Hey,

my name is Christian from Germany and I want to trade in my 2004 SVT Lightning into a Jeep SRT8. The L is heavily modded and it now goes 0-60mph in 4,82s. My best top speed, measured with a GPS system, was 162,8mph. And if some of you guys know, the most highways (called Autobahnen)here are without speed limit.
I want to buy a Jeep, because I need more seats.

Is there a speed limiter or not and how to eliminate it???
(I want to kill Porsches or BMWs at top speed)

For my L I have a DiabloSport Predator and some tunes for different situations. So I can upload the tune I need via my laptop.
Is there anything similar to this???

Will the hemi survive long high speed turns??? 30min. with 145mph!!!

What mods do you recommend??? For high speed turns???

All the Lightning community say that Red is the fastest color, is it the same for the Jeep??? :D

Greetings from Germany!!!

I believe the speed is limited at 155mph and there is currently no way to remove it. It seems Bahnburner hasn't ran into any problems running his SRT at high speeds for long periods of time.

1 There is NO speed limmiter on the Jeep.I have had mine indicating 167MPH I think maybe I could have gone 175.

2 I have never gone through a tuen @ 135 MPH bit I don't know why the Jeep could not handle it. At 157MPH the Jeep was suprisingly stable.

3 As far as Mods go I would go to www.gsmotorsports.com Ask for scott.The Mods I have gotten are Ported and polished heads"comes with high performance valves",Ported and polished intake,Cold air intake,ESP/FAN switch with 180 degree thermostat,Magna Flow exhaust,and a Jet performance chip.

My 0 to 60 times are 4.2 seconds and 1/4 mile runs are low 12's

Hallo Christian! Ditto the last comment. There is no speed limiter and given enough space this thing will blast to mid-160's with no problems or hesitation. I have done this on a weekly basis since April and the thing is more fun now than when I got it. If you are interested in buying a pristine Black SRT8 Jeep with the SRT1 package, send me a private message and we'll talk. I may be able to still grab a silver one at EP and ship it over....:cool:

I think if this truck sat a little lower it would be even more fun on the autobahn. I am very mindfull of the front end and have yet to hit anything in almost 6K, so another inch or so would be fairly reasonable to deal with. Even a subtle wing or spoiler(and I do mean SUBTLE! no rice wing) would probably work wonders on keeping the rear end planted - and maybe cut down on the vortex happening at the rear end! The Jeep deflector is a little too small. This thing will be spotless except for the ass end - dust! My thought for the day.

If you plan on driving regularly at speeds in the 150+ MPH range, do not lower your vehicle.

The downforce on the front end of the Jeep, due to large frontal area as well as rake, easily drops the front end by at least 1 inch at those speeds.

If you drop the vehicle an inch to an inch and a half, and combine the downforce at that speed, (even with stiffer springs) will give you a total drop (at speed) of 1.75-2.25" at minimum. Subtracting that number from the already short suspension travel, could prove catastroughic. Hitting the bumpstop (say a bump in the road or a pot hole) at that speed could casue the excess deflection to transfer to the tires, with the low profile stiff sidewall runflat tires inability to absorb such forces, it could cause the tire/wheel to bounce (not like a beach ball, but enough for a tire/wheel to bounce off of the ground a single time), creating LIFT, and that is bad.

If you plan on driving regularly at speeds in the 150+ MPH range, do not lower your vehicle.

The downforce on the front end of the Jeep, due to large frontal area as well as rake, easily drops the front end by at least 1 inch at those speeds.

If you drop the vehicle an inch to an inch and a half, and combine the downforce at that speed, (even with stiffer springs) will give you a total drop (at speed) of 1.75-2.25" at minimum. Subtracting that number from the already short suspension travel, could prove catastroughic. Hitting the bumpstop (say a bump in the road or a pot hole) at that speed could casue the excess deflection to transfer to the tires, with the low profile stiff sidewall runflat tires inability to absorb such forces, it could cause the tire/wheel to bounce (not like a beach ball, but enough for a tire/wheel to bounce off of the ground a single time), creating LIFT, and that is bad.

Touché. I would like a 1/2" - 3/4" lowering kit - just a little drop.

If that's all you want, and you like the rate of the springs offered by the factory, then cut 1/2 of a "dead coil" from each corner. DO NOT use a torch, but a cut-off wheel instead.

Should give about a 1/2-3/4" and your compression rate should stay the same, DO NOT cut live coils, this will change spring/ride height dramatically, and effect the charateristics of handing.

Option 2, take a look at the actual rate of the factory Jeep SRT springs, as well as ride height. Then Look to the after market for a spring kit for a regular Jeep Grand Cherokee, if it offers 2" less than a regular Jeep with a rate higher than the SRT (progressive preferably), then you should also be in the 1/2-3/4" lower than a factory SRT8.

If you cannot find the rate info on the Jeep SRT8, let me know and I will calculate them this weekend.

:D

Thanks for the intel! I appreciate your insight on lowering this rig, mixed with regular high-speed driving. My truck spends @30-40% of its time at speeds of over 100MPH with daily blasts to 140+. To add to what you mentioned in the response above, this is a big truck and it has a more exaggerated body roll than a sports car and this is amplified at high speed. So lowering it may actually increase this effect. I would love an opportunity to put this on an open track or driving course in the wet to instill a little more confidence in the rain. It would be an expensive lesson to learn on the road.....
This is good stuff. Love this truck and this forum. We need some of those hairy arm photos though......

sorry about being long-winded!

One last thing!! I did MULTIPLE WOT from a stop in the rain today! What a blast. I can only imagine what the 426 stroker would be like.......this really is a private carnival ride.

Unforyunatly the Jeep does NOT handle well in the rain

The Tires that are on the jeep are NOT good in the wet,not so much the jeep.Although the firm suspention does not help

I couldn't agree more about the flighty handling in the rain radduc. Being such a big car makes me almost too tentative in the wet. I missed a driving course yesterday (in the rain) because of prior work committments, but I plan on getting the Jeep there soon. Front end feel isn't bad in the dry, but in the wet it seems like the fun nanny kicks in really early. I like the fact that ESP can save your bacon, but I hate it when it kicks in while I still "think" I'm in control of the vehicle. The "wet" course we use at Koblenz offers all kinds of panic stop and turn situations that really allow you to explore the limits without worrying about guard-rails and oncoming traffic. They even have a half-wet circle that they allow me to run with and without traction control on to see how the vehicle reacts. I had a blast on this with the G35 coupe. Second gear made me feel like the drift king with ESP off. I can't wait to see what the SRT8 is like in the same situation. The front end just seems like it washes out way too easily in the wet. Again, a lot of this may be the tires. I was using Pilot Sports on the G35 and they were great in the dry but scary in the wet. I am now on Conti - Sport Contact 2's and they give up a little stiffness in the sidewall for dry feel, but are a great all-round sport tire with much better confidence in the wet (hey, its Germany!).

I would say that 90% of the problem comes from the run flats.The tread pattern,and the fact that they are low profiles,with a sidewall that will NOT flex if an elephant was standing on it ,is not good in the rain.The fact that the suspention is as stiff as it is would be the other 10%.Im sure if you put on a nice soft rain tire the jeep would be 100% better.Fact is,it's a beast.You can bring the lion out of the jungle,but you can bring the jungle out of the lion.I like it that way.