New Shift Kit Developed

[joe62890]

Originally Posted by Tim

I am anticipating the long term report after 1000 miles. The big spike kinda worries me but looks promising so far

Haha, I thought the same thing. Might have to hold out on this one to see how many drivetrains grenade.

[wannarace928]

And for anyone that doesn't read the other forum, Budfreak has over 1000 miles on his and all is well. (And RD is not babied, especially during testing)

In theory, shouldn't tranny temps decline due to less slipping?

[TomsSVX]

Originally Posted by wannarace928

And for anyone that doesn't read the other forum, Budfreak has over 1000 miles on his and all is well. (And RD is not babied, especially during testing)

In theory, shouldn't tranny temps decline due to less slipping?

Yes, but in theory the HP spike shouldn't happen either... There is something off there and it doesn't look right... I have no idea why they didn't plot HP vs RPM MPH is worthless.... More importantly, there is no way to actually make 220whp with an engine that makes 230crank... Like I said something it very wrong there

Tom

[oab_au]

Originally Posted by TomsSVX

Shocks like that to the drivetrain will cause severe damage... Its not that the stock drivetrain won't hold 220whp its that a 70hp spike like that will shatter your axles, differentials, planetaries... you name it, its gonna break

Tom

Don't be such a naysayer Tom, just because you like pulling a stick.

The torque peaks are due to the torque converter multiplying torque, due to the difference in engine/transmission speed. It is not a shock, it is a nice surge.

I have had it on my Australian model for over 12 months, done many miles, many Gtec runs, with no problems. It just makes the gear box change gears like gear boxs did before the intervention of computers.

I do recommend that it only be fitted, to a good working gear box, with a well adjusted brake band, and a working AWD.

Harvey

[Sir. Nate]

I'm ordering one as soon as I have the money.

[SomethingElse]

I did not see a picture yet. what does it look like?

[b3lha]

Why the dyno plots are so different? I'm not trying to pour cold water on Harvey's invention, but this doesn't make sense.

Surely the QC only modifies the gearchange. Therefore the only substantial difference should be in the 1 second of the dyno run so that the transmission is shifting from 1st to 2nd.

[b3lha]

Originally Posted by Trevor

Control is signalled from the TCU to the ECU via a cable connection in the loom between the two units, i.e. (B68) TCU - 16 to (B59) ECU - 20. The signal is normally at 5 volts and it would appear that reducing this signal will cut engine torque. Therefore a resistor in this line, with a normally closed switch or relay across it, should provide a means of a selectable cut or reduction in the normal degree of torque control.

I don't follow your reasoning Trev.

The torque control is a binary switch not a voltage. It is either On or Off, ie "Ground" or "Not Ground". What is the benefit of introducing a resistor into the circuit? The engine torque is not in any way proportional to the voltage on this line.

[TomsSVX]

Originally Posted by oab_au

Don't be such a naysayer Tom, just because you like pulling a stick.

The torque peaks are due to the torque converter multiplying torque, due to the difference in engine/transmission speed. It is not a shock, it is a nice surge.

I have had it on my Australian model for over 12 months, done many miles, many Gtec runs, with no problems. It just makes the gear box change gears like gear boxs did before the intervention of computers.

I do recommend that it only be fitted, to a good working gear box, with a well adjusted brake band, and a working AWD.

Harvey

Harvey, it says in the manual, " In order to reduce gear shift shocks and protect transmission gears, engine torque is controlled shifting up under heavy loads or when the transmission is in the manual mode." What this kit is doing is negating any protection the car has built in for the transmission. There are two spikes that really concern me, The 1-2 shift and the 3-4 shift. These are ver close to 100ftlbs in difference and there is nothing smooth about them. I wish the people who get this the best of luck but I do not see this ending well.

Tom

[lechnoid]

Removed by me until Harvey decides his product is complete and is ready to discuss it with the open market.

[wannarace928]

As requested by SVXride, the 1st and 2ed dyno runs on the same sheet of papper.

[poweredx2]

I will try one of the kits based on the fact of spraying anything from 75-150shot at the top of first gear into second didn't break my tranny,I am pretty sure since I put 250k miles on that tranny and with a recent rebuild last month all should go well.

[oab_au]

Most of it stems from a lack of knowledge of Torque Converters.
This is not a manual transmission, doing a flat change from 1st to 2nd, where the clutch is banged home on a revving engine to pull its speed down to the lower ratio. This will stress the driveline.

The Auto has a Torque Converter between the engine and the transmission, this acts as a flexey unit that not only absorbs any shock, but also multiplies the torque on the way.
When the engine winds up in 1st to about 6500 for the gear change, the Impeller and the Turbine are both spinning at approximately the same speed. When the change takes place, the Turbine (that is attached to the transmission) slows to the new ratio’s speed. The Impeller (that is attached to the engine) is still spinning at 6500. Whenever the Impeller is spinning faster than the Turbine, a torque multiplication takes place.

In other words the engines torque, hence power, is multiplied by the factor of the speed difference, till the turbine spins at the same speed as the engines Impeller. Most will know that this happens at stall, starting off. But it will happen at any speed, if there is a difference in the rotational speed of the two converters elements.

So what we have happening here is, instead of the engines torque being reduced by 50% while the change takes place, the engines torque is increased by the multiplication factor of the speed difference of the converters elements. This is a smooth action

Harvey.

[poweredx2]

Great info.

[oab_au]

Originally Posted by poweredx2

Great info.

I think we will see a revival of Autos for the strip.

Harvey.