Throttle jolt - Elise S2 - LotusTalk

alexwilkins · 07-22-2009, 06:00 AM

Hi everyone.

I have noticed that in 2nd or 3rd gear, when travelling at fairly low revs, once I release the (light) throttle to slow down, there is a slight jolt in the throttle. It feels like you're dropping the clutch in too quick, although the clutch pedal is not depressed...

Is this a normal Elise phenomenon? It doesn't happen in any other car I have ever driven.

Thanks in advance

Alex

fpitas · 07-22-2009, 06:21 AM

Hi Alex,

Do you have the Rover engine? Not many of those ended up over here because of emissions regulations, we got the Toyota drivetrain instead. You might want to try SELOC | Lotus Enthusiasts Club.

spectre · 07-22-2009, 06:57 AM

My 08 s240 does this and actually my 05 elise did this. Both Toyota drivetrain. Pretty much if your coming down in speed usually 2nd gear, around 15 mph to 10 miles an hr. the car will jerk forward and back but only once. It's almost like it needs throttle input so it won't do that. This will only happen if not touching the throttle like your coasting.

Actually my audi s4 did that also.

TimMullen · 07-23-2009, 11:52 AM

Quote:

Originally Posted by alexwilkins

I have noticed that in 2nd or 3rd gear, when traveling at fairly low revs, once I release the (light) throttle to slow down, there is a slight jolt in the throttle. It feels like you're dropping the clutch in too quick, although the clutch pedal is not depressed...

What year is your car? It might be something happening with the Electronic Throttle Control on '06 and newer cars.

It could also be part of the emissions - does the throttle drop or jump up? Some (most?) cars have a system that holds the throttle open a bit above a certain road speed (to prevent excessive emissions that happen at idle), and when the speed drops below that speed, the throttle drops. It's usually not that noticeable, but it's been very obvious on several of my cars...

alexwilkins · 08-19-2009, 05:03 AM

Hi all

It is a 2008 R model, so a Toyota 198bhp engine.

The engine is great fun, and I have no complaints whatsoever, but this "jolt" certainly seems unusual.

It's effectively a jolt "down", as if you released the clutch pedal too quickly after changing down a gear, so it feels like engine braking.

However I'm not changing gear and not touching the clutch pedal, only releasing the throttle and coasting. it's immediately when you start to coast that the "bump" happens.

It happens at low speeds, say between 15-30mph.

Alex

alexwilkins · 08-19-2009, 05:05 AM

fpitas - I did leave a message on the SELOC forum which came highly recommended by another lotus driver I met, but nobody could be bothered to reply...!

I thought I'd try this forum and its seems much more helpful.

07-22-2009, 06:00 AM	#1 (permalink)
alexwilkins Registered User Join Date: Jul 2009 Posts: 4	Throttle jolt - Elise S2 Hi everyone. I have noticed that in 2nd or 3rd gear, when travelling at fairly low revs, once I release the (light) throttle to slow down, there is a slight jolt in the throttle. It feels like you're dropping the clutch in too quick, although the clutch pedal is not depressed... Is this a normal Elise phenomenon? It doesn't happen in any other car I have ever driven. Thanks in advance Alex

07-22-2009, 06:21 AM	#2 (permalink)
fpitas User, Registered Join Date: Sep 2005 Location: Leesburg, VA Posts: 1,827	Hi Alex, Do you have the Rover engine? Not many of those ended up over here because of emissions regulations, we got the Toyota drivetrain instead. You might want to try SELOC \| Lotus Enthusiasts Club. __________________ Francis 2006 Chrome Orange Elise: LSD/TC, Nitron SAs with 425/650 springs, BWR 7/8" Front Bar, Eliseparts bumpsteer kit, VF Stage 2, 2bular Header + Sport Cat + 8x24 GT3 Muffler, ECU Tune by Jermaine, Smaay's fuel rail, ACT XT clutch, Saikou Michi dual catch can, Moroso pan, Manly's mount inserts & FF Engine Damper 2000 Black Integra Type R: - 213,000 miles...running again!

07-22-2009, 06:57 AM	#3 (permalink)
spectre the designer Join Date: Nov 2005 Location: Ohio Posts: 767	My 08 s240 does this and actually my 05 elise did this. Both Toyota drivetrain. Pretty much if your coming down in speed usually 2nd gear, around 15 mph to 10 miles an hr. the car will jerk forward and back but only once. It's almost like it needs throttle input so it won't do that. This will only happen if not touching the throttle like your coasting. Actually my audi s4 did that also. __________________ 2008 Exige S 240 For Sale: 2005 stock shifter console and change holder. PM if your interested.

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08-19-2009, 05:03 AM	#5 (permalink)
alexwilkins Registered User Join Date: Jul 2009 Posts: 4	Hi all It is a 2008 R model, so a Toyota 198bhp engine. The engine is great fun, and I have no complaints whatsoever, but this "jolt" certainly seems unusual. It's effectively a jolt "down", as if you released the clutch pedal too quickly after changing down a gear, so it feels like engine braking. However I'm not changing gear and not touching the clutch pedal, only releasing the throttle and coasting. it's immediately when you start to coast that the "bump" happens. It happens at low speeds, say between 15-30mph. Alex

08-19-2009, 05:05 AM	#6 (permalink)
alexwilkins Registered User Join Date: Jul 2009 Posts: 4	fpitas - I did leave a message on the SELOC forum which came highly recommended by another lotus driver I met, but nobody could be bothered to reply...! I thought I'd try this forum and its seems much more helpful.

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