How much kangaroo jumping is okay?

JordanSuth

Active Member
Messages
94
Hi all,

This is something that has been annoying me recently mainly because I've been doing a lot of town driving.

The problem I have is the car is a little jerky/jumpy at lower speeds in lower gears, 10/20/30mph, 1st and 2nd mostly. Also on and off the throttle the car can be jerky and jumpy.

I know the characteristics of the car can cause this. Lighter flywheel from factory etc but how much of this is normal?

I would interested to hear your responses on how you feel your car is.

FYI - I had my ICAV changed about half a year ago because it was rev hunting. I'm wondering if its worth checking the TPS but I'm interested go hear what other people experience in their cars.






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Vteccin_teg

Advanced Member
Messages
153
JordanSuth said:
Hi all,

This is something that has been annoying me recently mainly because I've been doing a lot of town driving.

The problem I have is the car is a little jerky/jumpy at lower speeds in lower gears, 10/20/30mph, 1st and 2nd mostly. Also on and off the throttle the car can be jerky and jumpy.

I know the characteristics of the car can cause this. Lighter flywheel from factory etc but how much of this is normal?

I would interested to hear your responses on how you feel your car is.

FYI - I had my ICAV changed about half a year ago because it was rev hunting. I'm wondering if its worth checking the TPS but I'm interested go hear what other people experience in their cars.






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I get this quite badly, once engine is hot and I've been driving a while jts not too bad. Mainly happens over speed bumps, so now I just don't touch throttle or brake as I'm going over them, helps alot tbf.

Alot of people say changing the TPS to an acuity Hall effect 1 helps alot. Ive got 1 sat upstairs just havnt had chance to fit it yet.

Soon as I do. Prob be July time, then I'll let you know how I get on.



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JordanSuth

Active Member
Messages
94
Vteccin_teg said:
I get this quite badly, once engine is hot and I've been driving a while jts not too bad. Mainly happens over speed bumps, so now I just don't touch throttle or brake as I'm going over them, helps alot tbf.

Alot of people say changing the TPS to an acuity Hall effect 1 helps alot. Ive got 1 sat upstairs just havnt had chance to fit it yet.

Soon as I do. Prob be July time, then I'll let you know how I get on.



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Yeah it's definitely never as bad once it's warmed up but it never properly warms up around town. I've had to adjust my driving habits too so it's manageable.

Yes that would handy to know if it helps or not.

I was hoping to get more responses tbh to see what the general consensus is from owners.

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Vteccin_teg

Advanced Member
Messages
153
There is a few posts already on here about it. Although I find the search function pretty redundant sometimes.
Just search for TPS issues or jerking and you'll see some other responses

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20Drift

Members
Staff member
Messages
243
Mine does this as well.

A couple of people have said once mapped they're a lot better, which would probably mean the TPS change would help. I've just got used to it although it's pretty annoying when you're in a rush, you live in speed bump central like me and the car's cold!
 

ATC

Active Member
Messages
86
Can't say I've ever noticed much tbh...

I guess a very small amount in 1st when it's cold, but it's more of a single "jump" as the IAC system takes over rather than multiple kangarooing actions
 

skengdR

Advanced Member
Messages
286
had this before i got remapped the first time . havent noticed it since

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JordanSuth

Active Member
Messages
94
It sounds like most of you experience the same issue as me. I only get a single jump too and it's mostly when taking the foot off the throttle to slow down for a speed bump. It makes sense that the jump is when the IVAC takes over.

I'm sure most sports oriented cars have similar quirks but the Integra is my first so I was just trying to gauge how much is normal but sounds like it's more the characteristic of the car than a problem.

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ATC

Active Member
Messages
86
JordanSuth said:
I'm sure most sports oriented cars have similar quirks but the Integra is my first so I was just trying to gauge how much is normal but sounds like it's more the characteristic of the car than a problem.

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Yeh, seems normal to me - had it in other cars too - the shorter the first gear (and these cars are very short) the worse the issue... which makes sense really - the revs drop so fast when decelerating that it's quite a job for the IAC to "catch" it and prevent the stall without some change in torque, coupled with the magnification of any lack of smoothness with a very short first gear and it's almost unavoidable.

If it bugs you, I find leaving a trailing throttle until just above idle speed cures it, or alternatively just dip the clutch and re-engage, that way you don't notice the "jump" in engine torque through a vehicle acceleration
 

JordanSuth

Active Member
Messages
94
ATC said:
Yeh, seems normal to me - had it in other cars too - the shorter the first gear (and these cars are very short) the worse the issue... which makes sense really - the revs drop so fast when decelerating that it's quite a job for the IAC to "catch" it and prevent the stall without some change in torque, coupled with the magnification of any lack of smoothness with a very short first gear and it's almost unavoidable.

If it bugs you, I find leaving a trailing throttle until just above idle speed cures it, or alternatively just dip the clutch and re-engage, that way you don't notice the "jump" in engine torque through a vehicle acceleration
That's makes sense. I find you always need to sacrifice one thing for another when building these sorts of cars. I will take the excellent gear ratios on the car over a little jumping.

I've learned to adapt my driving by using the clutch. I suppose lockdown has given me too much time to think about the car [emoji23]

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