I had the same problem with a fully tuned Alto Works, but I found out that it was the fault of the racing intercooler. Put on the smaller one, and you'll see it'll rev up much faster.eddieturner2002GT3 did have noticeable turbo lag, well, if you used hybrids that is. On MK's I put the Stage 4 turbo on the Alto Works and changed the boost pressure line (it was called something different in the .ini) to a really high number. When I used it on GT3 it took about 30 seconds before it actually started to rev up, but when it did, it literally flew off the line.