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Old 22nd January 2015, 14:01   #1
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Default Remapping the Polo 1.5 TDI - Why buy a GT?

Hello!

The earlier 1.2 diesel in the Polo was definitely inadequate.

The new Polo comes with a 1.5 litre TDI engine and is rated at around 89bhp and 230NM. The new Polo GT also comes with a 1.5 litre TDI powerplant rated at 105bhp and 250NM. I'm guessing the same engine is used in the Vento too. Essentially then, VW is running the same 1.5 litre unit in different states of tune in all of these cars. Aren't they running these in the Rapids, too? :P

In theory then, given that Polo GTs have been successfully remapped to deliver approximately 130BHP and over 310NM of torque - a new standard 1.5 TDI Polo, remapped, should then be able to reach comparable and similar levels of performance?

If so, wouldn't it make sense to buy a regular 1.5 TDI Polo, used or new, remap it, and enjoy sub-9-second-0-100 levels of performance? Would it not be considerably cheaper?

And if that's the case, why would anyone buy a GT, now?

Of course, I only speak for the diesel-heads, if you will - those of us who value the torque responsible for pinning you to your seat, at the cost of longer rev ranges and refinement. :P

Also, can some of those with remapping experience please shed some light? Can this be done with those results reliably?
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Old 22nd January 2015, 15:00   #2
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Default re: Remapping the Polo 1.5 TDI - Why buy a GT?

Quote:
Originally Posted by torqueaddict13 View Post
And if that's the case, why would anyone buy a GT, now?
Touché! We were discussing about this the other day.

IYAM, the best option right now is to get the Polo 1.5 Comfortline which comes with ABS (the Trendline doesn’t have ABS) and remap it. Spend the rest on other modifications - alloys, tires, multi-function steering wheel, better HU, front grill, wraps, arm-rest, the works.

Someone who’s looking to buy the new GT and isn’t worried about the warranty aspects, should consider this option IMO.
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Old 22nd January 2015, 15:32   #3
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Default re: Remapping the Polo 1.5 TDI - Why buy a GT?

Before anyone plans to remap the 90 BHP one, please verify whether the part number of the high pressure diesel pump is the same for both normal Polo and GT polo. This pump regulates the rail pressure. So if the part number is different for the models then there is a very good chance that the pump is designed for high pressure required for the 105 BHP.

In which case remapping a 90 BHP Polo would mean pushing the pump to the operate at its upper limit constantly. As is VW diesel do not like Indian diesel.

If same part number then voila, Jackpot
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Old 22nd January 2015, 15:45   #4
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Default re: Remapping the Polo 1.5 TDI - Why buy a GT?

Related thread regarding the same engines in different tunes in the various VAG cars.

http://www.team-bhp.com/forum/indian...ions-goes.html (And the Award for the 'Car with most engines & transmissions' goes to....)
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Old 22nd January 2015, 16:04   #5
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Default Re: Remapping the Polo 1.5 TDI - Why buy a GT?

Other than the warranty, nope, there's no other reason.

However, you'd need to be a brave heart to let go of a warranty on a brand new VW. Whether the remap causes issues or not, fact is, things do go wrong with some Polos. Parts aren't exactly cheap either.

How much is the premium for a GT TDI? 50,000 IIRC? How much is that in EMI terms anyway.

And if you don't care about warranty, why not buy a real Polo GT TDI. That is, a 1.6 TDI in the used market . That car was wild, the new one is too tame in comparison.
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Old 23rd January 2015, 09:49   #6
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Default Re: Remapping the Polo 1.5 TDI - Why buy a GT?

Whether one buys the new Polo 1.5 (89bhp, 230nm), or the new 1.5 GT (103bhp, 250nm) or the old 1.6 GT (105bhp, 250nm), the ease with which all of these engines can be remapped to produce 130bhp, 310+nm (without the necessity of any other mods at all) makes remapping extremely tempting, and in the mind of a torque junkie like me, absolutely essential. Which means warranty’s going out the window anyway.
The only way to keep a warranty intact is to leave the car bone stock, not something that most of us enthusiasts are prepared to do :P
Several other Team-BHPians have successfully remapped their VWs and Skodas and seem to be quite happy in terms of reliability and performance – no complains so far, at least, right?
@GTO – You said the real GT TDI is the old 1.6 – while I see the reference, is the extra 100cm3 of that much significance? I mean, remap the 1.5 and the 1.6 to their maximum but reliable outputs, will we see a lot of difference?
Also, getting a good well used 1.6 GT TDI in the used market might be a little difficult, no? They’re either too old or have been driven brutally hard in technically incorrect manners – figuring out potential problems with that kind of a car is a tough task, and when those problems do come to bite later, without a warranty, you could get quite toasted.
Buying a new 1.5 TDI, or even a sparingly used one when it hits the market a few months from now might be a better option if you’re willing to forego the tiny bit of extra performance that the additional 100cm3 in the 1.6 TDI gives you, no? For the benefits of reliability, peace of mind, and general new-ness? :P
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Old 23rd January 2015, 10:28   #7
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Default Re: Remapping the Polo 1.5 TDI - Why buy a GT?

^^ Hey torqueaddict13, I am sure GTO will have a far more expert & technical information to input for your doubts, but here are some of my thoughts:

- I have driven the 1.5 GT TDi and it is QUICK but not BRUTAL like 1.6 GT TDi. Just to give you a sense of comparison, the first Gen Swift VDI vs the Swift ZDI or Verna 1.5 VGT vs Fluidic 1.6 CRDi.

- Recently I drove the Renault Duster 110 PS (AWD) that my neighbor picked up. Though it is not a comparison, I felt how much more powerful & vigorous by GT TDI was, though it is about 5 bhp less with identical torque. Yes Power to weight ratio matters a lot, but I am only referring to the feel of the drive.

Quote:
Originally Posted by GTO View Post

And if you don't care about warranty, why not buy a real Polo GT TDI. That is, a 1.6 TDI in the used market . That car was wild, the new one is too tame in comparison.
I also have a question to GTO here. Have VW Changed/Altered the Turbo on the 1.5 TDI engines compared to the old 1.6 TDI ? Why does the old GT TDI have so much more thrust compared to the 1.5 GT TDI, when the power & torque output are identical ?

Last edited by Vik0728 : 23rd January 2015 at 10:33.
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Old 23rd January 2015, 15:03   #8
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Default Re: Remapping the Polo 1.5 TDI - Why buy a GT?

Quote:
Originally Posted by torqueaddict13 View Post
@GTO – You said the real GT TDI is the old 1.6 – while I see the reference, is the extra 100cm3 of that much significance? I mean, remap the 1.5 and the 1.6 to their maximum but reliable outputs, will we see a lot of difference?
Specs on paper are one thing, how the car feels is entirely another.

The 1.6 GT TDI had explosive power delivery. That surge is just too addictive. The 1.5 GT TDI's way of transferring power to the wheels is far tamer in comparison.

Drive them both back to back and tell me which one made you . There is no comparison.
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Old 23rd January 2015, 20:56   #9
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Default

Hello there! Nice and interesting thread. I haven't sat in the 1.5 TDI car yet but I have a 1.6 Vento TDI. Yep, this 1.6 absolutely rocks in every way. In gear acceleration, high speed acceleration, high speed cruising is not a problem at all. It revs upto 5000 rpm without any drama. It easily eats most of the diesels class above it. If it performs like this in the Vento, it would be an atom bomb in the Polo

Quote:
Originally Posted by torqueaddict13 View Post
You said the real GT TDI is the old 1.6 – while I see the reference, is the extra 100cm3 of that much significance? I mean, remap the 1.5 and the 1.6 to their maximum but reliable outputs, will we see a lot of difference?
Also, getting a good well used 1.6 GT TDI in the used market might be a little difficult, no? They’re either too old or have been driven brutally hard in technically incorrect manners – figuring out potential problems with that kind of a car is a tough task, and when those problems do come to bite later, without a warranty, you could get quite toasted.
Buying a new 1.5 TDI, or even a sparingly used one when it hits the market a few months from now might be a better option if you’re willing to forego the tiny bit of extra performance that the additional 100cm3 in the 1.6 TDI gives you, no? For the benefits of reliability, peace of mind, and general new-ness?
Dear torqueking, we all know that there is no replacement for displacement. So your question was buying a 1.6 GT TDI could be brutally driven et all? All the 1.6 TDI owners love to drive this thing fast but trust me, this engine is completely niggle free! There are many complaints about VW's inconsistent service but the engine is a gem and I don't remember anyone complaining about it. My vento is nearing 47,000kms in under 2 years and still there hasn't been a single issue. Infact it feels better and better after each service. And yea, high rpm pulls are done every weekend unintentionally :P

Last edited by 300 KMPH : 23rd January 2015 at 20:59.
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