Experts only ||HELP||

Yagel

Full member
Points
21
Location
Israel
Car
Leon cupra 280 2016
Hey guys, I really need help
I own Leon cupra 5f 2016(280hp)
Running full stage 2 with intercoller, downpipe, inlets, everything except a big turbo.

I used to have 340hp & 52kgm with the same software & setup at the moment
And somehow now I'm only providing 320hp with 50kgm

I've connected Vcds made logs everything is perfect, no errors no leaks, the fuel is good , ignitions are good everything is running perfect. Still missing about 20hp & 2 kgm
Do you guys have any idea, I've tried everything and it's frustrating....
Thanks!
 
Setup-
Stertman AB (gear & engine softwares)
Downpipe Cts
Turbo inlet Cts
Turbo muffler delete Cts
Forge air intake kit
Cts intercooler
Aem water methanol kit
Rs7 plugs
 
Was it a rolling road readout that gave you 340BHP and another RR readout that gave you 320BHP? Were they on the same RR in the same conditions? Different RR can, and will, give different results. Even the same RR on different days and with different operators (if not set up in a controlled environment) may give different numbers.

Or did you use some other method to get the numbers you quoted above?
 
No errors provided on Vcds, no boost leaks, fuel pressure is good... ugggghhhhhhh help!!!
 
Was the fuel you used the same? Super unleaded makes more power than the standard stuff.

Injectors could be blocked up or losing efficiency. Warm weather also reduces power as cold air carries more oxygen than warm air.

BG fuel cleaner would be worth trying, it's the only stuff i've found that properly cleans injectors.
 
Everything is working great,
Fueling my car at the same place. Every time.
I have a friend with the same car & the same setup that provides 340whp and 52kgm
And I provide 320whp and 50kgm..

ANY OTHER SUGGESTIONS ???
 
There is a big variation in cars from the factory, I've heard some cars are 20% down on power. It's just down to manufacturing tolerances. How is the engine compression for all cylinders on your car compared to your friends?

Turbos also vary quite a bit and can lose power as they get older and wear.
 
There is a big variation in cars from the factory, I've heard some cars are 20% down on power. It's just down to manufacturing tolerances. How is the engine compression for all cylinders on your car compared to your friends?

Turbos also vary quite a bit and can lose power as they get older and wear.
The turbo is in a great condition, it's a new car I only have it one year. I was 340hp and somehow I've lost 20hp and 2 kgm ... and everything is ok with the engine , I guess - I haven't found the error
 
Sorry but 20BHP on a car that is alleged to be making 340BHP is not a big deal :confused:
As well as the factors that my good colleagues have stated, if on the day 'Temperature wise' when it went back on the RR was a few degrees warmer, that too could account for the drop. Stop worrying and enjoy the car for what it is |B
 
Sorry but 20BHP on a car that is alleged to be making 340BHP is not a big deal :confused:
As well as the factors that my good colleagues have stated, if on the day 'Temperature wise' when it went back on the RR was a few degrees warmer, that too could account for the drop. Stop worrying and enjoy the car for what it is |B
Dude, same day , same cars , same setup
We've made the same score ;(Hp& kgm)
340/52
And after about a month I've lost to the other car because I felt my car is weaker
We went on the dunk again, ran a dyno on both of us
He's running 340whp & 52kgm
I'm running 320 on 50.
 
Something happens, no one knows what happend , there's seems to be no errors at all
But something happens for sure. We've tested that and u can see the differences
 
10% is usually within the margin of error on diagnostic and rolling road equipment. You'll hardly notice a 20bhp drop in power in daily use.
It's not on a daily use , I notice that when I race people who I've already beaten and now I'm loosing , it's not the issue . The issue is WHY and how can I solve it
 
Ok, clutch ain't slipping, also same tuning software didn't change. Same as I was with no errors still 20hp less
****UPDATE**** something could happend to the exhaust system , it sounds like its choked
 
Seeing that you and a mate had your cars on the same dyno (on the same day ????) then I would ask the operator if he can print out the results for both cars on the same sheet.
power,torque and boost data to see where they vary and post it so we can get a better idea of what's happening and where the differences are .

IF they can't or won't do this then you can have your dyno sheet copied onto clear film so you can over lay it on your mates dyno sheet to compare results:)
 
Last edited:
And the same dyno on the same day can make different results.
It can't, me and my friend both Leon cupra owners stage 2, we've both been the same Hp& kgm and now he is the same as we was (340/52)
And I'm (320/50) we've done the dyno one after each other Same humidity same temp same fuel same tuner .

About the dyno graph, it's looks the exact same just I'm under his graph with hp&kgm
Same drawing same boost holding rpm just less Hp and kgm
 
It can. Which is why testers should run a car at least three times and will give you the average results. Because even three times in a row will produce different results!

I give up, you aren't supplying any info we can work with and appear to be in denial about how things work.
 
D
It can. Which is why testers should run a car at least three times and will give you the average results. Because even three times in a row will produce different results!

I give up, you aren't supplying any info we can work with and appear to be in denial about how things work.
ude we've ran each car 3 times, I'll ask for the dyno and post it here
 
My driven tyres are pumped up to 40 psi when on the dyno.

Different tyres and pressures as well as how it is strapped down on the rollers can affect the level of grip on the rollers and give different results.
So are you absolutely sure that absolutely everything is equal on both cars ?????
 
Last edited:
You have had many people tell you that a difference is perfectly normal indeed to be expected on different days on the same dyno
Its worth adding that the more you tune a car the more likely a small difference in conditions will make .

so to be exact ....
your difference is under 6% and your car has been tuned
Honestly you could get that difference on two back to back runs just by different driving style. sometimes turning the engine fan off could do it.

I have had this demostrated by a dyno specialist who managed to get 40bhp difference on back to back runs simply by changing up to the final gear at difference revs on my car .

As to losing to a car one day that you beat another day... well 20bhp out of 340 is unlikely to do that
 
Last edited:
I hope that this Saturday I'll have an answer for you guys, I'll update if the problem has solved
And sorry but 20whp and 5 kgm on a seat Leon cupra is alot
 

Similar threads


Please watch this on my YouTube channel & Subscribe.


Back
Top