# Turbo talk. **URL:** https://forums.speedlife.net/t/turbo-talk/260105 **Category:** Shift518 Automotive **Created:** [August 22, 2011, 2:25pm UTC](https://forums.speedlife.net/t/turbo-talk/260105 "2011-08-22T14:25:35Z") **Posts on this page:** 1 **Showing post:** 57
### Author: ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid) #### Post date: [August 23, 2011, 9:06am UTC](https://forums.speedlife.net/t/turbo-talk/260105/57 "2011-08-23T09:06:03Z")
> [@FS: 2001 Jetta 1.8t](https://forums.speedlife.net/t/fs-2001-jetta-1-8t/44820/7): > > Can’t wait to see twins on 12.5:1 compression…killing me. > [@S13 Coupe Build | Last Update: 20-May](https://forums.speedlife.net/t/s13-coupe-build-last-update-20-may/43006/77): > > Because with enough boost to make it worth while you will lift a head. Timing would be almost non existent, maybe 10\*, the internal parts in his motor aren’t up to the task of boost…lets see…what else. > > I agree with the more compression, less boost argument…but on a Gen III it’s not a good thing over 11:1…and 11:1 is pushing it. whats worthwhile? 1000HP? if so nope not worth it, should have built it from the ground up with that figure in mind FI. 700Hp, large single, 7-10psi should put him close to that right? and yeah I agree, compression is just a number, each motor and their designs are completely different so its irrelevant until those design specs come into play. food for thought: LM7 5.3L with stock heads and stock HG is 9.5:1 LM7 5.3L with 243 heads and stock HG is 11.0:1 LQ4 6.0L (stock dished pistons) with stock heads and stock HG is 9.5:1 LQ9 6.0L (stock flat top pistons) with stock heads and stock HG is 10:1 LQ9 6.0L (stock flat top pistons) with 243 heads 11.5:1 8-10 psi (76MM) on the lm7 will get you 500hp with a junkyard block. 8-10 psi (76MM) on the lq4 will get you a bit more with a junkyard block. 8-10 psi (76MM) on the lq9 will get you a bit more but you better have good head studs. 8-10 psi (76MM) on the lm7 & 243’s will get you 600hp+ with a junkyard block but dont go nuts with the boost. yeah you see the trend. and are right. I wouldn’t be pushing it past 11.5:1 compression FI. unless you run like 5psi or something. and most large frame turbos like to spool up to be in their efficiency range. --- _[View the full topic](https://forums.speedlife.net/t/turbo-talk/260105)._