trabots

Jerry, if you are reading this, when you tuned my car you refused to lean the AFRs up top to over 11.0. This car is tuned with AFRs in the 12.0+ range up top which is where you want it for max power in non blown motors. Why the difference in target AFRs in these tunes? Cheers.

sales@eurocharged.com

We built this engine and are aware of its capabilities. Our dyno also reads .5-.6 difference at the tail pipe. This tune has 11.8 commanded.

trabots

Thanks for that Jerry. It does make me feel however that emailed tunes are leaving something on the table. What do you reckon is the hp gain going from 10.8 to 11.8 AFRs at the top end assuming the charge cooling is sufficient to hold IATs below 140F? Having asked that and assuming the same with the cooling, how does the sensor know it is a blown engine with regard to the AFRs? With same IATs, why would the exhaust from a 700hp NA big V8 be any different from the exhaust generated by a smaller blown V8 making exactly the same power? I am not ragging on, just trying to get my head around why AFRs generally have to be so conservative in blown motors compared to the 12.8 AFRs in well tuned NA motors. Again, that is assuming the charge cooling is sufficient.

Jerry I am a happy chappy with everything Eurocharged have done for me. My 3 cars listed on my profile generate the following: The LS7 ute (cam and headers) did an 11.8 at 120mph at the strip and does the 100-160kph interval in 4.5 sec. The SL55 you tuned does this interval in 3.9 sec. From that one can surmise the SL55 would do at least an 11.2 quarter. You also tuned my E55 with ONLY an 83mm pulley and it matches the Ute at 4.5 sec so I would assume the E55 is also an 11 sec car. I use a V-Box timer for the intervals and must point out the Ute had a slow 2.0 sec 60 foot for that qtr mile time. All in all I am very happy with my 3 very different 11 sec cars.

This forum is great, most posters are chasing performance. I sold my manual 575 Maranello partly because only maybe 1% of the posters on Ferrarichat had ANY interest in making their Fazzas faster and I was getting roasted on the forum for the sacrilege of modding my car. It, by the way went from 5.4 sec to 4.0 sec (all 3rd gear so no shift as with the other cars) just with an exhaust port to tail pipe exhaust change and DMS tune. That is 599 fast! Check out this bend in the over the axle section of 2.25 inch exhaust pipe and it is easy to see why it responded so well to just an exhaust change. Fabulous looks and engine but put together atrociously. The SL55 is waay more fun to drive and the build quality waay better and waay cheaper to boot. Very over rated those F cars are.

99lightning

That car will run richer on the street. Even on my dynojet with my zeitronix sensor located just past the header will show a leaner number on the dyno vs street. Thats why i double check on the street af.

blackbenzz

Do you know how much timing you're running?

Windowguy

WOW on all levels. Not easy to do what you are doing.

Rob.

rawdvm

Jerry didn't tell me. But, he did say that he could put in 2 more degrees of timing if I can get the IATs down (another 20 - 40hp).

seanol

You will be leaner on an inertia dyno due to the mass equivalence. For a 248 it is 2500 lbs. Not sure about the 224, I think it is right around 2000 lbs. The car stock is probably closer to 3000+ lbs which would mean the car is not fully loaded on a pure inertia run.

When I tuned (a long time ago) I would use the prop air option and put a load on the drums when final tuning a car that I could not road test.

Max.H

With that speed driven stand alone. I would not be surprised if you eclipse 740WHP with E85. 24 PSI you can theoretically get about 850WHP if you keep temps in check. I would raise compression not lower it ;-)

blackbenzz

The one that nobody received yet? Lol

BC928

Development takes time. That is what early adopters sign up for.