Does wheel size affect tune

1ssa_camaro · 01-24-2021, 12:04 AM

I currently have long tube headers with off road x pipe, intake and a flex fuel tune. I was dyno tuned on the stock wheels that come on our cars. I wanna upgrade to 305’s in the back and 285’s in the front or some d5 forge stars with 305/45/17’s. Will this affect my tune at all? It might be a dumb question, but I’ve heard how it can affect it. Thanks

delthawk5 · 01-24-2021, 01:09 AM

wut

SS_1LE · 01-24-2021, 06:22 AM

Might affect your speedometer accuracy but that’s about it

s346k · 01-24-2021, 08:08 AM

what's the difference in tire height? as long as it isn't much i can't see the new wheel & tire causing much trouble. if it's shorter you might run into shifting issues.

need those automagic guys in here.

Invertalon · 01-24-2021, 08:21 AM

Changing tire size, tire mass, etc... Will affect how much power is required to overtake the rotational inertia differences. So a larger, heavier rim/tire combo will take more work from the engine than a smaller combination. The lighter, the better maximizing how much HP/torque gets to the road. Don't think this would result in a tune difference though, just potentially hurt your actual real world performance if the wheel/tire combination is heavier than what was there before, depending on losses due to tire width and grip and all that.

Msquared · 01-24-2021, 10:13 AM

Wheel and tire mass/inertia differences would have to be massive to have any measurable effect on power to the ground. Wheels are spinning so slow relative to the crankshaft that they aren't going to sap power unless we're talking about 20lbs difference or more. Tire diameter does make a difference to overall gearing, but the OP can upgrade to wider wheels/tires and stay within a close range on diameter if he chooses sizes carefully.

1ssa_camaro · 01-24-2021, 01:13 PM

I was looking to upgrade to 305/30/20 20x11 in the rear and 285/30/20 with 20x10 in the front

Second option is keeping the stock front wheels and tires and adding some d5 forgestars with 305/45/17 mickey thompson et street r's

grampa_ss · 01-24-2021, 01:41 PM

our cars come with 275/35/20 rears....that's a 27.6. the 305/45/17 are 27.8. not even 1mph difference up to 90mph. So that's ok. But I'm not sure about putting a 285 on our 8.5" front wheels. Maybe someone else can chime in on that.

Msquared · 01-24-2021, 03:10 PM

Quote:

Originally Posted by grampa_ss

But I'm not sure about putting a 285 on our 8.5" front wheels. Maybe someone else can chime in on that.

No, that would be a terrible idea. But the OP just said he would get 20x10 front wheels if he goes to a 285/30/20. So he's fine.

01-24-2021, 12:04 AM	#1
1ssa_camaro Drives: 2017 Camaro 1ss A8 Join Date: Nov 2019 Location: California Posts: 114	Does wheel size affect tune I currently have long tube headers with off road x pipe, intake and a flex fuel tune. I was dyno tuned on the stock wheels that come on our cars. I wanna upgrade to 305’s in the back and 285’s in the front or some d5 forge stars with 305/45/17’s. Will this affect my tune at all? It might be a dumb question, but I’ve heard how it can affect it. Thanks

01-24-2021, 08:08 AM	#4
s346k Drives: like an old lady Join Date: Jun 2012 Location: indiana Posts: 2,396	what's the difference in tire height? as long as it isn't much i can't see the new wheel & tire causing much trouble. if it's shorter you might run into shifting issues. need those automagic guys in here. __________________ 2016+ camaro: everyone’s first car

01-24-2021, 10:13 AM	#6
Msquared Drives: Chevrolet SS 1LE Join Date: Oct 2019 Location: St. Charles, MO Posts: 1,446	Wheel and tire mass/inertia differences would have to be massive to have any measurable effect on power to the ground. Wheels are spinning so slow relative to the crankshaft that they aren't going to sap power unless we're talking about 20lbs difference or more. Tire diameter does make a difference to overall gearing, but the OP can upgrade to wider wheels/tires and stay within a close range on diameter if he chooses sizes carefully. __________________ Matt Miller 2020 SS 1LE

01-24-2021, 01:41 PM	#8
grampa_ss Drives: 2016 Camaro 2SS Join Date: Apr 2017 Location: Stansbury Park, Utah Posts: 1,092	our cars come with 275/35/20 rears....that's a 27.6. the 305/45/17 are 27.8. not even 1mph difference up to 90mph. So that's ok. But I'm not sure about putting a 285 on our 8.5" front wheels. Maybe someone else can chime in on that. __________________ 2016 2SS, MRC, NPP, A8. Procharger P-1X,Stage II,std bypass, 3.9, Alky Meth - 10.84 @129 - DA+2000 New Mods - GPI drop ins, Kooks 2", LT4 fueling, Cam, Circle D Converter, 3.5 pulley & dual nozzle meth.

01-24-2021, 01:09 AM	#2
delthawk5 Drives: 2019 2SS Crush Join Date: Jun 2020 Location: Denver, CO Posts: 163	wut

01-24-2021, 06:22 AM	#3
SS_1LE Drives: 2020 SS 1LE Join Date: Aug 2020 Location: Dallas Tx Posts: 65	Might affect your speedometer accuracy but that’s about it

01-24-2021, 08:21 AM	#5
Invertalon Drives: 2021 2SS Join Date: Jul 2020 Location: Cleveland Posts: 299	Changing tire size, tire mass, etc... Will affect how much power is required to overtake the rotational inertia differences. So a larger, heavier rim/tire combo will take more work from the engine than a smaller combination. The lighter, the better maximizing how much HP/torque gets to the road. Don't think this would result in a tune difference though, just potentially hurt your actual real world performance if the wheel/tire combination is heavier than what was there before, depending on losses due to tire width and grip and all that.

01-24-2021, 01:13 PM	#7
1ssa_camaro Drives: 2017 Camaro 1ss A8 Join Date: Nov 2019 Location: California Posts: 114	I was looking to upgrade to 305/30/20 20x11 in the rear and 285/30/20 with 20x10 in the front Second option is keeping the stock front wheels and tires and adding some d5 forgestars with 305/45/17 mickey thompson et street r's

User Name		Remember Me?
Password