Looking great! Im with Chad on this. I would love to see more about the sub enclosure's. Maybe you could do up a "Tech Article" on how it was done :zlove: I love the position and you have got a 2 seater so im even more excited. Im not so fussed on using my entire boot for subs, but i would love one in their somewhere. Good work with it so far. Hope to see more pics :zlove: Cheers, Adam
Matt please help me- Im also in the middle of installing my dynamat and need to know exatcly what tools you used...
see pm re tools for others, basically surface prep with septone wax n grease remover so that the dynamat can cling to the panel then a stanley to cut the stuff, I tried using scissors but they get clogged up pretty quick and the back of a screwdriver handle to rub over the dynamat, to press it on nice and good
Upper Plenum This one is a work in progress at the moment. Essentially, I bought a spare upper plenum to play with. My theory is that the rear cylinders run lean because at WOT and high rpm, the air entering the plenum is going in there at too high of a velocity, this causes it to pile up at the back of the plenum and feed the rear cylinders better than the front ones. If the rear ones get more air, then they run lean, and the front cylinders would run rich (relatively). My aim was to slow down the intake air by using a larger throttle body, so I got two VH45 TB's from the wreckers. Additionally, I think that using a larger TB will result in a lower pressure drop in the intake circuit, more on that later... My spare plenum, chopped each side off: That's been match-ported to the lower plenum: Making the throttle body flanges from some 20mm aluminium, it needs to be thick so that I can tap a thread into it: Finished 1, 1 more to go: VH45 TB: With flange: Almost there: Money shot: I'm not sure if you can make it out in the next 2 pics, but the stock TB's shoot up into the plenum, not directly into it. I'm contemplating changing the angle of the TB flange face so that it's orthogonal into the plenum chamber, not pointing up like the stock ones: VH45 TB on the left, Z1 upgrade in the middle, stock on the right Here's one of my flanges sitting over the stock TB, you can see the difference:
hell yes man .. thats awesome.. love your work mate!!! keep us in the loop with any further developments of the plenum of DOOM
That will be so fun to weld back together Ally's bad enough at the best of times, specially cast ally...
they were my thought too chrispy very fragile. Perhaps make a fibreglass of carbon fibre plannum using the alloy one as a mould??? could it take the heat and vibration?
i think its cool to try and improve but i think you have gone for a massive overkill here. You will probably have wide open throttle from about half pedal now. and unless you have a well designed progressive cam set up for the throittle opening, it will be very difficult to control
Agreed, infact I think it will be borderline undrivable but I commend your ambition though. It will feel uber lazy due to the lack of velocity and to go anywhere with any kind of torque will require WOT all the time. It will run like crap until peak rpms I suspect, try it and report back and see if our assumptions of this not working right are correct! It could be done with some kind of staged twin throttle setup to retain drivability, but oh man what a can of worms for bugger all improvement. The real way to do this would be to switch back to a single tb/turbo setup and fab up a custom sheet metal intake for the 90mm tb but I'm not winning that fight on here! lol
a single 90mm tb can flow a massive amount. maybe chrispy would know how much in CFM? 2 x 90mm would be suitable for over 1000hp id guess
PITA, I'm not doing that sort of Maths on a weekend... I'd be guessing just under 1000hp per throttle. Remember that CFM is hugely dependant on the pressure more than anything.
To clear up some mis-information on the sizing of the throttle bodies (ppls saying that they're 90mm etc), here's some happy snaps: VH45 Input diameter - 84mm VH45 Output diameter (choke point) - 80mm VH45 Shaft diameter - 12mm Z32 Input diameter - 55mm Z32 Output diameter (choke point) - 51mm Z32 Shaft diameter - 10mm (this pic looks like I didn't line it up right, but I did that because I wasn't holding the butterfly open WOT cos only 2 hands, and I think it's accurate or very close) So VH45 TB open surface area (minus the shaft) comes up as 19146mm^2 and Z32 TB open surface area (minus the shaft) comes up as 7661mm^2. Which gives a ratio of about 2.5 times larger.
haha nice one simmo, that nick could stick~ yeah it should look like a stock plenum, on steroids - that's what i'm gunning for :zlove:
Yep, I cut it open with my oxy so I was able to take the time to play with it and get some experience with it. It will be fun, I'm counting on it That's why I do things like this, because I CAN :zlove:
Yes, varying the throttle cable linkage cam thing to develop a profile that has a varying distance from the axis of rotation has been considered, it'll result in a non-linear foot response though - I'll solve those issues when I come to it.
Area of a circle mate. (Pi x R^2) For example 4" vs 3" vs 2" 4" Diameter = 12.56~ inches square of area 3" Diameter = 7.06~ inches square of area 2" Diameter = 3.14~ inches square of area So although 3" isnt double 2" in terms of diameter it is more than double in terms of area. And 4" which is double 2" in diameter is 3x larger in area. This image below should help. These 3 circles are 200, 300 and 400 units across.
