I ran a ZL1 lid with a 5/8" spacer from tabio42 , it fits tight so I had to cut a small piece from the bottom of the hood with a grinder and the problem solved .
Thanks to all of the answers and replies. Basically I just wanted to know if it would clear if I used it. Sounds like the hood has to be modified. In order to run it
Yes. Extra plenum volume. A spacer typically raises manifold pressure about one pound with no other changes. To me that indicates higher airflow.
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Sorry, area should remain the same, but volume increases.
It's akin to having a larger plenum, and should make the directional change a bit easier, which in turn (pun, I know) keep velocity a bit higher, and could result in a bit more power due to conservation of energy.
Your moving the same amount of air into a larger mass/volume/area/space whatever term you want to use by adding the spacer vs adding no spacer. Yes the runner dimension stay the same entering the intake runners but you knew what I meant. So by moving the same air into a larger space the psi will drop as long as the air being moved by the blower is the same with and without the spacer.
I saw 0.7 psi increase in a back to back lid comparison.
Anytime you have a given mass of air in a volume, increase the volume and keeping the air mass constant will decrease the pressure and the temperature.
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I look forward to the testing. The Z brick is supposed to flow better than the V brick as well. I gained another pound of pressure after switching from the V brick to a custom aftermarket one. Heat rise also increased by about 5 degrees in a 3rd gear pull.
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Ive brought this up before but here is the inside of a zl1 lid and a ctsv lid
Is there any gains from removing all the high spots (extra support bits) inside the ctsv lid to make it smooth like a zl1 lid ? . Very easily done
Nothing to be gained from removing the reinforcing ribs. All you will do is make the lid significantly weaker. The ZL1 lid has the ribs on the outside.
I should say I couldn't quantify a difference. It may have. I just couldn't tell.
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I think he is talking about the spacer. I was saying I didn't see a difference in grinding down the ribs. I definitely saw a difference with one of my spacers
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Ok , since this thread is active I would like to make some inputs regarding the lid spacers , boost haven't changed but I can see a drop in the mid range rpm although I've gained 0.9 mph on the track consistently , I also noticed that the IAT2 reading increases smoothly ( it was fluctuating before the spacer ) .
I've got them in stock. GTO got his from me I believe.
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I have a D3 Zl1 lid and spacer installed. The spacer was suppose to calm the turbulent air? lol Nothing special happened!
The factory hood had to be cut. Now I have a vented hood and no hood cuts.
Coupe '13 A6
There are a couple V3 and Z06 owners running around with LT4 lid spacers that have been very happy with them. Maybe one can chime in. WeaponX sells those as well...
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If anyone is interested I am going to be on the same mainline dyno (Frankenstein) on the 4th and the only change is adding my D3 lid spacer back onto my ZL1 lid. I'll post up the overlay if you'd like.
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