SRT Q&A Session: 5-16-2007 - Page 7

SRTengineers · 05-16-2007, 05:43 PM

Quote:

Originally Posted by SRTengineers

The IAT location is a compromise between many different factors. Since the calibration is performed after the sensor locations are determined, moving the sensor could have an adverse affect on engine control. I would not recommend moving it.

In fact, as the fuel control cals move , and with lower grade fuels around the country, the Knock system becomes more active , the less spark advance , and performance.

miccar · 05-16-2007, 05:43 PM

Do you know what is causing the white buildup in the coolant? I had my coolant flushed, the recovery tank replaced, the additive added and a new thermostat installed. One week later, the ammonia smell is back, the coolant is frothy / foamy and the coolant temperature is 230-235 degrees in 55-60 degree weather. What is the white sludge in our engines and what will the permanent fix be? We paid allot for our cars and we are very concerned about durability issues. Thank you.

timster · 05-16-2007, 05:44 PM

I have an 07 SRT8 Grand Cherokee. My question has to do with knock sensors and knock retard. Specifically, each morning when I first start up the truck, knock sensor 1 (via DashHawk - plugs into the PCM) indicates knocking at about .3417 volts. In addition, the DashHawk indicates knock retard anywhere from 4 to 105 degrees. This phenomina only seems to happen on first start-up, though, as the PCM does not retard timing on any subsequent start-ups throughout the day. Do you folks think one of my my knock sensors is defective, or is it a more serious issue?

Thanks

Have not worked with Dashhawk, but the electronics only gathers knock info from the sensor during select time windows within the spark firing windows of 40 to 0 degrees BTDC on each cylinder. Engines are also more mechanically noisy when cold. The knock signiture is in a band from 5000 to 6000 Hz. Generally, if the crystal which produces the knock voltage is working, it is working correctly. Generally they do not shift frequencies.

SRTengineers · 05-16-2007, 05:44 PM

Quote:

Originally Posted by whiskey

Would it be possible for future SRT models to be able to choose brake caliper color when ordering a vehicle? My wife wants the red Brembos from the Charger on her Cherokee SRT8 and would have ordered it that way if possible.

The calipers are the same for LX and WK. Your dealer could order a red set for your wife.

Blown7 · 05-16-2007, 05:44 PM

Air/oil separators are not vented to the atmosphere.

Jeff

SRTengineers · 05-16-2007, 05:45 PM

Quote:

Originally Posted by SRTengineers

The features can be separated but there is no plan to do so (maybe Mopar is listening?). The amount of complaints we received from customers hitting the rev limiter in 1st convinced us this is the correct course of action for the vehicle.

We'll be more clear, here. The software does not an auto 1-2 shift in autostick mode and full autostick gear hold in 2-3, 3-4, and 4-5.

slimmbones · 05-16-2007, 05:45 PM

Still safe to assume that they is no way to work with adjustments on the ecm for the srt8?

SRTengineers · 05-16-2007, 05:46 PM

Quote:

Originally Posted by GasGunR

Any thought of offering stronger halfshafts or at least a stronger outer hub for the LX vehicles?

Even cars only slightly modified are breaking these things.

Thanks!

Stay tuned...