Polo GTi MY07 Chip vs MkIV Golf Gti Engine Internals

[geoffwhere]

Can anyone vouch for the difference (if any) between these two cars' engine internals (and the Audi A3 for that matter, from where the MkIV Golf GTi got it's donk)? I'd like to chip up my Polo and was wondering whether adding the extra KWs to match the Golf output would break anything.

[jasn78]

geoff dont mean to be rude mate but search is your friend esp on this topic. Also I think you will find that the polo has the same output as a mk4 golf as standard

[h100vw]

The AGU mk4 and Polo GTI motors while outwardly similar are a bit different on the inside.

The AGU has the greatest power potential of the 2, the head has larger ports. The rods in the AGU have larger little ends making them a bit tougher.

If you are wondering about just having software for your Polo, you needn't worry about the engine. You would need to fit a bigger (a fair bit bigger) turbo before the engine needs any work.

Gavin

Have a look at this thread.

http://www.vwwatercooled.org.au/newforum/upload/showthread.php?t=33911&highlight=vwindahouse

Anthony is fitting all his hop up gear and the engine is staying in one piece.

[noone]

You run a greater risk of damage, but assuming you drive it reasonably normally, the increase is very minor.

The Polos are somewhat prone to issues, but from what I've read most of the issues are with components wearing out or aging rather than damage as inflicted from the extra power.

The turbo won't last as long as the turbo is where most of the additional power is derived from. Not to worry, if it does somehow break, they are not overly expensive as they have been used in a large number of vehicles.

[h100vw]

The turbo won't last as long as the turbo is where most of the additional power is derived from. Not to worry, if it does somehow break, they are not overly expensive as they have been used in a large number of vehicles.

I haven't heard of a busted turbo on a Polo yet. Have you noone. Not calling you, just not heard of one.

Gavin

[noone]

I haven't heard of a busted turbo on a Polo yet. Have you noone. Not calling you, just not heard of one.

No probs, glad to have someone clarify.
If the Turbo is working harder, it will no doubt have a shortened life. I don't think it would be commonly <100,000kms or anything, but the turbo is doing more work than at Stock.

By all means, I'd rather be put in my place than be passing on incorrect info, feel free to pull me up on it.

[h100vw]

No probs, glad to have someone clarify.
If the Turbo is working harder, it will no doubt have a shortened life. I don't think it would be commonly <100,000kms or anything, but the turbo is doing more work than at Stock.

By all means, I'd rather be put in my place than be passing on incorrect info, feel free to pull me up on it.

Wasn't to put you in your place/

In my opinion these turbos, even when on a chipped car are pretty indestructible. What would kill one is bad/infrequent servicing and lack of mechanical sympathy.

There's plenty with big mileages in Europe and the States. 200000km wouldn't be unusual. I had a 98 Passat wagon with 130000 miles up on the original turbo, it had a full service book as it was a lease car previously.

I don't think you could change the oil too often, you can definitely not do it enough though.

Gavin

[John Deere]

I don't reckon the turbo is working harder.....the turbo pumps a certain amount of air at a certain revolution speed....the engine however gets more of that pumped air injected (rather than blown off) with a chip, so the engine is working harder.

Just my logic.....could be fuzzy!

[noone]

Whilst the engine is dealing with the additional air and each combustion can therefore have more fuel as well (or more often), its the additional air pressure from the turbo which is enabling the additional power.

There is a reason that its not worth chipping most NA cars and this is the reason I bought a turbo. With the chip, the pressure output is cranked up which is still within its efficiency range otherwise it would not be doing the system as a whole any favours.

[seangti]

From my research/reading on here, timing and boost seem to be the parameters that are most fettled with. I'd imagine air/fuel would have to be touched up to keep the exhaust gas temps in check. This has been talked about in the polo section between Guy and a few others (might have been Gavin, can't recall)

But as for the original question - bear in a mind a polo is going to be a few years newer than a mkIV and most likely lower km's. If only comparing KW's between the two, power to weight needs to be taken into account. But are you really aiming to max out the engine??? other bits are likely to let go before that point.

[noone]

From my research/reading on here, timing and boost seem to be the parameters that are most fettled with. I'd imagine air/fuel would have to be touched up to keep the exhaust gas temps in check. This has been talked about in the polo section between Guy and a few others (might have been Gavin, can't recall)

But as for the original question - bear in a mind a polo is going to be a few years newer than a mkIV and most likely lower km's. If only comparing KW's between the two, power to weight needs to be taken into account. But are you really aiming to max out the engine??? other bits are likely to let go before that point.

Fair call. I thought the tuners did not touch the A/F ratios, I think this was one of the areas they can claim their coding is safe as it just relies on normal processing in this area.

I love my Polo, but the car is not as solid. Depends what you are after, a reliable sturdy 5 door or a lighter 3 door...

[Jmac]

The AF most definately has to be doctored or you will have a chance of pinging with too lean a mixture or on the other hand too much fuel and less power, and all good and well changing the AF but it needs to fire right too so really the original MAP gets gets tweaked timing etc. Yes the comment about exhaust temps is right, it must stay below 750 degress or you run a big risk. Higher boost more air, then more fuel. All relevant.
Cheers
Jmac

[Spec83]

The turbo won't last as long as the turbo is where most of the additional power is derived from. Not to worry, if it does somehow break, they are not overly expensive as they have been used in a large number of vehicles.

We have been over this is a pervious thread in the Polo section... When chipped, the turbo is working at a similar efficency 'island' on the compressor curve, just further up it (~68% from memory)... Therefore, the air will not heat up significanly more than a stock boost unit and overspeed the exhaust wheel... Only a tad bit more heat may be generated in the bearings due to incressed compressor speed, but this will not shorten the life of the turbo by any discernable amount