Dyno numbers - stock vs stillen airbox, stock vs mrev
Trey-
As usual, great analysis and thanks for the taking the money and time to do this. While I don't think everyone will see a 6whp/wtq drop adding the Stillen CAI, I think it's just more dyno proof that intakes don't do squat for these cars and also seems to kill the notion that tuning can take advantage of making power with aftermarket intakes.
As usual, great analysis and thanks for the taking the money and time to do this. While I don't think everyone will see a 6whp/wtq drop adding the Stillen CAI, I think it's just more dyno proof that intakes don't do squat for these cars and also seems to kill the notion that tuning can take advantage of making power with aftermarket intakes.
Hey trey! Could you possibly send me the before and after dyno run files? Like the two last runs you posted up? Run 5 and Run 3? Did you get a file copy of those? Or are these just print outs the place gave you?
Joined: Apr 2005
Posts: 3,521
Likes: 2
From: Birmingham AL
When I finished up the post, I knew there was one more comparison that I was forgetting. I just remembered: stock plenum with stock airbox versus mrev+ plenum with stock airbox. Sure, I already covered that one, but my basis was the tuned versus untuned.
So here is a chart that shows the dyno from a week ago, with the stock airbox and mrev+, compared to last week, with the stock airbox and stock plenum. Both untuned, so to speak. The blue curve is the stock plenum, the red curve is the mrev+.
First, it's interesting to note that the stock collector is running richer after 4400rpms. Second, you can see that after 3200, the mrev+ is definitely making more torque, until the two lines cross at ~5300. From there, it's all the stock collector.
Up top, the difference is much larger. At 6500rpms, the difference is 14.5hp in favor of the stock collector. At 6900, it's almost 22hp. When the numbers are crunched for the "drag strip rev range", the stock collector beats out the mrev+ to the tune of 3.22hp/1.01tq. Not huge by any means.
Now the new configuration(stock collector) does not fare as well when compared to my baseline a year ago(mrev+). But like I've mentioned, my tune is effectively gone right now.
So here is a chart that shows the dyno from a week ago, with the stock airbox and mrev+, compared to last week, with the stock airbox and stock plenum. Both untuned, so to speak. The blue curve is the stock plenum, the red curve is the mrev+.
First, it's interesting to note that the stock collector is running richer after 4400rpms. Second, you can see that after 3200, the mrev+ is definitely making more torque, until the two lines cross at ~5300. From there, it's all the stock collector.
Up top, the difference is much larger. At 6500rpms, the difference is 14.5hp in favor of the stock collector. At 6900, it's almost 22hp. When the numbers are crunched for the "drag strip rev range", the stock collector beats out the mrev+ to the tune of 3.22hp/1.01tq. Not huge by any means.
Now the new configuration(stock collector) does not fare as well when compared to my baseline a year ago(mrev+). But like I've mentioned, my tune is effectively gone right now.
Joined: Apr 2005
Posts: 3,521
Likes: 2
From: Birmingham AL
Originally Posted by BolivianFuego
Hey trey! Could you possibly send me the before and after dyno run files? Like the two last runs you posted up? Run 5 and Run 3? Did you get a file copy of those? Or are these just print outs the place gave you?
Registered User
Joined: Dec 2003
Posts: 2,514
Likes: 5
From: Marietta, Georgia
Factory engineers use ENDOLENE CLEAR as reference fuel to avoid weekly, daily, monthly changes in pump gasoline. Not unusal for pump fuel to vary +-5% in btu per gallon without ethanol, make that +-8% with E10.
Dramatic difference between winter [higher btu] and summer blend [starts May 1-15].
Dramatic difference between winter [higher btu] and summer blend [starts May 1-15].
Joined: Apr 2005
Posts: 3,521
Likes: 2
From: Birmingham AL
I'm sorry, but I'm afraid I don't get your post. That totally seems like a bot's post.
Are you suggesting that the discrepancies in my dynos can be explained via differences in fuel? If so, then that might be a part, but I can't speculate on how large of a factor that might be.
Are you suggesting that the discrepancies in my dynos can be explained via differences in fuel? If so, then that might be a part, but I can't speculate on how large of a factor that might be.
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Joined: Feb 2007
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lol i switched my mrev to stock 06 rev up collector today.
it took like an hour
we'll see trmw if it makes a difference
i am also going to put on a crank pulley also
i also put on my stock 06 box with a fresh k&n filter lol
it took like an hour
we'll see trmw if it makes a difference
i am also going to put on a crank pulley also
i also put on my stock 06 box with a fresh k&n filter lol
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Joined: Sep 2005
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I pointed this out on my350z a while ago, and just recenly others have caught on
Why spend so much money going backwards?
Check this for a nice comparison:
http://my350z.com/forum/na-builds/36...up-mrev-2.html
Why spend so much money going backwards?
Check this for a nice comparison:
http://my350z.com/forum/na-builds/36...up-mrev-2.html
Registered User
Joined: Dec 2003
Posts: 2,514
Likes: 5
From: Marietta, Georgia
Measure the btu per gallon of the fuel used as that will directly control BMEP [the amount of peak pressure on the piston] and that is torque.
Engineers use pressure sensors between spark plugs and heads to measure BMEP.
http://www.optrand.com/products.htm
The point is so many variables with any dyno impossible to accurately use it to compare tiny differences in products +-2% or +-6 HP or lb/ft.
Engineers use pressure sensors between spark plugs and heads to measure BMEP.
http://www.optrand.com/products.htm
The point is so many variables with any dyno impossible to accurately use it to compare tiny differences in products +-2% or +-6 HP or lb/ft.