I have the srt6 roadster. I need to know if there is a way to bypass the speed regulated for the car at 151 mph.

Thanks.

andrew_onorio_sr@hotmail.com

 

You need to tune the ecu, either yourself or through a professional like one of our forum favorites "SI" Speed Innovation or a well known mercedes tuner like Renntech... after the tune the speed should be limited by the transmission... to about 175-190 i guess...?!?

 

And, by the way... you will not gain that much RPM... the engine is pretty much tached out at the electronic limiter. 158 mph just check and see you are at nearly redline in top gear to hit that speed... you really need to tune the ECU so you get a better power band like SRT6_Crossfire and X'ed. did.

 

I checked to make sure Renntech took out my limiter, I ran it up to a little over 170 and it was still pulling hard. I had my eye's locked on the road, but I kept giving a quick glance at the speedometer & tach. I think I was taching around 5,500, I'd say she would do 190 to 200 since they raised my redline to 6,300 or 6,400.

 

~ an srt is not a 200 mph car. hell a ZO6 can't even make it to that mark at 500+ hp.

 

hp does not = top speed

a zo6 will go 200.

 

i guess winter's over for ya... :-)

nice run there.

 

But it sure does help. Making your car as aerodynamically slippery as possible as well as having enough power to push back against the exponential growth of air resistance is the key to top speed.

 

no one has had a stock Z06 hit 200 mph... close but not 200.

and the srt is no where near a 200 mph car... period.

hp does have a lot to do with the equation... but aerodynamics & drag are also factors indeed.

 

Should be able to figure out the rpm vs top speed via the gear ratio & tire height and know for sure whether you would run out of RPM before 200 mph...however, speaking from experience, getting a vehicle above 175 gets exponentially tougher each mph added...it is like hitting a wall. A car that plateaus at 175 mph and does not have enough hp to overcome wind resistance would need 10 to 15 more HP to go 5 mph faster and so on - I would expect an SRT-6 that was geared to turn 6,400 RPM at 200 mph, AND made over 425 hp to the ground would be capable if prepared correctly - and didn't break traction at the top end...sounds like it would be fun to find out!!

 

But is there an ECM bypass that would allow the wheel sensors to be eliminated versus MPH.

Thanks.

 

I don't know of a single person with an SRT-6 that has 425 hp to the ground...

 

Steve,
I have a question.
You said that you were turning about 5,500 rpm at about 170 mph. Another member posted that they were turning a steady 5,800 rpms at an ecu limited 158 mph. How could you be running 12 mph faster and turning less rpm's? Have you changed to 20"s on the rear?


I checked to make sure Renntech took out my limiter, I ran it up to a little over 170 and it was still pulling hard. I had my eye's locked on the road, but I kept giving a quick glance at the speedometer & tach. I think I was taching around 5,500, I'd say she would do 190 to 200 since they raised my redline to 6,300 or 6,400.

 

Humm, they must have still been in 4th gear, I know my '04 coupe would stay in 4th gear if you had it to the floor running at high speeds till you let up on it a little then it would shift into 5th. The fastest I'd had it was about 148 mph.

 

Close enough, I was starting to have Crossfire withdraws after totaling out my coupe about a month ago. Someone mentioned in this thread an SRT6 would not do 200 mph, There's a long straight away on the road I take to breakfast early on Sunday mornings, next time I drive it to breakfast on a Sunday I'll see how close to 200 mph I can get. I'm still not driving the SRT6 very much, I bought a new 2007 GMC 4X4 the Monday before the Friday that I wrecked the '04 coupe, so it's been my every day driver.

 

Thus no 200 mph Crossfires...yet!

Also keep in mind the speedo is not accurate (its optimistic) and will get further off the faster you go - Mine is off 3 mph at 60, so it would be off 6-7 at 120, and so on...however if you saw 180 on the speedo, that should still be a respectable 170 ish actual! I believe you will run out of rpm long before...probably by 170 ish.

Just be careful and don't get caught!! I guess then you would have proof of your top speed then, but I know here in oregon speeds like that are a FELONY and end up in immediate jail time!!!

 

*cough* TRACK *cough*.

 

Ok. My question still is unanswered so I will re iterate it.
IS THERE AN ECM CALIBRATION THAT WILL ALLOW THE ENGINE TO NOT SHUT DOWN AFTER IT REACHES A ROAD SPEED ABOVE 151 MPH???
See if you can give me an answer specific to the question and I will thank the first person that give the answer.

Thanks,
Andrew

 

You would have to take your car to a tuner or pull the ECU and send it off to get it remapped, you have to have the correct software and equipment
to do it.

 

Drove the SRT6 to work this morning, no traffic on a long straight away so I double checked to make sure my previous statement was true. 4th gear @ 152 MPH I was @ 6,000 RPM and 5th gear @ 172 MPH I was @ 5,600 RPM and still pulling hard. So if it won't do 200, I'm sure it would be close. And I don't have 20's on the rear.