Would it be okay to use an HKS GT3540 Turbo on a B18C5 block with 9.1:1cr..or is the turbo too big (too much turbo-lag). Also would moving to a smaller turbo HKS GT3237 be sufficient in producing 500-550 whp?

 

Normally I could help out with this, but I know squat about HKS turbos. What are they roughly equivalent to compared to Garrets and Turbonetics?

 

umm the GT turbos are made by Garrett for HKS..these are HKS' ball bearing lines of turbos

i honestly have no clue as to what the numbers mean..just know that the larger the size..the more flowing characteristics and larger the trim size of the compressor

 

i own a gt2510, plus im good friends with hks, so i have specs on the turbos

your looking for max power of about 400-500 hp right, soo let me see
that would be

turbo theres 3 different compressor trim levels
gt3037(420hp)-48
gt3037(440hp)-52
gt3037(470hp)-56

turbo has 2 different trim levels
gt3037s(450hp)-52
gt3037s(480hp)-56

turbo only has one trim level
gt3040(500hp)-50

turbo only has one trim level
gt3240(580hp)-54

all these numbers are turbo specs, there are other turbos in this list but i was goin for the highest power cause thats what you asked for. you should factor in that the car makes a certain amount of horsepower, but its not going to superceed the turbo.

 

What is the fastest spooling (for a GSR) HKS turbo in the 300-350hp range?

 

in the hks gt line

gt2530(320hp)trim - 63

gt2535(340hp)trim - 56

gt2540(350hp)trim - 46