** DYNO RESULT **
I don’t have a before dyno. so this is just a ‘spot dyno’ to see how its doing.
Car:
45,000 miles
BBR 175bhp remap
Cobolt Backbox
Last service @ 40,000 miles.
Dyno done in 5th gear
99 Octane
9*C ambient temp
Results:
157bhp @ 6,375rpm
145lbft @ 3427rpm
Redline @ 7270rpm
graph below.
The results seem to be on par when compared to similar modifications and engine/crank HP dynos done by US ND1 owners over at miata.net.
If you’re happy with the results, that’s all that matters 
Oops, looks like I was half asleep last night, sorry 
I thought the lower than normal figures were wheel horsepower. Wide awake and reading your dyno chart again, it’s actually engine/crank horsepower. Compared to BBR’s dyno chart, your car’s peak RPM figures are a bit off especially the torque:
Something is amiss here.
if you read above on this topic i did focus on the rpm peak bit. the published dyno sheet from BBR here is misleading, as they have cut off where the redline actually is. instead they just cropped the graph to end at 7k.
i have had the map on now for 2 weeks, and i am still getting no response from them. such as simple questions i had about changing race roms, reapply base maps if needed, and the outcome of my mandatory log file to them.
2 weeks, a few emails, and 3 phone calls all which end ‘‘we are busy’’. (this was after it took almost 14 days for the ecu to be shipped to me after i purchased it. )
i havent told them about the dyno. i dont expect more input than ive had so far 
But, also i dont have a base value for my mx5. and ive never used this dyno before for any of my cars. If anyone is Scotland based with an ND of any flavour and wants to back-to-back some dynos i’d love to compare and have coffee 
i can travel.
As per my road testing, i dont believe theres any difference in the car vs oem until the 5,500ish mark. but where i live i almost daily need to overtake a slow car, tractor, lorry, all sorts in my part of the land. and the map has really helped with the continuously pulling beyond the previous soft redline. helps when shifting up a gear as you are then starting higher into the powerband.
im not happy with the dyno number, but without being able to reapply the base map (or at least, BBR not telling me how to) i cant get to a dyno for a back-to-back. which means i just have to assume its an improvement on whatever i had previously…
I’ve had my ND2 with its standard map measured on a Dyno Dynamics dyno. I was going to do it again weeks ago since having both high flow catted centre section and exhaust fitted last year. Having said that, I just realised I don’t actually know what gear it was measured in.
I do remember 3 attempts were done whilst watching and the best result out of them was only printed. Was one of your attempts done in 4th gear?
I ask because over at miata.net, Keith from Flyin’ Miata said the following:
Tests were done in 4th gear, as we’ve found that’s the best gear for testing an ND. 6th is the 1:1 gear but that means wheel/roller speeds of 185 mph and the car will actually start to close the throttle early in both 5th and 6th gears as you get into speeds that the car simply can’t attain on the road.
Source: 2019 dyno test from Flyin' Miata - MX-5 Miata Forum
This may not apply to remapped NDs but could be something to consider?
interesting. i hadnt seen this comment, but i had seen others saying ‘dont do 6th, use 5th’ as 6th has the 1:1 ratio but the wheel speed (as you have said) would be too fast).
i thought the defacto on the ND was 5th gear?
That being said… the dyno plot is down across the board, and not just from a fixed wheel(drum) speed of say 1xxmph+, so i dont think thats an issue.
Runs were all done in 5th on mine.
I can’t help I’m afraid, but I can confirm that you’re not the only person to get delayed and grumpy responses from BBR. I really rate their stuff, but I wish they were big enough to have a proper customer service team like Flyin’ Miata for example. I do have some sympathy for them, but they can be gruff buggers. When I contrast it with my experience with Tom at Fast Forward Superchargers, who provided speedy, personal lifetime support, they’re very much the other end of the spectrum.
A little extra item…
(Still havent had a log file revie from BBR…)
I was looking at the markers today, and saw a ‘Torque Desired’ and ‘Actual’. ooooo
Ran this live on the dashboard and saw interesting numbers, so did a data pull.
As below:
What you are looking at is a 3rd gear pull from 1800 to 7200rpm (green)
then Desired Torque (i.e… what the Map is asking for) (Blue)
and Actual Torque. (yellow).
What i can get from this data, is the Desired is a pretty flat 220-229Nm from 2700 upto 5200.
but my Actual (and i would love to know how the ECU calculates this…) peaks briefly at 209, but typically looks about 20Nm short across the bulk of the core rpm range. @ 2600 rpm (the dip) is about 40Nm short!
See image #2 where ive zoomed in the just the Torqe outputs. you can see where the Actual is far from the Map.
What does this mean in real life?
Well, my Dyno plot above recorded 197Nm. so, based on this ecu output it looks like that was pretty close! (or the ECU is close… whichever you take as True).
it also means that BBRs claimed 162lbs ft matches with the Desired (229nm = 168lb ft).
As far as i know, my car doesnt have any defects or running issues. and when checking the outputs ive not got ignition or knock issues. (running 99). so im not sure where the engine could be pulling power, or is the map targets simply unobtainable?
I have read that if this is a ‘‘torque based map’’ (is it? dont know) that it will try to match the torque request based on engine speed, and load and so will open the throttle accordingly.
looking at my chart, my Throttle Position (%age) is fixed at 91.7%. not sure if thats normal…
investigation continues…
Throttle position does indeed max out at 91%
So ive pulled data logs, and made my own Dyno sheet. all purely from the ECU and its ‘‘Actual’’ reading of Torque (nm).
Ive converted into lbft, and pulled all the data log points into a dyno graph.
here it is:
In summary,
Torque Peak = 154lbft @ 4522rpm (but 150+ from 3200 to 5000!)
BHP Peak = 178bhp @ 7158rpm
conclusion…
I’m going to find a different dyno operator.
(also BBR finally got back. they are happy with the map and its output. they also recommended ‘try 4th gear’ on the dyno
My understanding is that desired torque has to be higher than actual otherwise the ECU will close throttle, limiting torque. Therefore the limits / requests have to be unobtainable to ensure full throttle is reached.
The map / car uses acceleration values in a speed vs TPS (throttle position) table - which is effectively torque based as you said, since it goes through calculations to determine what torque is required to move the mass / coefficient of drag / gearing / wheel radius etc of the car to create the desired acceleration value.
Thank you! this makes sense to me.
interestingly ive got a full power pull in the base map too. ecu was closing the throttle drastically from 6300 rpm to redline. but, there wasnt troque parameters on the oem outputs so i cant graph the bhp changes.
anyway, i hope this info im putting in will help someone out at some point. its going to be a god look-back for myself
It certainly is, thank you for sharing!
On that note, I will be releasing a full “How to tune the ND” guide early next year, I think you’ll find it interesting.
The throttle closure from 6300rpm on the OEM map is due to the way the liniter is set up. There is a throttle closure value, a fuel cut value and a “hysteresis” value (is used to have a different limit in each gear - 1st and 2nd are around 300rpm higher than the rest). There’s also weird intake cam timing from 6000rpm upwards on the ND1 2L which effectively suffocates the engine. Both of these will have been removed / adjusted in the BBR map.
