turbo chargering 2.0l how do i lower the comperssion???

[91redjetta]

i have a obd 1 2.0l i want to throw some boost at it.. either turbo or m45 blower? how can i use something vw..( i don't want to buy really expensive aftermarket pistons!!) to make the compression like 8.5:1 or 9:1 something lower then 10:1.. i'm going to throw a regular 8v head on it i think if that helps... thanks again

[SteveXs2]

I don't know much about this area, but I have heard of head spacers that slightly lower the compression... maybe one of these could help?

[GoodDayForADrive]

You can buy a head spacer that will lower the compression, or you can buy aftermarket pistons. Pretty sure those are your only options. Or you could buy a 16v head. :lol:

[Mr_Diesel]

You have several options... Only question is, how much money do you have, and how much power do you plan on running with?

First off, if you have an obd1 2.0L 8V ABA, then it's 9.5:1 compression.

Secondly, what are you talking about swaping heads??? Leave the stock 8V crossflow head on there! Its a good design, man.

Thirdly, your stock internals are FINE!! Don't waste your money on expensive aftermarket parts... Just make sure you do your fueling right, and get your tuning done correctly, and the stock internals will take care of you just fine!!!

Fourth, You can lower the compression with a copper headgasket availible from www.eiptuning.com.... Or you can double stack the all metal ABA headgasket. You can put 2 headgaskets on your motor, this will lower the compression great! I know a guy who is running 2 of these headgaskets on an aba scirrocco making 300hp.... Some guys say they have trouble with blowing the headgasket, but they are idiots, and did something wrong. The eip copper gasket is great, use that one. Also, use arp head studs, and you'll be golden!

I have done this exact thing with an obd 1 94 jetta... Mine had 249,000 miles when I put the turbo on, and I can't stress to you how bad I beat the ever living piss out of the car... I pushed that engine to it's mechanical limits and then some!

It is VERY easy to run a turbo on this engine.. The obd 1 engine is a fantastic engine to turbo for the following reasons:

Obd 1 2.0L 8v engine comes equipped with:

1. Forged Crankshaft
2. Oil squirters for each piston

Obd2 (96 and up) didnt have forged crank or oil squirters.

I was running about 10psi using a KKK k26 turbo. I was using a modified audi 5000 turbo manifold, and the audi wastegate. My wastegate was an open dump into the street. My fueling was corrado g60 injectors, and a vortech fuel management unit (rising rate fuel pressure regulator). Without a chip, I actually ran a little bit rich in the bottom end, and ran a little lean after 5,500 rpm... The rich I can deal with, but the leaning out problem was solved by shifting at 5,500 rpm (trust me... the car makes enough rediculous power well before the 5500 rpm cut)

My car was making so much freaking power that I started breaking crap inside my transmission.... I had just barely started the engine, let it warm up for a few mins... When I decided the engine had warmed up enough, I took it out on the highway on a COLD night... ICE COLD boost at 10psi was easilly 220hp and 260ft lbs of torque... The accuracy of the butt dyno can be argued, but this thing was damn fast... So fast I was loosing traction in 3rd gear with my street tires.

I decided to try to race my friend in his bmw m3 (don't tell the wife), and I used one of those manual boost controllers to turn the boost up to 14-15psi... Let's just say I blew the BMW's doors off in a race that didnt last long before he gave up. I LOVE the aba 8v 2.0L.

Look at it like this... The stock aba 2.0L 8v runs 9.5:1 compression.... I ran 15 (fifteen psi) with STOCK engine management with an engine that had over 1/4 million miles on it, and it blew the doors off a 300hp BMW. I can tell you right now... This engine is VERY capable of SERIOUS power. It will delivery this power reliably if you do it right.

Cheap - Reliable - Fast (choose only two!)

In the race with the bmw was (sort of) the death of my car. On the way home, I started seeing white smoke come out of the car.... Come to find out, my headgasket finally took a crap... After 249,000 miles of beating the ever living crap out of the car with 15psi, the headgasket finally gave way...

A few days ago I pulled the whole engine and tranny out to begin the rebuild to refresh it all. I"m converting the car to run a VR6 (o2a) transmission which can reliably take 300whp with a limited slip diffy. To do this I have to convert my 2.0 to cable shifting and hyraulic clutch... This has been quite the task but it is coming along really well.. While the whole shebang is out, I am having my head rebuilt... Seals, guides and valve job. I'm also doing a quick refresh on the bottom end... Main bearings, rod bearings, arp rod bolts, and new standard piston rings.... To top the whole thing off I'm going to go for some arp head studs... All in all, the rebuild on the engine should cost me around 400 bucks if I do it myself. I'm also going to replace the clutch with a nice fresh one. I'm going to paint the block (something other than black). I'll be deleting my compressor too. I think I might do away with the serpentine belt setup... With some help from some passat parts, I should be able to run my water pump, ps pump and alternator all with one v belt.

ANYWAY, after all this is put back together, I'll be running some better engine management. I've got to find a company that can burn me some custom software for my ecu... I'm going to run around 16psi on (approx) 9:1 compression. The higher compression should give me good daily driveability with good gas mileage, but at the same time gimme some freaking awesome power when I want it. I'm going to use EIP tuning's copper head gasket for this which will lower the compression a little... down from the stock compression of 9.5:1.

As soon as the project is finished I predict performance in the 200-250hp range with torque to match at around 240-270ft lbs... and this is definately not the limit of this fantasticly engineered motor.

If you have any questions feel free to let me know... I've made a lot of mistakes that you can learn from.