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.

 

[675430VME]

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.

You always compare from the baseline. Different dyno gives different result and drivetrain loss is always just an assumption.

 

[Rayjoedef]

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

Dynojet always records higher.

 

[TurboTambo]

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

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

Would be interesting to see how this goes on the 360hp cars.

 

[Lotus F1]

Yes I included the standard drivetrain loss to get bhp. Actually it may be less than the 17% I used to estimate as it is a mid-engine car. However that said it almost double what TDI got out of their system

 

[Lotus F1]

You always compare from the baseline. Different dyno gives different result and drivetrain loss is always just an assumption.

Yes exactly right