****Problem Please Help*****
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 17
Likes: 0
****Problem Please Help*****
So Im have a problem no sure what to do here
im running the 19x12 with toyo 345/30/19
and fronts 19x10 295 30 19
im have fantom check engine light coming on with service rear diff message
No codes for the check engine light and it comes on at wot then turns off after wards
im supper confused and not sure what to do to fix it
Help Please?
im running the 19x12 with toyo 345/30/19
and fronts 19x10 295 30 19
im have fantom check engine light coming on with service rear diff message
No codes for the check engine light and it comes on at wot then turns off after wards
im supper confused and not sure what to do to fix it
Help Please?
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 17
Likes: 0
30k miles currently
long tube header cat deleted x pipe
afe intake
race fuel tune and pump gas tune
supercharger pulley kit
plugs and wires
catch can
dash logic obd monitors for wide band gauges
wheels and tires thats it i think
diff fluid changed at 27k
long tube header cat deleted x pipe
afe intake
race fuel tune and pump gas tune
supercharger pulley kit
plugs and wires
catch can
dash logic obd monitors for wide band gauges
wheels and tires thats it i think
diff fluid changed at 27k
Last edited by vicq; Jul 16, 2020 at 11:33 AM.
Racer
Joined: Jun 2019
Posts: 386
Likes: 149
im thinking a battery issue first. Your voltage may be dropping during a pull.
Second. see what your R/F tire diameter ratio is. If too far form 1.03 then you may be messing with the stability control systems (although it would usually flash the sliding car light)
Second. see what your R/F tire diameter ratio is. If too far form 1.03 then you may be messing with the stability control systems (although it would usually flash the sliding car light)
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 17
Likes: 0
battery says its at 12.5 or more so maybe intermediate bad cell in it
would i need to change the front to 285/35r19 and would that cause a rubbing issues at stock height on the bolts
Last edited by vicq; Jul 16, 2020 at 12:13 PM.
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Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,475
From: South Florida
You potentially need to have the car tuned for the different tire sizes. If the height difference is too far off the car will think there is a problem with the differential. This is probably what is happening. You need to measure your tire height/diameter/circumference and have the tune updated with the new values.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 17
Likes: 0
You potentially need to have the car tuned for the different tire sizes. If the height difference is too far off the car will think there is a problem with the differential. This is probably what is happening. You need to measure your tire height/diameter/circumference and have the tune updated with the new values.
have you done this and know that it will work on this type of issue?
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,475
From: South Florida
See this thread for more info: https://www.corvetteforum.com/forums...lp-please.html
Last edited by Internets_Ninja; Jul 16, 2020 at 01:37 PM.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 17
Likes: 0
so correct me if im wrong here but
it go to 285/35/19 front instead of my current 295/3019
stay with 345/30r19 rears that would be acceptable to the car ???
it go to 285/35/19 front instead of my current 295/3019
stay with 345/30r19 rears that would be acceptable to the car ???
Last edited by vicq; Jul 16, 2020 at 01:56 PM.
Burning Brakes
Joined: Apr 2019
Posts: 881
Likes: 256
From: Phoenix, AZ
295/30/19 combined with 345/30/19 is perfectly acceptable. Very common tire sizes. Stock tire ratio is 1.035% and this combo is 1.04%. If those are your sizes, that is not your problem.
Last edited by Creatre; Jul 16, 2020 at 02:26 PM.
Thread Starter
Heel & Toe
Joined: Jul 2020
Posts: 17
Likes: 0
that helps thank god lol thought i messed up
these are copy and pasted from my tire rack order confirmation
345/30R-19 TOYO PROXES R888R SL
295/30ZR-19 TOYO PROXES R888R XL
these are copy and pasted from my tire rack order confirmation
345/30R-19 TOYO PROXES R888R SL
295/30ZR-19 TOYO PROXES R888R XL
Last edited by vicq; Jul 16, 2020 at 02:41 PM.
Advanced
Joined: Jul 2019
Posts: 54
Likes: 25
From: Vancouver, British Columbia
Stock Z06 front tires are 25.8" dia and rears are 26.6" dia, a difference of .8" Your 295's are 26" dia and the 345's are 27.2" dia a difference of 1.2". The threshold or maximum differential between front and rear tire dia is 1" and the combo your running exceeds that. A 285 dia is 26.6" so the difference with the 345"s would be .3" well below 1".
Burning Brakes
Joined: Apr 2019
Posts: 881
Likes: 256
From: Phoenix, AZ
Stock Z06 front tires are 25.8" dia and rears are 26.6" dia, a difference of .8" Your 295's are 26" dia and the 345's are 27.2" dia a difference of 1.2". The threshold or maximum differential between front and rear tire dia is 1" and the combo your running exceeds that. A 285 dia is 26.6" so the difference with the 345"s would be .3" well below 1".
26.6/25.8 = 1.031 and 27.2/26 = 1.046 which is fine.
Taken from Bill D in another thread: The car doesn't know what diameter tire is installed. It only knows the stock difference in wheel speeds when going down the road in a straight line at a steady speed. Use a ratio to set your tire diameters for the C7 it is the ratio of rear diameter divided by front diameter.