Just got reflashed and here are my results. Judging from several other trucks with similar modifications, I feel my power may be down as much as 40 to 50 horsepower. Peak boost is 15.5 pounds. My tuner mentioned the MAF limits were being exceeded. He recommended a larger Mass air meter and larger injectors. I welcome all comments! My mods are in my signature.

 

You dont say how much boost you are running but a 13 a/f is high my tastes....
You dont drop much below 13 till 3500 rpms.... and thenm it stays around 12.3 or so ... With your HP numbers and Im assuming some decent boost I would go richer just to be safe
Doug

 

Looks about right. You shouldn't be hitting MAF limits, but maybe...

Coldie

 

i agree. but i dont recommend going with a bigger maf until someone comes out with one that doesnt act funny. tuners are able to work around pegged mafs. right now you taxing your injectors. 42 can support 450-500ish id bump up to 55s and some 255pumps

 

Doug,

Peak boost is 15.5 pounds. Tuner states the A/F will actually richen when vehicle is not on the dyno. Don't know exactly why.

 

Gary,

My understanding is that the truck will actually run richer on a Dynojet than it will on the road. I was under the impression that once the truck was under load, which it isn't on the Dynojet roller, it would actually run leaner. I may be wrong but that's what I've been told...

 

Gary I was told the same - That the trucks run leaner on the street than the dyno

Doug

 

looks lean and also down on power in the lower RPM range. I would suggest getting some 255 fuel pumps to replace the stockers.

 

when they read the A/F ratio's did they put a sensor in one of the 02 bungs, or just stick a probe in the exhaust tips??

If they just stuck a probe in the tip, those read leaner than if you put a sensor in a 02 bung.

 

My dyno is similar except I flatten out in the 12.1 a/f range for the higher RPM's.

I am curious, what did the tuner say about the dip between 3000 and 3200? It is so evident in both Hp an torque.

D-Day

 

Gary,

I talked with Tim about your truck extensively.The Maf Pegged and went into the failed MAF curve(taxing the injectors).They were very conservative with timing per your request..He said total timing advance is set @ 14 degress.
The dip is from easing into it on the dyno.Gary's truck would try to kick down into 2nd if it was romped.

The A/F is fine.The truck will be Richer on the road and 12:1 is fine on a dynojet especially thru cats.He see's atleast a .50 drop in A/F on the street on every car that is tested with a wide band.
Alittle more timing and fuel and the truck will easily see 500rwhp.
Its a computer Reflash set with adapitive curves.Nochip..
Gary's truck will actually add fuel if the rear 02's sence to much exhaust temp.Gary can attest to this after a few high speed passes.
Tim tunes 3-4 cars a week with the adaptive tune strategies.Making an after market MAFwork is easy.Alot more adjustability a with a reflash over a chip.He can get into tables a chip cannot..

When ever your ready to get more aggressive he is ready.He wants to see 500rwhp with your setup still being conservative.
He kept everything very conservative per your request.

FWIW,had an 03 cobra bone stock gain 48rwhp and 74TQ with a aggresive tune after your truck was done..

Let Tim work his magic when your ready to see what this thing will really do.

Jeff

 

Jeff,

You are the first to say that I've seen that the truck will get richer on the road.

Any guys with wideband meters, can you let us know what your experience is with a/f ratio comparing dyno and on-road driving?

Thanks

 

This is Tim,

It will be richer with the adapitve strategies I use on the reflash.The load on a dyno is less then on the street.Gary' truck is set to richen up a certain percent based on load and exhaust temps.I'll gladly put a wide ban in the truck to prove it.
We always see atleast a .05 drop in A/F on the street verses the dyno using a reflash.
If Gary beats on his truck repeatedly and exhaust temps get to high,it will dump alot of fuel in to keep it safe.He can attest to this.It did it to him after a few high speed blast.I do alot of this,and we test alot on the street after a dyno..We always have the same results.

Dont take my word for it ..Call and talk to Mike Morella @ Steeda.They also do alot of reflashing and see the exact same results.They will set a supercharged GT @ 12.5 on the dyno so its in the 11's on the street.We have worked with them extensively on reflash technology to optimize results.
FWIW,there are over 500 supercharged GT's currently using this technology and no motors have ever been lost.


Tim

 

Gary,

I looked at your mods more closely. You and I are very similar, with the exception of - you have the electric fans, I don't and I am running a 9.25 or 6lb on the bottom - at least those are the major differences.

I am also tuned in with 14 degrees - that conservative line that I want, as you do.

Believe it or not, my tuner told me to reduce boost or buy the bigger injectors, because I am maxing the stock injectors with the KB and 16lbs, if I want to see 500+.

Do you know how much hp your electric fans gained?

You know when it is all said and done, it's nice for the ego to have big numbers, but I rely on the "seat of pants" thrill. Where I am right now, at least for now, is perfect for me. I love it!!

Good Luck

D-Day



Thanks for explaining the dip, Jeff!

 

Are you running your mods on the stock block?