I have a question in ref to my 1982 Vette - does anyone know of a TRUE "Cold-Air Intake" for the Cross-Fire Electronic Injection engines as is standard on 82 Vette's??  I've upgraded to the dual K&N air filters, but received no noticable change in performance, so it looks like I'm going to have to bypass the open and closed loop management system.  Any help or advice on improving the force of air injection into the stock L83 engine would be greatly appreciated!! VetteMedic38415.5255324074

Come on guys!!!! - No one can help me with this issue??  I'm in a jam, 'cause besides headers, tru-dual exhaust, advanced timing and a performance chip, I'm really limited on how to get this thing to put out more!!!!  Hell, I've even removed the mechanical fan and water pump and replaced them with electrical so I can squeeze out a few more pony's.  SOMEONE out there has got to have some info on a good intake?!?!?  Bueller......Bueller.....??

Well I have read that the crossfire intake is fine for stock engines but sucks for performance, It is highly restrictive. That might explain why there is little aftermarket for the manifold such as cold air intakes. If it was me I would swap it out for a tuned port injection system or even better a miniram. If you are keeping the original manifold then, you might just try to fabricate a cold air intake, but it probably wont make a noticable differance in hp. The clog of airflow is in the manifold, not the stock air intake system. Tumarr38415.6419560185

If you took the intake off of a cross-fire, and looked at the size of the ports, you would wonder how the thing starts and runs at all. In order to get the setup to fit under the hood, they had to sink the intake down, and in the process, made the ports about HALF the size of a normal intake The real p**ser is, there's not enough meat on the intake to grind the ports out to fit the heads. This is why the cross-fires are OK until around 3500rpm, where the restriction in the intake starts choking the life out of the car. Ain't much you can do, short of changing to a TP set-up, and that requires a new 'puter & wiring harness, along with a few $$$$$$$

Even if the restriction was not the intake manifold (which it is ) Cold air intakes only help operation in the top end of the throttle AND Rpm range.  Up to about 80 or 90 percent max air flow at both WOT and engine Red line.  Then they help.

Thanks for the replys & IM's! - I think I'm going to go the TPI route.  Thanks again!

Brian

Whoww hang on.  There are some options.  Actually I have been thinking about doing a series of articles on how to get more power out of a crossfire engine.  Not that I have one, but I have been around people and listen to their complaints so I think it would be a fun challenge.  here is a reciepe that I started to map out for the crossfire.

Stage One

Add Headers, High Flow cats or remove, go to dual exhaust

Stage two.

Install modified weiand intake from a guy called X-Ram.  You can go there to the website to get more info, plus the cross-ram forum website for more details.  The restriction is the intake and not the heads.

Stage three - Kill the factory ECU and install a Commander 950 with an auxillary injector driver so you can drive two throttle bodies.  I believe you would need to get a transcontroller from TCI or Jet, unless its a 700r4.

STage four - Add Bigger Cam

Final Stage - Port Heads or bolt on aftermarket heads.

It really depends on how much you want the engine to remain stock looking.

Just my thoughts.  Of course some of this may be experiementing and it may be easier to just do a tpi engine swap.  However i feel like you should be able to pump 375Hp out of this combination.  We have a guy here at work with a C4 Crossfire setup and he has offered to let me use his car as a guinee pig.

Heres a hyperlink http://x-ram.com

There was a guy at C3X last year that had a red '82 vette with a Tuned Port Injected (Speed Density System) ZZ4 engine in it. Very clean looking setup. The hood shut no problem even with all that ductwork thats bonded underneath the hood for the crossfire system.

That car inspired me to TPI my car. I'm still aquiring a few more pieces needed to change it over. I even have the Nitrous Oxide system for it. Ebay has been good to me so far. lol 

Another manifold you may consider for more top end but not as quite as much low end is a modified LT1 intake from this site. Lt1intake.com The Tpi intake in its stock form is great for low end torque and mild cams, but falls on its face after 5000 rpm. It can be modified to increase its upper rpm performance but by the time you spend all the money, you could have accomplished similar performance with the lt1 intake. You can use most of the stock sensors, throttle body, ecm, and small cap distributor off a tpi set up. On that site it tells you what you need to do to make it work. Just another option on the intake.Tumarr38420.0446180556

Here is another source for information.

cross-fire injection

It has links to other information.