Author Topic: Throttle Delay - Has anyone been able to tune it out? (Read 19268 times)

rich71 · « **on:** April 10, 2011, 07:49:06 AM »

I am wondering if anyone has been able to tune out the fly by wire throttle response delay?.... I don't want to revisit the sprintbooster debate as thats not what I am asking

. Does the update to hpt have the ability to modify it? I really do not like the delay, especially when doing spirited driving in winding valley roads. It feels odd to try to blip the throttle ahead of when i normally would on a non delay pedal. I know its is only a second or so, but it makes the flow of down shifting feel odd.

shabby · « **Reply #1 on:** April 10, 2011, 08:37:31 AM »

Quote from: rich71 on April 10, 2011, 07:49:06 AM

Does the update to hpt have the ability to modify it?

Yes it does but i don't think they fully get rid of it, im gonna play around with it today to see how it works.

snaponbob · « **Reply #2 on:** April 10, 2011, 08:38:08 AM »

THROTTLE delay, or TURBO LAG ???? If you have HP Tuners, the throttle response can be tweaked. Lyndon can certainly do this.

shabby · « **Reply #3 on:** April 10, 2011, 09:18:30 AM »

Its actual throttle delay, it takes 1 second for the throttle blade to go from half open to fully open at wot.

snaponbob · « **Reply #4 on:** April 10, 2011, 11:16:14 AM »

Quote from: shabby on April 10, 2011, 09:18:30 AM

Its actual throttle delay, it takes 1 second for the throttle blade to go from half open to fully open at wot.

It's an emissions thing. Same with the lazy throttle off drop in rpm. It turns out that the flywheel IS 29 pounds, so THAT is not why it revs up and down so slowly.

shabby · « **Reply #5 on:** April 10, 2011, 12:00:24 PM »

Whatever it is its annoying, and its wasting precious seconds during autocross since the throttle isn't fully open like it should be

kennysabarese · « **Reply #6 on:** April 10, 2011, 12:14:47 PM »

I am not aware that Lyndon is able to completely fix the delay between the pedal being pushed and the throttle body opening. I have his tunes and there still is a delay. Yes with his tunes you get power sooner, but it is not like having a cable on the throttle body.

elff · « **Reply #7 on:** April 10, 2011, 12:23:45 PM »

Isn't this what the SprintBooster addresses?

[I hope I used the correct name for that part]

kennysabarese · « **Reply #8 on:** April 10, 2011, 12:25:24 PM »

AFAIK sprintbooster just tells the computer that you have pushed the pedal farther than you really have by intercepting the signal sent to the computer. it doesn't change anything inside.

this is the computer deciding to open the throttle later than you've asked it to be opened.

BigSal · « **Reply #9 on:** April 10, 2011, 01:03:32 PM »

Quote from: snaponbob on April 10, 2011, 11:16:14 AM

It's an emissions thing. Same with the lazy throttle off drop in rpm. It turns out that the flywheel IS 29 pounds, so THAT is not why it revs up and down so slowly.

SnapOnBob,

Is 29 lb flywheel light? I was always wondering why the drop in RPMs was taking a bit longer than I thought it should.

Sal

snaponbob · « **Reply #10 on:** April 10, 2011, 01:44:34 PM »

Quote from: BigSal on April 10, 2011, 01:03:32 PM

SnapOnBob,

Is 29 lb flywheel light? I was always wondering why the drop in RPMs was taking a bit longer than I thought it should.

Sal

E-mailed a vendor (forgot who) and asked for the shipping weight, and they responded 29 pounds.

kennysabarese · « **Reply #11 on:** April 10, 2011, 02:10:19 PM »

I think he's asking if 29lbs is considered light in the world of flywheels.

shabby · « **Reply #12 on:** April 10, 2011, 02:29:14 PM »

Quote from: BigSal on April 10, 2011, 01:03:32 PM

I was always wondering why the drop in RPMs was taking a bit longer than I thought it should.

The throttle doesn't abruptly close when you let off, rather it slowly closes and that's why the rpm drop slower.

I tried disabled this with hptuner just now and so far no luck, the throttle does feel a bit different(i did play with cam timing though) but between 50-100% the delay is still intact.

Sol Asylum · « **Reply #13 on:** April 10, 2011, 02:32:53 PM »

The delay may not be a software issue but a hardware one. The servo motor used to drive the throttle plate may just take that long to drive it from closed to open back to closed. It may be time to find a new servo motor.

IBDRINKEN · « **Reply #14 on:** April 10, 2011, 02:50:50 PM »

29 pounds is heavy for a flywheel, a lightweight one weighs approx 13-15 pounds

gmtech16450yz · « **Reply #15 on:** April 10, 2011, 03:11:40 PM »

Quote from: Sol Asylum on April 10, 2011, 02:32:53 PM

The delay may not be a software issue but a hardware one. The servo motor used to drive the throttle plate may just take that long to drive it from closed to open back to closed. It may be time to find a new servo motor.

Nope. Floor it with the engine off and pedal will match tps perfectly.

Critterman · « **Reply #16 on:** April 10, 2011, 04:09:44 PM »

It can be tuned out of the LN5. And i thought Wester's had tuned it out of the LNF?

Graywolf · « **Reply #17 on:** April 10, 2011, 06:01:40 PM »

Well I really haven't noticed it but I suspect it is probably there and I have adapted to this problem. I am using a Fidaza light weight fly and that should help some for quiker response up and down with rpm. Currently thinking of adding some thickness to the accelerator pedal so it is closer to the height of the brake pedal [ when the brake pedal is depressed to braking level] to blip engine rpms for down shifting. This will make heel/toe much easier

Brad Kenny · « **Reply #18 on:** April 10, 2011, 10:05:20 PM »

Not to go off topic by I know DDM was able to tune out the throttle delay in the LE5 (Thanks Critter). Maybe someone might wanna call Lyndon or Dave to see what they think for the LNF? I have over 40000 miles without a throttle delay, makes the car a huge difference to drive. Instant on, but even I still have the slow throttle down due to the flywheel weight. I actually use dynamic braking and enjoy doing it. The higher RPM on slow down supports this along with a smoother upshift due to the drop in RPM being almost perfect for high RPM up-shifts. JMHO. Looking foward to seeing what is found here. Would be a great upgrade for any LNF.

snaponbob · « **Reply #19 on:** April 10, 2011, 10:31:30 PM »

Quote from: Kenny on April 10, 2011, 02:10:19 PM

I think he's asking if 29lbs is considered light in the world of flywheels.

Not so bad for a dual mass flywheel. I have cut single mass flywheels in various cars in the past. No negatives in any of them. BUT, I never cut over HALF of the weight, and the Spec and Fidanza LNF flywheels are 12.5 pounds each. I am sure that the difference will be less subtle.

tazz · « **Reply #20 on:** April 10, 2011, 10:38:52 PM »

Chris over at HPT is working on a few more tables so within a week there might be some more to play with.
http://www.hptuners.com/forum/showthread.php?p=251914#post251914

kennysabarese · « **Reply #21 on:** April 11, 2011, 06:47:19 AM »

Awesome!!!

kennysabarese · « **Reply #22 on:** April 12, 2011, 07:48:47 AM »

I just talked to BYT (not BTF) from HPT and Cobalt forums and he has figured out how to get nearly 1:1 throttle by tweaking some tables, but it doesn't fix the delay on sudden accelerator pedal push.

not sure if the new new parameters will help or not.

POS VETT · « **Reply #23 on:** April 12, 2011, 09:12:05 AM »

There is this thing called "torque management" in LSx PCM programming. Is it the same thing as the throttle delay talked about here ?

Critterman · « **Reply #24 on:** April 12, 2011, 09:14:07 AM »

I believe that is where it was tunned out of the LN5

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Author Topic: Throttle Delay - Has anyone been able to tune it out? (Read 19268 times)