Ah yeah okay, have always done springs on petrols when doing high horse power, high revs makes sense.
Upgrading crank sounds expensive.
Search found 2 matches
- Thu May 23, 2019 4:20 am
- Forum: Engines and Exhaust
- Topic: Modding my 4jb1t for 250hp
- Replies: 56
- Views: 469
- Sat May 11, 2019 2:17 pm
- Forum: Engines and Exhaust
- Topic: Modding my 4jb1t for 250hp
- Replies: 56
- Views: 469
Re: Hi from USA, modding my 4jb1t for power.
Sounds like a fun project. Will be following progress. Just in case you haven't already dont it but will need to run a lot stronger valve springs running 38psi of boost.<br/>Looking forward to progress. <br/>I have a spare 4jb1t that I'll be stripping down and doing something similar and then ...