I'm putting a MC engine into my 1988 90q and I have one of Blau's 272 deg. cams sitting around. I'll be running efi and hopefully a tubular exhaust manifold. Will i be better off(i know thats subjective) with the stock turbo cam or should I use the NA cam from Blau. I'm leaning towards the stock cam. thanks
11-03-2004, 01:07 PM
11-03-2004, 04:21 PM
11-03-2004, 05:53 PM
11-03-2004, 06:27 PM
I'm thinking the less overlapp might actually gain some power up top because of all the back pressure in the header. 40 psi max right now, at 25 psi of boost, that's 15 psi working against the turbo durring overlap periods. Right?
11-03-2004, 06:30 PM
You have a heavily modded MC-2. It might be different in every car. Its not that hard to put in! :) Just try em both out!
11-03-2004, 06:35 PM
<a href="http://webpages.charter.net/typ85/engine%20Code.doc">ENGINE CODES AND CAM SPECS SPANKY!</a>
11-03-2004, 06:43 PM
11-03-2004, 07:27 PM
11-04-2004, 06:16 AM
11-04-2004, 09:21 PM
Now, question. You list the NG as having two different cams. Any way to tell the difference between them? Does the early version have full lobes all the way around? If your paper is correct, I think I have 5hp free sitting in my garage...
11-04-2004, 09:40 PM
11-04-2004, 09:56 PM
Here is where I "stole" most of my info, I don't know why the later NG had 5 more hp.....<ul><li><a href="http://www.humanspeakers.com/audi/engines.htm">Huw's codes and specs</a></li></ul>
11-06-2004, 09:41 PM
they sold me their 'sport' cam package that made my 5k run like total crap. when i finally swapped the cam out, got it analyzed and found it was ground improperly.
after spending thousands there religously for years, they treated me so poorly. basically, i got to talk to 'the hand'.....im beyond disgusted. to think that after all the heart i thought they had, being from the midwest like myself, always talking so friendly with that endearing accent, giving descent tech support occasionally, appearing friendly,that theyd do such things.
please do not support them.
it hurts to say that about a supposed audi family
11-08-2004, 08:39 PM
x-post from http://www.motorgeek.com/phpBB2/viewtopic.php?t=1432&start=25
More impressions, the more I drive the car, the more I realize the 272 was just a huge pain in the ass. I'm so convinced, that I'm really going to try and get to the dyno again to prove it's a waste of money.
1. Idle has improved greatly, it's rock solid now. The 272 was always close, but I could never seem to get it right on, and idle was always thrown out of wack by accessories turning on, and temperature. Ugh.
2. Yes, there is a little more low end torque, and spool is a little faster, not a ton though.
3. The power delivery is a little different. Here is how it feels. The red plots are the last pump gas dyno, and the green is how it seems to feel now.
4. I think the 272 gave the illusion it was more powerful because it was more spastic. When power hit, it hit pretty hard. Based on the clutch slip I was getting last night, it's true, the MC2 is making more power.
5. I was able to reset the basic map back to all 1's and the car runs awesome. Just messing with the main PW adjustments had the motor running perfect in less than 5 min. The only change I had to make was the very top bins to 1.15 because I tried about 27 lbs of boost, and uh, it was cool. Oh yea, and I got 20 mpg on my little road trip. Haven't done that in a long time.
I honestly think the overlap on the blau 272 is what kills the whole deal. One of these days I'd love to try a higher lift cam, that has very little or no overlap, if that's possible.
11-08-2004, 08:41 PM
11-09-2004, 12:29 PM
11-09-2004, 12:35 PM
11-09-2004, 05:24 PM
11-09-2004, 05:36 PM
You might be able to advance it so the intake is the only one open at TDC, but there's still overlap, which on my car lets 40 psi of exhaust back pressure into the intake at some point.