Dyno Questions

InMotionJosh · #1 (**permalink**) 06-30-2009, 06:07 AM

I have a few questions about our trucks and dynoing them.

1. Has anyone done a dyno with no mods to get some accurate numbers at the wheels in stock trim?
2. Has anyone done a dyno with just a dpf delete to compare to see if there is any power to be gained by just removing it and the cat.
3. When I get on the dyno with the spartan tunes how do I make sure the converter is locked so that i can get the best results?

**eric.davis** · #2 (**permalink**) 06-30-2009, 08:02 AM

3. Your converter will lock at about 47-50 then once its there then hammer down and you'll be good

**08stroker250** · #3 (**permalink**) 06-30-2009, 08:02 AM

I'm not sure about the stock with and without DPF numbers. The guy up in Michigan dynoed his truck stock before he dynoed the 310 tune. Don't know if he had a stock DPF delete tune or if he dynoed the truck before he did the Spartan and delete. His truck made 280 rwhp stock tho.

As far as the converter being locked, David Dunbar told me that he gets a truck in overdrive to about 2,000 RPMs before he rolls in to it. This way the truck won't downshift.

InMotionJosh · #4 (**permalink**) 06-30-2009, 08:04 AM

Sounds good guys. I am hoping to get on the dyno tonight for a little bit before i pull the dpf. Then next week when i get back from my trip i hope to get back on and test teh 275v4 i was just sent.

**08stroker250** · #5 (**permalink**) 06-30-2009, 08:05 AM

Quote:

Originally Posted by eric.davis

3. Your converter will lock at about 47-50 then once its there then hammer down and you'll be good

Yes the converter locks that early, but if you get it locked at that low of a speed/RPM on a dyno before you roll in to it, the truck will downshift. 70 mph, or wherever your truck is at 2,000 RPM is a good place to start

dzchey21 · #6 (**permalink**) 06-30-2009, 08:08 AM

i did mine when i dyno'd and i let the converter lock (50mph) then i let out a little so it droped to about 40 mph. told the opperator to load it down and then just rolled into it, around 60 mph or so i was floored, put down 530 1076 with 275v3, very consistant all 3 runs, stock tuning may want to down shift more so like 08stroker said, stay around 2000 rpms or so and it shouldnt down shift.

up.mi.man · #7 (**permalink**) 07-02-2009, 08:51 PM

I brought my up to 70 and then hammerd on it till 4000rpm.
Thanks Dale

**08stroker250** · #8 (**permalink**) 07-02-2009, 08:58 PM

Quote:

Originally Posted by up.mi.man

I brought my up to 70 and then hammerd on it till 4000rpm.
Thanks Dale

What was the correction factor on your 592.9 pull and the pull where you made 1194 or whatever. Those numbers seem a bit high compared to other "310" numbers. I made 549.89 uncorrected with the "310" and Mike@PSN made 540 uncorrected....not sure what Aaron Rudolph made uncorrected, but it would have been really close to mine because ran on the same dyno and made within 4 horsepower with a 1.02 SAE correction factor. Your numbers are just WAY higher than everyone elses