[MX-5]

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.