25 replies to this topic

[Erik Hardy]

I'm not a pro-engine builder...so I can only share my results for my home NA1.8. Pulling the plate at Mid-Ohio was worth ~1 to 2mph down the straight, which if you look at Jason's graphs equates to 4-8hp left on the table from the plate. Maybe some of you builder folks can pipe up here and help with some top-prep data. 

[Bench Racer]

Is this the same Tom Sager that picked on my a$$ to no end about the 1.6 requests for improvements?

[Tom Sager]

Is this the same Tom Sager that picked on my a$$ to no end about the 1.6 requests for improvements?

Yea, it's my turn.  I was polite enough to let you go first (and quite often).  

[Bench Racer]

I'm from the show me state. Please post the 1.8 short comings and the solution/solutions and if believable I'll write a letter.

[Ron Alan]

I'm from the show me state. Please post the 1.8 short comings and the solution/solutions and if believable I'll write a letter.

Believable and evidence seem hard to come by in your state...but it seems to work if you are a short on morals DA 

 

Good thing i like you David! Ya know? 

[Dave D.]

"I've heard rumor the 47mm plate is nearly no longer the intake bottleneck of a pro-built NA1.8, thus implicating the airbox and intake piping.

I'll have my setup on the chassis dyno this off-season to confirm (yanking the plate outright) but it may not be as simple as we've thought to get "more" out of these motors as others."

 

If you can rig up a Vacuum/MAP sensor to the intake pipe on the dyno, you can find the bottleneck. Theoretically/usually, if the intake duct was not a restriction, you should see barometric pressure, not a vacuum.