PPP 426 hits 600rwhp/640rwtq on the dyno

[Power Ported Performance]

One of our customers had his car dyno tuned last week and the results are in the subject. On motor he made 460rwhp/500rwtq and then with the 150 shot of spray, he hit 600rwhp/640rwtq. Thats the equivalent of 750hp/800tq at the crank. He will be taking his car to the track this weekend with his drag radials and spray. Lets hope he is the first car into the 10's. Did I mention all of this was achieved with stock headers/cats and the car is emmissions legal........

[jaded300c]

Thats impressive. Nice to see a vendor doing these kinds of things.Hopefully we can see a video or two!! Keep up the good work.

[Maistro69]

oh surely there will be several angles of video for this awesome event! I cant wait to see!!!!

[damageinc]

Holy hemi batman.....at what point do you have to put a different tranny on these cars?How much hp can they take...I know torque converter,changing the spindles in the rear...but can a stock tranny run in the 10's?

[Power Ported Performance]

Originally Posted by damageinc

Holy hemi batman.....at what point do you have to put a different tranny on these cars?How much hp can they take...I know torque converter,changing the spindles in the rear...but can a stock tranny run in the 10's?

we have run 11 flat, so I am sure it will last at least the first run, but after that, we dont know the breaking point yet. lol.

[Power Ported Performance]

so far his best motor time is 12.0@120mph spinning due to no track prep. There is only a few guys there, so the track is very cold and slick. The n2o will not turn on. The motor runs were all on the n2o tune that has 3 degrees of timing retarded. I should have another update soon.

[Northern Rider]

Is that with the 5.7 or the 6.1 HEMI?

While the tranny is the same design in the 6.1 (the Mecedes WA580 5 speed), it has some reinforcements in the 6.1. AMG have used this units in some of their monsters, as well.

It will be intersting to find where its outer limit is.

[Power Ported Performance]

Originally Posted by Northern Rider

Is that with the 5.7 or the 6.1 HEMI?

While the tranny is the same design in the 6.1 (the Mecedes WA580 5 speed), it has some reinforcements in the 6.1. AMG have used this units in some of their monsters, as well.

It will be intersting to find where its outer limit is.

That is with the 6.1. I am interested about the differences between the two trannies you speak of. We are running a 5.7 hemi transmission behind our 426 in an srt8, what are the differences? We havent had any issues with it to date.

[Northern Rider]

Originally Posted by Power Ported Performance

That is with the 6.1. I am interested about the differences between the two trannies you speak of. We are running a 5.7 hemi transmission behind our 426 in an srt8, what are the differences? We havent had any issues with it to date.

I'm looking back over some info on this and it appears that the differences are only in the programming; drive shafts and differential, and axles:

When SRT set out to develop a more powerful HEMI for the Chrysler 300C SRT-8, they were mindful of the engine's heritage, which led to adopting traditional HEMI engine cues, such as an orange-painted cylinder block and black valve covers.

The SRT powertrain engineers who developed the Chrysler 300C SRT-8's engine achieved more horsepower by adding more cubic inches, increasing the compression ratio, redesigning the cylinder head intake and exhaust systems for increased flow, and increasing engine speed.

To get more displacement, SRT engineers bored out the diameter of the cylinders in the Chrysler 300C SRT-8's HEMI by 3.5 millimeters each, to increase the total displacement to 6.1 liters from 5.7 liters. Compression ratio was also increased to 10.3:1 from 9.6:1, unleashing more energy in the combustion process.

Engine breathing was increased with new high-flow cylinder heads, a specially designed intake manifold, and exhaust "headers" with individual tubes encased in a stainless steel shell, all unique to the 2005 Chrysler 300C SRT-8's 6.1-liter HEMI engine. Larger diameter valves and reshaped cylinder ports in the heads allow for maximized air flow. The intake manifold was designed with larger diameter runners for higher-speed tuning. Exhaust is routed through a larger-diameter (2.75-inch vs. 2.5-inch) exhaust system with 3.5-inch chrome tips.
Performance-oriented camshaft profiles were developed to balance total vehicle requirements, simultaneously allowing more air in and out of cylinders. This increases performance and manages a higher engine speed, which is another method to increase horsepower. SRT engineers increased the HEMI's peak engine speed nearly 15 percent, to 6,200 revolutions power minute (rpm) from 5,400 rpm. Intake and exhaust valve stems are hollow, and the exhaust valve stems are filled with sodium to help dissipate heat more efficiently.

The high-performance 6.1-liter HEMI is further strengthened with a host of redesigned components, including a reinforced engine block with increased coolant flow, forged steel crankshaft, high-strength powdered-metal connecting rods, floating-pin pistons (cooled by oil squirters), and an oil pan modified for reduced oil foaming.

The 6.1-liter HEMI's power is channeled through an A580 five-speed automatic transmission with specially calibrated AutoStick® driver-selectable range control, which offers fully automatic or manual shifting selection. A heavy-duty four-flange prop shaft sends the torque from the transmission to an upgraded differential and axles.

[looselips]

Originally Posted by Power Ported Performance

One of our customers had his car dyno tuned last week and the results are in the subject. On motor he made 460rwhp/500rwtq and then with the 150 shot of spray, he hit 600rwhp/640rwtq. Did I mention all of this was achieved with stock headers/cats and the car is emmissions legal........

Johns car was CMR dyno tuned at GSM in order to see these kind of gains.

Also the statement that the car is emissions legal is a stretch.. ...California has a strict dyno roller test and just because he left the stock exhaust the cam and tuning will in no way support the California or Federal emissions levels.