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-   -   How Accurate is Cobb AP's Dyno Feature? (http://legacygt.com/forums/showthread.php?t=133074)

nightspeed98 03-13-2010 11:38 PM

How Accurate is Cobb AP's Dyno Feature?
 
I entered the curb weight plus my own weight and this is what i got
258.70 WHP @ 4700rpm,
319.60 torque @ 3894rpms
60' @ 2.27 sec
330' @ 6.14 sec
0-60 @ 5.748 sec
1/8 @ 9.354 sec @ 78.932mph
1000' @ 12.11 sec
1/4 14.639 sec @ 88.25mph



how accurate are these numbers????
temp was at about mid to upper 30's at 5 am

Darkness of Death 03-13-2010 11:44 PM

couldn't tell you. but i wouldn't think it would be accurate.

on stage 2, the accessport said i was doing over 730whp and over 1100ft-lbs of torque.

never did quarter mile time = just dont have a place to do it at - without going to a race track

bace 03-14-2010 03:13 AM

my stage 2 only got 540whp and 630lbs... :(

nightspeed98 03-14-2010 09:41 AM

my numbers sound more realistic, i am just trying to check accuracy.

m sprank 03-15-2010 04:58 PM

Those numbers are not realistic.

You have more torque than my 68HTA on 91 gas.

A typical stage 2 car is 250hp/270tq.

Pull a log and use the airboy spreadsheet.

nightspeed98 03-16-2010 07:32 PM

airboy?

m sprank 03-16-2010 07:41 PM

yes. it is a free spreadsheet that interpolates the data from your log. you can use it to calculate all kinds of cool things, including a dyno graph. it is just as accurate as a dyno as long as you put in the proper numbers for your car. HP is just a mathmatical equation based on torque. torque can be found using rpm, load, weight, wheel circumference, gear ratio, atmospheric conditions, elevation.

it is available on romraider. downloads as a zip file. just open it, instructions are page 1. need your logs saved in xml format. ap does this for you.

have fun.

nightspeed98 03-17-2010 05:57 AM

hmmm

bnguyenbb6 03-21-2010 12:10 PM

Quote:

Originally Posted by m sprank (Post 2869457)
You have more torque than my 68HTA on 91 gas.

He also has colder IAT's. A Stage 2 + FMIC here in Texas put down 260/311 on a Mustang dyno. His(the OP) numbers might be a little high but not too far off. Colder IAT's make a huge difference. The 1/4 mile trap is WAY off though. I was still trapping 96ish in 95* weather when I was Stage 2 with a stock TMIC, having to wait 20 mins in the lanes between runs.

OP- The AP's dyno is as accurate as you want it to be. If you throw something on and the AP shows you gained power, you probably did. Now how much...who really knows. But its sufficient if you are looking to compare against yourself, same location for the pulls. The only way to accurately compare numbers across the nation is to put the car on a Dynojet dyno as they are the only ones that read the same cross country.

Numbers are just numbers, trap times(real trap times) and dynojet numbers are the only way to really compare how fast a car really is and even then, a dyno is just a tool. Don't get caught up the whole "my car made X WHP and X WTQ", there are WAY too many variables.

If you were REALLY serious about comparing your car to others, head to your local tuner, throw it on his dyno and then compare to what other cars that have been on that same dyno made.

m sprank 03-21-2010 12:43 PM

I know about the IAT. I moved from NYC to CA just 8 months ago. I have LOTS of cod temp logs on 93 (from NJ) in my 5EAT at stage 2.5. His numbers are not realistic. I too used my AP and got ridiculous numbers. His numbers are close, but something is wrong.

I agree the best thing to do is forget about the numbers. Head to the track (Englishtown?) and get a time slip. Who cares what a dyno says. How fast does it really go?

nightspeed98 03-23-2010 04:21 AM

I actually live less than 10 miles from Raceway park (or englishtown, whatever you wanna call it.)

usedpc4u 03-23-2010 09:02 AM

Turbos
 
Quote:

Originally Posted by nightspeed98 (Post 2871606)
hmmm

Does any one know a difference between 2006 LGT stock turbo & intercooler and 2006 WRX STI stock turbo & intercooler?
IS it worth upgrading?

GTTuner 03-25-2010 07:06 AM

My G-timer is more accurate than that! I set it up to measure flywheel HP. Stock it measured 248bhp, 251ft.lb.

I use it mainly to measure if what I am doing is improving or hurting power levels.

m sprank 03-25-2010 08:27 AM

Turbo is a VF-39 (?) This is an "upgrade" from the LGT's VF-40/46. But the TMIC route is a joke. It would require the entire STi manifold (which gives no gains). If installing a VF-39 go FMIC.

bnguyenbb6 03-26-2010 03:13 PM

Quote:

Originally Posted by m sprank (Post 2882793)
If installing a VF-39 go FMIC.

+1(its what I have)

But as always, the more power you have the hungrier you get. I sorta want an FP Green or TS 30R now :lol:


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