Quote:
Originally Posted by djctoto
The question of safely running E40 with a modified pulley is still confusing to me.
David's dyno results on E40 are reportedly stated as:
"on the Mustang Dyno. Our final "Track Safe" pull hit 788whp and 839Lb-Ft of torque."
For a car running a 9.20 lower pulley.
Then in a subsequent post David is quoted as saying:
"This car was built so it will be reliable... the runs we made were Pump Shell 93oct, 20%, 30% and then 40% E85 purchased at Racetrac locally here in Florence. I have run my car all the way to E47% and only in the hot South Carolina humidity did I ever begin to have fueling issues with an IAT of 110º which lead me to adding more 93oct to reduce it to 40% to eliminate the issue."
Which indicates that taking his car from e47 to E40 eliminated the issue or concern.
And then as I stated in an earlier post and was told by David and will swear in court this is true:
"Because I also distinctly remember you telling me when you tuned my car on E30 that you had run yours with the stock fueling system on E40 but this was on the "hairy edge"
So this is confusing not so much for me personally as it should be for the owner of this car who under the advise of David and Patriot Motorsports USA has been informed by them that it's safe to run their car under the most demanding track conditions at E40.
Something is not adding up.
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The highest I have ever run my car NOT on the dyno but on the track was an E47% which caused the car on a 120º track temp, 98º ambient temp and 400-feet above sea level where Road Atlanta is just under 1000' of sea level. It was at CMP where I had the car hiccup due to not enough fuel and Thank GOD the Banks iDash gave me a bright alert that I was hitting a knock due to running her lean AF! I immediately went into the paddock, added some Sunoco straight no ethanol fuel at $14/gallon and the ethanol content dropped to 30-ish percent. From there I reset the code and CEL to go back on the track to beat this bish a little more!
There is a vast difference in fueling between E40 & E47% and depending upon how the car is tuned, with the environment it is being operated within, safe. Once again... my car is tuned to the absolute edge, so when I have an issue, I know it is at a threshold my customers should or unable to reach. There is always a buffer there which is why I stated earlier that I could give my customer more power and with Jeni as witness I sat down in our waiting area, explaining to the customer how close I still took the car and he told me to push it. We went a little further, but not anywhere this car could be determined to be unsafe at tracks like Sebring which is almost at Sea Level.
Once again... Density Altitude is a huge factor when tuning and knowing where you can and cannot go determines if you win or lose some days. If you do not know where that edge is, then you can never deliver your best work. There is so much more than just reflashing the ECU and watching the car go away in the hands of the customer and I certainly am not here to share everything we do to get there... but I share more than most in hopes that the effort to resolve issues when on the road course are made clear.