my gen2 DIY snorkel and ISR mod (pic heavy)

[turtl3tim]

g'day all,
thought I would share a few pics of my el-cheapo bunnings isr mod and diy snorkel for my gen 2 4runner (vzn130). the ISR is finished and the snorkel is all but done, just need the brackets to be screwed on, and the external pipe to be painted in matt black

I may write up a diy for the snorkel, but it would be a bit tricky - all the different angles used could easily be set in the wrong orientation by whoever is doing the install, and then it would turn into a similar-yet-different diy snorkel lol. I used solid pvc pipe and numerous bends because I'm not a fan of the corrugated flexi tubing, and I wanted the snorkel to follow the body lines of the 4runner without just using silicone/rubber bends and having hose clamps everywhere and forcing it to the angle I wanted.

anyway...

The ISR mod (ISR stands for Intake-Silencer-Removal, for those who don't know)






The snorkel in progress

[ltd_v8]

looks awesome. did you still get to keep the antenna? also how did you route the plumbing for the steering up valve?

[turtl3tim]

I had an aftermarket antenna which I needed to move due to the big knuckle on the base of it, but I reckon there would have been enough clearance for the original antenna. I'll upload some more photos soon, showing clearances and whatnot of the finished snorkel when the paint dries. the plumbing for the p/s idle valve stayed the same, I plumbed it back into the first coupling on the intake pipe. refer to photos 4 and 5 before the snorkel photos start

[turtl3tim]

couple of internal brackets

had to heat and bend the front elbow so the indicator would clear

the top bracket


the clearance for where the factory antenna would be (I just put a grommet in the hole)

all finished




it's even got its own filter which is just one of the stainless mesh insect/leaf inserts that you can get from bunnings...fits straight into the 90mm pipe

[ltd_v8]

one more question what size piping and what rubber joiners did you use cause im about to start this very soon

[turtl3tim]

You will need-
for the ISR:
1x 1m length of 75mm tube
http://www.bunnings.com.au/holman-75mm- ... e_p4770101

1x 75mm 45deg female/female fitting
http://www.bunnings.com.au/holman-75mm- ... w_p4770279

1x 75mm 45deg male/female fitting
http://www.bunnings.com.au/holman-75mm- ... w_p4770311

2x 'deks' 65mm rubber couplings with clamps (they fit over the 75mm pipe with a bit of effort)
http://www.bunnings.com.au/deks-industr ... r_p4730706

1x 1m length of 1/2" vac hose

1x 10mm-13mm straight barb fitting from the retic section
http://www.bunnings.com.au/holman-13mm- ... r_p3120092

1x 10mm-13mm 90deg barb fitting from the retic section
http://www.bunnings.com.au/holman-13mm- ... w_p3120094

4x 11mm-18mm small hose clamps to fit the vac lines

[turtl3tim]

for the snorkel:
1x 3m length of 90mm pipe
http://www.bunnings.com.au/holman-90mm- ... e_p4770094
1x pack of 20mm tek screws
http://www.bunnings.com.au/zenith-12g-x ... k_p2420336
1x pack of 90mm downpipe clamps (the clamps with legs cos you will be bending them to suit)
http://www.bunnings.com.au/kinetic-90mm ... k_p4920094
silicone to seal and pvc glue to fix
now... the fittings (I will do my best to get this right for you, I made about 6 trips to bunnings just to play around with different angled fittings... I didn't want to buy 10 of each to start with lol)
1x 80mm-90mm straight coupling (this is for the airbox adaptor)
can't find a link for this? but I did pick it up at bunnings...it was a misplaced item just randomly lying on a shelf in the plumbing section??
3x 90mm 45deg male/female
http://www.bunnings.com.au/holman-90mm- ... w_p4770313
2x 90mm 45deg female/female
http://www.bunnings.com.au/holman-90mm- ... w_p4770211 ...disregard the picture, it's incorrect.
2x 90mm 22.5deg male/female
http://www.bunnings.com.au/holman-90mm- ... w_p4770312
1x 90mm 22.5deg female/female
http://www.bunnings.com.au/holman-90mm- ... w_p4770309
1x 90mm 90deg male/female
http://www.bunnings.com.au/holman-90mm- ... w_p4750159
1x 90mm 90deg male/female
http://www.bunnings.com.au/holman-90mm- ... w_p4770310 ...again, the picture is wrong
1x 90mm mosquito screen.
http://www.bunnings.com.au/rain-harvest ... n_p4815249

I did buy some 15 degree bends as well, but I don't think I used them.
this is the order I used the fittings in, starting at the airbox and working back (notice the orientation of the 'm' and 'f' representing which way the fitting was used. I only used one back to front at the very end of the snorkel because the 90deg male/female fitting has an extra bulge in it for some reason, this made it stick out further and didn't look too nice, so I used a 45deg male/female back to front so that I could use a 90deg female/female for aesthetics)

80-90mm straight adaptor into- 45m/f- 22.5m/f- 90m/f- long straight section of pipe- 45f/f- 22.5m/f- 45m/f- medium straight section of pipe- 45f/f- short straight section of pipe- 22.5f/f- long straight section of pipe- 45F/M- 90f/f- mosquito screen.

I had a bit of 25mm flat galv laying around which I used to make a sturdy bracket at the top. general tools you will need are measuring tape, masking tape to hold pipes in place, permanent marker to mark the orientation, drill and drill bits, hammer, and vice, grinder, hacksaw, holesaw, zinc paint to prime the exposed steel...so on so forth. OH! and a stovetop to make the indent for the indicator clearance on the first 90deg bend...mine's electric but it still worked, just put a bit of baking paper down first LOL!

I glued 90% of the joints and siliconed 3 so that the snorkel can be removed if need be. I siliconed the joint coming through the exterior guard, the 90deg elbow going through the inner engine bay panel, and the adaptor into the airbox. everything else was glued. and a word of warning when glueing them together... do it quick! the pvc glue sets extremely quickly and it threw some of my lengths out a little because instead of seating against the lip inside the fitting, it got stuck/set, 1/2 - 3/4 of the way in. have a rubber mallet handy, line it up, and smash it on! I gave mine a light sanding and painted it matt black at the end. I used rust-oleum because it sticks to pvc the best apparently.

that should be enough info to get you by for now...if you need anything, hit me up.

[ltd_v8]

hey mate well i went to go purchase some 75mm tube and bunnings don't stock it anymore would 65mm do but the problem with 65mm there is no male to female 45 deg pipe so what do you think is the best to do

[Peter Aawen]

There's no denying that this is an innovative & a pretty well executed DIY ISR & snorkel, and all due praise & appreciation for that!!

But I'm sorry, it's always gonna look like a 'cheap' job whatever stormwater or sewer pipe you use or whatever colour you paint it!! So why not go 90 mm pipe all the way?? Any restriction &/or reduction in pipe dia between the snorkel head & the air inlet manifold will reduce the potential for maximised airflow & the accompanying benefits, & honestly, IMO if you are going to be using stormwater/sewer pipe then the whole thing has absolutely nothing going for it in the looks department, so you really need to maximise any & every other benefit you can get from it, so at least try to use the largest dia pipe you can get!!

[ltd_v8]

i did have a thought on 90mm but wasn't sure if there is enough room

as for the looks department who cares its a 4wd its always going to get down and dirty and as long as it does the job does it really matter what it looks like?

also if useing a 90mm pvc pipe then it may increase fuel economy seeing as the vzn130 engines are really lacking most i got from my tank is 480 and thats with the needle right under the E but my fuel float could be sticking aswell

[turtl3tim]

r u serious? bunnings doesnt stock 75mm pipe anymore? WTF!?!...onto the next hardware i guess, but i just cannot fathom that. so does that now mean that everyone will be using 90mm around there house unless they use the rectangular stuff?

ltd...u got 480 from a tank!?!? i got 350 to E and filled up! im hoping that since ive done all these upgrades -new o2 sensor, 2.5" exhaust, 4 hole flamethrower 8% increase injectors, k&n filter, 7mge coil upgrade, 7mge afm upgrade, 7mm leads, plugs gapped to .041" and timing set to 15deg...things will improve greatly.

peter...for what it is, i personally think it looks great, and i didnt want to spend $300-500s on a snorkel for a car that cost me 2k. i went the extra mile and sat there for 30 mins to cut and file all the casting numbers/lumps and bumps off of the pipes so its alot smoother...not that u would actually be able to tell unless u got within 1 foot of it and eyed it over. as for the restriction side of things. none of it really matters when u look at the size of afm and throttle body, they are both massive restrictions. ive just finished fitting up the afm from a 7mge, which is a very worthwile mod with near on a 30% increase in flow area, and after doing some research on the bored throttle bodies...theyre not worth the time or money...and the next restriction is the inlet manifold itself.

given the snorkel is such a long piece of pipe, the bigger the diameter, the better...more of an air reserve that way.

[ltd_v8]

yeah man and all i did was put new spark plugs in put a new o2 sensor on and i still need to do the air filter and fuel filter they look like crap

the previous owner did timing belt kit dizzy cap and rotor button and put extractors on with a 2inch pipe or 2.5inch with high flow cat rebuilt heads and im running 31's and everything else is stock

[ltd_v8]

so i just did this on the intake only i have not done the snorkel but i must say it revs smoother and there is abit more of a pick up and it has used a little less fuel