beaterX project thread - Page 47

**scheides** · 06-07-2011

Quote:

Originally Posted by Shane@DBPerformance

380

Knowing my luck and my cars, you're probably spot on

**Murlo26** · 06-07-2011

At least at 380whp you won't break anything

I think 430whp (your goal) should be easy, but I am a nub.

**scheides** · 06-07-2011

I was thinking about it some more.

According to DW their pump is good for 600whp on MAP's dyno @ 14v and at 15.75v mine was about at the limit, so 600*(15.75/14) = 675whp @ MAP /1.15 (convert to DB dyno dynamics) = 586whp, I think if I can get about that I will be happy. If not, I will just list the car for sale, it's no fun anyways.

**mlomker** · 06-07-2011

Ricer math ftw. I'm doing the same calculations on my Weldon. :\

**scheides** · 06-08-2011

Ok, doing boost control testing I'm getting some inconsistencies--I'm trying to get it sorted. So glad I have e85 so a little more boost doesn't hurt a thing, and I obviously have enough fuel now with the BAP turned all the way up, and I even leaned the fuel map out a little

This is ~33psi to just shy of 7000rpm tapering to 28 at 8500. Go 'lil BBX GO!

Again, different starting RPMs!

Earlier today I mentioned to Hughes that I should upgrade the fuse for the fuel pump from a 20a to a 25a or 30a...prolly not a bad idea right? On the way home from Wagner's tonight sure as shit, it blew and I coasted into robbinsdale. I swapped in a 30a when I got home

Did I mention I'm having a blast getting the car dialed in? 4th gear the car just fukin rips!

95talonracer · 06-08-2011

When were you dynoing?

**Murlo26** · 06-09-2011

Wow, looking great Scheides! Can't wait to see it fully tuned up

**scheides** · 06-09-2011

Weds.

Matt D. · 06-09-2011

Looks great! I forget, is this logging a wideband or narrowband O2?

**scheides** · 06-09-2011

Narrowband, LOL yea right!

Wideband fo sho.

To be clear, the boost just happened to go this high, my goal is to keep it right around 30. It was a good test of the fuel system though, so I am happy with it.

Matt D. · 06-09-2011

Quote:

Originally Posted by scheides

To be clear, the boost just happened to go this high, my goal is to keep it right around 30. It was a good test of the fuel system though, so I am happy with it.

Just happened to go that high... Yeah, right!

Are you worried about the stock wiring being the weak point with such a large fuse in there now?

**Murlo26** · 06-09-2011

That is the idea of many fuses, to protect wiring, not protect devices. Basically anti fire device

**Kracka** · 06-09-2011

Quote:

Originally Posted by Murlo26

Basically anti fire device

Yes, but only if they're properly sized for the gauge of wire they're being used on. Going from a 20A to a 30A doesn't sound like that big of an increase, but it's still 50%.

**Murlo26** · 06-09-2011

Well what gauge wire is the fuse on? 14 awg maybe? 14 is good for 15 amps, 12 awg for 20 amps...and so on.

I am an electrical engineer, done plenty of fuse sizing in my day.

**Kracka** · 06-09-2011

So say it is 12 awg since the factory fuse was 20A, wouldn't running a 30A fuse on it become a fire hazard?

**Murlo26** · 06-09-2011

Possibly yes, depending on the wire rating. Some are rated for higher temperatures. What I quoted was the 75 degree C wire rating. There is also 60 degree and 90 degree and really high temp stuff that you can get away with a lot more.

75c is the norm typically though at least for industrial use, I am guessing auto is similar.

It honestly all depends on what kind of current he is actually drawing. If I knew that it would be easy to tell you. And it also depends on the type of fuse. There is an entire icky thing called fuseology...basically you have fuse curves that depending on current levels and length of time at those levels the fuse will be fine or blow. It gets messy.

**scheides** · 06-09-2011

Yea I would put in a 25A fuse but all I had was 30. I don't expect it to be a fire hazard as it's not going to continually run at the full 30a. The kit itself includes an upgraded 40a fuse so anyone that has installed one has likely run into this same problem.

If it ever is a problem, I make sure to carry a fire extinguisher at all times in the trunk.

**Murlo26** · 06-09-2011

^I am going to start carrying one myself. I think it makes sense with the level of modification I have.

**scheides** · 06-09-2011

FWIW I had done probably 10+ pulls w/o blowing the stock fuse so I'm guessing it's running right around 20A. The weird thing is that it blew right as I was getting on it, not like at the top of 4th gear or something (after a looooong pull at high amperage).

**Kracka** · 06-09-2011

Probably due to a quick spike as it turned on I bet. Like turning on a light, the initial surge is always greater than constant draw.