I4 tuning box development - who wants one?

[675430VME]

Well the JB4 is out https://www.gregsraceparts.com/prod...pIPJPkrSFWsZsKZoby_aem_cRux6FJ62ZWuKAZfFeLpTg

View attachment 63836
That's would 519bhp on 93 mmm

May I ask how did you come up with 519bhp?

 

[RoryBellows]

May I ask how did you come up with 519bhp?

The 93 tune is 444 at the wheels. That calcs out to a 15% loss between crank and wheels which is a pretty standard assumption for loss.

Interestingly though they got 387 at the wheels for the base tune which is only a 4% loss if they are actually 400 at the crank. Applying 15% to the 387 is 455 which I don't think is realistic either. No way Lotus is giving out an extra 50hp without claiming any of it.