NOS results for '01 RT/10

[treynor]

NOS results for \'01 RT/10

With all the recent talk of cast pistons roasting under the NOS flame, I was a bit nervous today as we strapped my 2001 RT/10 to the dyno. It was time to fire up the BTR NOS/Propane system I'd just had installed, and no one was entirely sure what was going to happen. I'm thus very pleased to announce that, so far, the system's a complete success. Using the "small" #46 NOS jet supplied with the kit, I picked up 140 RWHP consistently across the 3,000 - 5,000 RPM powerband used with NOS. As you can see in the chart below, midrange torque jumps even further.

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The limiting factor in today's runs was the rate of propane supply. Working with Tom of BTR Viper, we're going to switch to a liquid propane supply system in the next two weeks, allowing us to richen up the mixture and run a slightly larger NOS jet. I expect to end up with 160-170 RWHP at a conservative 12.5:1 mixture ratio. In early May, we're going to pull the heads and have a look at the pistons & rings to see if the NOS is damaging anything, but so far it looks good!

Fun dyno day pictures available here.

 

[Performin Norman]

Re: NOS results for \'01 RT/10

Wow, those are some great numbers. Good job. Makes me want to squeeze mine. hee hee

 

[H8TOW8]

Re: NOS results for \'01 RT/10

Very cool...great numbers. I am interested to get your take on how different it feels driving. Is it "mind-blowingly" faster? Just moderate? Lets face it, this car is fast stock. Curious to see if you can put into words the difference in acceleration.

I'm going to wait to put Tom's system on till you pull your heads and check for damage. No sense in blowing up TWO new Vipers

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[treynor]

Re: NOS results for \'01 RT/10

Sean,
The a/f is definitely lean by the end of the run. We were running NOS + gaseous propane with no other fuel enrichment, and the limiting factor for power seemed to be the rate at which the propane bottle can deliver propane gas.
For our next runs in a couple weeks, we're going to switch the system to use liquid propane by adding a siphon tube to the propane bottle. Doing so will completely eliminate the problem of propane delivery rate, and we'll be able to get the a/f down to the low 12s. Tom of BTR Viper's doing a bunch of fab and tuning work to pave the way for liquid propane use, so expect more news in the next two weeks.

 

[treynor]

Re: NOS results for \'01 RT/10

To answer your other question, the 413 RWHP # is with all the non-NOS mods in place. The battery was unplugged for part of the NOS install, so the ECU reset, and it defaults to a VERY rich mixture as you can see on the chart (11.7:1) which kills top-end power. My car most recently made 438 RWHP with the ECU adaption cycle partially complete.

 

[Supercharged Vipermad]

Re: NOS results for \'01 RT/10

To those who asked -- I haven't used the system on the street yet. The borderline A/F ratio makes me uncomfortable pressing the button without someone monitoring the ratio. As soon as we convert to liquid propane and get a couple other things finished (purge system, RPM window switch) I'll give driving impressions.

Objectively, torque jumps from 460 to 670 ft/lbs when the system activates. I expect that'll be like getting kicked in the a**

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[2charmed]

Re: NOS results for \'01 RT/10

Ben,

What other mods do you have (other than NOS)?

Regards,

Steve

 

[Supercharged Vipermad]

Re: NOS results for \'01 RT/10

Current mods:

K&Ns and smooth tubes
BTR/Belanger headers
High-flow cats
BTR/Belanger exhaust
Power Effects mufflers
MOPAR ECU
BTR half-shafts
Roe Racing a/f meter
BTR NOS/Propane system, 150 shot.

Current power: 438 RWHP, 485 RW ft/lbs.
Mods page: RT Viper Mods