|
Those 2 turbos are not in the same league. Maybe something inbetween?
Cams make turbos spool slower, BTW. A 5k spoolup on a 4th gear pull would be considered very laggy. Your normal T3/T4s are going to spoolup around 3800-4000 on the street in 4th gear on a 8.5:1 comp 2.0l. Your T25 probably spools around 2500. A 14B spools around 2800. A 16G around 3000-3200. Judging by Nash's dyno charts I would guess his old 20G would spool around 3400 on the street in 4th gear.
Gear makes a huge difference on spoolup RPM. The higher the gear, the lower the RPM the turbo spools at. A turbo that hits decent boost at past 5000 in 4th gear might not be able to even reach full boost in 1st gear at all. I had a very laggy setup on my car at one point. It didn't reach full spool until very high 4000s. In order to keep power going and boost up between shifts in the lower gears you had to shift it extremely fast and concentrate on the shift. If you only shifted very fast, then you lost so much of the spool that you had a decent amount of nothing in the next gear. That is one area though where dual ball-bearing turbos make a big difference. They don't help an extreme amount on intial spool, but between shifts they retain most of their momentum and spool right back up quick even if you don't keep the gas to the floor during the shift.
A 4G64 is going to make a decent difference in spoolup though. A 50-trim spools ok even on a 7.8:1 compression 2.0l. On a fresh 8.5:1 comp 2.4l you should be able to step up to something a bit bigger and still get good spool.
|