroftheday.org

  14. #14
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    I can only speak for my own vehicle which does mid 7 0-60's pretty consistantly. Of all the magazine review's on the 4.7 I have seen several that list high 15's in the 1/4. I have never seen one over 16. However, driver technique makes a big differnce when trying to compare vehicles performance at the track.

    The 4.7 puts a lot of torque to the ground in first gear. If you do the math on the torque multiplication...295 lbft x 3 x 3.73 = 3300 lbft.
    Compared to a 5.9 ... 345 x 2.45 x 3.73 = 3153 lbft.
    A 5.2 ... 300 x 2.45 x 3.73 = 2742 lbft

    For second gear...

    4.7 = 295 x 1.67 x 3.73 = 1838 lbft
    5.9 = 345 x 1.5 x 3.73 = 1930 lbft
    5.2 = 300 x 1.5 x 3.73 = 1678 lbft

    So teh adantage swings to the 5.9 by second gear and the advantage gets really big after that. This explains why a 5.2 feels like you have forgotten to release the parking brake compared to a 4.7. This was why I traded in my 5.2 for the 4.7. The low gear quickness is very different.

    On teh other hand I found it MUCH easier to get extra power out of the 5.2 with inexpensive changes. The 4.7 seems to be lots tougher to tweak cheaply. If you want to build up a machine to be a drag racer, I wouldn't choose the 4.7.
    2000 GC, 4.7, Limited, All options

  15. #15
    5.9 Elitist ptownTSI's Avatar
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    the WJ has a 3x torque converter? im trying to get the 2.6x from aps do you think that is enough?
    98 5.9 Limited (my 2nd 5.9 and 3rd ZJ)
    Ice cream paint job
    Rear view mirror, Jumbo dice! Trunk hit hard like Kimbo Slice.

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