I am trying to figure out the advantages and disadvantages of larger turbos. The obvious problem with larger turbos is that they take too long to spool.

Does anyone know the RPM range on the following turbos when they spool.

K24/18G
GT28s
GT3076
GT3071
GT35s

If anyone happend to have a dyno sheet on these turbos that would be very helpful.
Thanks

 

My K24/18G's (with fuel injectors, dual pumps and Proto MAF) spool instantly in full throttle acelleration runs. I have less lag than I had with the K16/24's. When I shift and hit the gas there is no delay - the car jumps instantly and pulls very hard - I am very impressed with these 24/18G turbos. I did drive some 24'18's without the fuel and it was different (more lag). A lot of it has to do with the tuning, also - it's not just the turbo. I have a very custom tune and the turbos respond exceptionally well. Of course, if you drop down to a very low RPM and hit the gas, there will be some time until you reach the power band, but who drives like that - I know I don't, except for an odd occasion in traffic or something and I get caught in the wrong gear.

When I see people wanting to stay with K16's for "no lag", I understand because I used to feel the same way. After using K16/24's for a year and desiring more power, I decided to take my chances and try a larger turbo. I was shocked at how responsive the larger turbos are. With my Protomotive programming and k24/18G's, I have less lag than with my previous K16/24 hybrids and it made me realize that my fear of the larger turbos was due to inexperience with them and a perception of larger turbo = more lag. In general, I think this is probably true, but Todd K wrote a custom file for my car that is so responsive, I was just shocked and very pleased with the final result. So from my experience, I have learned that larger turbos do not have to equal more lag.

 

ur asking a million dollar question....
too many variables to answer ur question. for example, someone with just a turbo, ecu, and a muffler will not spool up as fast as someone with headers, intake systems, airbox, big intercoolers, etc....