[John Hennessey]

SRT500 Dyno Update: 446 rwhp & 437 rw tq

The latest mods are the Magnaflow and our ram air kit. the magnaflow had to make all of the 8 rw hp we gained. the ram air just wont show any gains while the car is sitting still.

Will post a dyno graph later on today.

 

[jconnolly1119]

I know you've evidently done some headwork on the SRT500, but does this mean that DCX did a pretty good job with the intake and exhaust????

 

[John Hennessey]

Correction - the numbers are:

446 rw hp sae corrected
437.7 rw torque sae corrected

this account for a gain over the stock baseline of:

83 rw hp
75 rw torque

track testing this week if it does not rain.

 

[jconnolly1119]

Correction - the numbers are:

446 rw hp sae corrected
437.7 rw torque sae corrected

this account for a gain over the stock baseline of:

83 rw hp
75 rw torque

track testing this week if it does not rain.

wow........is that with any kind of headers and cats or just the cat-back and new intake (and headwork of course)

 

[John Hennessey]

wow........is that with any kind of headers and cats or just the cat-back and new intake (and headwork of course)

our SRT500 package includes:

Polished Ram Air Induction System
Magnaflow Dual Stainless Steel Exhaust Upgrade
Upgraded Pushrods
Ported / Polished Cylinder Heads with upgraded valves, valve springs, valve guides, retainers and race valve-job
Ported Factory Exhaust Manifolds
All necessary gaskets & fluids
Professional installation
Chassis dyno & Road testing (up to 100 miles)
Limited 2 year / 24,000 mile warranty
SRT500 Exterior Badges
SRT500 Premium Floor Mats
SRT500 Valve Covers
Limited Edition Interior Dash Plaque with Serial Number
Limited Edition Engine Plaque with Serial Number and Power Ratings

http://www.hennesseyperformance.com...oThis=Dodge+Charger+SRT8+HEMI&ActionReq=Where

Our test car has a set of 1.75 in. Dynatech headers on it. They did not to gain any peak power when we installed them. But they may be working a bit better now with the Magnaflow exhaust on the car. Also the test car does not have cats on it. We rate our SRT500 kit to make at least 435 rw hp. Obviously, this particular car with the headers and no cats makes a bit more than that.

 

[JMatt]

Our test car has a set of 1.75 in. Dynatech headers on it. They did not to gain any peak power when we installed them. But they may be working a bit better now with the Magnaflow exhaust on the car. Also the test car does not have cats on it.

Just a reminder: I have seen the engineering comparison between the headers designed for the 5.7L hemi and the exhaust ports on the 6.1L. Those headers shroud about 10% of the exhaust ports. The new version will not shroud any of the exhaust port. That may account for a significant difference, but we'll have to wait a few weeks for definitive results. My car is being used for measurements this week, and I believe the holdup will be tooling.

 

[John Hennessey]

Just a reminder: I have seen the engineering comparison between the headers designed for the 5.7L hemi and the exhaust ports on the 6.1L. Those headers shroud about 10% of the exhaust ports. The new version will not shroud any of the exhaust port. That may account for a significant difference, but we'll have to wait a few weeks for definitive results. My car is being used for measurements this week, and I believe the holdup will be tooling.

i agree. we will be testing a dedicated 6.1 header soon.

 

[John Hennessey]

fyi - we are building 3 SRT550's (2 300's and 1 Mag) and 2 SRT500's (both Magnums) right now. so we will have a lot more dyno and track data coming soon.

 

[AMGhunter]

John Hennessy

Hi John,

First of all, let me say what an honor it is to have you posting with us... I've always been a big fan of your creations.

Regarding your latest SRT8 projects, any chance these will be reviewed in an up coming magazine.

I'm sure all of us would buy a few issues.

 

[marlinspike]

If you have your choice of mag, please make it Road and Track. My college library, in it's infinite wisdom, has trashed all of it's car mags except that one (2 years ago we had EVERY single Motor Trend, Car and Driver, and Road and Track ever published, in a hard copy - not a microfiche. Then one day I went and there were no more mags except for R&T newer than 5 years. I asked them what happened "Those? Oh, we got rid of those last week...they're either at some other library or thrown away")