profit_child

So for Starters let me share my setup and go from there.

100k mile F20c 100% stock besides EGR delete and thermostat removed (I live in Florida and boosted)

HKS GT supercharger kit 15 psi pulley

Js racing 70rr titanium

Berk header

deatchwerks 800cc Injectors

Deatchwerks 265LPH pump

Radium fuel rail/ F-p Gauge/ AEM FPR

411 Whp on 93 octane/





My question is 15 psi is boarder line safe for a stock f20c on 93. I do understand supercharged PSI needs much higher rpm to achieve and is a little safer then turbo setups. Tuner is very confident That the tune should run well and is conservative. (i feel very rich 10.7 AFR at full throttle. and 91% of injector efficiency being used. He said for a Buffer you can always pick up c-100 up to c16 to mix with 93. If I were planning on racing it. Also mentioned we can do another race gas tune using 100% of one of the vp racing fuels that fit my application..


I plan on Having a track day here this year and was planning on picking up 100 octane or higher octane fuel from VP. maybe 8 Gallons of 93 and 3 gallons of c16 mixed for the weekend. for the added buffer similar to meth?

s2000Junky

10.7 is ridiculously rich. There is no need to run a 10.7 afr with your set up, aim for mid 11's at the top end of the rpm band should be plenty safe, with enough headroom to use proper timing without fear of detonation. Run in the mid 12's under 6k rpm where your boost will be little more then 6-8psi. Your car/throttle is going to feel like its pushing soup at 10.7 everywhere, otherwise. At the track with race fuel on this same tune, your afr is just going to be even richer due to the high oct fuel and higher IAT of the environment. Leaning out to more efficient fuel levels will also knock your injector duty down to more nominal levels as well.

DaGou

I am not loving the 91% injector duty number.

Personally I do not like depending on the mixed fuel for a tune on my car. I know you said it was only a buffer for track days but it a really an issue everytime you are at full boost/high RPM.

Either your tune is good for 93 octane or it is not.

Playing with gas mixtures is not something you want to do.

profit_child

Thanks for clearing that up I felt it was rich as well... But I am not a professional tuner... The wideband is wired into my AEM EMS V2 and I think that is a factor the weather is florida is so moody... I have seen my AFR's at high rpm (8000-9000rpms) from 10.6 to 11.4 And I think its trying to correct... I really need to get the car up to temp and do a few good pulls and a good long drive to get an average reading. This setup has only seen about 400 miles.

He also said I didn't gain anymore power leaning it out... I'm also noticing that at idling at 13.6-13.2 I feel this tune is very rich.

Cruising around town its pretty Stoich.

profit_child

The tune was said to be conservative and safe for 93 octane. He mentioned for an extra buffer on track day. I can run 100 octane or mix c16 with 75% 93 to add a "buffer/Safety net" <- his words when planned for heavy Stress on such high boost...

profit_child

Thanks for the replies in advance will set up a go pro and do a few runs over the week to get an average reading...

Going to swing by kings and have him double check my tune.

Steven622

If you need a buffer for track days add a gallon of xylene or toluene or two to a full tank of gas. It's 118 and 121 octane respectively.

gfresh86

Think you might need a new tuner. My idle has rarely ever changes winter or summer. And for your air fuel to adjust between 10.6-11.4 is alot. Mine is only fluctuating .2 at most.

profit_child

Going to swing by there Friday and see what he does.

gfresh86

Yeah i wouldnt abuse the car until you get it sorted out. Im at 16psi making 460whp on a kraftwerks kit so your setup should be plenty reliable.