Rob B.

I did a search and chances are my ABV question hasn't been covered because its just too simple... Anyhow, I'm about to put my T-II (emissionless) in the Opel GT. I cannot remember which line attaches to the ABV, and which one attaches to the attaches to the pressure sensor and soforth. I am without a ACV, and from what I saw, the ABV attaches to this. Is there another way to hook it up or should I ditch it for a BOV? (there isn't enough room in the engine bay for the ACV)

I have to build a new turbo manifold for the same reason (the turbo won't fit in the engine bay without its being moved). Anyhow, when we measured it today, it seemed that I won't be able to use the 2" ID bends and pipes, as they are too large for two to fit. Its a lot more probable that I can use 1.5" ID bends and pipes, but is this large enough? The bends I am talking about are weld-els, a type of black coated, schedule 40 steel. My original plans involved a 3-3.5" downpipe, but that surely will not fit, the maximum now will be a 2.5" downpipe.

To be a little more specific, the turbo will be mounted in the front right of the engine (in front of and to the side of the pulleys) at a 45 deg. angle to the engine, to decrease the number of bends the exhaust has to make on its way out of the car.

Thanks,
-Rob

Rob B.

Anyone?

Rob B.

So I looked on teamfc3s.org and from what I can tell from the manuals, the ABV seems to hook up to the dynamic chamber or at some point aft of the TB. Is this correct or was I reading the schematic wrong?
-Rob

iceblue

You can simply T the ABV and PS together into the nipple on the fender side of the UIM. If you want any boost numbers you will need a min of 2.5in DP and a large such as 3in TID.

Rob B.

Ok, thanks, what size would you reccomend for the runners on the turbo manifold? I originally thought 2" ID piping, but that will not fit with a 2.5" downpipe, is there an optimum size that is perhaps less than 1.75-2" that will keep velocities up and flow up as well?

I also planned on using the stock AFM, but a 3" TID shouldn't be too much trouble. I've gotta fabricate most everything else anyway.
Thanks again,
-Rob

Rob B.

Ok, so I was reading Maximum Boost by Corky Bell and according to that, smaller runners are, to some extent, better. I'm not sure the maximum diameter I will be able to use on my turbo manifold, but I am sure that 2" (each) will be a stretch, if possible at all. Is there a size that would be (dare I say more?) appropriate or even just the best of the worst? I'll have to go and remeasure tomorrow, but now I'm thinking the max. diameter will be roughly 1.75" each. Will this cause too much backpressure, or be decent in regards of speeding up exhaust gas velocities? Oh, and its the stock turbo, I plan on porting the wastegate.
Thanks,
-Rob