Lee H
14-11-11, 05:59 PM
As some of you will know or remember I brought this car to the North West rolling road day at Minisport last year and some people with XE's got some interesting (flattering) results from this dyno lol My MR2 made 265bhp @ 0.9 bar on that day with 220 ft/lb of torque.
This weekend I got the car remapped after fitting a new fuel pump and a metal head gasket. The rollers this weekend were Dyno Dynamics rollers. We ran it at 0.9 bar same as Minisport before adjusting the map at all and made 200bhp. Obviously 65bhp is a massive variance and is not linked to just swapping a headgasket and fuel pump as no changes had been made to the fuel pressure regulator.
Had the car remapped to 1.2 bar and made 260bhp at the fly, 218bhp at the wheels with about 260ft/lb of torque. Previously it had been mapped to 1.1 bar but was never ran on the other rollers at this pressure. So according to these results i'm 5bhp down running an extra 0.3 bar of boost, total rubbish I think lol
Car feels so much quicker than it did before at 1.1 bar so the power is definitely higher. People on the MR2 forum are claiming to have made 300bhp on the same spec but none on the same make of rollers.
Someone has also said the gear the run was done in can make a difference to power figures as well, someone basically ran the car back to back and made 20bhp more running in 3rd than 4th? Anyone else got any thoughts on this? Stuart maybe?
Graphs below for anyone interested. (don't know why PB won't rotate them)
http://i192.photobucket.com/albums/z163/Lee_H25/138805e5.jpg
http://i192.photobucket.com/albums/z163/Lee_H25/65440ff4.jpg
Certainly makes me feel better about my 1/4 mile times if i'm as down on power as much as these results suggest :d
This weekend I got the car remapped after fitting a new fuel pump and a metal head gasket. The rollers this weekend were Dyno Dynamics rollers. We ran it at 0.9 bar same as Minisport before adjusting the map at all and made 200bhp. Obviously 65bhp is a massive variance and is not linked to just swapping a headgasket and fuel pump as no changes had been made to the fuel pressure regulator.
Had the car remapped to 1.2 bar and made 260bhp at the fly, 218bhp at the wheels with about 260ft/lb of torque. Previously it had been mapped to 1.1 bar but was never ran on the other rollers at this pressure. So according to these results i'm 5bhp down running an extra 0.3 bar of boost, total rubbish I think lol
Car feels so much quicker than it did before at 1.1 bar so the power is definitely higher. People on the MR2 forum are claiming to have made 300bhp on the same spec but none on the same make of rollers.
Someone has also said the gear the run was done in can make a difference to power figures as well, someone basically ran the car back to back and made 20bhp more running in 3rd than 4th? Anyone else got any thoughts on this? Stuart maybe?
Graphs below for anyone interested. (don't know why PB won't rotate them)
http://i192.photobucket.com/albums/z163/Lee_H25/138805e5.jpg
http://i192.photobucket.com/albums/z163/Lee_H25/65440ff4.jpg
Certainly makes me feel better about my 1/4 mile times if i'm as down on power as much as these results suggest :d