93 LT1/6-Spd Build Thread
Thread Starter
Racer
Joined: Sep 2014
Posts: 294
Likes: 119
Based on the timing of when the original dyno test was done and when I picked the car up (it was smelling like gas from the get go), I believe the original regulator was failing during the dyno test...which I find hard to believe but there it is. The car ran great during December after I installed the second Holley regulator, seems to be even better. I suspect that the fuel pressure was off a bit. Also the Aeromotive unit appears to have a replaceable diaphragm...the Holley diaphragm was not replaceable, the entire unit had to be swapped.
Also looks like there is no point in winding it out much past 5800rpm.
Last edited by Jaye Bass; Feb 6, 2020 at 06:24 PM.
Le Mans Master
Joined: Aug 2015
Posts: 6,119
Likes: 1,996
From: St. Charles MO
I was going to ask about that. It looks to me like that isn't the actual torque and power falling off hard, but rather that the dyno operator just stopped the test and let off the pedal at that point. Otherwise, something else seems to be going on to cause a drop that steep! ON EDIT: Is that just the redline programmed into the ECM kicking in? If so, you'd benefit from raising that and seeing how much more power it would build, because it really doesn't look like it was done.
Last edited by MatthewMiller; Feb 6, 2020 at 06:42 PM.
Melting Slicks
Joined: Mar 2016
Posts: 2,778
Likes: 580
From: Langley BC
I agree with Matthew Miller looks like in the old dyno it ran out of fuel.
I also wonder if raising the redline a bit would get you a bit more power it lools to me like the dyno run was just ended rather than the engine nose diving at the end, or lile matt said maybe that was the rev limiter?
I also wonder if raising the redline a bit would get you a bit more power it lools to me like the dyno run was just ended rather than the engine nose diving at the end, or lile matt said maybe that was the rev limiter?
Thread Starter
Racer
Joined: Sep 2014
Posts: 294
Likes: 119
I was going to ask about that. It looks to me like that isn't the actual torque and power falling off hard, but rather that the dyno operator just stopped the test and let off the pedal at that point. Otherwise, something else seems to be going on to cause a drop that steep! ON EDIT: Is that just the redline programmed into the ECM kicking in? If so, you'd benefit from raising that and seeing how much more power it would build, because it really doesn't look like it was done.
I agree with Matthew Miller looks like in the old dyno it ran out of fuel.
I also wonder if raising the redline a bit would get you a bit more power it lools to me like the dyno run was just ended rather than the engine nose diving at the end, or lile matt said maybe that was the rev limiter?
I also wonder if raising the redline a bit would get you a bit more power it lools to me like the dyno run was just ended rather than the engine nose diving at the end, or lile matt said maybe that was the rev limiter?
Le Mans Master
Joined: Aug 2015
Posts: 6,119
Likes: 1,996
From: St. Charles MO
Definitely do, because it was still building power. FWIW, a stock LT4 was rev-limited to 6400rpm from the factory in the stock PCM tune.
