cross fire injection for a 383?

[at4vette]

does anyone know anything about the cross fire fuel injection for a 383 stroker? i dont want to chock out the motor and loose power because of the manifold ports being so small.. also is is possible to run crossifre with a motor with that many qubic inches?

 

[grumpyvette]

the crossfire intake will work, but its already restrictive on a 350 so you can expect it to be slightly more restrictive on the larger displacement engine

your stock heads,intake, displacement and compression ratio and cam are killing performance. the cross fire intake is the worst offender as it only flow about 170cfm-190cfm
swapping to a EDELBROCK SY1 with CUSTOM LID removes that resriction
THE EXTREMELY RESTRICTIVE STOCK INTAKE

custom lid SY1

compare the ports, the SY1 flows about 270cfm

<b>"A MODIFED EDELBROCK SY1 WITH CUSTOM TOP MATCHED TO 190CC AFR HEADS CRANE 114142 CAM -- AND add a 383 high compression engine kit"
b>
BTW Ill save you the math, youll need to get the 10:1 cpr flat top piston 383 kit for the street, and the 74cc combustion chambers AFR 190cc HEADS with L98 spark plug angles if you intend to run high test gas you find everywhere (some is lousy quality) and get the head gasket as close to .018-.022 as you can for correct quench
fyi DD-2000 and EA pro both guess at OVER a 115 hp improvement at the rear wheels, having done this type mod in the past Im reasonably sure thats UNDERESTIMATED for those listed changes
383 rebuild kit $1000
http://www.strokerkits.com/383.htm
crane cam/lifters $150
AFR heads $1200 http://www.flatlanderracing.com/cylhead_index.html
SY1 with custom lid $500-$600
DOING YOUR OWN WORK>>>>>PRICELESS! s: s:

offy
MORE USEFUL INFO
http://www.swko.net/~lionsden/crossfire.htm
http://www.swko.net/~lionsden/crossfire1.htm

unless your rich or hopelessly masochistic get a SY1

the sy1 flows close to 270cfm out of the box, a cfi flows 170-190cfm (DEPENDS ON WHICH PORT (STOCK) and theres not enought room to port without cutting/welding (EXPENSIVE AND TIME CONSUMEING AND EASILY SCREWED UP)

these are the STOCK CFI INTAKE RUNNERS,THEY WILL NOT SUPPORT A LARGE INCREASI IN HP WITHOUT MASSIVE CUTTING AND REWELDING WORK,WHICH COSTS FAR MORE AND WORK FAR LESS EFFECTIVELY THAN AN SY1 SWAP WITH A CUSTOM LID

this is the port work necessary to get them to flow even as badly as a TPI

 

[*89x2*]

*moved to C4 tech

 

[KANE]

does anyone know anything about the cross fire fuel injection for a 383 stroker? i dont want to chock out the motor and loose power because of the manifold ports being so small.. also is is possible to run crossifre with a motor with that many qubic inches?

Think Ebay...

I acquired all of my TPI's parts from Ebay (runners, chip, harness, injectors, cables, etc). I think I spent around $1k on the system. If you look for parts- especially around Christmas when most people are spending money on gifts for others- you'll find parts for cheap.

 

[grumpyvette]

the computer that controls the twin throttle body injectors on the 1984 crossfire
WILL NOT work without EXTENSIVE modification and re wiring with the later 1985-91 TUNED PORT INJECTION.
that why most guys go with a far better flowing intake base and keep the twin crossfire throttle bodies
your choices are

PORT the stock intake --marginal improvement at best you might get to 210cfm if your good at port work

install an adapter intake, http://www.x-ram.com/ best Ive seen is about 230cfm

better but hardly IDEAL


the IDEAL intake is the SY1 base with a custom top,(and twin, larger ported throttle bodys) but be aware the SY1 intake flows significantly more than the x-ram can, so youll need better heads and a larger cam to take full advantage of the SY1 intakes flow potential, easily 275 cfm, port work gets you close too 300 cfm


btw the STOCK chevy TPI intake flows in the 210-220 cfm range with a minor port & runner clean-up, aftermarket bases and runners can significantly improve that