JoeDirt

Hey ,

Were hooking my car up sat to a dynojet dyno with a wide band to tune the air fuel ratio after a cam and exhaust swap. . . how much better is a mustang or dynometer dynamics "real load" dyno for tuning ?? Is tuning on the dynojet pointess ?? Is there anything we have to ignore with the dynojet ??

Also I have cats in place in my kooks Y pipe . . . . does this effect the wide band readings from the tail pipe sniffer ?? Would a 13.5 through cats really indicate a 12.5 or similar ??

Thanks

moehorsepower

iTrader: (3)

The difference is in the load bearing.On a dynojet your load is initiated at WOT.On a Mustang Dyno you can put a load to represent "crusing" speeds such as on the Highway.Also on a Mustang you usually see lower numbers due to the different type of load application.There is nothing wrong with tuning on a Dynojet.Not saying Mustang Dyno's are bad but look,read and see the number of Dynojets that are being used.As a tuner I always go for a driveability test to assure road manners,this is where the Mustang Dyno shines,you can do the driveability on the Dyno saving time......

MyLS1Hauls

iTrader: (2)

The load cell dynos are definitely better for tuning than a dynojet...You can actually adjust how fast you want to motor to gain rpm at WOT with a load style, which can be more like real life street conditions. Dynojets have 2500# rollers, which are significantly lighter than your 3500# car. You need to install the sniffer upstream of the cats for an accurate indication of A/F.

JoeDirt

Good info !!

How far skewed will my AF readings be with the cats ??