Polo 9N3 wheel question

[kaanage]

Sorry, I was wondering if you would sell the wheels and tyres that are on the Polo soonish after picking up the car (after you've switched to the Bora wheels)?

[FarQ]

Sorry, I was wondering if you would sell the wheels and tyres that are on the Polo soonish after picking up the car (after you've switched to the Bora wheels)?

Oh ok. I'll have to see how much tread is on the tyres, cos i was going to wear down the tyres and replace wheels when i needed new tyres. Also the wheels are steel oem with covers.

[Buller_Scott]

I already have the 16" Bora rims, my wife wont let me spend more money... lol. Since she already knows that i will be chipping the TDI . Do TDI's benefit from exhaust mods like petrol turbos?

the rule of thumb is that any type of engine likes to breathe, and that theoretically, so should our diesels.

this rule DOES NOT apply to our polos.

intake is all good- getting something like a seat pd160 intake, or even a modshack set up like cogdoc's (greg roles, on this forum) will help things for sure.

but as for exhaust, there is plenty of doco on tdiclub that allude to a few things:

1. mufflerectomy is good for the weight saving, that's all.
2. you're going to experience no power gains with a bigger dump pipe on a CHIPPED car.
3. because of our vnt15 / borg warner bv39 turbos being so small and pushing things with stock hardware + remap, all a bigger dump pipe is going to do is allow your turbo to spike more easily (bad)
4. boost creep apparently already takes place with the stock hardware (when chipped). it just gets worse with a bigger dump pipe. there are threads on tdi club of guys blowing two stock turbos in half a year, all because of increased fuelling and boost + bigger dp
5. i've toyed with the idea of getting de-catted, but i've also read enough literature to suggest that for an eighth of a horspower gain, a decat will also invite boost creep.

so yeah. im not willing to confirm nor rebutt any feedback to this post. anyone else who has spent hundreds of hours on tdi club specifically looking for performance and maintenance info on the 1.9 tdi w/ vnt15 / kp39 / bv39 turbo'd engine, can give you their opinions.

bottom line... if it was doable, i would have done it already. i've done subtle intake mod. i've done mufflerectomy. i would have done de-cat/ bigger dp for sure- the polo gtis are getting awesome gains from dp alone.

me? according to the freaks on tdiclub who really, really, really, really, really, really, really, really, really know their isht, a remap + downpipe / decat, driven aggressively, and i would have already blown my turbo by now. probably a couple of them.

[instigator]

exhaust gains are more hopefull on a n/a engine, still depends from brand and car etc.
so it's not allways the case, but most of the times it is.
i do know that on a stock polo GTI, it won't make that much diffrence...

my GTI had 161Hp & 250nm, 100% stock on the dyno.
2 years later, in the same month and quite the same temp. i did another run.
also now i had a full non resonated milltek exhaust and a k&n 57i filter on it.
it made 167.7hp and 255nm.
but once you get a remap done it will make more diffrence.

for a diesel engine, don't know if it is bad or not, not a diesel guy
but it helps, a friend tuned his 2.2 TDCi mondeo with 155 stock to 210hp with remap airfilter and exhaust.

[Julian Edgar]

I did the intake, then new rear muffler, then remap (all on Skoda Roomster 1.9 tdi). At each stage I measured the actual on-road acceleration of the car.

The new intake, that reduced presure drop by a massive amount (ie improved flow), made the car slower.
The new rear muffler made the car slower.

I'd love to see any evidence that doing these two mods, without a reflash, improved the performance of any 1.9 Tdi PD.

With the custom reflash the car responded very strongly - probably more strongly than it would have, had the intake and muffler not been done.

Moral of the story: don't believe what people say when they haven't measured anything!

[Evaded Motorsport]

Will have some updated times hopefully this weekend. Not ideal comparison but the last 16.1 was done with out the de-cat being performed. Conditions will be different but it gives some indication.

Butt dyno suggests it is faster, running it against another persons car that would previously pull in third gear, the results have turned, the polo now pulls on that car in thrid gear.

I have run the car for 2 months now (10,000km) with no issues, that may change in the future which isn't really a worry as the basic idea is to go a K3 (18/56) anyway.

[instigator]

and even if you get it dyno tested... won't say anything.
if you want to know improvement you need to get it on the same dyno as before.

i have seen people that had XXXhp on one dyno and about 30 - 60hp less/more on another, to much diffrence between them all.
wich one is correct? you could never tell

[Evaded Motorsport]

and even if you get it dyno tested... won't say anything.
if you want to know improvement you need to get it on the same dyno as before.

i have seen people that had XXXhp on one dyno and about 30 - 60hp less/more on another, to much diffrence between them all.
wich one is correct? you could never tell

Even that isn't fool proof to an extent.

I am happy doing it off 1/4 mile times, At the very least you can gain some insight as to an actual performance gain.

[FarQ]

Just checked the tyre placard on the Polo TDI and it has listed 185/60R14, 195/55R15 & 205/45R16 (OD:590mm). I would've thought that 195/50R15 (OD:577mm) & 195/45R16 (OD:582mm) would be a more exact rolling diameter upgrade from 185/60R14 (OD:578mm)??

[kaanage]

Yeah, I saw that on the inside of my fuel flap too and thought it was odd sizing. That's why I thought I'd ask what you actually had fitted on yours.

[instigator]

Even that isn't fool proof to an extent.

I am happy doing it off 1/4 mile times, At the very least you can gain some insight as to an actual performance gain.

my reaction was on the previous post, not yours
sorry for not quoting correctly.

but i see what you mean, makes sense...