They make plenums for boost as well as normal ones.
Yay or Nay?
If I have done the math right, it should bring my overall displacement from 1984cc to 2032cc as well as bring my bore / stroke ratio to ~0.90:1 from 0.89:1 stock.
And from what I can tell, the closer to square / Oversquare, the better? (allows for easier revving to high RPMs)
Although I guess since I'm not changing the stroke, it really wouldn't matter in that aspect.
So after my last post, I started reading about compression ratios, and how to raise or lower them.
Realized I literally had no idea what I was dealing with,, and that my last post is kinda dumb.
So I am trying to do as much research as I can before I actually get my parts, but I realized I can't really do many theory measurements, as when I get the head I am going to have bigger valves put in as well as a multi-angle valve job, and I feel like this is going to alter the CC's of the combustion chamber. Will any changes to the volume be significant enough that I should wait to get the head work done and measure, or would I be safe to do some rough guesses using values for the combustion chamber I have found?
Quote, originally posted by CrackerX » I measured the cylinder head combustion chambers of a 1.8L and 2.0L head with a Bosh triple copper plug installed. The 1.8L head was 41.6cc's on average, and the 2.0L head was 43.4cc's on average with a +-.2 cc error margin. Very different from the 45cc "accepted" value. Neither head had been shaved as far as I could tell...
Over the weekend I drove out to Ohio and came back with enough parts to have a 16v ABA on ITB's assembled by the end of next month. BUT, that would be all stock internals, and no more head work than just a PnP.
Unfortunately, now that I have most of the parts I need to get started, I have to deal with a more serious problem with my car. Floors need to be replaced ASAP. UGH
32.5mm Intake / 28mm Exhaust
34mm Intake 28.5 Exhaust
Or should I piece together a valve train instead of buying a kit?
So far the build threads I have read on here, including the ones linked earlier, and some I found, they have used +.5mm valves, so that's what I'm going to use.
Downside, I found a pretty good deal on a completely unrelated part, so I might have to pick that up before I can buy my valve train.
Yay for parts ADD
Before I bought the head I was told it was "very port and polished" so now I'm terrified that I'm going to spend a bunch of money on valves, and end up with a head that flows like garbage for what I'm trying to do.
This is the machine shop I had planned on using as it is 10 minutes from my house.
Here are some flow graphs for my head,
Damn you Frechem.
Why am I mad at you? Because when I started planning this I made the decision that what ever I'm doing, I'm going to do the best way I can, and now you're screwing things up by hating on the machine chop I was thinking of using and pointing out the throttles I was looking at aren't very good.
Last edited by Sycoticmynd29; 10-08-2012 at 01:08 PM.
He is just trying to help from his experience. Maybe the machine shop will be fine but many have found machinists that specialize in VWs many times do it better.
I would also steer away from bike ITBs. they make throttle response very touchy and the throw is extremely short.
I would not do bike itbs. I ran gxxr itbs on my car for almost two years and yes the made good power. And can be done on the cheap. But now that I have my badger 5 set up it is like night and day. The drivability and easy tuning made me wish that I had just spent the extra 500 or so more, years ago. Do your self a favor do it the right way the first time or in a few years if you still want itbs you will end up buying new ones. I did and can't be happier.
At this point I might run the bike ITB's as a temporary set up just to get it running on ITB's, as I already own a set of bike throttles (included in the parts pick up I did a few weeks ago)
End game I will be going with either the TWM's or the Jenvey ITB's (aren't Badger5 throttles the same as the Jenvey throttles?)
I was originally going to go with the Jenvey's, but Frechem pointed out a handful of flaws in them, so now I'm going to look into the TWM's a bit more, even though they cost more than I paid for the car itself
Last edited by Sycoticmynd29; 10-08-2012 at 01:08 PM.
Yes badger 5 and jenvey are the same itbs. Bill at badger 5 gets them grime jenvey and installs his linkage so you can use the stock Vw cable. As for flaws the only thing I did not like about them was the fuel rail but with some custom brackets I was able to run a Vw 1.8t rail.
All good points. Taping wasn't that bad. I'm running a 1.8t rail with stock Vw fpr. jenvey sells a dished filter plate. maching them wasn't so bad and the badger linkage works real nice. I see where he is coming from but with a little DIY knowage i found it nice not to spend the extra $. Plus when I went to order the twm ones the where back ordered till the end of the year.
then again, the throttles and stand alone are going to be some of the last things I get for this, so I still have plenty of time to really make up my mind.
Hopefully picking up this transmission this weekend, then all extra money I get will be getting set aside for the valve train and head work.
I'm going to start talking to Jarod at SCCH about some work and some prices, turn around times, and all sorts of other fun stuff.
Frechem, what was your power at the wheels last time you dyno'd it? Last graph I saw was from 2010 and had you at ~165
I saw that you went with the stg4 head from SCCH, which is what I'm going to be doing, but I also saw that you have your rev limit at ~7500.
I'm beginning to get kinda worried that my power goals are unrealistic.
I have my rev limit set at 7500 because I don't need to go any higher. From my other dyno runs I can tell I start losing power around that point so that's where I set it. I'm sure the head could take it but my bottom end isn't built for high RPMs.
If you're looking for 200 whp then be willing to spend a MAJOR amount of money. A 9000 RPM motor will help you get to 200 whp but that will be a very high sprung race motor.
I would not recommend chasing numbers. That can be a huge waste of time and money.