Just got back from the dyno... Stock - Diablo 93oct tune - Custom tune - Page 3 - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #21 of 106 (permalink) Old 11-09-2012, 05:41 PM
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So roughly from 470hp/470tq to 505hp/490tq with the custom tune. Not bad.


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Last edited by rayzazoo; 11-09-2012 at 05:44 PM.
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post #22 of 106 (permalink) Old 11-09-2012, 05:45 PM Thread Starter
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lol! Good one

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

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post #23 of 106 (permalink) Old 11-09-2012, 05:47 PM Thread Starter
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Somewhere there abouts.

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Originally Posted by rayzazoo View Post
So roughly from 470hp/470tq to 505hp/490tq with the custom tune. Not bad.


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post #24 of 106 (permalink) Old 11-09-2012, 07:39 PM
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So roughly from 470hp/470tq to 505hp/490tq with the custom tune. Not bad.


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nope.

470/470 to 487/500

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post #25 of 106 (permalink) Old 11-09-2012, 08:03 PM Thread Starter
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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?
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post #26 of 106 (permalink) Old 11-10-2012, 07:30 AM
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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
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post #27 of 106 (permalink) Old 11-10-2012, 08:09 AM
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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%

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post #28 of 106 (permalink) Old 11-10-2012, 08:18 AM
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^^^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.

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post #29 of 106 (permalink) Old 11-10-2012, 08:33 AM Thread Starter
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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?
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post #30 of 106 (permalink) Old 11-10-2012, 09:05 AM
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Quote:
Originally Posted by rander View Post
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!

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1/4 mile PB 12.346@109.42

Last edited by chris1992; 11-10-2012 at 09:06 AM.
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