as far as twin vs. single... you guys are arguing sequential vs. single not twin. the rx-7 is sequential not twin and I believe the supra's are as well.. the tt thing is just a mis-nomer.
Sequential means that all the exhaust goes into 1 (usually smaller) turbo and exits into another (usually bigger) turbo... this allows the smaller turbo to provide boost at low rpm and the bigger one supplies more boost at higher rpm..) However what usually happens is that the smaller turbo becomes a flow restriction for the bigger turbo and stops the bigger from reaching it's potential.
Twin means that there are 2 identical turbos on the car one on each bank of exhaust ports... example is the 300ZX TT. twin turbos are limited only by there own flow. the bigger you get the more boost.. you CAN NOT RUN different size turbos in "twin" configuration.
And for a 302... you'd have a much easier install and tuning seasion with 2 (1 on each bank) instead of 1 turbo... you'd have too many pipes trying to connect the banks even out the pressure and then spool the turbo all while maintaining proper flow.
the reason people abondon sequential turbos is because:
1. 1 turbo is easier to work with and tune when they are sequential.. especially on a strait 6 or a rotory because all the exhause ports are running into both turbos (unlike a v8 or v6)
2. the smaller turbo whether mounted first or second creates a bottle neck reducing the flow capability of the other turbo.
A sequential turbo set up is
technically the best way to boost but it hardly EVER works out this way... there are too many variables to take into consideration to make it work efficiently, So people dump the complicated sequential for 1 big turbo and get lag but higher peak boost....
there are NO true twin turbo cars that I know of that ANYONE does a single turbo conversion on. (I'm sure it's happened but it's just not very smart)
on a v8 or v6 doing a single turbo is just a pain... and not really worth it... It's easier to just put "twin" turbos on (1 on each exhaust bank). This eliminates the problems of getting both sides running even and spooling 1 turbo... also the "twin" turbos would be smaller allowing them to A. be cheaper and B. spool faster.
If I were turboing any V configured motor (3.0L and up) I would DEFINATELY go twin over single monster. a single turbo meant to produce maximum boost on a 5.0 for example wouldn't spool up till like 4k... where 2 twin smaller turbos (1 on each exhaust bank) would spool up at like 2-3k and would probobly produce damn near the same max. boost as the single.
Oh ya and wrecking cars in movies is GAY regardless of if it's a 88 chevette of a friggin split window corvette... it's a waste and it hurts me to see.
And the bond movie cut a
Z8 not a Z4.
