Some fun at Dynomotive

[Joe Malms]

not my car..but a good friend of mine...not to shabby at all huh?:)
FYI, the place the car was dyno'd at gives the best rates in town by far!!!
Wideband 02 as well (this car in particular was at a healthy nearly FLAT 11.3 - 11.4 a/f ratio under boost) . Its a mustang dyno.
its rwhp and yes its an Import
:D
heres the website for dynomotive:
www.dynomotive.ca

[Ekliptix]

is it aaaaaaaaaaa Supra TT?

[Ben]

yeah, looks like Maus numbers...

[choweyt3t4]

holy crap!id need 4 motors of mine to even come close to those kinda numbers i hate to mess with whatever it is on the streets yikes!

[rage2]

Originally posted by Joe Malms
Wideband 02 as well (this car in particular was at a healthy nearly FLAT 11.3 - 11.4 a/f ratio under boost)

Healthy AFR, yes. Most powerful AFR, no. Aim for a 12.5 AFR... you'd be surprised how much difference in torque it makes compared to 11.3-11.4. My 944 was dialed in at 10.5 AFR before I got my wideband O2, after knocking it back to 11.5 AFR, torque jumped by 6%. Car will be dialed in with less ignition advance and 12.5 AFR this weekend. See the following chart, shows AFR vs Cylinder Pressure during combustion.

[nosoup4u]

12.5 is to lean for me. My wallet is not big enough to run that air/fuel

[rage2]

Originally posted by nosoup4u
12.5 is to lean for me. My wallet is not big enough to run that air/fuel

That's what I thought too, but after speaking to a few tuners regarding AFR, ignition advance, fuel quality, based on their testing and tuning over the years, 12.5 is the AFR that should be aimed for. If you're knocking at 12.5, it means either your timing is too aggressive, or boost is too high, for the fuel that you're running. 12.5 AFR will always get you the most power, lowest EGT, highest efficiency regardless of fuel, and assuming your boost and timing is set to the limits of the fuel you're using.

That's the problem I'm dealing with on my car, I could only run a 10.5AFR or the car would knock. Turns out my ignition timing was way too agressive, by about 7 degrees, for 91 octane pump fuel. Turning back timing, dialing the AFR to 12.5, car runs noticably crisper and faster now without knock.

[choweyt3t4]

dont mess with rage he knows his shit!

[GP_DrIvEr]

they do a pretty cheap dyno test... at davenport it is 50 or 75 for the first run and 25 for every other after that

this place is like half the price

[HOK]

mmm reg even recommends 11.5 especially if your pushing that high of hp...

but whats your egts? no soup...

[rage2]

Well 11.5 will give you that extra bit of safety margin if you're tuning on marginal quality fuel. I mean, on my car, different "91 octane" fuel from different gas stations will perform differently and give light knock at 12.5... going to 11.5 will "cover up" the crappy fuel but give a bit less HP (fuel's a cooling agent, so unburnt fuel will lower combustion temps). That's why I turned boost down from 14psi to 12psi. At 12psi 12.5AFR it makes the same power as 14psi at 11AFR, without fouling plugs, and give me enough safety margin on 91 octane.

On 104 octane, I run 20psi, 12.5 AFR, with lots of room for safety... nowhere near fuel knocking limits.

Different tuners swear by different AFR's to aim for, but research has shown 12.5AFR gives the most power.

[HOK]

well i would never run 12.5 on a daily driver... my car has way rich a/fs.... Egts are really low... i've never tried 104 oct in the car... but its enough in my car...

don't know about no soup... awesome numbers, thats way too much hp... i'm gonna report you to the roll cage police... hehe

[rage2]

Originally posted by HOK
well i would never run 12.5 on a daily driver... my car has way rich a/fs.... Egts are really low...

It all depends on how close you're running to the limits of the fuel. I mean, if you run 1psi boost, you're nowhere near the octane limits of pump gas, hell you can run 13 AFR and you'll still be fine. But if your engine is tweaked to the point where different gas from different stations will exhibit minor knock, then 12.5 AFR would not be such a good idea if you stumble on a bad batch of gas somewhere...

[HOK]

well i was talking over 10 psi cars... cause especially with our weather... too much changes...