Performance drop from switching from 410 to 373
Performance drop from switching from 410 to 373 I just bought a 94 z28 with 410 in the back and was wondering how much of a drop in performance there would be and how many gains in mileage i might see. I havent been able to find a straight answer. The car runs a 12.5 as it sits
Last edited by brickonwheels; Mar 11, 2006 at 11:14 AM.
its an m6, the complete mod list as i bought it is
ASP Crank Pulley
Pro 5.0 Shifter
Hotchkis Stabilizer
Hotchkis Lower Control Arms & Panhard bar
K&N Filtercharger
Airfoil
4.10 gears
160deg Thermostat
Hooker Long Tube Headers
Hooker Y Pipe
Mcleoud 6 Puck Clutch
SLP Lightweight Flywheel
SLP 2OTL Exhuast
PCMforless Programming(tuned for 92octane)
Carbon Fiber Drive Shaft
MSD Ignition w/ Performance Plug Wires
Crane Gold 1.6RollerRockers
Manely Valve Springs
Titainium Retainers
Eibach Pro-Kit Springs
KYB Adjustable Shocks and Struts
EGT Guage
Vacum Guage
New Nitto555II Tires mounted on perfect condition Chrome Z06 rims
I am curious beause i might be daily driving it and 15 mpg is just shitty when you drive 500 miles a week gas money is a bitch
ASP Crank Pulley
Pro 5.0 Shifter
Hotchkis Stabilizer
Hotchkis Lower Control Arms & Panhard bar
K&N Filtercharger
Airfoil
4.10 gears
160deg Thermostat
Hooker Long Tube Headers
Hooker Y Pipe
Mcleoud 6 Puck Clutch
SLP Lightweight Flywheel
SLP 2OTL Exhuast
PCMforless Programming(tuned for 92octane)
Carbon Fiber Drive Shaft
MSD Ignition w/ Performance Plug Wires
Crane Gold 1.6RollerRockers
Manely Valve Springs
Titainium Retainers
Eibach Pro-Kit Springs
KYB Adjustable Shocks and Struts
EGT Guage
Vacum Guage
New Nitto555II Tires mounted on perfect condition Chrome Z06 rims
I am curious beause i might be daily driving it and 15 mpg is just shitty when you drive 500 miles a week gas money is a bitch
Last edited by brickonwheels; Mar 11, 2006 at 11:37 AM.
With a 26" tire as a guess on my part 75mph is just 2000rpms going to 3.73s will either make 6th almost unusable or you will use it when you shouldn't and end up lugging the motor.
Your problem is elsewhere. My 2800 stall 3.42 cammed Caprice get 18-23 depending on the type of driving and with the lesser OD of the A4 I am turning higher rpms.
Your problem is elsewhere. My 2800 stall 3.42 cammed Caprice get 18-23 depending on the type of driving and with the lesser OD of the A4 I am turning higher rpms.
Changing those gears won't get you much, if any mpg gain. It could be the tune, since you said it's for 92 octane. The 1.6 RR will decrease your mpg as well. Check the plugs and the O2 sensors, those will keep your mpg up. I'd be happy with 15 mpg and those 1.6 RR, in the city at least. That's what I get and my engine is 100% stock AND a whole second slower. 
I get 18-23 out of BOTH of my cars, pure city I could see maybe dipping to 16. I attribute the similar milage of the well modded car to the stockish one to the lighter weight and headers on the modded one. Both are a good bit heavier than yours, maybe you just need to play with your shift points and what gear you use at what speed to improve your milage. You lug it a lot and milage will fall faster than if you were using a little too many revs.
