Should I remove the stock IC flow cover/box? I see some others take it off. To be quite honest, I think I'm the only one that still has it on! I've included a photo of my engine with it on. See link of what I'm talking about with it off: http://www.rx7store.net/PhotoGallery...pexi+Intake+FD

 

Absolutely! BUT, you need to open up your stock airbox and make a shield so it sucks cold air from between the radiator on pax side frame rail. Also, be sure and seal the holes left on intercooler duct and top of the airbox. Finally, seal the hole in the duct leading to the battery. This will keep air moving through your intercooler unlike the stock arrangement.

Reason being, the stock intake routing will actually suck air backwards through the intercooler at high rpms!

 

He doesn't have the stock intake box...

Yes, I would suggest that you remove it and cover the hole that will be exposed in the IC duct.

 

Whoops, just saw that. Honestly I think the modded stock box w/ K&N is better than breathing hot air off of the radiator.

 

I see. I will remove the box with the top opening covered or modded. I could've remembered Racing Beat made a stock-mounted (or least it looked stock) IC flow duct...I can't find it on their site now. I'll try to look again and other places. Thanks again everyone. =D

 

Here's my duct with the cover that comes from Pettit racing. Let me know if you want one of the covers. Jack

 

Is it safe to cover the hole infront the battery, thought battery had to be kept coolish?


Here's what I did last week, vast improvement from sucking in hot air from the coolant rad. Covered top hole and cut a hole down the side too. Holds boost better when it's hot now.

 

I don't know about your battery but mine sits up againt the opening any way so I doubt any air gets by it any way. If there's clearance between the battery and the opening then it probably helps some

 

My battery currently sits right next to the AST and intercooler..almost touching. Anyhow, will look into aftermarket ducts for my stock IC until I get a real deal IC from Apexi or Greddy. I'm not a fan of "too much CF" but I've seen CF IC ducts too which could be something I look into. Corksport carries a CF stock airbox integrated into the IC duct combined for $1500.....eh, a lil' too much.

 

I've also been looking to see what kind of things are available to cover up the square hole left on top of the stock intercooler shroud after stock intake is removed. I currently have it covered up with tape..but want something better! I plan on getting an ASP Med IC soon...but until then I need to cover up the hole.

 

See if you can get your hands on one of these plates. They are very cheap and can seal up the square hole fairly well with some foam single sided tape.

https://www.rx7club.com/showthread.php?t=424184

 

Before I joined here I was thinking of ways to reduce intake temps without changing the stock IC. I tried covering the top hole with tape, to force the cold air thru the IC and not escape thru the hole, didn't realise it was popular!
Anyway, it was a slight improvement on having the hole open but not much.

So next I made up the alloy plates as in photo above and cut out the side of the plastic box, now that gives a noticeable improvement - when the engines hot I dont feel any lag thru heat soak hardly at all.
Boost at WOT in 4th was upto 0.8 from 0.7bar.

 

Major thanks. Not sure if the seller is still making/selling them but I PM'ed the guy anyhow. Thanks! FDZ

 

I wonder how much that piece helps to direct air thru the intercooler as opposed to over the top of it. might be worth keeping. If you have a PFC you could roughly test the air intake temps.

 

It's not going be much help at all in dirrecting the air through the intercooler if your not running the stock air box. The resistance of the stock air box is what helps the air go through the intercooler as the air through the duct is shared buy the intercooler and airbox intake. If you remove the stock airbox you need to block off the duct going to the stock airbox.

 

Agreed.

Having proper ducting would reclaim the effect of the intercooler that is lost. Without ducting it becomes another version of the infamous interheater. The stick IC is not so great on the track, but is functional for a acceleration run or two before heat soak occurs. Without good ducting, well, it just heats the air until the heat radiates off.

 

Just got an e-mail response from seller. The seller is still selling those duct covers if anyone is interested to know: https://www.rx7club.com/showthread.php?t=424184