Stall Question

Ron Gusack · 07-29-2015, 11:45 AM

My stall speed has gone from 5200 in 48 DA to 4800 in 2600 DA. Is this because the engine makes more or less power depending on the air? Is 600 rpm normal for this or is something wrong with the converter/trans?

Thanks for any guidance

Alan Roehrich · 07-29-2015, 12:59 PM

Fairly common. It depends upon how much a given engine is affected be weather, and how well it is tuned for prevailing conditions. The more torque is lost due to weather, the more the stall RPM drops. People that have to race heads up often change the converter and the rear gear for the weather. I have customers who have a "Denver converter" they swap in. Or a "heat of summer sticky weather converter".

Ron Gusack · 07-29-2015, 02:49 PM

Thanks Alan, it makes sense I just have never seen it on a graph before. I need to be able to log trans temps, because I often forget to look at the gauge at a consistent time. BTW, about 2 years ago you told me I should be going 1.28 60's with a decent suspension and I didn't think it was possible given the tracks I run at. IDK how good my suspension is, but I did change a bunch of stuff and it went 1.288 last October. That's a world record for this combo, but it was in world record air too, like -700.

ss3011 · 07-29-2015, 07:41 PM

This was a good thread about converters.

http://classracer.com/classforum/showthread.php?t=58649

07-29-2015, 11:45 AM	#1
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Stall Question My stall speed has gone from 5200 in 48 DA to 4800 in 2600 DA. Is this because the engine makes more or less power depending on the air? Is 600 rpm normal for this or is something wrong with the converter/trans? Thanks for any guidance

07-29-2015, 12:59 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,111 Likes: 1,570 Liked 1,814 Times in 413 Posts	Re: Stall Question Fairly common. It depends upon how much a given engine is affected be weather, and how well it is tuned for prevailing conditions. The more torque is lost due to weather, the more the stall RPM drops. People that have to race heads up often change the converter and the rear gear for the weather. I have customers who have a "Denver converter" they swap in. Or a "heat of summer sticky weather converter". __________________ Alan Roehrich 212A G/S

07-29-2015, 02:49 PM	#3
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Re: Stall Question Thanks Alan, it makes sense I just have never seen it on a graph before. I need to be able to log trans temps, because I often forget to look at the gauge at a consistent time. BTW, about 2 years ago you told me I should be going 1.28 60's with a decent suspension and I didn't think it was possible given the tracks I run at. IDK how good my suspension is, but I did change a bunch of stuff and it went 1.288 last October. That's a world record for this combo, but it was in world record air too, like -700. Last edited by Ron Gusack; 07-29-2015 at 03:11 PM.

07-29-2015, 07:41 PM	#4
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: Stall Question This was a good thread about converters. http://classracer.com/classforum/showthread.php?t=58649