golf gti

[golfiste]

i own a golf 2 gti 16 v and i put a high performance filter on it and a remus exhaust but there is a problem .My engine seems to suffocate i want to say that it is not able like before to reach is top speed which was over 200 kmh .If someone could help me,it would be great

thanks

[TT]

New filter... you mean new filter into the original box or maybe one of those conic ones? because if you just install one of them w/o doing some proper work checking the power curve, it can happen that you loose grunt somewhere...

[golfiste]

in fact it is a conic filter i just put it on the engine what other mods do i have to make?

[TT]

When you put a conic one as far as I know, you have to "tune" the inlet.. trying different lenght untill you find the right one so that the engine still turn "round"... just fitting it, usually always cause some holes somewhere in the revs range...

[golfiste]

in fact i have to tune the injection

[TT]

I was meaning the lenght of the inlect duct from the filter to the engine, but I suppose a good tuner will work also on the ECU and all the rest to have a good package

[golfiste]

i think that the engine produces too much hot air and the filter doesn't like it so how to repare it an idea?

[TT]

The only way IMO is to take the car to a garage where they are using to do that stuff.. to work on the engine or even only on its air filter alone w/o experience it's not really a good idea IMO...

Just to give you an idea.. a friend of mine with a 106 S16, decided to tune it completely alone.. and he is pretty skilled anyway.. he also installed alone the rollbar and all the rest from racing seats, to suspensions.. of course he did also his filter and complete exhaust... well the result is a car that does 100 km with 45 liters... not sure where exactly the problem is.. maybe the thing just need some good cleaning, but IMO the only way to go the "sure" way is to make professional do their business

[frodefe]

When "tuning" modern cars there are allot of things that can go wrong.
- not that you neccesarily destroys something, but instead of improving
the HP/torque, you reduce the overall performance of the car (?)

I your case, maybe a sensor notices the hot air, and corrects the
timing, to prevent pinging/knocking... (or something...) and thereby you
loose some HP..

[Epic2112]

Like others are saying, these things can get more complicated than you might expect. I'm no expert, but here are a couple of possibilities:

1) On both of my cars the air for the air intake comes in from outside of the engine bay via a pipe or duct. This ensures that the air coming in is cold (compared to the air under the hood), and the opening to the outside is also in a high pressure area (when the car is moving) so more air is pushed in. If you have a closed airbox like the ones on my cars, by replacing it with a cone you eliminate the high pressure source, and also suck in hot air from the engine bay, often from right behind the radiator and/or intercooler. Even if the cone filter itself can let more air pass through it (which is highly debated, and the reason both of my cars have stock intakes) it may be less effective because it's no longer in a high pressure area, and because you are sucking in hot air.

2) Most modern cars are designed to work with some exhaust back pressure. You didn't say if you've eliminated the catalytic converter or not, which would significantly reduce backpressure, as does replacing the exhaust with an aftermarket one. Often with naturally aspirated cars there is actually a slight decrease in performance if all you do is reduce or eliminate backpressure to an otherwise stock engine (this is also highly debated, FWIW). This is not the case with turbocharged cars, however, where the elimination of backpressure should (theoretically) reduce turbo spool up time and as such the benefits outweigh the shortcomings. I'm not sure if your car is turbocharged, but I think it is.

HTH

[zevolv]

On our Golf (Look at my sig) anew filter really helped reduce some of the turbo lag produced when a new turbo was installed and with a proper exhaust you get a really even powerband

[zevolv]

New fuel injectors might be able to solve the fuel mixture problems if not reprogramming your ECU. He should check out neuspeed they have evreything you'll need for a Golf. New cams might even help out a bit. I dont know too much about the older golfs just the new one.

[ravenpaua]

I have also a Mk2 Golf GTI, and I think that there isn't any lambda making the fuel mix.

[Ottar L]

Ehh, the old golf gti have mechanic k-jetronic injection. You cant just throw away the org.filter thing.
Where did you put the cone filter?

[bullet_1800]

Originally Posted by Ottar L Ehh, the old golf gti have mechanic k-jetronic injection. You cant just throw away the org.filter thing. Where did you put the cone filter?

Thank god someone know his shi..... The mark 2 Golf gti consists from a 1.8 16v fuel injection system. It gives out 139hp and that's about it. It hasn't got an electronic fueling program but as Ottar very well said K-Jetronic which is mechanical injection. That means that the uel distribution never stops and that is why the engine is that much fuel consuming,because even if you lift your foot of the accelerator this thing will keep on feeding with the same ammount. Thus all that wiring on the original intake manifold. The question that i would really like you to answer is what did you do with original filter box?????

The best thing to do is to get rid of the cone filter and go buy one that fits in the standard box. Then try to find a plastic cap on the left side of the filter box and remove it so you can increase the air pressure coming in and so having greater ammounts of fresh air going in. An even greater modification for that is to make some grills on your right front wing like the rallye has so you can get even more air. This grills can be found on www.tmtuning.com


I hope i was some help and good luck.