Write-Up: Building a Custom PVC Fenderwell Intake

ok i need to fin a 3.5 to 4 in reducer and I cant

Expensive: www.stylinmotors.com

I would think you could find a rubber one at one of your local hardware stores, might have to shop a bit.

a bit cheaper...

http://www.siliconeintakes.com/index.php?cPath=2&osCsid=c295290d351294c87c9fcb1257f23b23

i went to home depot and ace hardware

the two best friends your car ever had....

would a 4 in to 4 in work if o clamp the shit out of it
cause the actual measurments of the outside pvc is 4 1/2 and the intake is 3 1/5

you're trying to put a 4" id coupling on a pipe with an od of 4.5"?

its 4 pvc so when you by the rubber reducer its still 4in

But is the 4" PVC the ID or OD?

SuperRiv07 wrote:

would a 4 in to 4 in work if o clamp the shit out of it
cause the actual measurments of the outside pvc is 4 1/2 and the intake is 3 1/5

I seriously doubt you would get a good seal on the TB with a 4" rubber adapter clamped down on the 3.5" TB. Don't do it.

PVC pipe labeled as "4 inch" refers to the ID. I see the issue. Your adapter will need to be greater than 4" ID on the tubing side, since the PVC has an OD greater than 4".

Ideally you spend a fair amount of time test fitting assorted parts at the store before buying. I did a lot of this, piecing stuff together for both a 3.5" and a 4" PVC setup, both of which I shelved once I latched onto the 3.5 SS intake.

ok well I got what i got and Im abnout to undergo contruction and im gonna attempt the ramair idea from this thread https://rivperformance.editboard.com/series-ii-engine-transmission-f4/write-up-installing-fwi-filter-heat-shield-air-scoop-t1209.htm

and then im gonna install the 180 thermostat and cooler wires and plugs and then im set for the 3.4 pulley that should be here by next week im hoping

Unless you have a scanner, I'd strongly recommend not installing that 3.4. Those planned mods are no guarantee of readiness for a pulley drop. I'm running a stock 3.8" pulley with my mods, and have up to 6deg of KR on moderate acceleration. You just don't know w/o scanning for KR.

well im also adding a 3 in down pipe as soon as that gets here, then im gonna find someone around me so scan it for me

1998 Riv wrote:

Unless you have a scanner, I'd strongly recommend not installing that 3.4. Those planned mods are no guarantee of readiness for a pulley drop. I'm running a stock 3.8" pulley with my mods, and have up to 6deg of KR on moderate acceleration. You just don't know w/o scanning for KR.

I second this. Take some GOOD scans, before and after. Also beware, the 3.4 in the cold winter will push a lot more air, possibly generating more KR. I always raise pulley size in the winter.

If you think just a DP is enough to run a 3.4, I think you'll be disappointed. Try starting with a 3.5, seriously.

I've actually read many comments that cold winter air lets you run a smaller pulley than hot summer air. I see a lot less KR here when it's zero, than 80deg in summer, with the same size pulley.

well I got a truck that i drive in the winter and if i had to drive my riv im getting the 3.4 pulley that i can change up or down in like ten minutes you know the intense one

but yeah i need some one to scan now and after just trying to find some one

You might have better luck finding someone in your area with a W-body, try posting on www.regalgs.org if no one here is able to help.

yeah i willhave to keep that in mind

well im on break cause my son woke up but i got the reducer on and the first 45 and realized i only need the 1 45 deg and 1 90 deg and a 8 inch straight and im good staarted cuttting the fender to fit the 4inch pvc through i will finish when my wife gets home, im super excited about this though

Cool, glad to hear you're making progress!

yeah i would have finished but it started boring here like a son of a bitch so i will finish cutting and installing tomorrow im also going to install a piece of aluminum around the hole that i cut for the pvd to go through, and install scoop underneath to forcer air into the fender well