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Old 06-07-2006, 09:05 AM
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1984 corvette crossfire injection change to 1985 TPI injection

Hey guys, I have a 1984 corvette with crossfire injection, I want to change to the TPI system they introduced in 1985, or some other type of intake system, but I kind of want the easiest bolt on situation without alot of mods, any ideas would be appreciated!!

(everyone knows you guys are the best!)

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Old 06-07-2006, 09:14 AM
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Quote:
Originally Posted by billybonesmusic
... or some other type of intake system, but I kind of want the easiest bolt on situation without alot of mods, ...
What is your budget?

IMO, the easiest for the money is a Holley MPFI system that uses their Commander 950 engine management system. Either a single plane or the Stealth Ram. But the SR may not fit under a stock Corvette hood.

TPI is a good route, but I would recommend still using the C950 EMS to control it in lieu of trying to go the DIY-PROM route. I can do both, but my experience is the C950 is very user friendly compared to doing your own PROM programming.

Here is a link to where I converted my Camaro's single plane MPFI system to C950 EMS: http://www.edgesz28.com/edgesZ28/engine.htm

Here is a link to where I installed a TPI in my 94' Suburban, where I do my own PROM programming: http://www.edgesz28.com/edgesZ28/sub...urban-home.htm

Good luck, Ed www.edgesz28.com
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Old 06-07-2006, 09:30 AM
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I still have my 83 Z28 (CFI 350/A4), and finally got rid of the CFI, only due to the plans for the car.....it ran flawlessly until a rod bolt decided to take a permanent vacation. If you want to build some more power on the CFI, check out www.turbocity.com- I picked up a lot of slick 'go fast' parts for mine there.

The intank pump will push approximately 11-14 psi, depending on the condition.

You already have a return line, so running either TPI or a carb is fairly straightforward. Plug and play for the most part.

I personally would steer you away from an OEM TPI setup, as it's all but done at about 4500 rpm, and it was also originally designed for a 305. If you decide to go with TPI for performance, I'd strongly recommend Accel DFI (SuperRam system), or at least an Accel Base, runners, and plenum or Edelbrock base and runners to get you started. You'll also need to replace your fuel pump with either an Aeromotive, etc inline unit that will push a minimum 44psi, or swap out your intank pump for a TPI unit from a TPI 'Vette- you might have to source/fab some hard lines to replace some of the rubber lines, although I would imagine that lines from a TPI Vette would work. Most of the wiring should be plug and play as well, as the only differences really were the harness, computer/eProm, and the physical induction system itself.

You can regulate the pressure down from the OE pump for a carb, but you will need to run a return styly regulator, otherwise the fuel pressure will deadhead at the regulator and eventually overcome it, causing some drivability issues.

At that point, your only worries should be hood clearance between the intake, carb, and a CAI/air cleaner assembly.

Hope this all helps....
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Old 06-07-2006, 10:12 AM
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I dont think the Holley Stealthram will fit under the stock hood of your Vette. You might look into using the Holley (or other good aftermarket controller) computer/sensor setup with a Mini-Ram (for higher RPM power) or the Accel SuperRam (for more mid power).
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Old 06-07-2006, 12:56 PM
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schweet

That Holly stealth system looks schweet, looks like all the plug and play stuff is there,
Includes Upper and Lower intake manifolds
58mm Billet Throttle Body
Clear Anodized Fuel Rails
Fuel Injectors
Fuel Pressure Regulator
255 L/hr fuel pump and fuel filters
Commander 950 ECU
All wiring harnesses
Software and communications cable
All Sensors
No EGR provision
Detailed installation and tuning manuals

the BIG prob would be fitting it under the vette hood, since its not like a camaro and could get a cheap fiberglass hood, maybe i could fiberglass in a hood scoop for looks, but doubt I could make it functional.
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Old 06-07-2006, 01:12 PM
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It could work if you got a pro stock, Raptor (4th gen WS6), or SS (4th gen Camaro) type hoods....fab up a ram air/CAI and voila! Git er done!!!!
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Old 06-07-2006, 02:28 PM
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sounds good

thanx Hawk Man, your stuff looks awsome bye the way, you must be rich! lol
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Old 06-07-2006, 05:50 PM
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There are a number of companies out there that make replacement hoods for the C4 vettes that have scoops or cowls on them. They look pretty wicked with a nice 3 inch cowl and that would probably give you the clearance you need.

You might goto corvetteforum.com and browse it to see if this issue has been dealt with before (which I am sure it has).
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Old 06-07-2006, 07:25 PM
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Doc here,

A Stock Ray Hood, with functional scoop SHOULD give you the clearance you need without cutting anything..measure twice cut once..

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Old 06-08-2006, 07:21 AM
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Quote:
Originally Posted by billybonesmusic
thanx Hawk Man, your stuff looks awsome bye the way, you must be rich! lol
Nope, that's not my 'shtuff' on the site- just a source for some of the go fast parts I picked up in college....some lucky bidder on eBay picked up my entire CFI system for about $350 if I recall.....

Here's a link to some of my pics......http://www.z28.com/gallery/showgalle...00&ppuser=5665

I have to post more pics of my progress on the 86......our 83 is stripped down waiting for a cage, SFC's, tubular k member, 4 link, and a DFI 396 SBC/T56, and finally all the body work- fiberglass hood, glass fenders, glass doors, and maybe glass 1/4's, but she's on the '10 year plan'......hence, I'm not very rich ...unless you count a loving fiance, loving Doberman pup, 3 Chevys (2 of which have no motor, trans, etc) and a 'Yota (I'm gonna cure our import problem here soon ...)
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