IanA2
MB Enthusiast
Doodle
MB Enthusiast
Shame, as that would have been conclusive in showing the improvement. Ah well.
SavMan
Authorised Forum Sponsor
Post the dyno sheet and get confirmation from them if it is at the wheels or of the drivetrain loss they used to calculate the flywheel number, have you had the car remapped since your modifications?
OP
OP
biturbo
Active Member
- Joined
- May 14, 2009
- Messages
- 605
- Location
- Cheshire
- Car
- S600 BiTurbo, SL60 AMG, Landcrapper Disco, Merc sprinter, E320 D6.
no remap. I was going to do that next, but i am concerned about letting anyone do it and knacker the engine for 10-20HP.
I just rang them and they said they only do at the wheel unless i request flywheel. How confusing is this. I knew i should of kep
I just rang them and they said they only do at the wheel unless i request flywheel. How confusing is this. I knew i should of kep
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SavMan
Authorised Forum Sponsor
You would have thought so but most times is the bean counters that decide what manifold.
How much science do you think went into this manifold apart from how long will it last
Doodle
MB Enthusiast
Did old school AMG have bean counters?
Ill do a thread soon mate...
Red C220
MB Enthusiast
This isn't old skool. This is post merger.
Pre merger AMG was a blank cheque basically.
Red C220
MB Enthusiast
That equates to exactly 20% transmission loss.
On the OP's car you'd have to assume a few horses have escaped over the years. So the mods may have rounded those up and liberated a few more.
The numbers stack up in my mind.
I read somewhere that the figure was conservative due to the fact that no two engines were identical in terms of the HP they produced... 400BHP was about the minimum.
Sp!ke
Administrator
You should remap after changing your entire exhaust system parameters or you'll run a greater risk of misfuelling and consequent damage.
Doodle
MB Enthusiast
While the car itself might be built afterwards, the 6.0 119 motor was designed beforehand
/disengage pedant mode
I agree, the 20% figure seems to bear out though by current guesstimations.
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Martyn_n
Active Member
I think I am right in saying that you would be wrong to look at the transmission losses being a percentage of the flywheel power output. These losses are speed related not load related so as the torque at the flywheel increases the actual percentage losses reduce (Assuming the peak torque is measured at the same speed). The rolling road should calculate the losses within the transmission as it winds down after the power run, thereby giving you the flywheel torque measurement (probably more accurately described as an estimate).
Sp!ke
Administrator
How much science do you think went into this manifold apart from how long will it last
You'd be surprised... that looks like it is twin walled so engine bay heat soak was likely on their mind at the time.
Once the outer shell is removed it may be that the design is free flowing and full of lovely gentle curves and venturi's - they dont just bung on just anything that fits without computer modelling which I very much doubt would be done on a one off custom jobbie.
SavMan
Authorised Forum Sponsor
Correct on the twin walled it was probably due to the increased temps seen due to the increased back pressure the headers cause. Even with this they have been known to fail paritcularly at the weld nearest the cats.
A decent set of headers instead of these and you will see 25-50hp depending on the design.
