meatheadgn

I am running my NT05R's everyday now and would like to run them lower than the 25 psi that the TPMS requires. I had the tire shop install the TPMS in all four corners.

If I run them at 20 psi and the low pressure warning is on does this affect the car as far as speed limit, timing, fuel etc.?

I ran them the other day and the pressure was at 23 and the light came on so I bumped them up to 25 but if no ill effects are had by running them lower I would rather run them at 20 psi all of the time.

Does the car have any nannys that come into play if the low pressure tire warning is on?

LS9Drew

If you go too low it will limit you to a certain mph but it will display that on the Dic. I noticed that when I had a flat and had under 10psi it said limit to like 55 or something

meatheadgn

Does anyone know if I run them at 20 psi and get a low pressure warning if it will limit my speed?
That would be a bad thing during a trip to "Mexico".

meatheadgn

bump

svtgeoff

i need the answer to this question as well for mexico purposes.

06LMBZ

I run mine at 22 and have not at any negative affects.

Unreal

I believe it may disable the "competitive driving" mode but other than that, it is just an annoying light. It does not mess with the fuel/timing or ECU.

meatheadgn

Thanks UNREAL. I will lower the pressure to get the warning lights on and then try it and see what happens. The lights do not bother me as long as I know that the systems are still working well.

FamousRR

Ran mine at 18psi with no prOblems. Even at a half mile roll racing event where hit speeds of 180+.

TORQJNKY

Why do you think you have to run them with such low pressure? I run my NT05R's at 28psi and can hammer it in second at 40-50mph and they hold 655RWHP just fine.

Edit: on a warm day of course.

FamousRR

Well for me it wasn't warm yet and with 777rwhp it would spin. 18-20 is where my setup was happy. Not telling the op to run 18 just saying I did and there was no problem.


This was with nitrous so the hit would make it spin. Even a 60-65 roll would spin like hell with 25-28 psi

meatheadgn

Thanks guys. It is good to see that I can run the tires at lower pressure without any ill effect. I can probably get by running them at about 22 or so as at my elevation I am not making full power.

Luweegy

Make PVC tank,put two sensors in it a blow it up to 30lbs and read those sensors with the front sensors. I'm @ 750/756 rwhp @ 3500 rpms on the hit.I run 18lbs and they hook if they are warm in 2nd gear.

far4162

I plan on running skinneys up front and ET Street Radials out back on 18" welds. I am giong to install all four sensors in the front whees. LF and LR in the left front wheel and the RF and RR in the right front wheel. I will mount them 180' from each other. In other words the front wheels will have two valve stems each . I will then set them to the ecu with a reset tool in hopes that the ecu will read the front pressure for the rear tires enabling me to run a lower pressure in the rear tires. I do mot know if this will work but it's worth a try

far4162

I have seen some posts stating that the sensors need centrifugal force in order to activate. If so they will not work stationary in a pvc tube.

HOXXOH

1. I don't believe anyone makes front runners (skinnies) larger than 17", so if you are doing this on a Z06, you'll need to either swap the front brakes to C6 base brakes or use an outrageous, and NHRA illegal, adapter.

2. You'll have a much better selection of tires if you stay with 17" wheels on the rear.

3. Simply turning the TC off will allow you to run without sensors at any speed. Trying to fool the system is not necessary. I ran about 8K miles sensor free and up to 130 MPH with no issues.

4. I have run as high as 85MPH on a RF tire that had 0 pressure. I doubt there is a speed limiter other than the suggested DIC warning.

far4162

Sorry I failed to state that the fronts are Weld 17" X 4.7's. I went with the 18's because I have a limited choice on tire diameters on the front tires and was tying to maintain the same diameter difference between the stock front and rear tires and found the closest match with Mickey Thompson 8 ply fronts and i think 315/35r 18's out back . Unfortunately they are already ordered. The fronts are 26X6.00R17LT MT Sportsman radials and the rears are P305/35R 18 ET Street Radials. I went back home and looked at the tires. The reAr wheels will be 18 X 11's. My Z06 has a 640 lift cam with stainles steel valves, full length Eagleheaders with no cats and makes 565 RWP. I hope this combo works at the strip.by the way, thank you very much for your input.

Bill Dearborn

Here is what I know from my own personal experience. The car will run fine for a certain amount of time if the street wheels/tires/sensors are removed but kept within 30 ft or so of the car. On an 08 the car can run on a track for a half hour without having an issue. Once you hit the half hour the system says it can't find the sensors and will slow the car down to 55 mph in corners. In a straight line I was able to go much faster than 55 but each time I had to turn the steering wheel the Electronic Brake Control Module (not the ECU) applied the front brakes heavily to slow the car to 55.

If you install the sensors in a plastic tube and pressurize to 30 psi you basically get the same time period. On an 08 that is the 30 minutes mentioned above. The moral of that story is forget the plastic tube and the cost of 4 sensors.

Placing all 4 sensors in two wheels so they are separated enough to avoid balancing issues and cross talk when trying to program the car may work very well. In fact placing all 4 sensors in one wheel would work from an electronic and programming stand point.

What you do not want is for the car to suddenly lose track of one or more sensors or for one or more of the sensors to be suddenly below 26 psi. As soon as the EBCM isn't satisfied the front brakes are applied to slow the car in corners. When a sensor failed at 120 mph just after I passed a BMW in T4 at the Glen, the EBCM slowed the car drastically just as I was pulling back in front of him. Almost got rammed in the butt as he wasn't expecting anybody to slam on the brakes with a thousand foot clear straight away ahead of them.

Bill

far4162

Bill, thank you for for sharing your informative experiences. Since I have already ordered sensors and a tool I will give it a try. I have 3 strips in my area , two are within 40 mi and one is 65 miles away. I do not have a trailer so the car will haveplenty of time to act up before arrival. Once I get them installed I will post if they work. Freddie Rambo, Andrews Texas.

LS9Drew

Your fine if you don't have any sensors in the rear tires, I was wrong earlier. I know my buddy doesn't run sensors in his DRs setup with no problems