408 CI SMALL BLOCK CHEVY, PROJECT SLEEPER: DYNO TEST!!! WILL IT MAKE POWER???

We also had a massive exhaust leak on this side, which can throw off the O2 sensor readings and then we also connected the vacuum port to the carburetor because in the video where I showed the vacuum gauge here it was pretty revealing even though we were trying Rather than finding valvetrain problems that we didn't see, we did see that as the RPM increased, the vacuum increased on the gauge. that's an indication that the carburetor is a restriction so with that being said let's jump in here and take a look at the numbers and I'll update you on where we are so this is the last run we did. with the progressive ignition you got 476 horse

power

four actually 477 480 LBT of torque and then you see how we get the 57 5800 it just drops like a brick so let's look at the next file now this is with the DUI dealer.

See it accelerates cleanly here, there's no drastic drop off topping out at 472,478 torque. Now you may be wondering about this right here, which is a function of the mechanical advance on that distributor not being tuned correctly, so don't pay as much attention as we were. trying to find the problem of why this thing wasn't accelerating cleanly from here to here, which we found, so today we have some really interesting things we want to try and see what kind of luck we can come up with. So we return the second day. What we are doing is repeating exactly what we saw yesterday in the last race.

Make sure everything is still fine. What do you think? Greg, we'll see. We're about to find out what. Do you think about the quadri jet? Are you surprised? Yeah, he's uh, yeah, really surprised. It seems like the really good running carburetor air-fuel ratio was dead on throttle response. uh, it's actually for a tram that stabs the accelerator to leave them here. I mean, it's unreal, what's with that one-plane admission? You're still questioning it, no it's not a flat torque curve. I mean, I can't argue with that. Do you think you like it? Like, okay, so let's see if this thing repeats what we did yesterday and then we can start.

Looked good to me, there you have it W almost a mirror almost a reflected image yeah look that's exactly the same thing yeah 474 474 so one of the things I noticed in that video was that the vacuum was increasing as the RPM was going up , so now that we have it connected to the

test

bench we can see it in real time. Now let's redo this. There you go, this is playing, that's not it, yeah, well, it is. a little bit 3 yes at 6100 yes so it's a little bit of a restriction a little bit yes a little bit yes a little bit and you can see it's yeah right at 6,000 it really starts to fall yeah so it pretty much doubled What we did yesterday , let's put the dealer squat.

I don't know if you can hear me because we have the fans on here, but we're going to put the progression ignition distributor back in and go from there. Let's see what this progression ignition distributor does and we're ready to go, okay, letter P, that clean red, that sounded good. I think it's probably a new record, new record, all right, new record, baby, almost 480, yeah, we've rounded up. It has 4,494 torque and 480 horse

power

. This wouldn't be a quadr jet

test

if we didn't run it with the air filter, so we'll do it with the lid in the normal position and then do the quadro.

The jet mod that everyone does is twist the cap to see what it does, it's already getting a bit rich so I think the problem

will

be a lot worse but there's only one way to find out isn't there? ready, I guess he's going to drown 10 what to do what everyone guesses 12 okay 10 to 15 okay, let's see if we're all wrong or right% right yes, he killed him wow wow more than that wow wow wow but let's take a look at the air fuel ratio, it's going to be even worse, it's probably 30 horsepower no, it improved, it didn't actually improve much, but it was pretty much the same, okay, but you know what the brake specific hseep is. probably worse, yes, brake specific Kills 30 horsepower with the cap on the right.

I'm going to turn it up, I'm going to flip the lid, but look, that's every Quadrajet gu. The first mod is to flip the lid. Dad didn't know since you put it back in when you took the car home, okay, we do the same test, yeah, there you go, press that pedal hard, what

make

s the lid spin? Oh my god, almost 25 horsepower 25 horsepower, guys, that's crazy, let's turn it off and overlay it, yeah, okay. turn this off and it's fine, so turning the lid apparently works. Wow, I never thought about that that much, that's crazy, right?

Yes Yes. I never thought it was holy shit, on the contrary, there is the difference in the flipped cover. Are the air and fuel going? See, this is what I like. I mean, it's just fun. I mean, who would think 25 horsepower? So the previous one with the lid on was definitely a lot richer, a little bit richer, so the black one, that is. The last one, um, those lines are a little bit above the others, so here's the deal we made, 480 horsepower, 494 lb-ft of torque, that pretty much sums it up, we're ending on a really high note, Joe is happy, Greg is surprised, and Dennis, what?

Are you happy and surprised? There you have it, that's the kind of thing you see here in the Unity Motorsports garage, where we

make

horsepower no excuse and until next time, see you later.