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Technical (156)
 Alfa Romeo forum : Technical (156)
Subject Topic: New Variator In Post ReplyPost New Topic
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Baymu
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Posted: 27 October 2004 at 20:19 | IP Logged Quote Baymu

Right,

Just had the variator and all the belts etc done.

Diesel noise is now a distant memory, but there is still the 'turbo lag' sensation as the revs build to 3k.

Should I do an ecu reset?

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jeff_porter
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Posted: 27 October 2004 at 21:58 | IP Logged Quote jeff_porter

just curious, what car do u have?
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TPIACE
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Posted: 28 October 2004 at 03:20 | IP Logged Quote TPIACE

my car does the same Baymu now after a drivebelt/tensioner change and new thermostate/ECU recalibration, sometimes u can pick a percentage of throttle where as u approach 3k u actually feel the power step increase

i brought it up with my dealer after mentioning it here, and he said thats how the TS is spose to feel. Prior to this my car was running very rich at low rpm (300kms to a full tank!!!) so i didnt notice it as much

u can clean up the torque curve with a unichip or remap
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brid_dave
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Posted: 28 October 2004 at 07:04 | IP Logged Quote brid_dave

i do believe the turbo lag effect is caused because of the variator (reguardless of age)
the variator adjusts the timing making the car a more placid vehicle under 3K revs

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TPIACE
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Posted: 28 October 2004 at 09:54 | IP Logged Quote TPIACE

there is a huge misconception that a faulty variator loses hp. This was another issue i brought up with my dealer. He told me he's driven Twin Sparks with very loud variators and theyve felt exactly like any other TS of similar age. The extra power or quicker response owners are feeling after replacing the variator is in fact due to the new cambelt and re-adjusted timing.

Edited by TPIACE on 28 October 2004 at 09:55
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Radone
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Posted: 28 October 2004 at 11:12 | IP Logged Quote Radone

I have the same problem (turbo lag). On Monday my variator will be changed and if the "lag effect" persists I'll try to change the MAF too.
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necstandards
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Posted: 28 October 2004 at 11:14 | IP Logged Quote necstandards

Can poor fuel consumption be directly related to a worn variator? Basically will I notice a difference if I replace the variator?
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TPIACE
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Posted: 28 October 2004 at 11:42 | IP Logged Quote TPIACE

nope there are no side effects to a worn variator other than a rattling diesel noise when the car is on

my high fuel consumption was the result of a dodgy thermostat
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speedywinny
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Posted: 28 October 2004 at 12:47 | IP Logged Quote speedywinny

I've just had a std 36k miles belts replacement (2.0 TS)& commented to the dealer that it has more ooomph now (not that I was disappointed before).

He just muttered about the fact that belts do stretch & it must affect the timing to some small degree. I find this unlikely, but certainly she feels tighter, more responsive & more powerful now.
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CJ Romeo
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Posted: 28 October 2004 at 14:45 | IP Logged Quote CJ Romeo

brid_dave wrote:
i do believe the turbo lag effect is caused because of the variator (reguardless of age)
the variator adjusts the timing making the car a more placid vehicle under 3K revs


This is true.

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lambo75
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Posted: 28 October 2004 at 14:47 | IP Logged Quote lambo75

CJ Romeo wrote:
brid_dave wrote:
i do believe the turbo lag effect is caused because of the variator (reguardless of age)
the variator adjusts the timing making the car a more placid vehicle under 3K revs


This is true.


I was under the impression the variator was there to help improve troque below 3000rpm

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CJ Romeo
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Posted: 28 October 2004 at 15:10 | IP Logged Quote CJ Romeo

No it has 'normal' valve timing at low revs and advances it as the revs increase.

It does it by pumping oil into a chamber that forces a coarse thread out thus altering the relationship between the inlet camshaft and the pulley.

Rover's VVT system is kinda similar in concept but uses a slightly different mechanism.

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