Hi all, I purchase a 4-inch stainless snorkel and airbox from Radius fabrications last Thursday. I was wondering if anyone has installed an aftermarket airbox to there factory 1hdt turbo. From my measurement, the turbo size is 70mm and my airbox is 4 inches. Wondering what sort of bend's and tubing you guys have used to join it all together. Also what you've done with the factory sensor I believe it is that plugs into the standard airbox.
So I just got done fitting the TORFAB airbox to my 1HDT with G Turbo Green Wheel running 20ish psi. The box shipped with a 3in outlet to the turbo and 4 in inlet drawing from the fender so I had to go out and get a fab shop to make a different front plate to make it a 4in outlet. I was worried about still leaving efficiency on the table with a 3in outlet as it seems the best is 4 in and 4 out. The results are nice and I'm very pleased other than having to get a 4in outlet made myself. I was led to believe because of the previous conversation on this thread that the box was already 4 in and 4 out.
Obviously there was no scientific tracking going on but I'm fairly certain my EGTs dropped 50-100 degrees overall and before I could hit 1250 with ease and now I'm pretty stable at 1100 with my foot in it hard. Boost before the box was set at 18psi spiking to 20-21psi and now not touching fuel or the boost controller I am now boosting to 22-24psi (im guessing due to the amount of vacuum created by the stock airbox). This was the last piece to my puzzle before I go to a much larger turbo.
This was the box with 3in outlet.
Here is the box after the new 4in outlet was made and pipework fitted. Also as you can see the new plate has a barb so that I could continue using my Racor catch can. I was initially worried the silicon elbows may collapse under boost but so far it has not. It must be flowing quite well. Much more compressor noise can now be heard which puts a smile on my face.
It has a 2.75 to 4in silicon elbow at the turbo + a small piece of metal 4in joiner pipe with a slight bend + 4in 90 degree elbow at the box.What did you do with the piping from the box to the turbo, completely silicon? did you reuse any of the oem pieces? Its a great looking compact piece