myvi 1.3 first gen cant accelerate above 120 km/h

[Triple Y]

might be spark plug problem

 

[Triple Y]

another question here will it be better for me to change to straight flow exhaust as the power range is like stock? Because i think the swirl bullet n my sflow is holding to much back pressure?

 

[vr2turbo]

110-120km/h, rpm at 4-5k n the car feel a bit heavy at that time. engine oil i think is addinol semi synthetic forget what already

Then I think is GB problem. At 110kph should be like 3k rpm, let bro. Izso confirm since he have Myvi too

 

[6UE5t]

Then I think is GB problem. At 110kph should be like 3k rpm, let bro. Izso confirm since he have Myvi too

If can get the gear ratios, then can calculate what the rpm should be at specific speeds for each gear.

 

[vr2turbo]

If can get the gear ratios, then can calculate what the rpm should be at specific speeds for each gear.

If high revs then not changing up.....

 

[sweelt]

TS driving an auto. Might be gb problem. Final gear not kick in ?

 

[jerrysiow]

110-120km/h, rpm at 4-5k n the car feel a bit heavy at that time. engine oil i think is addinol semi synthetic forget what already

TS, check your overdrive enable or not. Your engine RPM seem very high for 110-120km/h. Myvi auto should be around 3k RPM at 110km/h and 3.5k RPM at 120km/h which is lower than manual myvi.

 

[Izso]

I have same problem.

my 2010 Suzuki SX4 can go past 160km/h, although it takes a while to get to that speed.
last year I change my battery to NS60 equivalent (SX4 use NS70), and suddenly it gets very hard to get past 160km/h.

Is this somewhat related to changing battery? I also change the spark plugs to more expensive one, recommended by mechanic, i dunno the brand of the spark plug.

Battery has nothing to do with it.. mostly. But you need to explain how "difficult" it is to get past 160. There's a lot of reasons for this. It depends.

110-120km/h, rpm at 4-5k n the car feel a bit heavy at that time. engine oil i think is addinol semi synthetic forget what already

Check the weight of the oil la. And it sounds like you have the OD button switched off. Switch it on la. It's the button on the gearknob. That's ridiculously high RPM for that speed leh.

might be spark plug problem

Unlikely. If it was the plugs, you'd have misfiring or jerkiness.

another question here will it be better for me to change to straight flow exhaust as the power range is like stock? Because i think the swirl bullet n my sflow is holding to much back pressure?

Don't touch your exhaust la. I'd remove the bullet though. You don't need so much stuff in the way.

 

[leinnz]

what about the AFR, did he clean the air intake portion? mine was sluggish before and after cleaning the AFR, the car performs as per normal

 

[loose_end]

If car jerk, vibrate, hesitate to rev at 4k at 120km usually due to plugs. If plug done, could be fuel filter or fuel pump.

 

[Triple Y]

must use overdrive ah cant use d to drive up to 120km/h?

 

[Triple Y]

throttle body, air filter cleaned and the car fill slightly better for the moment. since i started this post before i went for major service... will try n see if accelerating to 120km/h will be smoother.. thank you all

 

[Triple Y]

might be spark plug or fuel pump n fuel filter just change. spark plug just change to denso iridium spark plug but feel the throttle pedal slightly heavier..

 

[sweelt]

must use overdrive ah cant use d to drive up to 120km/h?

overdrive very confusing, whatever term for car lah. Button near gear knob.
When OFF overdrive, rpm sure high. Don use always, more load to gearbox. Plan to cut 15 cars, use loh...hahaha
When ON is normal driving rpm according to throttle.

But auto trans, once you step on the throttle it will jump to lower gearing dy.

 

[jerrysiow]

must use overdrive ah cant use d to drive up to 120km/h?

OD or overdrive providing high gear (not gear ratio here) which lower the RPM (engine revolution) with same speed cruising.

 

[^pomen_GTR^]

TS driving an auto. Might be gb problem. Final gear not kick in ?

TS, check your overdrive enable or not. Your engine RPM seem very high for 110-120km/h. Myvi auto should be around 3k RPM at 110km/h and 3.5k RPM at 120km/h which is lower than manual myvi.

or he was driving with OD-OFF all these while

 

[leinnz]

throttle body, air filter cleaned and the car fill slightly better for the moment. since i started this post before i went for major service... will try n see if accelerating to 120km/h will be smoother.. thank you all

please do try. it might be the reason

 

[jerrysiow]

or he was driving with OD-OFF all these while

This is what I suspecting with his description where the engine RPM is quite high for that speed.

 

[vr2turbo]

overdrive very confusing, whatever term for car lah. Button near gear knob.
When ON overdrive, rpm sure high. Don use always, more load to gearbox. Plan to cut 15 cars, use loh...hahaha
When OFF is normal driving rpm according to throttle.

But auto trans, once you step on the throttle it will jump to lower gearing dy.

You got it reversed, Overdrive ON lowers thew rpm.....

 

[sweelt]

You got it reversed, Overdrive ON lowers thew rpm.....

ya lohh...very confusing. hehehe....Thanks