Edelbrock Tune
 

Hello all, I recently got a Edelbrock supercharger installed on my car and got the car remote tuned by a tuner. The car has catless header, oil/radiator cooler, and is running on E85. I went to dyno the car today and was told that the car is running strong but too lean past 4k rpm. Just want another opinion since I have no knowledge in the tuning cars. Here are the graphs:
https://farm2.staticflickr.com/1970/...16c5ebd1_o.jpg
https://farm2.staticflickr.com/1930/...4f198d97_o.jpg

Ok if that AFR graph is accurate then its running 13.5-14 afr over 4000.

Even on E85 thats way lean for boosted (even lean for NA) you would want to be arround 12 over 5000 boosted on E85 under full throttle

Id get it looked at

Well, what did the tuner say?

It's Sunday so probably won't get a response back until tomorrow. Prior the dyno, I logged my car twice and the tuner provided revision map for each time, and in the second time I saw the knock correction factor at -1 and -2.1 during WOT so I asked and he said a little bit of knock is normal, thoughts on this?

It's knock prone as it's running hot (lean). Likely inconsistencies between the OEM O2 sensor output and the dyno WBO2 that the tuner doesn't think it's that lean.

Do you have bigger injectors? Stock injectors aren't large enough for boosted and E85.

You have to run a log, target vs actual F/A ratio to ck if your MAF sensor/speed density scaling is correct.

You have to log DI fuel, PI fuel, pump duty, total fuel ect and make sure the pump or injectors aren't maxed out. The stock system is good for around 240-250 HP

So select most of the fuel options log a 3rd gear pull and send it to your tuner. You can plot the curves and should be easy to find the problem, either scaling or not enough fuel...

The tuner who dyno my car told me it doesn't seem to be a fuel supply issue based on the shape of the A/F graph, something like it drops a bit right before 4000rpm then jumped back up :iono:
And the tuner who tuned my car told me before that the Edelbrock sensor (MAF?) doesn't work very well at high RPM and suggested me to get a Dbox from Delicious Tuning. And he found it odd that the A/F data from the log is off by 2 points of the data from the dyno, and he asked if I have cats on the car. Does he mean the cats are restricting air flow and causing problems?
Will see if the tuner ask for specific data later.

stock fuel system can do much more than that.. but on petrol only, E85 would definitely rrquires upgrades of course

i tuned a hks v2 with 44mm restrictor with totally stock fuel system, and he probably puts 315v or more at the crank

2 points, as in 0.2? If so, that's pretty normal (and actually quite good). The stock O2 is closer to the engine and then any cats as well as more oxygen present at the tailpipe should always read leaner. If the 2 correlate well then that's good, but not really good that they left the tune like that if the O2 scale is well representing the output.

2.0 not 0.2 lol

Spent a little bit time to look at the last log I sent to my tuner, during the few pulls the A/F ratio stayed around 12 consistently. That was logged with ECUtek, is that reading accurate? If yes, how come it differ so much from the dyno reading?

No. The sensor output can be adjusted in the tune. But you have diagnosed the issue, the tuner thinks it looks OK while the AFR is well out. I would be using the dyno WBO2 as a much better point of reference.

The tuner is very confident that the reading from the dyno is incorrect and suggest me to get wideband A/F sensor if I want to be safe. What is the difference between a wideband A/F sensor gauge and a OBD II type A/F gauge? I was thinking about getting the P3 gauge but not sure if it's worth since my BRZ already has the oil temp already.

Well a WBO2 installed would certainly help. An OBD based gauge will read the same as the logs as it's just using the OEM sensor and scale that's in the tune. TBH if the dyno operator is confident in the reading then I'd not doubt it. I would expect a couple of of tenths difference, not 2 points. You could always ask the dyno operator when his WBO2 was last calibrated.....