Modern Performance
Today we took our SRT-4 donor car and put it on a dyno see how much power it would put down at the wheels.
Now, keep in mind, that here in Houston, Texas it was about 105 degrees, and about 80% humidity, so it hot, and sticky. Humans dont like high temperatures or humidity, and turbo motors dont like high temperatures or humidity.
Because the SRT-4 had a set of factory wires that had to be at least 5 years old, we decided to try out a new set of wires and toss in some new spark plugs.
Heres the new NGK Iridium plugs versus the older NGK R plugs. We strongly prefer the Iridium plugs over any other sort of plug, and Iridiums run very well in Neon SRT4’s. We gapped the Iridium plugs to 38 thousandths before installing them.
Here are the new Granatelli Spark Plug Wires versus the older factory wires.
Here is a photo with the Granatelli wires installed on our SRT4
After installing the new Granatelli wires and Ngk Iridium plugs, we decided to flash the stock pcm with a Diablosport Predator for kicks on the dyno.
Heres the results: Stock 207 hp, new plugs and wires 216 hp, and after flashing our pcm with the Diablosport Predator the horsepower was 228 at the wheels. With the heat, and mixed 89/93 octane gas we had some detonation above 5000 rpms.
Blue-Stock
Red-New Granatelli wires and NGK Iridium plugs
Green- New Granatelli wires, NGK Iridium plugs, and Diablosport Predator flash
Heres the Torque Dynosheet. Here you can see we picked up quite a bit of torque across the board. Torque falls off pretty fast on the top end, due to detonation causing the factory pcm to pull back timing, as well as the stock intake, downpipe, and 2.25 inch exhaust choking off the top end power.
Pretty impressive dyno results for a bone stock SRT-4 with a Diablosport Predator flash isnt it ? If we had intake, exhaust, wastegate actuator we would have been somewhere in the 250-260 horsepower range if not more!
Blue-Stock
Red-New Granatelli wires and NGK Iridium plugs
Green- New Granatelli wires, NGK Iridium plugs, and Diablosport Predator flash
