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Z4 E85 N52B25 performance upgrade

and for the 2,5 liter there is no supercharger I contacted ESS like 4 times they only have a kit for the 3,0 . As far as I have researched for the N52B25 there is no supercharger available . I could install a shrick cumshaft taht would give me another 20-30 HP but thats more of a racecar mod then a normal usage fun car :)

The only sollution in my case can be swap to a N52B30 and supercharge it
 
Scarp said:
The power was measured on 2 different dyno´s a year on from the other

Both same resault :)
Click to expand...

One supercharged 2.5 :driving:

This is the first E89 they've done so might not be on the market yet.

BPC%20Dyno_09132017.jpg
 
write them like 5 times yesterday I got a reply sorry we need a car to make a soft for the 2,5 N52 so no kit yet available . That was directly from ESS
 
A big thing in the states they love is buying our N52 manifolds, We have two disa's giving the higher bhp figures. They don't have them over there I'm lead to believe.
[/quote]

This is the same as I've read in my research for more power out of the N52B30 (without spending £5k+ on a S/C)... the states have 325/328 that run a de-tuned version of our (UK) 3.0si, they all seem to switch out the inlet manifold for the one we get as standard! Using the inlet manifold is well known BMW trick for restricting power, pity is the 3.0si already gets the best BMW produce! Presumably fitting a 3.0si manifold to 2.5si will give a bit more power on the E85, good news for those on here with a 2.5si! :thumbsup:

Curious as to how you get a dual DISA valve set up working on a car that's only designed to run 1 though... would you have to splice another connector into the ECU?
 
Scarp said:
and for the 2,5 liter there is no supercharger I contacted ESS like 4 times they only have a kit for the 3,0 . As far as I have researched for the N52B25 there is no supercharger available . I could install a shrick cumshaft taht would give me another 20-30 HP but thats more of a racecar mod then a normal usage fun car :)

The only sollution in my case can be swap to a N52B30 and supercharge it
Click to expand...

I don't believe there is a Shrick CAM that fits the 3.0 N52 and definitely not the 2.5.

It's not in Shrick's catalogue, only on reseller websites. On those websites it has the same part number as the N54 cam so i think it's just being mis-advertised.
 
Chris1981 said:
A big thing in the states they love is buying our N52 manifolds, We have two disa's giving the higher bhp figures. They don't have them over there I'm lead to believe.
Click to expand...

This is the same as I've read in my research for more power out of the N52B30 (without spending £5k+ on a S/C)... the states have 325/328 that run a de-tuned version of our (UK) 3.0si, they all seem to switch out the inlet manifold for the one we get as standard! Using the inlet manifold is well known BMW trick for restricting power, pity is the 3.0si already gets the best BMW produce! Presumably fitting a 3.0si manifold to 2.5si will give a bit more power on the E85, good news for those on here with a 2.5si! :thumbsup:

Curious as to how you get a dual DISA valve set up working on a car that's only designed to run 1 though... would you have to splice another connector into the ECU?
[/quote]

I don't think so as the 2.5si is a true 2.5L engine whereas the 325/328 in the US is a 3.0L with the restricted manifold as you say.
 
Darkangelv2 said:
Chris1981 said:
A big thing in the states they love is buying our N52 manifolds, We have two disa's giving the higher bhp figures. They don't have them over there I'm lead to believe.
Click to expand...

This is the same as I've read in my research for more power out of the N52B30 (without spending £5k+ on a S/C)... the states have 325/328 that run a de-tuned version of our (UK) 3.0si, they all seem to switch out the inlet manifold for the one we get as standard! Using the inlet manifold is well known BMW trick for restricting power, pity is the 3.0si already gets the best BMW produce! Presumably fitting a 3.0si manifold to 2.5si will give a bit more power on the E85, good news for those on here with a 2.5si! :thumbsup:

Curious as to how you get a dual DISA valve set up working on a car that's only designed to run 1 though... would you have to splice another connector into the ECU?
Click to expand...

I don't think so as the 2.5si is a true 2.5L engine whereas the 325/328 in the US is a 3.0L with the restricted manifold as you say.
[/quote]

The uk 2.5si already has the “full power” inlet manifold, I think you must be thinking of the 2.5 non si model that’s about 170 odd bhp :thumbsup:
Rob
 
Even bmw’s Renowned M division could only extract 106bhp/litre from the mighty s54 engine with its bucket & shim valvegear and spinning the engine up to a stratospheric 8500rpm.
The n52 is acknowledged universally to be nowhere near as strong (the forced induction kits run low boost & they will not approach the rpm limits of the M engine) yet you say your remapped 2.5 produces approx 102bhp/litre while only revving to 7000rpm?
I’m amazed :o
Rob
 
Smartbear said:
Ducklakeview said:
Scarp said:
Here´s the dyno sheet

13327383_969992326448636_6371641669698678403_n.jpg
Click to expand...

Looks like hard evidence to me!

Mike
Click to expand...

The bhp & torque curves are supposed to intersect at 5250rpm, something is amiss with this graph.
Rob
Click to expand...

Why are they supposed to? Looks like they cross @ about 6k, which may tie in with the increased rev limit? Surely every aftermarket map is different?

Mike
 
Ducklakeview said:
Smartbear said:
Ducklakeview said:
Looks like hard evidence to me!

Mike
Click to expand...

The bhp & torque curves are supposed to intersect at 5250rpm, something is amiss with this graph.
Rob
Click to expand...

Why are they supposed to? Looks like they cross @ about 6k, which may tie in with the increased rev limit? Surely every aftermarket map is different?

Mike
Click to expand...

It doesn’t matter how much power your car makes, the lines should cross at 5250rpm as the calculation for bhp is torque times revs.
Rob
 
Smartbear said:
Ducklakeview said:
Smartbear said:
The bhp & torque curves are supposed to intersect at 5250rpm, something is amiss with this graph.
Rob
Click to expand...

Why are they supposed to? Looks like they cross @ about 6k, which may tie in with the increased rev limit? Surely every aftermarket map is different?

Mike
Click to expand...

It doesn’t matter how much power your car makes, the lines should cross at 5250rpm as the calculation for bhp is torque times revs.
Rob
Click to expand...

Most wheel dyno programs "scale" the horsepower and torque curves to fit them neatly on the same graph...

And if we are being pedantic, the figure is 5,252

Mike
 
I can't read the language but it looks like wheel horsepower is 184 which has then then been translated to 255 at the crank which assumes a ridiculous amount of losses. Assuming 15% losses it would actually be more like 215 which seems about right...

NB: Dynos read wheel horsepower so crank figures are always going to be guestimates. I wish everybody just quoted wheel as it's far more relevant.
 
Steve84N said:
I can't read the language but it looks like wheel horsepower is 184 which has then then been translated to 255 at the crank which assumes a ridiculous amount of losses. Assuming 15% losses it would actually be more like 215 which seems about right...

NB: Dynos read wheel horsepower so crank figures are always going to be guestimates. I wish everybody just quoted wheel as it's far more relevant.
Click to expand...

Dynos actually read torque, not horsepower... The latter is calculated from the torque and rpm figures.

Mike
 
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