I don't know if it's been covered or the pic belongs to a member here, but here is the infamous late model year fix to even out the A/F distribution.. Google likes me.
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Maintaining Grandma's 84 CFI GM for her
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I think rather then putting rectrictor you should take manifold of and round off sharp corners on the bottom of throttle bores.“Cars are the only thing on earth that will beat you, break you, make you bleed, make you cry, spend all your money, spend all your time, not work and not care that you will love more, the more they abuse you.” -Anonymous -
Its not really a restrictor like in racing. Its purpose is to even out the distribution of the fuel/air mix so that it doesn't end up running lean on some cylinders. It probably doesn't harm performance in any meaningful way, but it likely helps with detonation problems.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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I posted this pic on an MPG CFI thread I started on speedtalk before I found the pic of the the plate trying to pick old timers brains for mpg's, and only the interested learn.
I bet this plate would help roundie cars mandated to run a 2 barrel....... They don't run WOT the whole race.. What's the diff between a CFI and a holley or autolite 2BBL? Still fuel entering at the same place, and the same throttle blade angle. Probably even TBI chevy guys would benefit if they made their own style version of this plate..
I F'n eat, sleep, breathe, and fantasize performance, mpg's, and all out HP potential.Last edited by crazyman; 09-22-2013, 03:03 AM.Maintaining Grandma's 84 CFI GM for her
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Aren't the injectors mounted slightly off center on the CFI though? Seems to me there is some mechanical reason in that throttle body for the uneven fuel distribution that carbs may not have.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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Besides the huge fuel injectors sitting directly in the way of air flow? lol...Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
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85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereoComment
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well, i mean are they off center, or positioned in such a way that more fuel goes to one side of the throttle plate, etc. Might just be the support stand for the injectors is the whole problem.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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Lol. Yeah they are kinda off center. They sit angled too and were more towards the back of the intake holes. At least mine wereOriginally posted by 85crownHPP View Post1985 LTD Crown Victoria - Currently restoring after she caught fire! CFI to SEFI to Carb swap, all custom wiring, Duraspark 2 ignition, Motorcraft 2100 Carb, slicktop, Shorty headers dumped before rear axle, 140 Speedo, 3G alt, And currently building an engine for her.
2000 Lincoln Town Car Signature Series - 165XXX, PI intake swap
, 30 MPG Easy on the Highway
, All options except dual exhaust. Currently looking for 2 front seats: Heated, Memory, and Light Graphite color!!Comment
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mmmmm restrictive everything.
2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIPComment
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looks rather worse than I remembered it.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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I made a plate today.
Then after another can of inspriration, I decided these notches would serve the plate's purpose and help atomization..
On my 93 v6 MPFI dakota I had awhile back, I swapped to smaller injectors and upped the pressure. Night and day driveability and MPG's, which another can made me remember.
GM plan... My plate, my modded egr spacer, 3.8 cfi injectors, adjustable VACUUM REFERENCED fuel pressure regulator for a 'stang, and a countour cooling fan setup...
Gonna do all the TB related stuff at the same time..
All I'm seeking from this car is throttle response and mileage. Oh. P71 sway bars down the road.....Last edited by crazyman; 11-07-2013, 11:55 PM.Maintaining Grandma's 84 CFI GM for her
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My mowers got better throttle response than my GM. I've tossed around the idea of going carb, 2bbl or 4bbl, staying CFI or going EFI. I'm still unsure.
'93 T-bird
'03 Silverado ECSB
Missed:
'88 Mark VII
'86 CVComment
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speed density has great throttle response. Mass air has a little air flow lag (about .25 second typical IIRC) compared to SD. Perceived response is greatly helped by gears since the easier it is to move the old boats, the faster they get going, the "better" the response is.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
Originally posted by gadget73
... and it should all work like magic and unicorns and stuff.
Originally posted by dmccaig
Overhead, some poor bastards are flying in airplanes.Comment
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I'll keep the community updated when I get paid for next week's work, Sly.. I hafta order the parts after pay day, wait, install, and tune. First though, I have to full tank it a few times to get a baseline MPG rating. These are truly archaic systems.. Like playing atari vs. ps4. They should be easy enough to tinker with.Maintaining Grandma's 84 CFI GM for her
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CFI... when it works... works great and gets pretty good mileage... but it's very much a gutless wonder. EFI is more fault tolerant, but doesn't get quite as good of mileage but has a little more power. Mass air HO generally has more power, and driven nicely, better mileage. 3.55 gears gave me between 2 and 3 MPG increase in my 88 lopo as well.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
Originally posted by gadget73
... and it should all work like magic and unicorns and stuff.
Originally posted by dmccaig
Overhead, some poor bastards are flying in airplanes.Comment
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