For you knowledgeable people, I'm curious what the top speed of my Bone-stock 04 Limited Ed. Coupe is with the governor/limiter removed and what it would be after a chip tuning. Thanks.

 

Best estimate is 186 MPH. Based on gearing and top RPMs of 6300. Assuming I did the math right.

I'm set to do it with my tunes and mods.

Haven't found the place to attempt it yet.

Or the Naughty Bits to try.

roadster with a stick

 

186 for the 3.07 rear end of the srt6, but limited have a 3.27 rear end, which should bring down the top speed just a bit @ 6200 rpms...although Franc may be correct factoring in the standard shift gearing...I am talking just autos here...

 

I was talking manuals which have a different rear end, I think.

However, I did some swagging with the tach values vrs vrs Speedo numbers and arrived at 186 as well.

I guess I'm going to just have to grab my Kahonies and prove it somewhere.

franc

 

I've done 160 in 9/10th of a mile from a standing start...never had an area to try that again safely....need a good 3 mile safe area to really know...

 

Teck since you're talking about only the NA 2004 cars, I can't tell you what a perfectly "stock" one would be capable of without the governor. They all have 3.27 gears (auto and manual) and I think in 6th gear the trannys have the same ratio as well.
Being only 215hp though, I don't think they have enough actual power to attain "red line" in 6th. gear, not even sure about 5th. either.
Wind resistance can be a very large stumbling block for a NA car to overcome.
As already mentioned, it's a completely different story for the supercharged cars.
The biggest problem is once the governor is removed, it really isn't "stock" anymore, because I don't think anybody offerers a "Tune" for the cars computer that removes "only" the governor.

 

[quote=+fireamx]Teck since you're talking about only the NA 2004 cars, I can't tell you what a perfectly "stock" one would be capable of without the governor. They all have 3.27 gears (auto and manual) and I think in 6th gear the trannys have the same ratio as well.
Being only 215hp though, I don't think they have enough actual power to attain "red line" in 6th. gear, not even sure about 5th. either.
Wind resistance can be a very large stumbling block for a NA car to overcome.
quote]
+1,
The max. hp comes on line around 5,800 rpm and with wind resistance at those speeds building rapidly, the max speed will be way less than the maximums calculated using the higher rpm's.
HP makes for speed at the higher end, because thats what it takes to overcome the continual increases in friction and mounting losses to systems that require more and more power to move at those speeds that drain the hp available.
I would not attempt to find the top speed without some serious preparation beforehand. **** happens and at those speeds it happens faster.

 

[quote=onehundred80]You may be right about the **** part. A safe place, safe car , tires etc. is about all the prep one can do.

As for the RPM/s you are right, the Dyno shows my HP and torque falling off rapidly at 5800 RPMs.

That said I should be able to hit 172 MPH before the math inverses and the laws of physics enforce a negative return on my effort.

Thing is, in third gear, my HP and torque hold strong right up to the limiter (6300 RPM). Puts me at 90 MPH.

I've been at 140 MPH for miles. Car is not at all queasy or loose. With enough safe track, or road, in front of me, a slow measured increase to the max ought to be a reasonable way to attempt it with a relative degree of safety.

I'm 62 year s old. 180MPH is still on my list of things I could probably do. So is cancer and getting shot by a jealous lover.

We all die of something. Some of us get to choose.


roadster with a stick.

BTW, The guys at eurocharged told me that the RPM limiter is set at 5470 RPMs in high gear. So, without the speed limiter your top MPH would be 161 and change BONE Stock.

 

So I am to believe that a governor removal and chip tuning are a combined package. what the top out after..
-governor removal and good chip tuning
-cold air intake (dual tubes)
-whatever other mods you can think of list em.
I'm amazed that there are numbers in the 180's!!! My friends have cars that always kick my *** out of red lights and so on, but when we're on the highway goin 90 or so and we kick it, I always win. I love my Crossfire, but no-offense to everyone, they are shitty drag cars. Thats why we take a shameful near 7 seconds to hit 60, because we are so well top end geared and dont taper off acceleration in high speeds, thank you wonderful Mercedes engineering. dragging just isnt in their make up, but i think dragging is lame, track racing takes skill and much more than power. i tell my friends with their little civics and STI's that on a track, you only go 0-60 one time. If you take on a Crossfire in a track race with less than 100 grand in your car, you will lose. I made a Viper break rear wheel traction takin a good turn at 135 on the freeway.

 

And what road course track are you actually seeing this happen at?

At my local road course track (High Plains Raceway), I get to see plenty of different kinds of cars, STi's and Vipers included, that are able to take the track just as well, if not considerably better than the N/A Crossfire.

Your price point of $100k is ridiculous, also, and you should stop boasting about something that you can't back up.

BC.

 

anyway, not to step on toes here. you need to do this in a controlled environment. I had a couple of deputy friends giving me the go ahead for my mile run....it just turns out what we thought was a true mile wasn't. It was 9/10ths of a mile, but it didn't matter, that was shut down time. some old military base with a 3 mile runway would be nice.......just be safe....140 is a simple jump for me, but mine isn't all stock either...so who knows...be safe....

 

Blade cutter said it first. But to add to his remarks, if you bought an NA Crossfire to drag race, you didn't do your homework.
215 HP to 3300 lbs 3.56 rear end with those big 19 Inch wheels.

14 sec car at best stock. 13's possible with tunes and mods. The Crossfire was built for the Dragon not Draggin'. Somewhere on the 11 mile journey thru the twisties, the NA Crossfire will leave the Viper in the ditch, literaly.

I've got $3500.00 in mods on my NA and it will do High 13's
Cathy's SRT has maybe $10,000 in mods, tops. It does low 12's. A little work, less than a grand, it could do 11's

A far cry from $100K


roadster with a stick

 

the NA is very nimble thru the road course or the twisties of a mountain road...Franc keeps up with all us no problem at all, now out there on the straightaway...that can be different...each to their own, they are great all around cars in my opinion and I didn't have to pay a 100 grand to play either

 

Franc....step away from the keyboard...you're starting to scare me.
Maybe I missed a post somewhere, or I didn't get the memo, but I thought Psuperti's car was the only NA car breaking into the 13's, and that was on the bottle.
Has there been some secret 1/4 mile testing going on out there in the midwest that we're only now beginning to hear about?
By the way, you should copyright "The Crossfire was built for the Dragon not Draggin" statement.
I completely agree with Oledoc's opinion that a reasonably well driven NA car can hang with the "Big Dogs" on a road like the Dragon (and some of its surrounding byways), but throw in too many longer straightaways, and it's
adios amigo..

 

What is this "math" that everyone says they use for this? I wanna learn.

 

I'm braggin' just a little and maybe overstepping. I haven't gone to the track, yet. Was going last Friday but it was cancelled for weather. I know better than to post withiout a real trap ticket to back it up. Just couldn't help myself with the $100K remark.

But the measured quarter mile of unused road by my place has teased me enough that I did some unofficial sprints. I think I'm close to gettin under 14, (just), without a bottle.
I was 193 HP at the wheel last summer on the dyno. 90F degrees. That's 25% more HP than a stock NA.
We now have 60F degree cool dense air.
Stock SRT is what, 230 HP at the wheel? I'm close.
Stock NA is 14.7 sec, so I'm close theoreticaly. I think.

Meanwhile, I agree that in the twisties talent and agility matter. I do keep up with Oledoc on the Dragon but not the Hellbender section.
And keep in mind, I run with an SRT companion often. Like every day. Cathy just grins and shuts me down on anything straighter than the Dragon.

We do the a 1/4 mile drag to get on the the highway every day. She is 2to3 car lengths ahead every time. I'm working the shifter like a rented mule and she hasn't even pushed the the OMG button.
But then, she is a 12 second car.

So yeah, I know the difference.

roadster with a stick

BTW didn't you have a thread that theoreticaly showed it was possible?

 

If you know all the ratios from engine crank to the wheel,. And you know the circumference of the wheel, you can calculate the speed over the ground at any RPM of the engine. You can calculate it in any gear.
That's the hard way but most accurate.

You can swag it. If you assume your gauges are correct, you can determine the speed in a gear at 3000 RPM and just double the number for a somewhat accurate guess at what the speed would be at 6000 RPM.

In sixth Gear you can determine the RPMs at 3150.0 equal 90 MPH. Therefor 6300 RPM would be 180 MPH. Kinda hard to set the RPM's at 3150 but a little practice and swag and off you go.

It's simple really!

roadster with a stick

 

Forget the dual tube CAI. You need a 3" single source for maximum efficiency.
Draw air from low and to the side but outside of the engine compartment.

Get a dyno tune, larger injectors and do some minor exhaust work. Hotter plugs may help also.

Throttle body would be my next improvement, port and polish the stock one or look at a larger diameter unit. This I would not do without a good tuner.

Any mod may help in an of itself. But, a good dyno tune can wring every bit of power out of the mod. My CAI and a flash tune gave me 29 HP. My dyno tune gave me 57 HP at the crank.


roadster with a stick

 

Can you tell me how you had this measured or did you have the engine out?
$3,500 and < $10,000 I never guessed it was possible.

 

nice, so whats ur top speed and horsepower at now?