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Nitrous users! Important news for auto trannys

 
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Old 31 Aug 2003, 01:29 pm
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Join Date: May 2003
Location: South Bend, IN.
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Default Nitrous users! Important news for auto trannys

I have great news for those with automatic transmissions.

I have designed and built a nitrous delay box to allow the auto trans to kickdown into a lower gear prior to the sudden spray of horsepower.
This also lets you launch from a start without wasting precious time spinning the wheels and sending the traction control system into orbit.
This delay, in conjuction with a wide-open throttle activated nitrous system, allows for consistant launches and a reliable dial-in time when racing.

Problem:
The sudden burst of power causes excessive wheelspin and kills the 60/ft times and 1/4 mile ETs. It wastes a precious second roasting the tires at the dragstrip.
The burst of nearly 100hp DURING the auto tanny downshift is putting extreme stress on the tranny. We all know the 41TE auto trans isn't known for reliability.

Solution:
Delay the nitrous by nearly a second.
Punching the throttle while moving gives the tranny time to find the lower gear and get the engine rpm's up where they need to be to make horsepower BEFORE slamming an extra 100hp through it.
The delay let's us launch from a standstill, get moving about 5mph, and get the rpm's above the torque converter stall speed prior to ramming the extra power through it. This keeps the power to the pavement.

Details:
I searched around and found that the nitrous delay/controller modules available are very costly and do more than I need for a lowly street driven 4-cylinder.
They start at around $200 and go over $500!
All I need is a delay adjustable from 1/4 second to about 2 seconds. This lets me fine tune the delay.
So.... I decided to design and build a simple nitrous delay box.
I'm beta testing mine right now.
I've had a lot of local NOSketeers asking for one already.
I've got enough parts to build 4 more for testing.
If there is a substantial demand, I will consider a production run.
( E-Bay... here I come! )

Requirements:
Everyone running nitrous should be using a relay to trigger the solenoids. That's important.
Everyone should be using a wide-open throttle switch to activate the relay. That's important for consistant ETs.
The delay splices in series with the relay control circuit. It supplies a time delayed path to turn on the relay.
It ONLY works for the low-current relay coil. It will not directly control the 10amp draw of a nitrous solenoid.
There are only 3 wires to connect.



Give me some input.
I see a need for myself, so I built it. Is there a need for others?
Do you see this as a benefit in your personal situation?

My bio: (for those who don't know)
I'm a Master ASE certified career mechanic.
I have a degree in electronics.
I run a performance shop, complete with race fuel and a nitrous refilling station.
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Old 01 Sep 2003, 03:04 am
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Although I dont have a PT neither NOS, My Cirrus has the same tranny and I am willing to buy NOS so give us the estimate cost and we can give it a try
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Old 26 Dec 2003, 04:19 am
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How has your delay switch been doing, MX-5? Did you just use an RC circuit?

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Old 26 Dec 2003, 12:46 pm
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Everything has been submitted to an electronics manufacturing facility. They specialize in small runs of less than 1000.
Since my PT is stored for winter, I've not been focussed on the delay box lately.

Everyone love it! Not one glitch.
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Old 26 Dec 2003, 05:16 pm
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Quote:
quote:Originally posted by MX-5

Everything has been submitted to an electronics manufacturing facility. They specialize in small runs of less than 1000.
...
Cool! Can you share their contact info? I have an invention of my own that may fill a small niche.

If I deploy a nitrous system (I keep telling myself that I am not, but I am not very convincing []), I will definitely include your...(what are you calling it?).

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Old 26 Dec 2003, 08:46 pm
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Default

JPD Controls
574-258-0059
Mishawaka, Indiana.
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Old 26 Dec 2003, 10:21 pm
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Quote:
quote:Originally posted by MX-5

JPD Controls
574-258-0059
Mishawaka, Indiana.
Thanks, bud!

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Old 05 Jan 2004, 08:56 pm
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MX-5, What do you do about detonation.
If you just install a kit how do you get the timing
to retard before you give it the squeeze.

Thanks
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Old 05 Jan 2004, 10:14 pm
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Because the PCM automatically goes into open loop with a very conservative fuel/timing strategy.
You can get 37 degrees timing advance up to 85% throttle angle. At that point, it drops to a maximum of 24 degrees advance. This is why the PT can run 87 octane with a 100hp NOS shot.
The NOS is on a WOT switch. It cannot spray with the timing advanced beyond 24 degrees total advance.


I do not just throw a system on an engine. This is the kind of research, along with dyno tuning, that separates the professional tuners from the hacks.
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Old 06 Jan 2004, 01:06 pm
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OK I have a small NOS kit I built but I have not installed it.
I would like to in the near future. I have a single fogger nozzle.
I also purchased jets for 30hp, 50ho & 75hp. I could inform you with the Jet size I have selected. I was worried about detonation. A friend has a NOS kit and the Jet computer to retard the timing before a 75hp squeeze.
I saw it work and he can keep up with a turbo at the track. He said you gotta keep fresh plugs in it and they really take a beating.
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