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

 

[star3758]

It was a T45
However a friend mech of mine said that could be that the bit may be slightly thinner then what's sold here although the same size technically . There was also another needed to remove the ac that has a torx bolt. That was wrong as well. I think it said a 10 but it was a 12.

Could I ask what type of ratchet wrench you used?
I attempted the installation today, but I found it very difficult to access the pulley with a ratchet in order to release the AC belt.

 

[Rayjoedef]

Renntech now has a unit. Call Mitch, he'll give you the details

 

[Lotus F1]

Could I ask what type of ratchet wrench you used?
I attempted the installation today, but I found it very difficult to access the pulley with a ratchet in order to release the AC belt.

It was like a mini breaker bar ratchet. A regular one didn't have enough leverage

 

[F1 SML8R]

Renntech now has a unit. Call Mitch, he'll give you the details

FYI, I found a video posted yesterday, but nothing on their website as of just a few mins. ago.

 

[Lotus F1]

Curious that the JP4 numbers are so much higher than TDI or Renntech

 

[Rayjoedef]

FYI, I found a video posted yesterday, but nothing on their website as of just a few mins. ago.

If I go with piggy, I believe I'll choose jb4....they've been great in the past. Side note.....I was doing full throttle runs in track mode last night and I can't believe the sounds coming from the blowoff valve and waste gate.....a piggyback and updated bov would make the turbo exceptional!

 

[Lotus F1]

If I go with piggy, I believe I'll choose jb4....they've been great in the past. Side note.....I was doing full throttle runs in track mode last night and I can't believe the sounds coming from the blowoff valve and waste gate.....a piggyback and updated bov would make the turbo exceptional!

I just ordered the BOV adapter from Burger Motorsports

 

[Rayjoedef]

I just ordered the BOV adapter from Burger Motorsports

looking forward to your build...

 

[steveoexige]

Curious that the JP4 numbers are so much higher than TDI or Renntech

Sales BS. Higher numbers sells more product. There is no way the JB4 box is making anywhere near the figures they are quoting.

 

[TurboTambo]

I just ordered the BOV adapter from Burger Motorsports

I have one installed. It's not crazy loud like other valves, but it definitely adds more to the theatre. You literally don't know what to listen too!! hahah

 

[TurboTambo]

Sales BS. Higher numbers sells more product. There is no way the JB4 box is making anywhere near the figures they are quoting.

Although, to be honest I expected way more power from the i4 with a tuning box. I don't have a clue how far these new style piggybacks can push things, but I've have similar power gains with 1.3 and 1.4 litre old school turbos with just a bleed valve!!!

 

[F1 SML8R]

I have one installed. It's not crazy loud like other valves, but it definitely adds more to the theatre. You literally don't know what to listen too!! hahah

No CEL's? Just louder venting sound? I wanted to make sure it didn't trigger an engine light.

 

[TurboTambo]

No CEL's? Just louder venting sound? I wanted to make sure it didn't trigger an engine light.

No CEL's or anything like that. Just a slightly louder, and a different kind of venting sound. It'll obviously sound different inside the car than outside. Those lucky pedestrians!