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    Vipers and higher RPM

    Well, the only significant, RPM-limiting difference between the gen 4s and gen 3s is the oiling system, right? So Everything else is probably good to 6500 (what the gen 4 Mopar ECU revs to). It seems pretty unlikely to me that oiling is going to drop off between 6000 and 6500 RPM. You could try...
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    2008 ACR at the Drag Strip....

    My best pass in my stock ACR is an 11.45 @ 126.1 with a 2.01 60'. This was on regular asphalt though, not a drag strip. I'm not sure I'd under-inflate the PS Cups. Mine wheel hop really badly when they drop below 30 psi.
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    Air Bag/Safety Belts

    I don't mean to doubt Steve-Indy's knowledge of this area, but I'd bet 6-points without a HANS device are better than 3-points plus airbags in certain circumstances, and worse in others. It doesn't surprise me that in a frontal collision, the factory safety equipment works better. I also don't...
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    tunning 08

    I have PBox logs of my car hitting 90 mph in 2nd, and 163 in 4th. Based on the car's gearing and tire sizes, that indicates a 6250 RPM rev limit to me. Though I have had cars which read incorrectly in the past...
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    Vipers and higher RPM

    LS1 owners are also typically less worried about the longevity of their stock motors. I rev my AFR-headed Katech-bolted stock LS1 to 6500 (6800 limiter), but then it sees road course duty. I've always believed that raising RPM significantly is a terrible performance-to-reliability tradeoff on...
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    tunning 08

    Mark, does the new controller allow the revs to hit 6750, or 6500? My ACR hits 6250 stock. Either way, 250 extra RPM is great, especially for track use! That combined with the extra area under the curve is wonderful. I'd really wanted a few more revs - a standalone is looking less attractive now.
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    Video of 2 2008 ACRs Playing around on a Track

    FWIW, my PerformanceBox was $500. Along with TrackVision ($200) and a camera of any sort, you can generate videos just like these. The primary advantage of a PBox is that it is portable and easily sticks to windshields. It will also more easily measure acceleration (magazine-style testing...
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    ACR vs. Katech Z06 Clubsport

    bluestreak, many mag reviews seem to show disparities like this. Look at C&D's review of the GT-R vs. Z06 vs. 997TT. The GT-R had cornering speeds over 10 mph higher than the other cars in some sections of the track, while being nearly identical in others. Though the huge difference of relative...
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    Vipers and higher RPM

    There is the weight and strength of the piston and rod to consider, as well as the size of the rod bearings. The strength of the rod bolts (a common upgrade for early LS1s wanting to rev higher) can be an issue too. Then there is crankshaft and block stiffness, and probably a ton of other...
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    how many miles are on ur 08,any problems yet?

    I expected to have some little problems with a low-volume, hand-built car ('08 ACR with 3,500 miles): I had something burn off of the driver's side cat as soon as I got it hot (after the 500-mile break in). It smoked quite a bit... I removed the right-rear wheel for the first time today (got...
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    Vipers and higher RPM

    Why not just put a slightly smaller pulley on the blower then?
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    tunning 08

    I'm not disagreeing. I've coded microcontrollers used in automotive apps, so its not a big deal for me. Unfortunately, it sounds like anyone wanting to go FI or heads/cam on a Gen 4 is going to need a stand-alone :( gb66gth, if you can make black marks on a straight from the time you turn out...
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    tunning 08

    Its tempting, but for $2,500 I'll go with a standalone. Provided Chrysler controls its throttle bodies and variable cams in the normal (PWM) fashion, it shouldn't too difficult (though moving to a more aggressive solid cam might be do-able too).
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    ACR vs. Katech Z06 Clubsport

    C&D had the Clubsport being 0.6 slower than the ZR1's 1:24.9 lap, but if the Clubsport is really 2,915 lbs, I really doubt the ZR1 is faster. I'm sure the ZR1's OE tires are great, but they aren't going to be as great as PS Cups with some heat into them on a car 450 lbs lighter. I think its more...
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    ACR vs. Katech Z06 Clubsport

    SS lines aren't going to help fade, but the stock pads on the ACR are really as good as I've used. Practically no OE pads are suitable for track use, but the Viper's seem to work. I know a lot of people like to upgrade to race pads ASAP, but I think with some good ducting (which is cheap and not...
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    acr ride question

    Benny, thanks. I just wish I could have gotten clearer traffic for more laps, to shave some more time off. I don't remember if it was you who was asking me about my DAQ and lap timer, but if you want to see what it recorded and a video, go here. As far as adjustments go, the ACR Owner's Manual...
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    acr ride question

    I think we need to define some terms here. If by "dartiness" you mean tramlining (or the tendency for the front wheels to follow ruts and gradients in the road), then its normal. All cars with wide, sticky front tires (and especially aggressive front camber) will tramline, with varying...
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    ACR tire pressures?

    The Viper Magazine ACR setup article suggests that we should look for hot tire pressures in the 35-36 range on the ACR. I'm wondering a few things: A) Is this the optimal front and rear tire pressure to use when the ACR is set up to SRT's recommendations? B) Is the optimal tire pressure...
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    ACR Warranty

    Well, there are race cars that don't require or even allow many mechanical adjustments, such as SRFs and FEs. I might get some flak for this, but IMO if you only want to drive it at a track and aren't looking to get into any specific racing class, don't get any Viper. There are dedicated race...
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    acr ride question

    BennyBrad, I was the guy at the HoD event with the red/black ACR. I was hitting 153-155 every lap on the back straight, and felt no unusual roughness. The factory settings on the dampers are very soft, meaning the suspension is very under-damped. I suggest setting the dampers a bit stiffer...
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    ACR doing autocross

    Why not just start out with SRT's recommended settings? My car is set to the "rough track" ride height with -2.1/-0.8 camber. It still tends to understeer, but the back end can gently come around with to little or too much throttle. I'm thinking a 18x11 front wheel may fix this understeer, even...
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    ACR vs. Katech Z06 Clubsport

    Well, I think this goes to show the importance of aerodynamics. The 'vette had a better power/weight ratio and probably a better power/drag ratio as well. A 2,915 lb 'vette on wide tires is going to achieve some serious mechanical grip. In addition to being cheaper, the ACR seems to have more...
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    Cold Tires in low temps can be fun

    The comments here are interesting, because my stock '08 ACR is the most stable-feeling car I've ever driven under wheelspin. The only time its ever stepped out on me is on a damp, ~50F surface. Usually it just spins and remains straight, or very slightly drifts one direction or another. I've...
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    Cat & Muffler Delete

    How did this end up working out for you? Did the codes stay gone?
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    Need Advice..'08 ACR vs non-ACR

    Lee, Yes I've played with the damper settings, quite a bit actually. I agree the car is downright comfortable on the street settings (this surprised the hell out of me), but my point was that for optimal performance on the street, I'd prefer both less spring and less damping. Of course, this is...

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