Any diagrams of the B4 layout in terms of headers and up/down pipes? How about a 911 Turbo since it has the flat 6 config.

Surely with turbos of different size the turbines would be spooled from all four exhaust ports?

Short headers with low flow/temperature losses and use of pulse spooling effect would be nice. Implications of firing order and engine balance?

VOD/overspool issues could surely be overcome if you use the right turbo and control systems? How does Porsche do it?

2 low down turbos on short headers would surely have to be the same size without crossover, and most conventional turbos require gravitational oil drains, also where to fit?

 

twin turbo according to pat was not such a good idea..

Pat is your best bet to speak to about the up pipes and down pipe.

Sit one single turbo where the tmic should be.. equal length up pipes.. One turbo..

Or twin turbo at each side of the block..

Wouldnt go for direct on the headers due to the clearance issues..

David

 

Arent you?

Supppose it depends what you want really..

There are other ways.

Are you planning on running Sequential / staged or whatever its called?

If you are only going for 450/450 then I dont think you have a problem... if you are going for 800+ then maybe you need to consider other options..

What turbos where you thinking of? Two front entry TD05's no doubt?

Would this mean twin maf as well with your std ecu ideas???

Can you remap the b4rsk?

David

[Edited by David_Wallis - 4/8/2003 3:04:40 PM]

[Edited by David_Wallis - 4/8/2003 3:05:03 PM]

 

Think the B4 ECU could be mapped. Would be nice to have something that has a 911 Turbo sort of torque range without the capacity. Cake/eat 20G is nice but surgey below 4500 on 2.0, maybe 3500-4000 on 2.33?

Would go MAP for twin turbo I would think?

 

twin turbo unit is a single physical unit. I think it's a single casting for the exhaust housings with the flapper in between.

Personally i would steer well clear, spend the money on a 2.5 or something.

Mazda RX-7 TT uses a similar setup as the B4 with second turbo phased in in parallel with 1st.

btw John, mail me with your plans re pistons, CR and skimming.

Paul

 

I have an almost brand new Sprintex supercharger if anybody fancies that idea although the dearest part of the conversion lies in the pipework due to the limited amount of castings unless of course 100's want the conversion.

Hey what a car that would be allowing for a rather large turbo spooling at 4000 rpm.

 

Well without one of twin turbo, supercharger or considerably more than 2.5 litres you aren't going to get a big power car that does a lot low down? I suppose hence Pat's 3+ litres

With no twin scroll, VATN, and no magical compressor which has a vastly wider operational range than a 20G I suspect anything sub 2.5 over 450 BHP would be borderline street tractable? Depends on preference?

[Edited by john banks - 4/8/2003 3:13:26 PM]