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  1. #51
    FEP Super Member PaceFever79's Avatar
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    Quote Originally Posted by Skrilla View Post
    I know this thread is old however, I just wanted to say that I was having throttle problems with my new Edelbrock 1406 and using the 1405 stock springs, rods, and jets worked like a charm. My truck now runs better than it did with my Holley and really better than it has since I've bought it.

    If the OP reads this, thanks a bunch man.
    Cool! Glad to help!

  2. #52
    FEP Senior Member droopie85gt's Avatar
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    When I was running a 600cfm Edelbrock, I found the chart that listed the effective orfice at cruise and power setting to be the easiest way to tune. I ordered several sets of rods and without changing jets I was able to look at the wideband and adjust rods by looking at the orfice size. I had it pretty damn good too when I decide to go with a double pumper and now EFI. It cranked up, cruised at 14.5-15.5 and WOT was 12.7-13.0. It got 14-15 in town and 18-20 on the highway. (The double pumper got 10-11 in town HAHA)
    1985 GT, Sunroof, 5 Lug, Rear Discs, 01 Graphite Bullets, 88 forged piston shortblock, 2.02/1.60 Alum heads, Weiand Stealth, Holley C950 TBI, BBK Long tubes

  3. #53
    FEP Member brianj's Avatar
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    Bump for those of us who are new to this site. What a good write-up!
    1983 Mustang G.T. No-option stripper- I like strippers.
    5.0, GT40P heads, Comp Cams XE270HR-12 on 1.6 rockers, TFI spring kit, Weiand 174 blower, Holley 750 mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, 8.8 rear, 3.73 gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.

  4. #54

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    Excellent info in this thread, I have searched high and low on the internet for the past month and have found very very little info about edelbrock performer/thunder series carbs on a mild/street/strip 302. Thanks to all that have contributed.


    Quote Originally Posted by cb84capri View Post
    it is all trial and error. my ideal setup runs anywhere from 13.6-15.2 in cruise. at 75mph @ 2200ish rpm it hovers around 13.6-14.2ish, and the weather does make a difference. the other tune was just too much of a gap for this carb to bridge.
    It amazes me after messing with my 85 for hours today how much fuel (even at cruise/light throttle conditions) these engines need. I noticed on my 85 it doesn't like anything leaner than mid 15's for more than a few seconds. I have my gti tuned at light throttle it runs around 16-18, but peg the gas and it drops down to 11.8 - 12.1 at 3k rpms. The gti runs great even that lean, and can get 34mpg (did so on a recent trip).


    I just purchased a 1806 Thunder series avs for my 85 GT. I also bought the calibration kit cause I knew I was going to be messing around with it. While currently my car is "stock" save for a performer intake and a set of shorty headers/h-pipe and flowmaster catback, I knew I was going to be leaning out the carb a bit. I have a wideband, and am also going by "feel" as I did on the last car I built and tuned (89 VW GTI 16v). Currently I am running .92 primary jets, and .065x.047 rods and the stiffest spring and the stock secondary jets which i believe are .95. Its pretty good at idle/cruise/part throttle, but wot crashes in, and runs real rich initially. After reading this thread, and through the book (performer series book, aparently its the same carb besides my adjustable secondary control), I am going to try some other things tmw, and rejet/change metering rods to different settings and try to get the .92 jets in on the secondary side to see if it helps. I believe this carb is a bit overkill for my stock engine, but I knew this going into it and have a set of gt40p heads that have bigger valves I plan to install later on this year along with a cam and bigger intake.
    2015 Ford Fiesta ST
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    1985 Ford Mustang GT
    1983 VW Rabbit GTi 16v
    1983 Mercury Capri CC

  5. #55
    FEP Power Member David Claflin's Avatar
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    It's not overkill, I ran a 750 on my 302 in an 84 LTD wagon and it worked great once it was dialed in.
    1985 LTD LX, Mach1 brakes, 17" Mopar police car wheels. 302, T5, 4.10s
    1984 LTD station wagon, with 84GT nose, some might remember it as the old Dugan Racing station wagon.
    1986 FHP coupe, stock shortblock, TW heads, Holley SMII intake, 4.88, T5Z
    1990 Red LX, ported AFR heads, TFS-R box upper, weenie cam, 1 3/4 long accufabs, 3" exhaust, T5, 4.56

  6. #56

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    Quote Originally Posted by David Claflin View Post
    It's not overkill, I ran a 750 on my 302 in an 84 LTD wagon and it worked great once it was dialed in.
    That is very good to hear...so in other words its all in the tune!
    2015 Ford Fiesta ST
    2015 Jeep Renegade Latitude
    1997 Ford Explorer 5.0L
    1985 Ford Mustang GT
    1983 VW Rabbit GTi 16v
    1983 Mercury Capri CC

  7. #57
    FEP Power Member David Claflin's Avatar
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    Quote Originally Posted by Dacolino View Post
    That is very good to hear...so in other words its all in the tune!
    Absolutely, I got the same mileage and better performance with the larger carb. I had the kit, to get it dialed in too, even used a single wire O2 sensor to help with the tune, read plugs too to make sure it was right. if I had it to do over again I'd do the 750 right off the bat, instead of fooling with the 600 and 650 edelbrock and holley carbs.
    1985 LTD LX, Mach1 brakes, 17" Mopar police car wheels. 302, T5, 4.10s
    1984 LTD station wagon, with 84GT nose, some might remember it as the old Dugan Racing station wagon.
    1986 FHP coupe, stock shortblock, TW heads, Holley SMII intake, 4.88, T5Z
    1990 Red LX, ported AFR heads, TFS-R box upper, weenie cam, 1 3/4 long accufabs, 3" exhaust, T5, 4.56

  8. #58
    FEP Senior Member TireDood's Avatar
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    Quote Originally Posted by machm1969 View Post
    I have a 1406 and I bought the stock metering rods, jets and orange springs that are stock in a 1405. What a difference! Better acceleration off the line and rolling, very good article!
    I had the same results. The 1406 "out of the box" was fine for the tired old original 302, but when I built the new one it was a dog. Found this thread and rebuilt the 1406 with the stock 1405 setup, MUCH better!!!!

  9. #59
    FEP Member brianj's Avatar
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    Finlay got to do the jet changes on my car. Just the stock setting 1405 jets make it like a different car!
    1983 Mustang G.T. No-option stripper- I like strippers.
    5.0, GT40P heads, Comp Cams XE270HR-12 on 1.6 rockers, TFI spring kit, Weiand 174 blower, Holley 750 mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, 8.8 rear, 3.73 gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.

  10. #60
    FEP Super Member IDMooseMan's Avatar
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    Excellent news.
    Craig "IDMooseMan" Peters
    1979 Mustang Ghia Notchback, 2.3L, Holley 5200, 4-spd, 3.08:1 7.5" diff, A/C, PS, PB, AM/FM/8-Track, Sunroof, Rear Defroster
    USAF SSgt 63170 1983 - 1992; Co-Founder, Vice President, Omega Delta Sigma, ID-A 2/2015
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    2.3L Horsepower Potential Thread
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  11. #61
    FEP Member brianj's Avatar
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    Bump for the new guys on the site. This is great info for the Edelbrock users.
    1983 Mustang G.T. No-option stripper- I like strippers.
    5.0, GT40P heads, Comp Cams XE270HR-12 on 1.6 rockers, TFI spring kit, Weiand 174 blower, Holley 750 mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, 8.8 rear, 3.73 gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.

  12. #62

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    This is great info. I bought a 1406 last fall and although it seems to work OK I'm honestly not too impressed with the performance overall. Now it's surging at light load which I think is an intake gasket leak but overall it has a lot less punch than the tired stock motor in my 85 had.
    86 Notch under construction

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  13. #63
    FEP Member brianj's Avatar
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    Willing to bet it is the step up springs.Have you tried re-jetting it to a 1405? Made a huge difference on mine.
    1983 Mustang G.T. No-option stripper- I like strippers.
    5.0, GT40P heads, Comp Cams XE270HR-12 on 1.6 rockers, TFI spring kit, Weiand 174 blower, Holley 750 mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, 8.8 rear, 3.73 gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.

  14. #64

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    Quote Originally Posted by brianj View Post
    Willing to bet it is the step up springs.Have you tried re-jetting it to a 1405? Made a huge difference on mine.
    I haven't found a vacuum leak so I'm starting to suspect the carb itself. Idles perfect. It just about stalls taking off from a stop if you don't ride the clutch a little too. Seems fine under load just a little weak. But it is a stock motor with nothing but dual exhaust too. I'm going to play with it some more next weekend but I'm starting to think reworking it to stock 1405 specs is a good move. The regular off the shelf holley 600 worked PERFECT on my 85 which was basically stock. Kind of kicking myself for not just buying another one of those.
    86 Notch under construction

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  15. #65

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    Quote Originally Posted by brianj View Post
    Willing to bet it is the step up springs.Have you tried re-jetting it to a 1405? Made a huge difference on mine.
    Just ordered the parts to do this. I did have an intake gasket leak and the car runs a lot better now. But still lacking a little punch and surging at light load at 35-50 MPH or so. Gotta be too lean.
    86 Notch under construction

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  16. #66
    FEP Super Member PaceFever79's Avatar
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    Quote Originally Posted by 85GT-79FJ40 View Post
    This is great info. I bought a 1406 last fall and although it seems to work OK I'm honestly not too impressed with the performance overall. Now it's surging at light load which I think is an intake gasket leak but overall it has a lot less punch than the tired stock motor in my 85 had.
    IS there a cam in the engine? What are the specs?

    If the cam has enough overlap it can cause the step up springs to float (and surge).

    All things being correct, I agree changing the springs should help.

    Also, make sure your timing isn't too far advanced.

  17. #67

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    Quote Originally Posted by PaceFever79 View Post
    IS there a cam in the engine? What are the specs?

    If the cam has enough overlap it can cause the step up springs to float (and surge).

    All things being correct, I agree changing the springs should help.

    Also, make sure your timing isn't too far advanced.
    It's a completely stock 84 motor with 82k miles. I just pulled the smog&egr stuff off, put on an edelbrock carb spacer and the 1406. And it's got dual exhaust. Otherwise bone stock. timing is at 10 degrees BTDC I believe. It runs fine just seems like it should have a bit more punch and the surging in 4th on secondary roads is really annoying. Engine vacuum still seems a little low though. It only pulls 16hg at idle. Rock steady though.
    86 Notch under construction

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  18. #68
    FEP Super Member PaceFever79's Avatar
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    16 is low enough to need heavier springs. I suspect it is low because of some mechanical
    problem, or possibly just from high miles. But I wouldn't try tuning the carb until you get
    that sorted out as much as possible. Have you done a compression test?

  19. #69
    FEP Super Member PaceFever79's Avatar
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    Also do you have the vacuum advance connected to timed port or manifold port?

    It should be connected to the timed port (front passenger side port)


  20. #70

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    Yep hooked up to the timed port on the carb. No I haven't done a compression test. But it idles smooth as can be and doesn't burn any oil. Honestly I'm a bit apprehensive to do a leakdown or compression test on it. I won't have the funds to do motor work on this car for quite a while. Don't want to depress myself. It did sit without being run for at least 3-4 years before I bought it though.
    86 Notch under construction

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  21. #71
    FEP Super Member PaceFever79's Avatar
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    Okay, well, the valves and rings could just be gummed up. It can't hurt anything to pour
    some Seafoam into the intake manifold and see what comes out. Myself, I like to remove
    the coil wire and crank it to get it good and worked in before starting. Also dump some in
    the oil then change the oil after you run it for a few minutes.

  22. #72
    FEP Super Member PaceFever79's Avatar
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    After you do that and check for vacuum leaks we can proceed to tune the carb
    as best we can given the current state of the engine.

  23. #73
    FEP Super Member PaceFever79's Avatar
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    Also wanted to say, 16" isn't terrible, just a little low, we'd like to have 18-19" on a stock 302

    I think once you do the Seafoam, and tune the carb to 1405 specs, it will run better!

    Install the 1405 spec springs, rods and jets, and let's see what we get.

  24. #74

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    I installed the 1405 jets, metering rods, and springs on Sunday. HUGE difference! Lots more midrange punch and a very noticeable difference in power and sound at WOT. No more surging either. It is a little stinkier too which was expected but I plan on putting some Magnaflow spun cats on it soon anyhow. Of course I dropped one of the linkage clips so now I have a piece of welding wire on my choke linkage.... Need to check a few friend's garages to see if they have one I can steal. Edelbrock only sells them in kits.
    86 Notch under construction

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  25. #75
    FEP Super Member PaceFever79's Avatar
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    Quote Originally Posted by 85GT-79FJ40 View Post
    I installed the 1405 jets, metering rods, and springs on Sunday. HUGE difference! Lots more midrange punch and a very noticeable difference in power and sound at WOT. No more surging either. It is a little stinkier too which was expected but I plan on putting some Magnaflow spun cats on it soon anyhow. Of course I dropped one of the linkage clips so now I have a piece of welding wire on my choke linkage.... Need to check a few friend's garages to see if they have one I can steal. Edelbrock only sells them in kits.
    I'm glad we got things sorted out!

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