Heffner’s SRT Head and Cam Dyno Results

[Vipera Russelli]

My naturally aspirated heavy breathing dragon now puts out 564.1 rwhp and 564.1 rwtq, sounds simply awesome, and even picked up power at the low end too!

What's this all mean in practical terms, besides a huge smile on my face? Hang on for your life, that’s what! Last night I was just cruising along at about 50 mph in third gear at about 3000 to 3500 rpm when I gunned it, shifted almost immediately into fourth (having reached 5500 rpm in a second or so) and took fourth up to about 4500 to 5000 rpm in just another second or so, glanced down at the speedo and gasp at the 115, no 120, no . . ., yikes!, slow down, mph. It’s not that the speed is too frightening in and of itself, it was the ease and immediacy of obtaining it that impressed me. “WOW!” was all I could say. What a beast! What a blast! This much naturally aspirated power with a .354 gear change is exhilarating to say the least. What a country!

As for the sound, it’s unbelievable! She sounds ferocious, even at idle... especially at idle. She’s really deep, guttural and choppy, shaking the car and declaring to the world at large her true potential for mayhem ready to be unleashed with a mere tap on the throttle. Everyone notices and positively comments on the sound, which draws people to the car like moths to a light--it’s like a flippin’ car show everywhere I go now, hehe. And at WOT, well…, hehe, the dragon simply ROARS!!!

Thank you Jason Heffner! Job well done! Now if I can just get my pilot’s license and a G-suit from the Air Force, I’ll be just fine.

 

[ARMORGOD]

Re: Heffner’s SRT Head and Cam Dyno Results

If you wouldn't mind, how much was the head/cam package?

 

[Saleen-Explorer]

Re: Heffner’s SRT Head and Cam Dyno Results

Get a vid on here ASAP!!!! I want to hear that beast rumble, and congrats on the power

 

[VIPER D]

Re: Heffner’s SRT Head and Cam Dyno Results

What about more fuel and timing to match the flow on the heads? Do you have a vec2?


stock headers??? What kind of dyno was used, Some of the newer dyno's can give 1/4 mile times.


vd..


good luck and enjoy your beast

 

[Viper X]

Re: Heffner’s SRT Head and Cam Dyno Results

More details would be great.

 

[SnakeBitten]

My naturally aspirated heavy breathing dragon now puts out 564.1 rwhp and 564.1 rwtq, sounds simply awesome, and even picked up power at the low end too!

What's this all mean in practical terms, besides a huge smile on my face? Hang on for your life, that’s what! Last night I was just cruising along at about 50 mph in third gear at about 3000 to 3500 rpm when I gunned it, shifted almost immediately into fourth (having reached 5500 rpm in a second or so) and took forth up to about 4500 to 5000 rpm in just another second or so, glanced down at the speedo and gasp at the 115, no 120, no . . ., yikes!, slow down, mph. It’s not that the speed is too frightening in and of itself, it was the ease and immediacy of obtaining it that impressed me. “WOW!” was all I could say. What a beast! What a blast! This much naturally aspirated power with a .354 gear change is exhilarating to say the least. What a country!

As for the sound, it’s unbelievable! She sounds ferocious, even at idle... especially at idle. She’s really deep, guttural and choppy, shaking the car and declaring to the world at large her true potential for mayhem ready to be unleashed with a mere tap on the throttle. Everyone notices and positively comments on the sound, which draws people to the car like moths to a light--it’s like a flippin’ car show everywhere I go now, hehe. And at WOT, well…, hehe, the dragon simply ROARS!!!

Thank you Jason Heffner! Job well done! Now if I can just get my pilot’s license and a G-suit from the Air Force, I’ll be just fine.

When you here a guy reduced to poetry and metaphors you know your tuner delivered the goods in spades

Congrats to you and Heffner....I second the vid request..cant wait to hear it..

 

[quickysrt]

how much?

 

[Vipera Russelli]

I'll work on getting a video put together. Yes, the car was rechipped for fuel management and timing. By whom I'm not sure (someone in California, but not West Coast Viper). The headers are Heffner's, cats are R/T steel, and the cat backs are Corsa. Rockers are T&D. The price was very reasonable, a bargain even. Give Jason a call for a quote.

 

[Kai SRT10]

My naturally aspirated heavy breathing dragon now puts out 564.1 rwhp and 564.1 rwtq, sounds simply awesome, and even picked up power at the low end too!

Are the horsepower and torque really identical down to the tenth, or was this a misprint?

Can you give us a list of things that were done to the car? New parts, changes?

Kai

 

[Casey]

Have fun!!

 

[Ooomph]

green with envy congrats on the new found power!

 

[ViperJohn]

Re: Heffner’s SRT Head and Cam Dyno Results

I am pretty sure I have heard this car in person (Heffner Open House) and if this is the same black SRT, it sounds awesome! The cam in that car is outrageous, never knew the V-10 could sound so good.

 

[Vipera Russelli]

Re: Heffner’s SRT Head and Cam Dyno Results

Are the horsepower and torque really identical down to the tenth, or was this a misprint?

Yes. Can anyone post the dyno sheet for me in this tread if I email it to them?

I am pretty sure I have heard this car in person (Heffner Open House) and if this is the same black SRT, it sounds awesome! The cam in that car is outrageous, never knew the V-10 could sound so good.

That's the one!

 

[Kai SRT10]

Re: Heffner’s SRT Head and Cam Dyno Results

Could you post the dyno graphs?

I'm particularly interested in the effects of the head and cam package in the lower rpm ranges.

Thanks

Kai

 

[Lee00blacksilverGTS]

Re: Heffner’s SRT Head and Cam Dyno Results

I heard the car too, jeez, everybody within a 1 mile radius heard the car! Is there anyone in the known Viper world that DOES NOT KNOW that if you want the most outrageous Viper regardless of year that da man is Jason!!

 

[SnakeEye]

Re: Heffner’s SRT Head and Cam Dyno Results

Congrats to ya new found power!
Patiently waiting to see that dyno graph...

 

[treynor]

Re: Heffner’s SRT Head and Cam Dyno Results

Email the dyno sheet to me at [email protected] and I'll post it for ya. Very nice results, those! Do you have the 'actual' or the 'SAE' graphs, or both?

 

[treynor]

Re: Heffner’s SRT Head and Cam Dyno Results

Dyno sheet (very nice!!):

You must be registered for see images

 

[Brian E]

Russ, you have PM.

 

[Casey]

Brian, you have a chance to get your car out East this weekend! Better take advantage of it!

 

[Brian E]

Casey, I am waiting to hear back from Jason. I have a couple more questions for him.
I am wondering if his e-mail is down, I also tried calling late yesterday and no answer. Jason if you see this call me!
Waitng for a return call or e-mail from Russ also.
You sound like a kid on the night before Christmas, I hope you get everything you ask for!!!
Hey if the weather holds out, call me and maybe Dean and I will take a road trip to be there when the beast is delivered.