Move from 16 inch to 18 inch rim

[cytien]

I just change to 18 inch from original 16 inch rim..
After change, felt that the car a bit sluggish ..
Izzit just my illusion or really one?

 

[Waiora_ProTuner]

real..

 

[stupidcar]

I just change to 18 inch from original 16 inch rim..
After change, felt that the car a bit sluggish ..
Izzit just my illusion or really one?

real..

 

[stutzedward]

I cudnt feel much difference when I upgraded mine. Only more bumpy and harsh. Power and response feels the same for me. What tire size u use?

 

[vr2turbo]

I just change to 18 inch from original 16 inch rim..
After change, felt that the car a bit sluggish ..
Izzit just my illusion or really one?

Tyre size conversion correct?

 

[cytien]

change from original 16 inch 215/60 to 18 inch 225/40..
from internet, about -4% diff.

 

[stutzedward]

Sud be okay. Don't think that it will effect the performance much. Is the rim a lot heavier?

By the way, I've used 40 series before, it's a bit thin for Airtreks for my likings. I am now using 45 series which is better in terms of look (less empty gap within wheel arch) and rides more comfortably too. :)

 

[cytien]

i bought light rim.. around 8.4kg .. not sure how heavy is the original rim..
maybe 18inch tyre a lot heavier?

i tried vw 200hp with 18inch before, smooth... tot it will be same as my 240hp potato...
mana tau ... diff feel ...
haih..

maybe should get 17inch ... hahaha

 

[stutzedward]

The tire won't be a lot heavier I am sure. The thinner tire wall will compensate the width. I doubt 17" will make a lot of difference. Try to drive it as it sud be, maybe the 'sluggishness' will not be felt. Or maybe you're just comparing to the 200hp car in terms of response and performance?

Well, 240hp it's when it was NEW and setup of the engine is perfect with Ron 100 fuel in Japan with cold weather. After around 10 years old, I bet you'll loose some power if everything is still stock (not even increased boost). At most, I would think you have around 210hp in the crank. At the wheels, maybe 150-170whp the most.

As I mentioned a few times in my other thread, Airtrek is heavy. It's over 1600kgs. If your 200hp car is just 1100kgs, that's 500kgs more to pull with just 10hp extra (200hp vs 210hp). In fact it will be SLOWER.

What I am trying to tell is that, there's a lot of different cause to the performance of the car. Can't just compare like that. By the way, what is the 200hp car you tested? Manual transmission? Airtrek INVECS II is hopeless and whp eater.

PS: And that's why we modify our cars, hahaha...

 

[cytien]

it's vw golf gti mk5...

 

[stutzedward]

Stock non-modified MK5 is around 180-190whp. I am sure it's much lighter than Airtrek.
Stock non-modified Airtrek is around 160whp and heavier too. So it makes sense why.

Additionally, the DSG is a lot more efficient compared to our slow-box. Best Motoring Keiichi tested GTi MK6 manual vs. DSG. DSG was faster!

 

[cytien]

ohhh .... but actually my main comparison is when my car with 16 inch wheel with current 18 inch..
hmmm... maybe its my illusion ...

will try few more days...

 

[6UE5t]

change from original 16 inch 215/60 to 18 inch 225/40..
from internet, about -4% diff.

i bought light rim.. around 8.4kg .. not sure how heavy is the original rim..
maybe 18inch tyre a lot heavier?

i tried vw 200hp with 18inch before, smooth... tot it will be same as my 240hp potato...
mana tau ... diff feel ...
haih..

maybe should get 17inch ... hahaha

Hmm this is a bit odd. Usually std rims are heavy, for 16' can be as much as 9-10kg. So if your 18' is only 8.4kg then it should be good enough already. More over your 18' tire size is a lot smaller in diameter than the std so, it should make it even responsive as opposed to sluggish. Maybe it's your tire compound which is much more grippy than the older 16'. What tire are you using now for the 18' and what was the previous tire?

 

[vr2turbo]

Hmm this is a bit odd. Usually std rims are heavy, for 16' can be as much as 9-10kg. So if your 18' is only 8.4kg then it should be good enough already. More over your 18' tire size is a lot smaller in diameter than the std so, it should make it even responsive as opposed to sluggish. Maybe it's your tire compound which is much more grippy than the older 16'. What tire are you using now for the 18' and what was the previous tire?

Bro. 6UE5t must read back a bit....haha
He mentioned 215/60R16 to 225/40R18

---------- Post added at 04:28 PM ---------- 6 hour anti-bump limit - Previous post was at 04:26 PM ----------

change from original 16 inch 215/60 to 18 inch 225/40..
from internet, about -4% diff.

-4% should be lighter, not sure why sluggish unless you went too big.
Actually like bro. stutzedward mentioned using 45 series is more accurate size (225/45R18)

 

[6UE5t]

Bro. 6UE5t must read back a bit....haha
He mentioned 215/60R16 to 225/40R18

---------- Post added at 04:28 PM ---------- 6 hour anti-bump limit - Previous post was at 04:26 PM ----------



-4% should be lighter, not sure why sluggish unless you went too big.
Actually like bro. stutzedward mentioned using 45 series is more accurate size (225/45R18)

I did bro. He complained about being sluggish after changing from the 16' to the 18' with the above tire sizes. So like you said, the 18' tire is actually a lot smaller in diameter (more than -4%) so theoritically should be lighter, not more sluggish. His 18' rims is also quite light already at 8.4kg so that should be good as well. So not sure know why he feels it more sluggish, that's why I thought maybe the tire compound is much more grippy than his older 16' tire.

 

[cytien]

Front is contact sport 3... Back is archillies...
Maybe is the archillies... Super heavy
Or 225 profile

 

[stutzedward]

I'm using 225/45R18 Achilles ATR Sports. No problem for me.

 

[vr2turbo]

I did bro. He complained about being sluggish after changing from the 16' to the 18' with the above tire sizes. So like you said, the 18' tire is actually a lot smaller in diameter (more than -4%) so theoritically should be lighter, not more sluggish. His 18' rims is also quite light already at 8.4kg so that should be good as well. So not sure know why he feels it more sluggish, that's why I thought maybe the tire compound is much more grippy than his older 16' tire.

Even compound grippy cannot become sluggish. Probably rolling resistance becomes bad, but sluggish normally is like pick up time and with bigger diameter usually more felt....

 

[4gbanger]

ask him to increase boost.. can he feel sluggish anymore?

 

[stutzedward]

I had similar experience last time. Long story short. I went to this well known tuner to have my timing belt changed. After changing, the car's power dropped pretty significantly. Back then, I knew nothing about Airtrek. So the suggested solution they gave was to install a manual boost controller and increase the boost. So they did. From 0.6 bar to 1.2 bar. Was driving happily for a year before I send to Ah Wah for qoutation on engine mounting change due to vibration.

Once he tested my car, he said the balancer shaft at the bottom of the car where timing belt was driving were not sync correctly. Hence loose of power and vibration during boost kick it. That is the first time I went to Ah Wah. I was thinking if this guy was pulling my legs but a lot of Airtrekers go there. So I let him fix it.

Not only the vibration was gone, the car was so much more powerful after that. That is when I have trust on Ah Wah till today.

If you want to know more detail of my Timing Belt Story, come here : http://www.zerotohundred.com/newfor...trek-turbo-4g63t-timing-belt-replacement.html