Originally Posted by bushflyr
Yes, but look at the top of the plot from 4700 to 6000. There's only about 1psi difference. Throughout the rest of the plot the difference is 2.5 to 5psi or so. While it may not be completely scientific (eg. identical temp, baro, and humidity) to me, at least, it's a good indicaton that he's making boost significantly sooner when wrapped.
Dont think I mentioned this was using an MBC
Yes its not scientific but it is a good indication of how the car is spooling. No matter how cold it gets, its not going to account for a ~500rpm difference in spool up.
Intake temperature(speed density/blow through) on the cooler night was 46 degrees vs 57 from the warmer night. I had recently added a GM solenoid to my setup to take advantage of Ride5000's hybrid method of controlling boost and Im realizing now that some of the tubing I had to use was of different sizes and that may have affected the boost. I test drove it after the install and I had to adjust my boost back down becasue it was >25psi after this install of the solenoid.
Regardless, you can see how the spool is dramatically improved.
This is NOT a new concept and many have done it on any vehicle or engine use (ie generators). The documented down side: potential corrosion of your headers by retaining moisture, salts, etc. Spilled oil will also soak in to the wrap. The best, more effective option, although more expensive is to have them ceramic coated, at which time you can also port and polish.
Coating is better in terms of keeping the lifespan of your parts to a maximum. However, I am going to have to say that wrapping is a more effective way of retaining heat inside the pipes.
Case: Races XS on this board has a coated perrin header and recently went to a track day where he melted part of the plastic on his motor.
I can touch the headers on my car after a run and not get burned, if I try and get near my coated uppipe, I will almost certainly get burned.
I know its not new, but I have not seen documented proof that header wrap decreases lag, so I figured Id add it.