Just got back from the dyno... Stock - Diablo 93oct tune - Custom tune

[rayzazoo]

So roughly from 470hp/470tq to 505hp/490tq with the custom tune. Not bad.


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[rander]

lol! Good one

Originally Posted by CruzKing

rander that looks good, now you can give those pesty 09/10 auto RTs a run for their money.

[rander]

Somewhere there abouts.

Originally Posted by rayzazoo

So roughly from 470hp/470tq to 505hp/490tq with the custom tune. Not bad.


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[Litos]

Originally Posted by rayzazoo

So roughly from 470hp/470tq to 505hp/490tq with the custom tune. Not bad.


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nope.

470/470 to 487/500

[rander]

I think it's more like this at the crank adding 20% parastic loss:

stock:
377 * 1.25 = 471.25 HP

385 * 1.25 = 481.25 TQ

Custom:

394 * 1.25 = 492.5 HP

415 * 1.25 = 518.75 TQ

Crap can't remember how it goes. Can someone confirm this?

[Litos]

Originally Posted by rander

I think it's more like this at the crank adding 20% parastic loss:

394 * 1.25 = 492.5 HP

415 * 1.25 = 518.75 TQ

uummmm, in my opinion 20% might be a hair too much.

would be safer to go with 17-18% - ask Brian what he thinks.

i'm no pinball wizard but based on an 18% loss, the numbers are below

crank hp = 481

crank tq = 507

[Toxic11]

Originally Posted by Litos

uummmm, in my opinion 20% might be a hair too much.

would be safer to go with 17-18% - ask Brian what he thinks.

i'm no pinball wizard but based on an 18% loss, the numbers are below

crank hp = 481

crank tq = 507

17-18% is way high for a modern automatic, more like 13-15%

[EricG]

^^^Agreed. These Mercedes autos are very efficient. Plus the drivetrain can only soak up so much power, after you take ~13% of the first 400, I bet you get to keep most of the rest for the # at the wheels.

[rander]

we know the 6.4 does 470/470 on an engine dyno. And yes the nag1 is efficient like said, but I added the transmission parasitic loss plus the parasitic loss from the load of a mustang dyno. If we use the numbers from the stock tune to get to the 470 number at the crank comes out to roughly 20% loss all around. Wouldn't that make sense?

[chris1992]

Originally Posted by rander

I think it's more like this at the crank adding 20% parastic loss:

stock:
377 * 1.25 = 471.25 HP

385 * 1.25 = 481.25 TQ

Custom:

394 * 1.25 = 492.5 HP

415 * 1.25 = 518.75 TQ

Crap can't remember how it goes. Can someone confirm this?

A better way would be:

(470-377)/470 = 19.79% loss

So there for:
stock HP: 377/(1-.1979)= 470.0
stock TQ: 485/(1-.1979)= 480.0

CMR HP: 394/(1-.1979)= 491.2
CMR TQ: 415/(1-.1979)= 517.4

BTW- Congrats on the HP/TQ bump! Can't wait to see what the 392s can put down at the track with custom and canned tunes!