300HPGT

Hey guys im new to the site but i have done some mods to my 05' and I am quite car savy. I have done the C&L intake, Magnaflow cat back, Predator tune. the combination made 297hp and 310 ftlb torque at the wheels out of the box. I run 91 octane too. No detonation unless its 95 degrees out.

The problem i am having is that the car wont rev past 6500 rpms. I have set the rev limiters to 7000 rpms on my predator and Im having this problem. Is there something in the stock computer that diablo hasnt changed???? Its not a throttle limit but feels and sounds like a fuel limiter. Has anyone else experienced this problem???? Thanks in advance.

Robert

im so confused

Vegasjay

Have you changed both rev limiter setting's? There are two, the rev limiter and the defalt rev limiter. You should adjust them both by the same incrament's. Just a thought....BTW welcome to the site!

300HPGT

yeah i changed both and it is really getting irritating. I have the most recent updates too. The thing is its cutting out at the preset limit from C&L on their tune from Diablos wesite.

cfr865

Mine does the same thing I have it set at 7000 but 6500 and that's it, I thought I did soething wrong also but it must be the tuner not allowing it to go past 6500, I have read that some people have gotten to 7000 but I don't remember which tuner they used.

300HPGT

they are using the SCT tune. But thats not as user friendly

300HPGT

she wants to rev but i can never get there because of some sort of limiting

SixtySix

Is yours a C&L branded unit by any chance? There are some differences, I've got an out of the box Predator with Diablo's tunes on it, and I've modified the 91 Octane tune and removed the rev-limiter and the speed control and both work

porsche

why would you go past 6500?

300HPGT

I have the most current versions of everything and I have a Ford Predator unit not C&L or Steeda. So im lost. My power curve is flat to 6500 but I want it to rev past when I shift so that Im not hitting a brick wall every time I go to shift. Like when I am racing hard on the street I dont have a chance to look at the tach and It feels like the car will pull higher revs and I always hit the limiter just before I want to shift.

tmcolegr

To each his own. However, most have found for street use 6500 RPM to be plenty. I don't believe from the dyno results I have seen that there is any HP or TQ gains to be had above 6500 RPM.

The only reason I am aware of to change the RPM rev limit is so you don't have to shift into a higher gear late in the 1/4 mile.

Others with opinions please chime in if I am wrong.

300HPGT

This is what I have come up with so far:


Updated and revised to version 21 and still have the same problem. Please reply so that i can get this resolved. Have you ever come across this problem??? Thanks Robert Fattaruso. 951-543-8571 2005 mustang Gt w/ C and L intake and Magnaflow cat back exhaust.]

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ANSWER:
Dear Robert Fattaruso,

Please call technical support at (561)908-0040. Please make sure that you are in your vehicle and have the Predator ready.

Thank you for your interest in DiabloSport!
Stay tuned,
Dan, a proud member of the DiabloSport Support Team

AJC

what was the solution?

300HPGT

um I havent been able to do it yet because I work from 7am - 6 or 7pm m-f and there tech is open when Im at work.

38special

I went to the drag strip the other day and I was having serious rev limiter problems. :notnice: Its looking like a custom tune is in order.

MrMorden

The gains from the extra 500 rpm are not worth the possibility of your motor swallowing a valve due to valve float...

I might put it at 6700 to allow a safe shift at 6500 without bumping the limiter, but 7000 sounds too high to me.

300HPGT

These new 3 valve motors can handle those RPMs and I havent even heard these motors getting valve float at those kind of RPM's. I have seen dyno sheets on these motors that have been tuned and they are flat from 6000 - 7000 RPM's. So they are very cappable.

169stang

I love my SCT...anywho, I have my Rev limiter's set at 7G. I launch at 6G, powershift at 6400 and have plenty of room for the powershift (never taking the foot off the gas). I don't know how the Diablo is that much more user friendly. I have the tune installed in the car and leave it alone. I will be getting the XCal II this week and a program that'll allow me to tune the car myself, thus, bypassing the tuner/dyno.

300HPGT

well I sent my current tune to someone over at Diablo and they fixed whatever was wrong and sent it back to me in an email. Now the limit was raised to 7000 and I really like that. But hopefully they will figure out why some of the tunes arent taking to these cars.

porsche

crazy

300HPGT

yeah i shift at about 6700 in first and 6500 in second.