How does the Overhead MPG Computer work?

From : hawkdoc

Q: roy wrote i am going to convert my 17 wheels to 22.5 alcoas. this will increase my tire height 6. is it possible to recalibrate the speedometer 15% any help will be appreciated. steve what will that change do to your gearing roy it will probably help if he has 4.10s. 4.10s are way too low. -- ken i dont know 6 is a lot. have to remember that a cummins operates best at a certain rpm range. i have no problem with the 410s in my truck. roy .

Replies:

From : mike simmons

on sun 30 oct 2005 132454 -0500 roy roy@home.net wrote on sat 29 oct 2005 171936 -0400 roy roy@home.net wrote just moved the plow out of the garage and now it is snowing. should be a helluva winter!! roy good luck!! im glad youre ready cause im not. 58 degrees around here today and im loving it. denny no way this will be plowable. i still have to come up with some compensatory weight. dont go there.g roy i guess the freight charges to get bugs there would be counter productive right bro you would be correct. the deal with transporting the friggin rabbit is the added expense of the permits and escort vhicles for the wide load. perhaps one of those catapult things you build sorry the name escapes me tr... something. maybe ya could sort of launch him this way. roy i think he would overload a treb bro.. they usually threw 250 pound rocks.. on the good side since the trajectory is at about a 45 degree angle he might gain distance with proper use of the ears as flaps.. mac please remove splinters before emailing yeah and on the way down he can use the cottontail as a drogue chute... ^ mike .

From : tom lawrence

roy that will change my 4.10s into 3.55s or 3.65s. effectively putting 70mph at 1800 rpm which will save a lot of fuel. it will make the ride smoother quieter and increase tire life to more than 200k miles. additionally it will add significantly more life to the truck. we are fortunate to have both the brakes and the suspension to handle the mod. the gm product cannot without extensive suspension changes. unfortuately it also adds 25lbs in unsprung weight at each wheel so the shock absorbers should also be changed to gas type. this change will set me back about $5000 all in though. steve steve will your payback be equal to your outlay obviously the cool factor has to fit in there somewhere though ^ mike i am going to convert my 17 wheels to 22.5 alcoas. this will increase my tire height 6. is it possible to recalibrate the speedometer 15% any help will be appreciated. steve what will that change do to your gearing roy .

From : johnny thunder johnny

roy wrote roy wrote i am going to convert my 17 wheels to 22.5 alcoas. this will increase my tire height 6. is it possible to recalibrate the speedometer 15% any help will be appreciated. steve what will that change do to your gearing roy it will probably help if he has 4.10s. 4.10s are way too low. -- ken i dont know 6 is a lot. have to remember that a cummins operates best at a certain rpm range. i have no problem with the 410s in my truck. roy we really dont know what the final drive ratio will be until he picks out a tire profile. if it ends up being the 15% difference that he quoted it will make it drive like it had 17s and 3.481 rear gears. thats pretty close to the gears that i have. if he were using it for heavy hauling the 4.10s would be a better choice but i dont think hed be putting 22.5s on it then. -- ken .