got back from a tune can these numbers be right

[bob123131]

Just got my car tuned after a full rebuild and i run an safc2, walbro 255, denso 560cc, and an evo 3 at 16/17 psi. We stopped tunning after an hour because my coil pack started going bad, i know bad timing. Anywase he told me bring it back it will ###### only take another 30 min im just a little rich across the board and he wanted ot back in down. So im hope looking at my settings he has me -20 percent across the entire high thr. How is that possibly close to being right my injectors are barely 20 percent bigger than stock plus more boost, cams, etc. I dont see how i can be runing less than stock fuel on all that plus he said im still rich. Also my last tune the least fuel i had was -17. I'm i wrong and is this possible or is this shop have no idea what they are doin? I made 280 whp before i left so its not like a big boost leak or anything?

 

[nfernotalon]

Is there another shop you can go to for the next tune?

 

[1992awdlaser]

Those injectors are about 19% bigger than stock. The stock fuel curve goes into the 9's for the air/fuel ratio. Even leaning one of these cars out some they will still be rich because of how rich they run from the factory.

 

[kahl23]

Post a log, it will say more than you can about whats going on in your engine.

 

[bob123131]

i dont have a log and i never got one printed from then so i cant really, but here are exactly what i have im 27 percent rich at low throttle point 1k then slowing decreasing till im finally -2 percent at 7.6k in low throttle. High throttle im -20 percent form 1k to 5k and then -25 from 5k to7.6k. I would just like someone to answer if i should go get my 200 back you know, or at least not go back there? Why would i need an additional 27 percent at idle you know?

 

[JayRolla]

No if you had it tuned on a dyno with a wbo2 I'm pretty sure they where doing it right. You need to post a log with timing so we can see if you getting some knock. Remember like mentioned above the stock afr is mid 9 afr's. Most tuners shoot for 10.9:1-11.1:1 afr which is a lot leaner than stock.

Then when you add boost the fuel pressure rises with the extra boost. This adds a lot of fuel when at wot and will surprise you how much fuel you have to take out to get a good afr.

 

[bastard dsm]

your #'s sound about right for your mods a boost.