TERRIBLE!! Paxton Supercharged srt-10 performance
I Just registered myself, I am Disraeli W. Head Tuner of Kartec Tuning here in Caracas, Venezuela, and I now have a good knowledge regarding the performance of the srt10 after one of my friends "wasted" almost 9000 USD in a Paxton supercharger kit for a 8 HP increase, I will explain you why!!
Here are the facts
STR10 2005, v10 500 HP, 500, Ft-lbs, 500 Watts, Black
Imported from the states one month ago
Dynoed 480 HP BONE STOCK on high altitute (890 mm of atmos absolute pressure)
Paxton supercharger kit (NOVI 2000) installed:
Charge air cooler (75%-25% water-coolant mix)
Heat exchanger core front mounted.
Twin Sequential fuel pumps, 105 psi of max fuel pressure at constant 7 psi of boost
Split Second Piggy back computer (timing controller box), according to paxton it will delay ignition timing based on manifold boost pressure, good manifold boost pressure source for it.
Stable boost pressure
Everything else in quiet order.
Water temp 190F deg
Air intake temp 40-55 deg (celcious) Location of the sensor upstream the supercharger 2 inches before the trhottle where the kits says it should go
Dynoed 610 HP (28-30% HP increase, very dissapointed at the beggining but okey so far...)
Water and Air intake temp are "Cold"
Water temp 200F deg
Air intake temp 55-75 deg same location
95 octane, and same weather conditions
Dynoed 550HP (lost 10%)
Seems to be due to higher inlet air temps than 1st pull (fans on teh dyno room working perfect, High velocity and flow)
Water Temp 210F deg
Air intake temps 65-85D same location
95 octane, same everything
Dynoed 488 HP (lost 20% from initial run)
Running 5 heat range plug, no detonation from digital knock sensor displays on each motor bank, suggested heat range 6
11.0 to 1 or richer at higher rpms Air fuel ratio on all pulls at that Massive and extreme, overengineering 105 psi on the fuel system.
THE CHARGE AIR COOLER CORE IS QUITE SMALL FOR THE APPLICATION (WILL SUFFER FROM RAPIDLY HEAT SOAK EVEN ON HIGHWAYS OR EXTREME FANS ON IT ON THE DYNO) you will lost around 10-12% from cold initial runs-
YOU WILL HAVE DECENT PERFORMANCE JUST WHEN YOUR TRUCK IS BELLOW 200F OF WATER TEMP. (I think no one wants a 9000 kit to last just a few seconds before it turns to a big hair dryer and instable on power delivery)
IF YOU WANT TO USE THIS KIT, YOU WILL NEED LOTS OF SUPPORTING MODS.
(Colder Roe Termostast, radiator shrouds, bigger heat exchanger core, higher flowing water pump of the cooler system, and maybe, if you can keep the water temp bellow 200 it will feel and be fast!!
I am sorry to tell but we are very dissapointed. It is a very straight forward kit, simple instalation, mechanical fueling approach and simple ignition retard setup.
All dodges PCM seems to be pulling timing when truck is warm, power inestability is increased in the presence of the supercharger.
If someone has suffer from the same story please share it.
Coments are welcome.
Thanks for your attention