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Thread: More 240z Suspension Questions

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  1. #1
    Join Date
    Mar 2001
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    Acworth, GA USA
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    455

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    Quote Originally Posted by Tom Donnelly View Post
    Keith,

    Glad you're still around! My plan was lower spring rates and increase them as my track time, consistency and precision goes up. The lower spring rates are more forgiving right? And not necessarilly slower. I need to run newer than 8 year old tires too.

    Tom
    That, gentlemen, is a man who don't let ego get in the way of good decision making.

    Higher rates are ultimately faster on paper because the aid to roll control gives a better contact patch provided the shocks are up to the task, however, you've heard me say that a softer car is faster sooner- meaning if you aren't driving a lot (twice a month+ may be enough for an ITS driver to be on his game) you may be faster in a softer car, and faster earlier in each track weekend because you acclimate sooner. Now if the car is wallowing all over the place because the shocks don't work then softer won't help, but you know what I mean.

    Chet and I ran front row ITS times at Roebling one weekend in a $300 240Z with a 150k bone stock motor and some old race pads and tires with the old Bob Sharp street Koni package on it- about 115 lb/in springs up front and about 140 in the rear. Some of the most fun I ever had on a track ('course a lot of that was because we were kicking major Porsche butts with a $300 car, but I digress) because it was balanced and the shocks matched the springs well. Blast to drive, went where you pointed it, and recovered predictably when you got out of whack. Wasn't as fast as our ITS car mind you (which I hear ran 117's at Roebling a couple years ago, Holy $h1t!), but I'd venture to guess that most of an ITS field would be faster in that $300 car for a Saturday qualifying than their own race car.
    katman

  2. #2
    Join Date
    Jul 2004
    Location
    Raleigh NC
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    3,682

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    Quote Originally Posted by kthomas View Post
    Wasn't as fast as our ITS car mind you (which I hear ran 117's at Roebling a couple years ago, Holy !),
    Is that correct? If so I think that would have the ITS record. The fastest Z that I've seen down there in the last few years at the SARRC weekends has been John Williams' car in the low 1:20.xx. As far as I know Jeff or I haven't missed a SARRC weekend down there.

  3. #3
    Join Date
    Mar 2001
    Location
    Acworth, GA USA
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    That was according to the current owner, Bobby Bitterman in AL. The car now races vintage, but is still in IT trim, tires, and the Sunbelt IT motor that was sold with the car. Not sure what if anything might have been out of IT spec other than the RR shocks. I could be wrong, but I'm pretty sure he told me he turned laps in the 1:17's. It was captured by the data acquisition system on board so perhaps there's proof.

    No doubt in my mind that car would be faster than John Williams. 1:17's? I dunno.
    katman

  4. #4
    Join Date
    Feb 2001
    Location
    Atlanta, Ga
    Posts
    631

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    [quote=kthomas;294658]Not sure what if anything might have been out of IT spec other than the RR shocks./quote]

    Keith and Ron,

    I know Keith said same tires but slicks are allowed in vintage. He probably ran slicks. Which would help close the gap between ITS and EP times. That would be close to the same setup in Grayson's old car I think. Then 1:17's would be real doable. Don Ahrens ran a 1:17 last year in EP at Roebling in a 240z.

    Tom
    Last edited by Tom Donnelly; 09-08-2009 at 01:49 PM.

  5. #5
    Join Date
    Feb 2001
    Location
    Atlanta, Ga
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    Hey, how come my quote stuff didn't work?

  6. #6
    Join Date
    Feb 2005
    Posts
    36

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    Actually it was a 118 and small change. The car was on dot's and the only thing not ITS legal is the rr shocks. Great weather and good drafting partners a (gto and a 914-6). Three laps were in the 118s. There is alot of set up difference between Johns car and mine. Most of the lap time came from turn one and two. Enough corner speed that I stayed in 4th gear from the front straight untill turn 4. I have learned that Z cars are very alignment sensitive.
    Bobby Bitterman

  7. #7
    Join Date
    Jul 2002
    Location
    Jacksonville, Fl. US
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    101

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    Ok Bobby, you know someone was going to ask! What did you do alignment wise to get through 1 and 2 so well??? Z car guys want to know!
    Charles Perry
    ITS #21 280zx

  8. #8
    Join Date
    Aug 2001
    Location
    rutherfordton,NC,28139
    Posts
    254

    Wink Years ago......

    Quote Originally Posted by Ron Earp View Post
    Is that correct? If so I think that would have the ITS record. The fastest Z that I've seen down there in the last few years at the SARRC weekends has been John Williams' car in the low 1:20.xx. As far as I know Jeff or I haven't missed a SARRC weekend down there.
    Jeff/Ron......This series one 240z "Keith is refering to" ....Blue/Blue car wasn't super fast...in a straight line, but handled quite well..I was privileged to be a passenger in with Chet driving that weekend back in 1999/2000 maybe.... I remember well cause Chet done blowed my engine up that weekend telling me to go faster :eek:.......Damn V-8...
    Many moons ago......

    Ready to try some extreme camber at the SIC........Hmmm...

    David Spillman.......
    30 year old ITS car

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