biiig-hp

biiig-hp

THANKS jEAN IT WORKS!!!

graeme36s

I noticed the weight difference when I fiited a set of aluminium centred BBS's. The rears are about 85mm thick and the fronts 100mm.

Geoffrey

I don't think BBS is producing the Mag wheels any longer, they have been replaced by the lighter, stronger spun aluminum ones. Looks are very similar.

WHB Porsche

biiig-hp, where does the MAF go? In that picture it appears that there is just a cone filter to the intake y-pipe.

sweanders

No MAF on a MAP setup.

biiig-hp

Right on the money. it is a map not maf set up. A lot of changes had to be mad to go this wrought. The only thing that I did not end up getting done on this engine was the Secan I.C.. I ended up with the Porsche motorsport I.C. instead due to not being able to strike a deal with the owner of the secan. No regrets with this one. according to my engine builder the evo cars rand higher boost with air restrictors that created a lot of heat. He assured me the motorsport I.C. would be more than enough for what I was doing with the car, and it seems to be true.

Jean

Biiig-hp

I agree with you. By now I have figured out (ballpark) that a RWHP/AWHP chassis dyno number is roughly equivalent to real flywheel HP numbers, instead of applying a correction to them. This is more accurate as soon as you move to modified engines. The way I have measured this is through an extrapolation of datalogged runs into HP and torque curves. On the torque front, that inaccuracy is even much larger and can vary greatly, much more than HP numbers, I don't have an explanation why but I am confident it is that way.

As far as your Motec setup is concerned, I know Holcombe is very experienced in them so I am sure it will run great, you are in good hands.

I am wondering why he chose to use the stock 2 into 1 intake route and one filter, instead of running two separate intakes, one straight into each turbo (with two filters). I am also wondering why my engine builder did not choose to use flexible intake ducting straight to the turbos from the GT2 wing side openings, instead of using two filters that are not optimally placed and absorb hot air from the engine bay, the same way as the stock setup also is not optimally absorbing fresh air..There is much more fresh air potential that we are not taking advantage of!

It would be interesting to see your intake temps the TB993T- way under a fast run with the Motorsport intercooler to compare the spreads.

Sorry this was a thread about BBS wheels.

WHB Porsche

Ok. Is MAP what's referred to as "pressure sensing?"

schnele

correct/\

biiig-hp

Reason for the stock air intake is I’m having a cold air intake box built that will feed off the two GT2 intake holes via flex hose directly to the one stock intake Much easier than two intakes. It may take a few tries to get it right and make it look good but I think it will be worth it in the end.

Come spring time I can give you guys all the data you’d like. For now I’ll send you what limited motec log I have.

Geoffrey

Jean,

We have experienced the flexible tubes collapsing under high air volume situations, perhaps Todd has experienced that as well.

Jean

Geoffrey

That was my initial thinking but there is a huge amount of different flexible ducts around, with different properties, besides those sold by race or automotive shops that are usually crush-prone, brake cooling ducts.

Also many suppliers of industrial vaccum applications ducts that withstand huge resistence to chemicals, heat, friction and crushing/suction all while being very flexible. Here is a link:

http://www.ducting.com/Industry.html


Porsche Motorsports sell also these intake ducts for the 993 GT2 race cars, but you will pay 10 times the price. The key is to choose the right sizes so as not to restrict airflow, but that is easy to calculate and will be in any case better than a stock setup or where my filters are placed for instance.

Jean

Biig-hp I really think that two intakes is a very simple setup and will save some weight as you get rid of that big aluminum (?) piece, you just need to duct the hoses from the turbo intake side, straight to the GT2 wing intake openings (you can use some connectors in between), and then place an air filter where it connects to the wing.. I can probably find some pictures if I search in my files, a Motorsports manual will show the parts as well.

96C4S

Big HP what part of canada are you from?