STS dyno results - Hemi Truck Club
 
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Old 02-09-2005, 02:35 PM   #1
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STS dyno results

Well, here are some results. I don't have the files to post graphs but they probably wouldn't be worth much because they look so odd due to the boost falling off. With my 4.56 gears, my runs were over so fast that you couldn't keep boost. It keeps boost on the street, but not on the dyno. So it never made it to full boost on the runs, and whatever boost it did make it up to it would start losing it before the run was over.

My baseline was 261hp and 309tq.

So, the low boost level of 5psi....on the dyno it made it to 3.3psi and again, it didn't stay there long and started to drop. At 3.3psi it made 371.2 tq and 302hp. Killer tq for only 3.3psi and the 302hp was at 4400rpms and then it dropped because boost fell off.

At the high setting which is 7psi, I don't recall what psi it made it to on the dyno, but it wasn't 7psi. And again, it didn't stay at that boost long and dropped off. But it still tagged 425tq and 325hp. The tq is awesome because it catches that down low before the boost drops off so you never see max hp.

We attempted a 10psi pull. Again I don't recall what it made it to boost wise but it tagged 507tq and 427hp.

Overall, it's an awesome base. My a/f was wacky because of the boost dropping off so quick in the upper rpms. I don't have good readings on that. It'll be important to watch my wideband o2 when on the street when things are "normal".

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Old 02-09-2005, 05:12 PM   #2
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STS dyno results

Welcome to the club! Sweeet numbers, 427 HP, awesome! Need to get a G-tech and see what it says at the strip!
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Old 02-09-2005, 05:14 PM   #3
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STS dyno results

Looks like your first post here, so welcome to HTC.com Hemifever - we're glad you found us! Thanks for the Dyno info on the STS turbo.
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Old 02-09-2005, 08:06 PM   #4
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STS dyno results

Welcome, Hemifever. I see your truck is just like mine, only with way more mods.
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Old 02-10-2005, 04:15 AM   #5
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STS dyno results

welcome to htc. hemifever. guys i have meet hemifever and he is a great guy. i cant wait to see that turbo inperson!!!!!!!!!
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Old 02-10-2005, 07:20 AM   #6
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STS dyno results

Welcome H/F, Did you throw down the extra coin for their intercooler system?
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Old 02-10-2005, 09:40 AM   #7
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STS dyno results

I went with the meth injection. More maintenance in the long run, but easier on the pocket in the short run.
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Old 02-13-2005, 09:34 AM   #8
 
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STS dyno results

hey hemifever! good to hear from you. i'm the guy whose programmer got mixed up with yours. congratulations on the sts. i'm following the threads on both the sts and the gsm/paxton and may make the leap later this year. keep us posted.
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Old 02-18-2005, 07:21 PM   #9
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STS dyno results

Hey Hemiheel. I'd like to get mine back on the dyno now. I got my boost issue worked out and I now hold boost. My last dyno #'s my boost was bouncing all over the place.

Also, my truck might get sent to another state next week. A company wants to design a Vortec FMU around this STS system. That way they'll utilize my stock injectors for even fuel flow vs. the 9th injector spraying wet into the intake. They run f/i on the 4.7s and use this fmu system so he thinks it'll be an easy design and install. Once it's working, they'll sell the units separatly or with an f/i system.
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Old 03-02-2005, 02:39 AM   #10
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STS dyno results

From Sport Truck Magazine....
Horsepower gains over base at the rear wheel measured 154 new ponies.
Several more buckets of torque as well...179 ft lbs at the rears over the stock base.
They said 4-6 hours to bolt it on with no cutting involved.
The article said it is still very driveable in daily trffic and is very managable until you want it to show its teeth.
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