Determining standard G/S from BHP

[rsmith]

Hi All,

Seen plenty of posts here on does my g/s look ok? is my MAF fooked.
Came across this calculation on another site and it is pretty accurate.

To determine what your G/S should be do the below, my car is an LCR 210hp stock and i got 168g/s which was bang on what my VAG logs were saying.


bhp x .8 = expected air mass in g/s


Anyway haven't seen this posted before, so there ya go.



Cheers

Rob

 

[Beaker™]

Hmm, interesting. According to that calculation i should be seeing 174.4g/s. I can't get above 140g/s though. Either my MAF is screwed or you were lucky with your calculation.

Also, a mate of mine (250bhp) should be getting 200g/s according to that but i think the most hes ever seen is 175g/s.

Anyone else getting accurate results?

 

[m0rk]

Beaker, either your MAF's screwed, or you've got something else to look at... You should be seeing mid to high 150's

MAF based calc's are a grey area, as with a little tweak you can get them to say what you want.

But 0.8 is a bit high, most people would go a little lower @ 0.76

 

[Beaker™]

Cheers. That sucks. lol.

 

[rsmith]

definitely, i wonder is there an experienced Vag people out there that can confirm, i know my reading was accurate to 1g/s of what i was reading for loggin.


cheers

Rob

 

[rsmith]

Sorry m0rk, you answered my question just as i posted, anyway .76 or .8, its still its a good starting point.


I got it from the Ross tech site, its on the last paragraph.

http://www.ross-tech.com/vag-com/cars/fuel-trim.html

 

[Big_daddy]

i get 168g/s out of my app engine that equals to 221bhp. Is this right?

 

[Beaker™]

Do the math....

211bhp x .76 = 167.96g/s

What power is your engine? What mods etc?

 

[Big_daddy]

Do the math....

211bhp x .76 = 167.96g/s

What power is your engine? What mods etc?

My pc calculator must be broken

Leon - app engine with ko3s turbo, stage 1 remap, rear exhaust. KN typhoon filter, forge dv. earthing kit. thats about it i think

 

[longman]

I agree that this is a bit of a grey area. Its the same with the Block 120 logs for BHP.

It will work for a standard car but it doesn't take timing into account and there is a fair bit of power to be had from timing tweaks, when remapping.

This might not work on a remapped engine.

 

[Big_daddy]

Yeh im getting timming between 3.8 to 6.8 which seem to be high

 

[longman]

Hmm, any more than a CF of 3 is a bit much, especially if its for a prolonged time.

It just means the ECU is cutting the power to stop early detination. Hi temps will cause this too.