Turbo Upgrade

[k.rollin]

My application would be a L61 with the E37 (I think) ECM. That said, there is a certain engine speed at which there is sufficient exhaust flow to spin the turbo and produce positive manifold pressure (read boost). That's the number I'm looking for.

 

[Gtstorey]

That will likely have to come from someone that has ran it outside of a LNF or someone with a lot of experience with HP Tuners and playing with the LNF. I think I may have seen post on HP Tuners that indicated you can start "asking" for boost about 2600 rpm on the LNF.

 

[Indy Lonnie]

By boost threshold, I mean what is the engine speed at which you see positive manifold pressure with the stock K04?

I had my LNF dyno tuned at ZZ Performance. I see 24-25 lbs boost. It is all in at 3000RPM. I saw 360+ ft lbs at 3000RPM. A 5th gear pull will start boost @ 2000 - ramps up and gets crazy as the RPM increases. This is one of the reasons I need a new clutch - in a box in the garage. Soon to come.

Here is the link...

Here is an early run in the tuning... Engine speed (MPH) on x axis - see legend on middle right side.

 

[Scott #321]

On my stock 09 lnf max boost of 15psi (stock tune) came in about 1800 rpm. High gear pull starting about 1200 rpm.