Recent content by MadScientistMat

And now I made a video of the weatherstrip installation.

This weatherstrip needs to go. It needed to go several decades ago. Today, it went.

Dan's RockAuto radiator story reminds me of a time I tried to order a radiator from them for a supercharged Buick. The non supercharged cars had a thinner radiator. They did have one radiator listed where the picture showed a drawing with dimensions. Sure enough, RockAuto sent me the thinner...

While somebody designing a TBI absolutely ought to test it with at least two separate O2 sensors - and ideally a set of EGT probes and all the other instrumentation they can afford - it doesn't make much sense as a selling point. Trying to use both O2 sensors for anything more than an average is...

Well, I've been putting together one thread in the fuel and air systems forum already that could be useful for an EFI forum. Or stay where it is if that forum doesn't happen.

I've had a look inside one of those control units - there's no microprocessor, the only load input is a TPS, and there's a total of five or six adjustments you can tune. I'm kind of impressed it was able to perform anywhere near as well as a good Quadrajet. Fun fact: These Holley Pro-Jection...

Yes, it also works great in cases where vacuum signal is what's making it tough to get a carb in tune. And next I would like to elaborate on one thing TT5.9 mentioned, grounding. Thanks for bringing that up. It's easy to think ground is ground. But not when you're running 10 or 20 amps through...

There are some cheap oscilloscopes on Amazon or Seeed Studio that will work well for this sort of thing. One warning - expect spikes in the 300-400 volt range on a signal coming off the coil. You may need an attenuator, or a voltage divider.

Might be an anti slosh device. The nearly horizontal fuel filler on early A's is notorious for having fuel slosh out the gas cap if you completely fill the tank, so there are several items the aftermarket has cooked up to try to make it easier for fuel to go in than come out.

I'm waiting to see the results of testing with the coil unplugged.

For certain values of use it. Imported STL files generally can't be edited easily.

Next one - how do TBI systems fit into this? When it comes to drivability, you end up about halfway between a carb and a multiport EFI setup. If you're after drivability, maybe half the gain for half the work of an MPFI system appeals to you, although you may find it's closer to 3/4 of the work...

Those are certainly pretty common newbie mistakes. Old car wiring wasn't designed to support anything more sophisticated than a transistor radio. And don't forget non-resistor spark plug wires. And the next item I wanted to go over: If you're considering an EFI conversion, consider your goal...

We have threads pop up from time to time where somebody is wondering if they should switch from carbs to EFI. I worked at DIYAutoTune in technical support for 14 years, and some EFI conversions have turned out much better than others. I'd like to share some tips to make sure that you can make an...

I'm getting started on it now. I'll split it into a couple different posts.