Nitrous Dyno Results

[SRTim]

I had my car dynoed with the BTR Viper nitrous kit yesterday.

Max hp without nitrous=421.5
Max torque without nitrous=466.3

Max hp with nitrous=575.8
Max torque with notrous=648.1

The nitrous gave me 154.3 more hp and 181.8 more torque.

I had the largest jets supplied with the kit installed for this dyno run.

The air/fuel ratio was about 13.5 with the nitrous on.
I am going to put a larger propane jet in and have the car re-dynoed in two weeks. I will post those results when I get them.

The lower of the two graph lines is the hp and the other is the torque. Both the nitrous run and dry run are represented on this graph.

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[Performin Norman]

Awesome numbers. Love that laughing gas.

 

[SRTim]

Approximately how much Horsepower do I lose throughout the drivetrain?


Tim

 

[LTHL VPR]

Why did you stop te runs at 5000rpms? The hp and tq are still well above stock and the hp is still climbing. Also do you have a printout of your A/F results as well.

BTW- Viper loses between 12-13% from crank to wheels.

 

[SRTim]

I realize that I would have gotten more horsepower if I had gone past 5000 rpm with the nitrous on as the car was making the most hp around 53-5400 rpms. Tom Welch told me to not exceed 5000 rpm on nitrous for safety reasons. I did not get a printout of the a/f ratio, but when I go back in 2 weeks I will ask for one...this was done on a DynoJet and the a/f ratio was shown on the computer screen while the car was revving.

Tim

 

[Supercharged Vipermad]

Tim,
Was this using liquid or gaseous propane, and was it using the BTR fuel enrichment circuit or just propane for fuel? Your numbers are similar to what I saw using #46 NOS / #40 propane gas, no fuel enrichment.

 

[SRTim]

We were concerned that the fuel enrichment controller was not working, but we ran the car with the bottles off and the switch on and it was indeed working.

I am using the normal BTR setup that he sells from his website...the propane I have in the bottle is from the local propane supplier...I believe it's liquid?

I'm going to put a larger propane jet in to richen the a/f ratio soon and will post the new dyno results.

Tim

 

[LTHL VPR]

What fuel enrichment method were you using? Was it an NOS box that piggybqacked on the computer?
I would love to see a dyno A/F run with the bottle off and the fuel enrichment on.

 

[SRTim]

I am using the fuel enrichment controller supplied with the BTR kit. We did in fact make a run with the bottles off and the nitrous switch on-to check the fuel enrichment controller and it was working. I don't remember the exact numbers, but I think the a/f ratio went into the 11's with the bottles off?

Tim