OK. Don't laugh if this is a stupid question. I just want to do it right when I install it. I understand that i need to use 6mm hoses when I install it. The connecting tips on the boost controller are MUCH smaller than 6mm in diameter. What's the best way to connect the 6mm hoses? And what's the importance of using 6mm hoses if the connecting tips are smaller than that? Did I get a "wrong" version of the controller?
Someone please ease my mind so I can sleep at night.

 

I guess you didnt sleep last night LOL.

I had it, and was worried about the 6mm hose as well. I called up Dawes, and they told me its fine to use the smaller diameter hose, but one of the guys I know has it, and he said you shouldn't use the smaller diamter hose.

So what did I do? I experimented. I drove around with the 4mm hooked up and then with the 6mm hooked up. With the 4mm, boost will rise up a bit faster, but it may overshoot your preselected level, and so you would see the boost rise up and then drop down a bit to where you have it set it up as. With the 6mm, it wont overshoot, but you might notice that it doesnt build as fast. It's just one of those things where you THINK you feel it but you are not sure. I just went ahead and stayed with the 6mm.

 

Thanks for your input. So I should go with the 6mm hose. What's the best method to make it fit on the small connecting piece of the boost controller? A 6mm hose would be extremely loose.

I still can't sleep, but I'll rest my eyes

 

when I initially received my dawes valve I bought all 4mm vacuum line and installed it. When I went for a test drive the transition had a large and lengthly dip and the car overboosted like crazy. my boost pattern was something like 11-6-17. I thought I hooked something up wrong. I talked to KD and they told me to use 6mm hose. I put the 6mm line in and the car ran beautifullly. Spool up was increased over the stock setup and the boost came on stronger. Best of all, there was little to no transition spike.
When I bought my dawes valve a year ago, they were made with larger barbed fittings on the ends. the more recent dawes valves have the smaller barbed fittings and it also had a 90 degree elbow. Honestly, I prefer the older setup. The 6mm hose doesn't like to stay on the new style. What I've done on a couple of friends' cars is double zip tie it with the smaller type zip ties. I have never seen one pop off yet so I know this will work. There, now you can sleep..

BTW, I believe Flybye had the PFC when he went with the dawes valve. I remember him commenting that the PFC controlled the boost much more accurately than the stock ECU did. He said this before her even installed the dawes valve. This may be why he didn't have as much luck with the dawes valve as he may have planned and it may also be the reason he had different results than I did when he used 4mm vacuum line.

 

Yes! I can sleep!

Thanks

 

Hey Silver, I have had the Dawes for a few months now and am using 4mm hose on the "small" end. So, you are saying that if I use a 6mm hose on that end that I will see a very small....if any....transition between the turbos?? I guess I just have to zip tie the **** out of it or maybe even a small clamp. Let me know if you think it would make a big difference and I will go out and do it immediately. Thanks Silver

 

I had used the 4mm on all the lines including the prespool lines. When I switched to 6mm it made a big difference. If you only have 4mm on one side of the dawes valve and 6mm on all the rest you might not notice much of a difference. If I were you I would at least try it. I actually used 5/16th or 7/32th inch or something (I can't remember exactly what it was) hose beacuse I had a bunch laying around and it was very inexpensive to buy. I did a little write up on this. Here's the link:
http://members.tripod.com/modifiedrx...Controller.htm