It has an unpleasant drone at 30 mph (3d) and 50 mph (Od). Sound like pulling up the 120hz lever on your HiFi equalizer.... (boooooooooooh)
Time to upgrade exhaust
- Thread starter mhjo
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It has an unpleasant drone at 30 mph (3d) and 50 mph (Od). Sound like pulling up the 120hz lever on your HiFi equalizer.... (boooooooooooh)
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JonK
Member
Have you installed the VT's? I'm curious to see how you like them. I plan to get these for my car once it's running and would like to know how others who have them like them. I like the idea of a 'quiet' exh. with the ability to open them up with RPM.
Jon
Jon
The VT's are last resort. Today we will open H-pipe, and open the holes in the two main tubes (they are very small) in order to increase crossover flow.
I will report how that works.
Another tip we got i n order to reduce drone was to move one of the mufflers a couple of inches forward so that they no longer align.
I will report how that works.
Another tip we got i n order to reduce drone was to move one of the mufflers a couple of inches forward so that they no longer align.
Report fro mincreasing holes in H-pipe.
We cut off the H-pip (transverse pipe) and inspectes the holes in the main pipe. On the left tube the hole was 1 " diameter, on the other only 1/2 ".
We opened noth holes to match the diameter og the h-tube, and welded back in place. However, it did nothing to the drone, meybe even increased it.
So, I'm back to replacing super-turbos with "drone free" VT's..
We cut off the H-pip (transverse pipe) and inspectes the holes in the main pipe. On the left tube the hole was 1 " diameter, on the other only 1/2 ".
We opened noth holes to match the diameter og the h-tube, and welded back in place. However, it did nothing to the drone, meybe even increased it.
So, I'm back to replacing super-turbos with "drone free" VT's..
I can't help feeleing that the car became slower after replacing the shorty headers with HiPo manifold - am I dreaming?
Latest:
The Dynomax VT's have arrived at the post office, so they will be installed soon. I will report results then.
Latest:
The Dynomax VT's have arrived at the post office, so they will be installed soon. I will report results then.
PoppyMod
Member
? I'm considering the same set up.
Report - Dynomax VT
1. They are almost totally silent at cruising
2. They do not drone at any rpm
3. They scream like a cat when you rev up
Possible drawbacks:
1. You will start hearing all sorts of sounds from the mechanical devices in your car
2. You might fall asleep while driving
Note: They are more silent than the Super-Turbos I had previously, both in 2 and 3 muffler setups.
Note 2: I still have the rear resonators on
1. They are almost totally silent at cruising
2. They do not drone at any rpm
3. They scream like a cat when you rev up
Possible drawbacks:
1. You will start hearing all sorts of sounds from the mechanical devices in your car
2. You might fall asleep while driving
Note: They are more silent than the Super-Turbos I had previously, both in 2 and 3 muffler setups.
Note 2: I still have the rear resonators on
Of course I do, and everyone is asking me the same question.
I guess the RD team at Dynomax did the same.
However, I read somewhere on the net that there was a guy who experienced rattle in the chamber, but that Dynomax offered return and compensation. Also, that there has been made improvents in the design since the first batches. Only time will tell weather the mechanism will last or not.
I guess the RD team at Dynomax did the same.
However, I read somewhere on the net that there was a guy who experienced rattle in the chamber, but that Dynomax offered return and compensation. Also, that there has been made improvents in the design since the first batches. Only time will tell weather the mechanism will last or not.
CochinoFilipino
Founding Member
Just a note: From what I understand, a cross-over needs to be properly placed to be beneficial. And not doing so may even hurt performance.
I don't see how improper placement could hurt, but it's been established it needs to be as close to the engine as possible. Placed back by the mufflers, it'd be useless.
Fuel-Injected Corvettes have the crosstube wrapped around the engine.
