Inline Throttle Stop

Bill Baer · 02-27-2016, 12:33 PM

I have used both inline and under the carb stops.
The inline I used with a ron's methanol fuel injection and it worked well in hot weather However in the fall when temps dropped in the 60's it was not consistent and not predictable. ( the F.I. Was too fat on the stop)
If you use this type of stop you absolutely must have a solid pedal stop.

The #1 stop under carb stop with a Quick Fuel gas throttle stop carb was the easiest to set up and dial in.
I also think it's safer as it is independent of the throttle linkage.
The only thing I don't like about this set up is that racing gas is much more expensive than methanol.

I cannot afford a Maxx Speed carb/stop but I would like to try one.

nomad · 02-29-2016, 10:31 AM

Working with an inline stop a .90 car has to deal with two accelerator pump shots. One at the hit and another when the car comes off the stop. An undercarb stop only has the pump shot at the hit. The dynamics of all this is easily seen on the RacePak O2 graph.

Bill Baer · 03-11-2016, 11:01 PM

Quote:

Originally Posted by nomad

Working with an inline stop a .90 car has to deal with two accelerator pump shots. One at the hit and another when the car comes off the stop. An undercarb stop only has the pump shot at the hit. The dynamics of all this is easily seen on the RacePak O2 graph.

Makes sense to me. Perhaps I should invest in a O2 sensor fir my data logger. To better understand the A/F ratio on the stop.

Shake & Bake · 03-30-2016, 07:36 PM

I have O2 sensors and EGT's in all 8 tubes. Make a hit and come back to the trailer and hook up the data logger. It's a pretty quick way to see if or when the motor is going lean or is too rich.

Once you get the air/fuel mixture right you should be able to Shake & Bake!

02-29-2016, 10:31 AM	#2
nomad Junior Member Join Date: Oct 2013 Posts: 47 Likes: 5 Liked 7 Times in 4 Posts	Re: Inline Throttle Stop Working with an inline stop a .90 car has to deal with two accelerator pump shots. One at the hit and another when the car comes off the stop. An undercarb stop only has the pump shot at the hit. The dynamics of all this is easily seen on the RacePak O2 graph.

03-30-2016, 07:36 PM	#4
Shake & Bake Member Join Date: Mar 2010 Posts: 312 Likes: 40 Liked 37 Times in 33 Posts	Re: Inline Throttle Stop I have O2 sensors and EGT's in all 8 tubes. Make a hit and come back to the trailer and hook up the data logger. It's a pretty quick way to see if or when the motor is going lean or is too rich. Once you get the air/fuel mixture right you should be able to Shake & Bake!

02-27-2016, 12:33 PM	#1
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Inline Throttle Stop I have used both inline and under the carb stops. The inline I used with a ron's methanol fuel injection and it worked well in hot weather However in the fall when temps dropped in the 60's it was not consistent and not predictable. ( the F.I. Was too fat on the stop) If you use this type of stop you absolutely must have a solid pedal stop. The #1 stop under carb stop with a Quick Fuel gas throttle stop carb was the easiest to set up and dial in. I also think it's safer as it is independent of the throttle linkage. The only thing I don't like about this set up is that racing gas is much more expensive than methanol. I cannot afford a Maxx Speed carb/stop but I would like to try one. __________________ Bill Baer 3391 SC, 339B SC, QR Last edited by Bill Baer; 02-27-2016 at 01:15 PM.