B B C 5 4 0 T W I N T U R B O Q U E S T I O N S

[hannes_slanec]

Hello, I would need some help with my 68 Impala with 540BBC twin turbo project I hopefully will introduce in the project thread soon.

How can give me some hints what leight and not tooo expensive turbo is the right one (trim, A/R, housing, size and so on...)

The turbo shall make not more than 6-9PSI of boost and not earlier than from around 3500-4000rpm (Redline is 7000rpm).

My expected HP rating is around 1000HP, I would like to reach a 3,5sec 0-60 time.

My compression is not that low with 9,2-9,5:1 (depends on the head gasket I will go with) but that car needs to be streetable and therefor the mileage is important.

7 or 8:1 would make the mileage suffering.

Also a nice cam advise would be appreciated, the car will go with a modified Vortec 7400 EFI.




Thanks in advance

Hannes Slanec