Rolling roaded the car today...

plowy

Active member
i have been wanting to RR the car for a while now since i had the remap, anyway got round to it today. A local garage to me who specialise in Alfa's has a Sun rolling road which is rumoured to be fairly accurate. Had some real fun trying to get a good reading as the car either out ran the top speed of the road in 4th (120), or it was spinning up as the back end is light, so me and two young lads ended up standing in the boot to get some weight over the back end which produced a reasonable run.
in standard form the car should give 231bhp and 221lbsft torque, what it gave was the following;

251bhp@6545rpm
190lbsft torque @ 4450rpm

I am pretty pleased with the power figure but the torque figure is down on standard, however, the car definately pulls harder and cleaner and has benefitted from the map and i do not know what the torque figure was prior to the map so i don't know what to make of that but i am chuffed about the power gains... :thumbsup:

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That's very interesting, I have to say that the torque figure seems very low, if it's getting to 251bhp you'd expect it to be producing far more torque than 190 lbs.

Looks like a huge dip between 1500 and 2500 rpms, like you say down to poor traction. It should have a peak in this area, no?
 
speaking to others i am wondering if these rollers are not the best, the power is good but other things like the torque figures and dips in the power curve beg questions.....
 
Yep I'd have to agree. If you look at this graph http://www.rri.se/popup/performancegrap ... artsID=565 (for a 330Ci, same 231bhp engine as your Z though) there is a bit of a dip at 4000 rpm. Now in my Z4 this was really noticeable in a higher gear (3rd/4th), and only went away if I used 99 Optimax etc.

And it's only a small dip, maybe going down 8lbs, 10 at most. From the graph you've posted, the dip would feel like you'd put it in reverse or something, it would be that noticeable. We should organise something at Well Lane in Batley, they usually get consistent results.
 
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