Re: Let\'s have a little contest!
update from joe for you contest participants.
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Hey John,
Well, I got back on the dyno today….We need to talk about a few things… First, never run platinum plugs with a supercharger !!! I made my second pull and found those when I checked the plug read. The tips come off with the additional heat from the blower….it could have been a disaster if I wouldn’t have caught it.
Second, the tensioner set up is not the most ideal set up either, it hops the belt at high rpm. We need to think about a manual adjuster. Hopefully it never breaks again for your sake. Third, the two fuel pumps pull too much amperage for the 25 amp fuse in the factory setting. I had to step up to a 30 amp fuse which is higher than the wiring rating…it could potentially melt a wire.
Fourth, remember how I told you I heard a squeak at idle on the first pull? I thought it could have been the belt before it broke….after I put the belt on, it was still there. Well on the third pull, it bent a push rod…..I had some other stock rods laying around and slid one in….guess what ? The squeak is gone. I took the other side apart and found another that was slightly tweaked, so I replaced it also.
OK, now we are back to making pulls and the car flutters on boost at 11-12 psi. I found the by pass valve had no vacuum line run to it. I added that, which will help the cruise portion of drivability, but won’t effect WOT. I need to adjust the valve to delay the release point to build more boost, but I don’t know how much you motor will take on pump gas….I am going to move it to 15 psi and finish making the pulls on 104 octane gas.
I also found the air filter 90 degree elbow ***** in under boost….we need to change that because it will restrict the amount of incoming air….another potential problem.
Anyway, I wanted to give you a heads up on progress, but it was too late to call. It starts to make good power and then the by pass starts bleeding off boost and the gauge starts to flutter and you get a big dip in the curve. When it starts to build boost again the power starts up again. If I keep it fat, 11.5 to 1 it builds boost slower, it is not as noticeable. but when I bring up the air fuel to 12.2 to 1 and roll in the timing curve, it builds 13 psi by 4000 rpm and falls on its face. I will start on it again tomorrow, but I have a car to tune from Milwaukee in the morning first.
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the email goes on about some hp and tq numbers, but that part is TOP SECRET for now. i could tell you, but then i would have to send
JUCD VPR to hunt you all down and kill you.
! I'll be home soon boys only a little over one month left. 2 weeks of leave ahh i can't wait! My Viper misses me!
