Confused about Hp gains

eej711 · #1 Sat, July 9th, 2011, 01:52 AM

I have a 07 4.6L. I plugged in my gryphon to Pegasus and downloaded my 1/4 mile tests. The results after I put in my truck weight was 252.43 at the "estimated flywheel HP" and the stock HP is 248

. I was expecting more than just a little over 4 HP gain from the Gotts mod, SI/DO exhaust and 87 performance custom tune on my gryphon. Did i do something wrong or is that the only HP gain i actually have?

***88Racing*** · #2 Sat, July 9th, 2011, 09:07 AM

That's an example of a gross estimator with built in fudge factors.....

Its an estimate.....stick yer truck on a dyno for hard numbers.....

eej711 · #3 Sat, July 9th, 2011, 01:28 PM

Is the flywheel HP around the same numbers as the rwhp?

***Longshot270*** · #4 Sat, July 9th, 2011, 08:26 PM

The flywheel HP is what the engine is estimated to make. The rwhp is what is left over after parasitic loss.

Take it to a certified drag strip to get times and weights. My programmer was off by a half second or so.

What was your time and speed?

eej711 · #5 Sun, July 10th, 2011, 04:04 AM

Well hopefully I got such little hp gain because of a bad run. Hopefully next time results in more than just a gain of 4 hp.

82.605 mph and 17.34 seconds, not very excited about that...

I'm going to run it again soon and hopefully get a better reaction time and an overall better run.

Lowdown89 · #6 Sun, July 10th, 2011, 09:27 AM

Does your truck feel faster to you? After my the custom 87 tune on my buddies 07 STD cab 4.6 truck the times didn't greatly improve according to the g tech meter we have but it sure did turn into a completely different truck to drive so much nicer to drive now