Finally Rolling Roaded and not what I expected

what megane do you have? rs 250? did you dyno it stock on the same set of rollers? before and after are really important and especially on the same dyno to get a decent comparison.

what was your power at the wheels?

what were you expecting bhp wise?

panel filter is sound not performance to be honest.

decat will mean you can run her leaner but obviously wary of temps and dyno afra are never true real.world ones just as an fyi.

but for the mods and the front mount fuelling looks ok.

need to check your other temps on the car when it was being ran but three almost identical back to back runs is not bad.

I'm no fan of dynodynamics having personally ran one for a few years and found it a bit of a crap shoot having to be "corrected" a lot for people.

but... three identical runs almost and if no silly bollocks with the dyno to get those figures it seems that's what she ran.

remember every car runs differently. two identical models.with the same mileage mods and identical maps will run different hp.

hope some of that if any helps a little.

but what was she stock on those rollers is the biggest question.

 

any other megs been on the dyno that day with circa 300hp setups on them? what did they run with similar mods?

I know this probably doesn't help but it's a starting point to look at to compare.

 

Too blurry to make out all the data.

Pretty poor if that's been mapped, are you sure it's not been reset or overwritten? Mines not got half that stuff, fmic and a filter neither of which give more power and did 304 once mapped would have expected yours to nudge 310.

 

Does seem low, mine made 262 no map and 304 after from a local re-mapper so deffo not RST level, no other mods, maybe it's the place doing the remap.

Have they done these cars before? Does seem a pretty busy place from the website.

 

do you know who it was mapped by? does seem low in comparison to others.

 

Think it is hard to say, as you did not to get it on a rolling road when it was stock, your engine could have been been under 250 as stock, and the gains you have seen could actually be good, but with no base figure to go by it is hard to say

 

Don't tit about with it, get a tank of 99 Ron through it and let RST live map it. Should be good for about 310 bhp.

 

I've got a similar set up, Forge FMIC, sport cat + scorpion zaust and got 324bhp once mapped. Still need to verify the figures as the torque was just ridiculous (400 ftlb). This was an local mapper mind, but the bhp was around what I was hoping for (a little higher).
As an indication, it made 290 on a bluefin stage 2 map before (which was terrible and hit boost cut limping to 280).

I guess the only real things to consider are crappy fuel, spark plugs or a duff map? I seem to remember a bloke here T&Biscuits having low figured before, that was down to a defective intercooler.

 

Yea, mine was a duff Airtec intercooler. Who mapped it?

 

What was the problem with airtec?

 

Lack of flow in the cores. Apparently.

 

Don't be fooled by dynos , the best way to truly measure power its by 1/ 4mile trap speed or other test like for example 100-200km with a vbox etc...on stock turbo its best to shift at 5800-6000 rpm no more than that ---7300 in your case its just make the car slower.
Regards-

 

Probably a generic map on it.

 

I've got Wagner intercoolers on my B5 RS4 great bit of kit with good results

 

Couple of things from the graphs:

- fuelling a bit scatty to start of with but the general trend is progressive enrichment with an increase in RPM. From a combustion point of view maximum power at any given engine speed is around lambda 0.88 which is 12.96:1 in old money. Because you're running a turbo, enrichment goes beyond this to keep cyl temps down using the fuel as a coolant which is normal.
- you get a slight lean in fuelling around 5000rpm and a corresponding increase in torque, or rather a reduction in the rate of torque decreasing. This then gives you a slight raise in HP. That is where you are producing your peak BHP. Is that the expected peak power RPM point on one of these? I'd have thought not.
- the torque and power plots should cross at 5250 RPM. This is due to the relationship between torque, rpm and power. Power= (torque x RPM)/5250
- your graphs do not cross here which suggests to me the dyno operator has smoothed the data too much or it's not running SAE
- the dyno should run dynostack which is a weather station used to monitor temps, pressure and density which will feed directly to the dyno computer to make corrections to the figures to account for atmospherics. So don't worry about that.
- something as simple as plug gap or condition could be holding it back a little. Or a split pipe or leaking DP etc.
- if you were to hold torque for just a further 500RPM you would see a corresponding gain in power and probably got that c300BHP value which everyone is so desperate for.


RS 175 Cup Lux

 

Having same problems with my car..
Running almost same mods.
Dyno both on stockmap and mod. 2different dynos just to be sure.. same result. 275 stock, 290 mod..

 

Torque and power will only cross at 5250 if on the same scale. On this plot they are not that is why they not cross at 5250.

 

Yeah just spotted that! 100ftlbs is about 90 BHP on that scale so fair enough


RS 175 Cup Lux