Fuel cut problem

[fudge]

So I have had this "issue" more or less a thing I have noticed that happens sometimes. Most notably when I am going up this on-ramp that is a 180 turn, I either down shift to second or am already in second. When I then apply gas sometimes I feel very prominent "fuel cuts". I put this in quotes because I don't actually know what exactly is happening, all I know is that my car definitely stops getting power.
This happened with my stock engine and it's happening more often now that I have a bp engine. If I had to guess I would think it's the exhaust because that is one of the few things that is still stock.
Just for some more examples out of my neighborhood there is a 90 degree turn onto a 4 lane road. I will be driving in second and, when the light is green and there are no other cars around, I like to hit it around that turn. So I'm cruising going straight, approach the turn giving light gas and harder as I go into the turn, by the time I'm at the apex I'm pushing the gas down until I'm flooring it. Then revs go up-then lag/cut in power.
I thought maybe it's because I'm going from no pedal to the floor? Or maybe I'm going to too low of a gear in high rpms, I have no idea really because I have no tachometer, just sound lol.
I wanted to experiment and right out of my work it's a yield turn to get up to 55 and most of the time there are no other cars so I like to take that turn fast. Im flying up to this turn, enter, and when I start accelerating, I can be in second or (less common but it happens) in third but mostly in the mid-higher rev range there is a blatant stop of revs as if I completely let off the gas with the car in neutral. So this morning, since I thought it was because I was flooring it, I gradually increased the revs where I would normally would be pushing harder/flooring it. Still happened.

I'm pretty sure this is an exhaust problem and that's what you guys are going to tell me, but I also have some trivia questions to go along with this!!
Not only what is the problem, but why is this happening, I'm curious! Like if it is my exhaust, why is it causing this to happen? Why will a new exhaust, or whatever it is, fix this?
Then, of course, what are some good solutions to this issue? Obviously fix it, duhhh idiot!
Thanks!

[FestYboy]

What's your speed when it cuts, and what trans is installed?

[fudge]

What's your speed when it cuts, and what trans is installed?

That's a good question! I'd say somewhere between 30-40 with stock engine. Right now probably 35-45, I will have to look down next time haha
edit: those speeds are for second gear.
edit 2: I just read this is probably an ECU thing.
edit 3: hydro g trans

[FestYboy]

Since you have no tach, the road speed will tell us what your rpm is, and I'm suspecting either factory rev limiter, or the harness is moving enough to cause a break in signal to fuel or spark systems. Time for a wiggle test. It will also be easier to track down if the cut out happens while turning in one direction only, and by your account, it sounds that it happens when turning right?

Just for reference, a stock B3/e series will fuel cut at 55mph, a g series (if using the B3 ECU) should cut at or just before 50mph.

[fudge]

So today it just happened twice! Yes, it's mostly when I'm turning right, never thought about that but I'm not sure that is the problem because sometimes it's just after I come out of a turn. Today I went on an on ramp I was coasting before hand and shifted to third at ~40 and held my gas through the turn exited applying gas and then it was fuel cutting right at 45 wouldnt go over 45 had to shift to 4th. then when i was going around a 90 degree different turn i shifted to second at ~30 and at just over 35 so around 37-38 it was fuel cutting i had to shift to 3rd. this is wack!

[fitsbain]

fuely tank or carby tank?

the carby has no baffles and as such can starve the fuel system if you are low and corner hard.

Carby used the bowl in the carb as a reservoir. Fuely doesn't have that so the tank needs baffles to keep the pump submerged.

[FestYboy]

^ given that his car is a 92, and BP swapped, I'm gonna say fuelie tank.

Ok, so we've eliminated rev limit as a possible cause. Time for that wiggle test. Start with the roll over switch harness.

[fudge]

Well I guess my last post didn't go through? maybe it will post after this one lol.

Anyways I thought it was funny I made this post and today this has happened more than it ever has and today was the first time it happened in first gear. This problem has got to go!
I looked up the wiggle test and wiggles every harness I could see. there was one that could be the victim but im not 100%. Where is the roll over switch harness? I couldnt look for too long because a storms a brewin!

[Studebaker]

I'm thinking fuel filter or fuel clog? To easy to check not to do it.

[FestYboy]

Roll over switch is behind the driver's side rear strut tower.

[fudge]

Roll over switch is behind the driver's side rear strut tower.

So like in the back of my car?

[WmWatt]

There is a pull out panel in the plastic liner to get at the rear light bulbs. That's probably where he means. Mine's carburetted so I don't have one.

[Eaglefreek]

Does this happen whether the tank is full or less than half a tank? I would T in a fuel pressure gauge and cable tie it to the wiper arm so you can see it while driving. Make sure you have a fire extinguisher with you in case you spring a leak. It also could be a loose wire. I had a car that would cut out when I turned a certain way at higher speeds and it wound up being a loose wire in a connector. It took a lot of wiggling to figure it out.

[FestYboy]

So like in the back of my car?

Yes there's a hole right below the speaker that allows access to the switch button. The whole panel needs to come out to get to the harness, not just the one for the lights.

[fudge]

Awesome now I have some good things to check when I find the time! It could be the fuel, I happened to be really low most of Yesterday so that could be a factor. This used to be a less often problem but now that it's happening more often I will pay attention to the gas and speed and such.
Now that I think of it, this problem happens mostly when I am turning right and going uphill, but has happened when going level, still turning right though.
I was trying to make it happen today and couldn't seem to do it. Maybe it was because I filled my tank up? I will post when I have an update.