Throttle/RPM gauge lag

[Breezybro]

So, beings I couldn't find a thread about it, does anybody have any solutions to the throttle lag when you accelerate? I know the Trifecta Tune is supposed to get rid of some of it.. but how much? Appreciate the responses.

Also, quickly, any luck on fixing the RPM gauge lag? Or are we stuck with it without an aftermarket. Thanks.

 

[ss2000slp]

The tune will make a huge difference. Also check out MPFabs thread about bypassing the bypass solenoid. And as far as I know, no one has a solution for the tach not keeping up with the revs. I remember a while ago Preloader was looking into an aftermarket tach, idk if he came up with anything.

 

[rdss]

The tune updates the drive by wire throttle tables giving a more 1:1 response and an aftermarket tach is the only way to solve the lag in the rpm gauge.

 

[sx sonic]

What RDSS said.

Also note the aftermarket tach can NOT be tied into the same RPM source as the factory tach. That signal speed is too slow. It must be tied into a real time, unaltered crank signal.

I can't recall what Preloader used for his Tach signal but he did find one that worked. It made a huge difference in RPM accuracy in neutral and the lower gears. He's also sporting a clutch that weighs 1/2 as much and is making almost twice the power of stock so it made a huge difference.

 

[Breezybro]

What RDSS said.

Also note the aftermarket tach can NOT be tied into the same RPM source as the factory tach. That signal speed is too slow. It must be tied into a real time, unaltered crank signal.

I can't recall what Preloader used for his Tach signal but he did find one that worked. It made a huge difference in RPM accuracy in neutral and the lower gears. He's also sporting a clutch that weighs 1/2 as much and is making almost twice the power of stock so it made a huge difference.

Do you know if you can tie the stock tachometer into the "aftermarket source"? I really don't want to have two tachometers :/

 

[Breezybro]

Do you know if you can tie the stock tachometer into the "aftermarket source"? I really don't want to have two tachometers :/

Shameless bump, trying to decide what gauges and items to buy!

 

[SuperSonicRS]

Will the OBD2 reading be more accurate than the stock gauge, or is it the same?

 

[laborsmith]

AEM digital shows about 195-6 for water temp while UG shows around 201.

UG shows higher temperatures from ambient at a quicker pace than the AEM gauge.

The AEM gauge at its highest is consistently 4-6 degrees lower than the UG engine temp.


Laborsmith

 

[Maddmatts]

What RDSS said.

Also note the aftermarket tach can NOT be tied into the same RPM source as the factory tach. That signal speed is too slow. It must be tied into a real time, unaltered crank signal.

I can't recall what Preloader used for his Tach signal but he did find one that worked. It made a huge difference in RPM accuracy in neutral and the lower gears. He's also sporting a clutch that weighs 1/2 as much and is making almost twice the power of stock so it made a huge difference.

I believe he tapped directly into the ignition module itself. There's a signal wire from the PCM telling it when to fire. This is where tachometers of old got their signal from before the CAN network came around.

 

[Preloader]

That's correct. I used a tach signal adapter that takes the firing signal to the coil and sends it to the aftermarket gauge.

I would have preferred to just drive the stock tack, but I doubt it reads signal pulses. I more likely reads a binary signal from the ECM. Which is the main issue causing it to lag. The limited processing power of the ECM has bigger priorities than focusing on a signal to the tach.

In all honesty, installing a tach signal adapter and just using it to drive an aftermarket shift light is the way to go. I still look at my stock tach out of habit during daily driving. And during aggressive accelerating, I'm keeping my eyes on the road. That's where the shift light becomes valuable. You don't need to look at it. When it lights up, you know...... So do all the cars around you.

Here's the thread cataloging my aftermarket experience.
http://www.sonicownersforum.com/forum/aftermarket-crowd/7747-aftermarket-tach.html

 

[pbkn1p]

I know this is an old thread but something weird happen to my RS today.
While driving. Without shifting into any gear, the rpm suddenly drop and then go back up.

Now the engine didn't lose power
And one of the time (4 total ) I was slowing down while in gear. But I didn't feel a loss of power.
This is weird to me.


Oh and I've looked on Here for anything about this but I haven't found anything. If anyone has any info as to why or how this happens I would greatly appreciate any info.
Thanks in advanced!



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