JKM Dyno-Day - 2nd March....

[R-tech-Nick]

Lol the usual 1% accuracy because we tune race cars quote......  No such thing dude, the closest word u can say to accurate is "realistic".   There is not one chassis dyno in the land which is accurate are there are so many factors to take into account, one being correction factors applied the the readings based on atmospheric conditions, there are around 6 factors which can be used which on a 200bhp run can vary the power between 7bhp -/+.   

In that case there must be a particularly nasty adverse conditions vortex surrounding JKM's dyno where all the negative forces come together to create the "Low" dyno. On the 2nd of March there must have been "Perfect Storm" conditions. LOL
 

Only way to find out what is going in on is log the cars on the dyno..  MAF LOAD AIT TIMING ect..

I am saying the factors are..

Coolant temp  a variation 98deg+ will make ecu reduce power up 40% reduction
AIR intake temp anything over 40deg+ will make ecu reduce power 40% reduction
Correction factors for atmos
cold bearing and drive train temps on the DD rollers will give a lower reading on the est hp
Fuel quality

[E30Dom]

cold bearing and drive train temps on the DD rollers will give a lower reading on the est hp

Interesting one, JKMs is in a outdoors 'shed' at it was a very cold night/morning...

I think its still down to loading/strapping down etc...

[flashp]

JKM's dyno is repeatable.
The most important element of any calibration/measurement is a repeatable and reproducible measurement so monitor your vehicles on one dyno only, then you'll be able to track changes with success.
If you keep changing the measurement device looking for the most favorable figures you won't know where you are.

[RedRobin]

JKM's dyno is repeatable.
The most important element of any calibration/measurement is a repeatable and reproducible measurement so monitor your vehicles on one dyno only, then you'll be able to track changes with success.
If you keep changing the measurement device looking for the most favorable figures you won't know where you are.

....Which is exactly why I only put my car on one dyno: JKM's DD 

[RedRobin]

^ The AFR (Air Fuel) may need checking using logging, although the runs showed how the ECU 'recovered' the irregularity.

[Mandy]

JKM's dyno is repeatable.
The most important element of any calibration/measurement is a repeatable and reproducible measurement so monitor your vehicles on one dyno only, then you'll be able to track changes with success.
If you keep changing the measurement device looking for the most favorable figures you won't know where you are.

....Which is exactly why I only put my car on one dyno: JKM's DD 

X2. My car's only ever been on one dyno too, best way to keep track of the car's progress. Although it would be interesting to see what it makes on another dyno... (This could well be my next power mod lol)

[E30Dom]

Repeatable...? Ok so Revo Stage 2+ is worth 9bhp over stage 2 then...

My standard car, was given Revo Stage 1 treatment by APD Performance (now VAS Works) settings B7T5F9. Made 288bhp on JKMs rollers.

Added a Pipewerx 3” DP and 200Cel Sports cat and stage 2 software, settings B7T5F9 and made 272bhp on JKMs Rollers.

JKM then added an APR Fuel Pump, EVOMS induction kit and BCS 3” Cat back sports exhaust and setting B8T5F7 made 309bhp on JKM rollers. . Later on changed to B8T5F8 as I was getting quite a lot of soot deposits on the bootlid.

An S3 intercooler was fitted, and JKM put Stage2+ file on with settings B8T5F8.

Paul at VAS Works logged the car Thursday 28th Feb 2013 and tweak settings to B8T6F8. Was meeting all requested values. March 2nd 2103 car makes 318bhp on JKM rollers.

Car is run exclusively on V-Power. Serviced every 6-8k miles. Has a Rev G diverter valve which is in good condition still and the latest revision coilpacks and PCV valve. It was service at the beginning of February. Also has a Sachs uprated (400lbft) clutch and new DMF.

Revo have had this information and have not got back to me...

[Mk5 GTian]

Repeatable...? Ok so Revo Stage 2+ is worth 9bhp over stage 2 then...

My standard car, was given Revo Stage 1 treatment by APD Performance (now VAS Works) settings B7T5F9. Made 288bhp on JKMs rollers.

Added a Pipewerx 3” DP and 200Cel Sports cat and stage 2 software, settings B7T5F9 and made 272bhp on JKMs Rollers.

JKM then added an APR Fuel Pump, EVOMS induction kit and BCS 3” Cat back sports exhaust and setting B8T5F7 made 309bhp on JKM rollers. . Later on changed to B8T5F8 as I was getting quite a lot of soot deposits on the bootlid.

An S3 intercooler was fitted, and JKM put Stage2+ file on with settings B8T5F8.

Paul at VAS Works logged the car Thursday 28th Feb 2013 and tweak settings to B8T6F8. Was meeting all requested values. March 2nd 2103 car makes 318bhp on JKM rollers.

Car is run exclusively on V-Power. Serviced every 6-8k miles. Has a Rev G diverter valve which is in good condition still and the latest revision coilpacks and PCV valve. It was service at the beginning of February. Also has a Sachs uprated (400lbft) clutch and new DMF.

Revo have had this information and have not got back to me...

  That's a hell of a lot of work for an extra 30 bhp. That can't be right can it?

[R-tech-Nick]

Why u looking at peak numbers?   I would be happy spending £500 to gain 8bhp "peak". But gaining 30-45lbft across the midrange to give greater average power / area under the curve.    These sort of power gains can only be see if your running your car on the same dyno and over laying graphs each time you make changes to your car.

A rr day will only give u one 2 reading peak torque and peak hp at there relative rpm points.   Red robin is happy with his car as he had 100s (lol) of dyno plots from the same dyno showing where each mod has made / lost power.

Dynos are tools for tuning, safe logging and to visualise whats going on with the mapping.  They where never build for rr days.

[rich83]

Why u looking at peak numbers?   I would be happy spending £500 to gain 8bhp "peak". But gaining 30-45lbft across the midrange to give greater average power / area under the curve.    These sort of power gains can only be see if your running your car on the same dyno and over laying graphs each time you make changes to your car.

A rr day will only give u one 2 reading peak torque and peak hp at there relative rpm points.   Red robin is happy with his car as he had 100s (lol) of dyno plots from the same dyno showing where each mod has made / lost power.

Dynos are tools for tuning, safe logging and to visualise whats going on with the mapping.  They where never build for rr days.

Says the man who  at the start of the year hosted one of the biggest Rolling Road days in the history of Rolling Road days 

[Hedge]

He's right about the peak numbers being irrelevant though Rich.

So why does everybody concentrate on them? 

[rich83]

He's right about the peak numbers being irrelevant though Rich.

So why does everybody concentrate on them? 

Because saying that your car has 300bhp for example is more impressive than saying it makes 280bhp but on average more power from 2000-5000 RPM.

[RedRobin]

Dynos are tools for tuning, safe logging and to visualise whats going on with the mapping.  They where never build for rr days.

Says the man who  at the start of the year hosted one of the biggest Rolling Road days in the history of Rolling Road days  

....Yes, but hosting a Rolling Road day is just providing an enthusiasts' meet and some extra income towards the substantial cost of buying a rolling road as a workshop tool. I'm sure that JKM would say the same.

It's also an opportunity for us to see if there is anything fundamentally needing attention - A general health check.

[RedRobin]

Because saying that your car has 300bhp for example is more impressive than saying it makes 280bhp but on average more power from 2000-5000 RPM.

....Also known as 'Willy Waving' 

[R-tech-Nick]

Lol. My RR days are for "fun" an excuse to meet up have a laugh and sniff each other fumes..  My rr days are made to me fun, prizes for cars with low power ect..  If some one want to know how there car is running and what power it's at I will spend a good hour on the car logging and running then comparing data to give reasons why car is running x power on the dyno.

As for peak Bhp being the buzz number we all chase... What other number can we quote to give an indication of power?