I was going through the ZZP website and came across the single pass intake manifold.

Decided to read every thread on here about the single pass setup I could find.

But found not a whole lot on whether its a viable option for us.

Being a supercharged cav im trying to keep my charge as cold as I possibly can, and in the future I can smell a TVS.

So...is it worth the extra $300 over the dual pass...does it help enough to make it worth it?

Who is doing them now other then ZZP?(have no issues with zzp just like to know options)

 

Not worth the extra money. You are better off gettting the zzp IM SPACER!!!

 

^^ definitely get the phenolic spacer

 

Been away from the boards for most of the year, where is the proof of the phenolic spacer being super beneficial?

BTW, single pass is better than dual. $300 better? Maybe not but it's the better option

 

Ya I second most people's opinion. I'm purchasing the dual pass / phenolic spacer this winter to put on with an OTTP HE and option B.

From what I've heard, single pass isn't necessary unless you're planning on going nuts + autocross regularly

 

Ughhhhhh. This is my car in the video by the way.

Cobalt ss sc- ait2 temps with zzp phenolic spacer - YouTube

 

I have the dual pass, option b, ottp front mount, meth and a phenolic spacer and with a few 408hp pulls I maxed 88 for my IAT’s. The phenolic makes recovery time almost instant

 

I plan on doing the spacer as well. The problem is cavs tend to not handle the knock as well as the cobalts so im trying to do whatever I can to cool the charge down.

It wont be a autocross car. If anything its a spirited daily driver and maybe maybe a couple track runs, but that being said I want to keep the charge as cold as I can.

 

unless your road racing the single pass is going to be overkill. go with the dual pass setup, it will work fine. the temps you will reach with spirited driving with the dual pass arent going to cause hardly any knock at all, however meth injection is your friend. if you want to make sure you wont get knock, meth is the way.

 

^^Once im off the reflash ill be going hard with the meth as well.

 

euthanasia does both the single pass conversion and porting and polishing of the intake manifold. the answer is all. do every mod there is. once you have them all, you can smile.

 

^^ not sure if thats a fictitious comment or not.

I just want to do it right the first time.

 

im not making a joke. buy parts you wont ever have to upgrade. you dont yet know how much power you want, trust me, you wont know it until you have it so buy the best part of each part one step at a time.

 

Are you running a single pass?

 

He will be im doing the single pass conversion for him.

 

i had run fmhe, dp, option b, spacer. this was fine for some, but the intake manifold itself is one of the major choke points of the car, its restrictive and its efficiency is limited, by porting and polishing it and converting it to single pass, it can be greatly improved.

 

This is true. You can screw up the IM by enlarging the slots, and single pass with 2 ports dont match the dual pass for iat2. Do what sharkey says, its the best way. 4 port Single pass IM were first developed in our Raceshop in 2004, I run one. Single pass are Only for the true die hard with track time in mind.

 

^^Ya I actually seen you started making them ages ago in my searches.


That being said...why would a double pass be better then a single pass, when a single pass is better for road racing and such.

Not trying to argue just learn.

It would seem if something is the best and good enough for hardcore racing there would be a benefit to running on a dd? Guess im just not understanding.

f it helps my goals are the 300whp range. Which blower im not sure but probably the tvs over the m62

 

dual port (i in i out) is hardly better if at all than dual pass. the ones he makes are 2 in 2 out. much better coolant flow, and better performing than "another company's" design

your right, its just how much do you want to spend

if all you want is 300whp the heaton is all you need

 

euthanasia's port and polish on the intake manifold adds immediate power in the form of improved efficiency but this only part of the math, a choke point holds a engine which is just an air pump from reaching its max efficiency, so if you ever decide to run a tvs, a ported and polished manifold will be better able flow the air the blower moves. it is exactly the same principles as exhaust, putting a huge muffler on a tiny exhaust pipe gains a little, replacing the little pipe with the big one allows the benefits of the big muffler to be realized. its a flow that begins at the air filter and ends at the tip of the exhaust pipe, you need to look at each step allow the way and see where there is room for improvement. you dont know your goals yet because you havent achieved them yet. fast enough has nothing to do with dyno numbers, it has to do with the driving experience. some people like them fine completely stock. but if you have the itch for more, you dont know when thats going to go away, you wont till its gone. get the best part each time, that way you dont end up buying parts more than once. case in point, im running the gmpp exhaust atm, it sounds wonderful, but when the parts get back from porting and polishing it will be at its limits, i will need to buy a true 3 inch if i want to go beyond the ported blower to a tvs, had i of bought the 3 inch exhaust to begin with, i would not have to consider this at this point. the issue would not exist. so simply buy the best part for each system you want and when you feel the car is fast enough, stop. for me, i want her to do what my 10 second chevelle did, and i want her to do it the right way. i cut corners on my chevelle, i always joke that the car tried to kill me every time i drove it. few people feel the itch for more power beyond the 10 second range, a 9 second street car is something only the truly mad desperately need but the problem is... you wont know till your there. 13 seconds might be perfect, or 12... or 11... buy the best parts first, dont have to buy them twice. oh and make no mistake, my cobalt will run 10s. its just money after all

 

I thought the intercooler and end plate were single pass from the factory??

Please explain.

 

Every LSJ should be running a dual pass end plate and a Phenolic Intake Spacer.

If you got the extra cash, a Griffin stock replacement HE and Single Pass IM are also a good idea.

I love mine Phenolic Intake Spacer. I tuned a car Friday with just a dual pass and PI spacer and the difference between his IAT1s and IAT2s were between 8-13* under normal driving conditions.

 

You gonna start making those again?

 

I got one in stock. Not sure to tell the truth. Lot of work. little return lol

 

it should be named Hardcore IM single pass =p