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Dyno day!

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00dakotav8

· OMG 4.7L
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Discussion starter · #1 ·
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^not too exciting
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^Thats me next to that truck....I'm 6'3", sad part is he popped the headgaskets on the dyno, so his 468 put down less than the dak :headbang:
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^My good friends M3....amazing how that car makes more noise from the front end than the rear....variable valve timing is cool....heh
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^Badass z28 that put down some pretty healthy numbers prior to breaking the t56 on the dyno haha....

So for my dyno numbers....I dont have a pic of the graph...but I have it here with me....It did 219.8 rwhp at 4500 rpm and 276.2 at 3800 rpm....hardly any gains for maxes since the last time....but I did bring up my average by almost 20 horsepower....199.7 rwhp average, and 238.8 rwtq average....now to just order the stall so I can get that fat powerband faster....heh...
 
#2 ·
you get an a/f reading?
 
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#5 ·
got_torque said:
No videos??



It wont be accurate anyway if he has cats...
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thats been a question thats been lingering in my head that i meant to make a thread about a while back

so why do they do it if its not accurate?
 
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#6 ·
viperkota said:
thats been a question thats been lingering in my head that i meant to make a thread about a while back

so why do they do it if its not accurate?
Click to expand...

I say they do it because it lets people keep talking about their dyno numbers.

They need to get the a/f reading from before the cats, like all the data loggers do.
 
#7 ·
got_torque said:
I say they do it because it lets people keep talking about their dyno numbers.

They need to get the a/f reading from before the cats, like all the data loggers do.
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then i guess my cat is working pretty darn good then....so maybe i'm not running lean.....i have to try and make an access hole or something for their probe on the new exhaust
 
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#8 ·
got_torque said:
I say they do it because it lets people keep talking about their dyno numbers.

They need to get the a/f reading from before the cats, like all the data loggers do.
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For some reason I never thought of it like that. Fuck, I am buying a wideband right now.
 
#11 ·
00dakotav8 said:


So for my dyno numbers....I dont have a pic of the graph...but I have it here with me....It did 219.8 rwhp at 4500 rpm and 276.2 at 3800 rpm....hardly any gains for maxes since the last time....but I did bring up my average by almost 20 horsepower....199.7 rwhp average, and 238.8 rwtq average....now to just order the stall so I can get that fat powerband faster....heh...[/QUOTE]

Havent seen you out in awhile.. You still in Lincoln? What kinda numbers did Ryans M3 put down?
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Discussion starter · #13 ·
the e36 m3 is a 5spd and put down 222 rwhp and 220 rwtq. At red line the car was still making more power....so hopefully it'll put down a lot more when he gets the limiter pushed back to 7k and a little more timing advance.

I don't have cats. My afr's across the board were in the low 12s barely dipping into the high 11s when I was at max hp. I'll have a video of the whole day soon because my truck with straight pipes was one of the quieter ones there...heh

And for the guy putting down 260, great job, about time you took use of the 1.2 litres you have on my puny 4.7 haha.
 
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Discussion starter · #16 ·
haha that'd be cool, I think i'm getting a ride from my parents either tomorrow, thursday, or friday...I'm not sure, I'm not in a hurry to get it yet, because when it gets back its going to need a good day of cleaning and waxing before I let it go out again....The cabins out where all those storms happened last week....ergh....:rant:
 
#18 ·
got_torque said:
I say they do it because it lets people keep talking about their dyno numbers.

They need to get the a/f reading from before the cats, like all the data loggers do.
Click to expand...
Not necessarily true.

http://www.bristoldyno.com/tech/airfuel.htm

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Another important factor is that most air/fuel ratios are measured via a tailpipe sniffer. This method has proven to be an excellent way of measuring the ratio, but it is not perfect at low rpm. At low rpm, an engine may not be producing enough gas to displace all of the atmospheric air in the tailpipe, and this will produce a false lean reading because of the extra oxygen - as one can see in this chart. This phenomenon is going to be more pronounced in small-bore engines with large diameter exhaust piping. Two important things must be considered when one is tuning with a tailpipe sniffer because of this phenomenon. One, a flat line across the entire rpm band will mean that the actual air/fuel ratio is too rich at low rpm. Two, a real-world driver is almost never at wide-open-throttle at such a low rpm, so the air/fuel curve at that point is something that the driver will never see. One can also see from the chart that the catalytic converter has no significant effect on the air/fuel ratio in this particular vehicle.
 
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