1.4 engine tuning

silva^9n · Post by **silva^9n** » Mon Nov 29, 2004 7:03 pm

i have the 1.4 75bhp engine, and i was wondering what is the diffrence between the 75bhp and FSI 86 bhp technically? is it just a diffrence in the ECU (chip) , i know that the FSI 100 bhp has a lower compression than the 86bhp
ok, so what do i need to do to change my 75bhp to a 86 bhp?...is it just the chip
thanks

logistix · Post by **logistix** » Mon Nov 29, 2004 7:13 pm

FSI is a whole different engine, not just the chip. you can look for chip applications for your specific engine but no more than 10bhp will be gained...
try http://www.superchips.co.uk

silva^9n · Post by **silva^9n** » Mon Nov 29, 2004 7:20 pm

is tha 86bhp fsi a whole new engine? why whould VW desighn a whole new engine for a 11 bhp increase...and according to the specs the 86 bhp uses the same compression...
but maybe somone knows more....?

SiDaBa · Post by **SiDaBa** » Mon Nov 29, 2004 7:22 pm

Whole different technology.

I await Nelson_Wilbury (or another FSI owner with the know how) to explain.

logistix · Post by **logistix** » Mon Nov 29, 2004 7:47 pm

The FSI technology was developed by Audi for Le Mans, where fuel tactics dictate the result of the races. FSI engines were designed to be more efficient, meaning less fuel for more energy output, which would improve the timings of Audi race cars.
Later on VW group adapted this technology to various models. An FSI owner would describe the benefits better, but its not just an 11 bhp increase, its a new technology. it provides the power of petrol engines with the efficiency of diesels

please correct me if i'm wrong about any of this

cheers

david burton · Post by **david burton** » Mon Nov 29, 2004 8:07 pm

aye - it's like the technology they use for common rail diesel engines - putting the fuel directly into the combustion chamber under pressure rather than through injectors or carbs. you can control it lots more - and also something to do with the spray pattern - so it's more efficient.

that technology made diesels a whole lot better - and the FSI engines are a good deal more efficient and have more torque than their standard injector siblings.

i think it's cleaner too - for the green people.

sylonien · Post by **sylonien** » Mon Nov 29, 2004 8:21 pm

So what actually determines the normal petrol engines from its power then? I always wanted to know this. 'cos I mean there's like a couple of different 1.4 litres but some are 75BHP and the other is 100BHP?

What have they done to the engine then? Surely the engines must be fairly identical - since this ain't the FSI version I'm talking about.

logistix · Post by **logistix** » Mon Nov 29, 2004 8:29 pm

it's a common mistake to associate the power of an engine with its displacement volume. take the new mazda rx8, the 1.3 engine pumps out 238 bhp

(but it doesn't use traditional pistons and cylinders, well anyway you see the point

)

SiDaBa · Post by **SiDaBa** » Mon Nov 29, 2004 8:35 pm

As sylonien was saying there are several 1.4 engines.

1.4 - 75
1.4 FSI - 86
1.4 - 100

Where does the 100 come from in the last one?

logistix · Post by **logistix** » Mon Nov 29, 2004 8:51 pm

as far as i know, the camshaft and other bits are different in the 100hp engine

silva^9n · Post by **silva^9n** » Mon Nov 29, 2004 9:24 pm

dave burton, so if i understand corectly its a sort of an indirect injection system? which is used on some systems...since as u said its using no injectors nor carbs, if so the FSI guys would not need to do too much remapping to the ecu

GaryUK · Post by **GaryUK** » Mon Nov 29, 2004 9:42 pm

The fsi sounds like a diesel on start up.

Quietens down after that tho, its a funny little bugger.

david burton · Post by **david burton** » Mon Nov 29, 2004 9:54 pm

i'm not 100% sure but it is direct injection at a pretty high pressure.... i don't think standard injectors are direct in the same way.

i bet you will find a few differences between the 100bhp and 75bhp engines.... cam shafts (are both of them double overheads?), timing, mapping etc... even different internals, but I don't know the 75bhp engine very well.

sylonien · Post by **sylonien** » Mon Nov 29, 2004 10:00 pm

Hmm that's what I wanna know - make it go as fast as the 100bHP!

carmadaaron · Post by **carmadaaron** » Mon Nov 29, 2004 10:01 pm

sylonien wrote:Hmm that's what I wanna know - make it go as fast as the 100bHP!

there are chips out that boost the 75bhp higher btw....