Someone Let Me Know About This Dyno Graph
05-09-2011, 01:07 AM
#11
1st Gear Member
Join Date: May 2010
Location: Wisconsin, Colorado
Posts: 95
i wonder if there isn't any timing added at WOT, because with the meth kit and 10# on a built 306, those numbers don't add up.. i'm not an expert by any means, but i really feel like there should be more..?
05-09-2011, 01:15 AM
#12
on a blower +meth with alum heads he should be getting kinda close to block destruction territory...
i think youre maxing out your fuel system and prolly pulling a BUNCH of timing
05-09-2011, 03:53 PM
#17
3rd Gear Member
Join Date: Aug 2006
Location:
Posts: 822
The FMU and 30lb injectors are not that ideal.
I would get rid of the FMU and get 42lb injectors. With 42s and the Meth you should be able to keep that AFR in the low to mid 11s where you want it. The red run shows an AFR of 12-which is way to lean in my opinion for a blown 5.0.
I like my tune in the high 10s low 11s at WOT....much safer that way.
Powerdynes are not the best blowers for making power. I used to run one until it blew up on me..now I run a Vortech. When I was running 10psi with my Vortech I was making about 100 more rear wheel horse than that dyno sheet shows and our motors are similar. Also with 4.10 gears the rear wheel horse will show less than 3.55s or 3.73s.
Nice Fox though...Good luck with it.
I would get rid of the FMU and get 42lb injectors. With 42s and the Meth you should be able to keep that AFR in the low to mid 11s where you want it. The red run shows an AFR of 12-which is way to lean in my opinion for a blown 5.0.
I like my tune in the high 10s low 11s at WOT....much safer that way.
Powerdynes are not the best blowers for making power. I used to run one until it blew up on me..now I run a Vortech. When I was running 10psi with my Vortech I was making about 100 more rear wheel horse than that dyno sheet shows and our motors are similar. Also with 4.10 gears the rear wheel horse will show less than 3.55s or 3.73s.
Nice Fox though...Good luck with it.
Last edited by only90s; 05-09-2011 at 03:56 PM.
05-09-2011, 03:58 PM
#18
3rd Gear Member
Join Date: Aug 2006
Location:
Posts: 822
After taking another look I think the 10.1 run is just a screw up/mistake on the wideband 02 sensor that was reading the AFR. I could be wrong, but I dont see how the power would be so close with a 2 point difference in AFR.
05-10-2011, 11:35 AM
#20
3rd Gear Member
Join Date: Aug 2006
Location:
Posts: 822
The second pic you posted shows a FMU-Fuel Management Unit(right above the power pipe)-that artificially boosts the fuel pressure and makes the injectors act bigger than they are. Most tuners do not like FMUs-if the FMU fails the engine is done!! Do guys run FMUs and are fine...yes but You are much better off removing the FMU and going with 42s or even 60s if you want to be safe. I run an Aeromotive Fuel Press Reg that increases 1psi per lb of boost, but that is different than an FMU.
Re..AFR Meth or no Meth 12:1 is right on the brink of being to lean in my book for a boosted 5.0. I have run Meth for 4 years now and I never heard you can run the AFR leaner on Meth. The Meth injection just riches the AFR so you can run more timing. I run my AFR in the high 10s and low 11s-much safer that way. If you want that motor to last I would like to see an AFR no more than 11.5.
I would recommend talking to some local Mustang guys and find out who is a great tuner in the area. Bring your Fox to him and let him take a look at it. Better to be safe than lose the motor IMO.