Dyno questions with a stall
Dyno questions with a stall I just put in a Yank SS3800,new built tranny,my questiion is how much hp im I going to lose from the unlocked stall?I dynoed about 30 less hp then before? Is this normal?
Originally Posted by 2000Blackout
I just put in a Yank SS3800,new built tranny,my questiion is how much hp im I going to lose from the unlocked stall?I dynoed about 30 less hp then before? Is this normal?
That seems about right to me.
Take a look at the locked vs unlocked dynos of a YPT4400 in the link below. There is almost a 40 hp difference at 6000rpm.
https://ls1tech.com/forums/generation-iii-internal-engine/132000-finally-dyno-d-my-10-second-cam-only-setup.html
The guy runs high 10s with a cam only
John
Originally Posted by 2000Blackout
Okay so me seeing the 30hp loss is common with a high stall?I was very dissapointed in my numbers with my mods.
John
Originally Posted by Hugger SS
Yanks normally lose about 8-10 rwhp lbetween ocked and unlocked
If you dyno 400hp locked and 390 unlocked then the converter would be 97.5% efficient. It is unlikely you will see that kind of efficiency on a 4000+ stall at 6000 rpm.
John
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Originally Posted by Hugger SS
Thats what I saw on my PT4200 and I know of a few others...Now when I had my vigilante converter...It was about 30 rw difference
You got a good one!
I can tell you that with my PT4400 I only saw 90% efficiency (measured on the street) at 6200 rpm running 3.23 gears. Below 6000 efficiency was 80%-85%.
John
Last edited by JNorris; Jan 24, 2004 at 02:55 PM.
Originally Posted by 2000Blackout
I dont have a lock up switch so i couldnt compare my numbers,it gained a ton down low,but flatens out at 5400??
So your comparison is between the stock TC and the SS3800 both being unlocked?
Can you post your dyno?
John
Originally Posted by JNorris
That is 93% efficient. What RPM was that measured at?
How about with the Vig 3200?
How about with the Vig 3200?
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Originally Posted by JNorris
That is 93% efficient. What RPM was that measured at?
How about with the Vig 3200?
How about with the Vig 3200?
dont have a number id say 5200 rpm by the peak on the graph????
havent dynoed with the vig yet....