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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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 Posted: Sun Mar 13, 2011 2:52 pm Post subject: ? tunning a e85 750 w quick fuel parts |
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hey guys i rebuilt a 750 holley 4779 dp carb with a quick fuel e85 conversion kit wich is just some blocks. and their billett baseplate with ss blades. im having a bad tip in issue. car is unresponsive falls on its nose then picks up and starts to pull.
has the stock 4779 gas boosters, 30cc front and rear, not quite shure of the pvcr size but im thinking its stock the way they came. and 86/96 jets.
runs rich at idle and cruise wich i can fix by drilling the pvcrs and lowering the primary jet. ive had the squirters at .034 and drilled them to .040 still got the bog. timing is 40 total. 18 initial. msd ign. digital 6. hvc coil.
motor is 12.5:1 and worldproducts sportsman 2s ported w 2.08 and 1.6 valves. they are a undercut valve. cam is a crane nos roller .630/.630 lift 260s 270s dur at .050.
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Sun Mar 13, 2011 6:05 pm Post subject: |
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Setup sounds like it should work. Maybe some slight changes.
What accel cams do you have on it?
You may have to open the PVCR up some with that configuration.
The Quickfuel blocks have .073 PVCR I believe. With a 83 Primary jet I had to go to .090s range PVCR to get enough fuel with a similiar carb build. Also you will need to reduced HSB to .025-.028
IF you dont already know. A stumble says its rich at tip in. A cough or split second motor shut off is lean.
You may also find it wants more timing down low with e85.
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89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season. |
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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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| Posted: Mon Mar 14, 2011 12:14 am Post subject: |
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If I dead floor it from a stop the motor dies from like a 20 mph roll it almost fies then picks up and pulls but seems like it stops pulling up top real bad. Plugs are a dark grey. Wich I would take as rich but it acts lean. I'm gona look for a main body that's got alky boosters in it and drill the pvc to .086 to start
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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| Posted: Mon Mar 14, 2011 12:16 am Post subject: |
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If I rev it in park it will rev up but then tries to die so I have to hit the gas like 10 times to get enuf fuel to keep it running
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Mon Mar 14, 2011 6:56 pm Post subject: |
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| mattsv8_03 wrote: | | If I rev it in park it will rev up but then tries to die so I have to hit the gas like 10 times to get enuf fuel to keep it running |
did u reduce the iab for e85
_________________
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89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season. |
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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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| Posted: Mon Mar 14, 2011 10:30 pm Post subject: |
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No where do I need to put them so I should just get. A main body with anular booster. And screw in air bleeds. My main body is brass inserts stock style
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Wed Mar 16, 2011 12:44 am Post subject: |
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You can drill the restrictors out and tap them for 8-32 thread . Get some brass set screws and a drill index and drill them. Or tap them for 10-32 and order restrictors.
Have you searched on this site. There is lots of info on sizing here.
Annular booster arent necesarilly the answer. The id on the booster has to increase also.
A Wideband is your friend.
_________________
----------------------
89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season.
Last edited by 89shortbox on Wed Mar 16, 2011 12:48 am; edited 1 time in total |
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Wed Mar 16, 2011 12:46 am Post subject: |
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also notice the sticky at the top of the forum page that say Current Carb Specs.
_________________
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89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season. |
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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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| Posted: Wed Mar 16, 2011 1:00 am Post subject: |
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Yea I've been looking at it a lot. I'm putting my lm1 in it in the next few days out of my 8 sec e85 s10. Its getting a lm2. So ill be able to see right away what changes it needs. I'm gona call quickfuel tomorrow and see about buying a e85 main body and another new baseplate so I can up the size of the carb as well. 750 is a bit small. I don't have a bunch of time to play with the carb since race season is comming up.!
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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| Posted: Wed Mar 16, 2011 1:09 am Post subject: |
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Yea I've been looking at it a lot. I'm putting my lm1 in it in the next few days out of my 8 sec e85 s10. Its getting a lm2. So ill be able to see right away what changes it needs. I'm gona call quickfuel tomorrow and see about buying a e85 main body and another new baseplate so I can up the size of the carb as well. 750 is a bit small. I don't have a bunch of time to play with the carb since race season is comming up.!
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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89shortbox
Joined: 04 Nov 2007
Posts: 153
Location: Michigan
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| Posted: Wed Mar 16, 2011 1:56 pm Post subject: |
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You have a PM
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89 S10
406 SBC Twin Turbo BT
Going E85 this coming season
HAHA, the season is alreay gone to another season. |
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Eric68
Joined: 01 Nov 2007
Posts: 331
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| Posted: Wed Mar 16, 2011 9:59 pm Post subject: |
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| mattsv8_03 wrote: | | Yea I've been looking at it a lot. I'm putting my lm1 in it in the next few days out of my 8 sec e85 s10. Its getting a lm2. So ill be able to see right away what changes it needs. I'm gona call quickfuel tomorrow and see about buying a e85 main body and another new baseplate so I can up the size of the carb as well. 750 is a bit small. I don't have a bunch of time to play with the carb since race season is comming up.! |
Hope I don't sound rude here, but honestly, your results are completely typical of a "conversion" kit.
The stated marketing technique of the company you are dealing with is to sell the conversion kits, then sell the rest of the parts needed for a proper conversion when the kit doesn't work right.
They'll be glad to sell you the metering blocks, then the boosters, then the 50cc accelerator pumps. Why do you want to go back to these guys and buy more parts?!?!?
If you want to get it done right there are a couple of us that would be glad to help. IMO you need the proper downleg booster (not annular), the proper bleeds (both high and low speed), and 50cc accelerator pumps (yes you need them), correct pump cams, correct squirters, correct PVCR, proper jetting, and the correct needle and seats. I guarantee E85 will work well with your combo most of my customers report new best ETs.
By the way, unless there was something wrong with your old baseplate the new one was a waste (unless you like green parts). 
Again, sorry to be blunt, but it kind of gets me riled up when I see guys like you spending their hard earned money on stuff that doesn't work.
_________________
E85 racer and E85 carb builder
www.horsepowerinnovations.com
E85 powered 68 Camaro street car
Best ET on motor 9.96 @ 133 MPH, 5.92 on N2O in the 1/8th |
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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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| Posted: Wed Mar 16, 2011 11:40 pm Post subject: |
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I know the carb can be made to work but I don't really have the time. I need something I can bolt on and go. I don't mind buying a main body if there is one with a large enuf booster and screw in bleeds. Its got my modded csu e85 bowls that were on my e85 csu 850 for the s10. Its got ev bowls now. So really everything is a new carb except the main body. Does anyone know where I can get a 750 main body for e85. Thing is if its going to run 200 bucks ill just buy a new quickfuel 950 e85 racer is 650. And I know it works well and its the right size. Originally the 750 I have was to b the first then I was gong to make a duplicate for my tunnel ram. Wich I still wana do I have the nos dual plate kit already.if I could get this main body modded cheap enuf id do that too.its more time then money. I work 60 hr weeks. Plus racing the s10 and the season is getting ready to start so all my time is going to the new dart block buildup. I wana go low 8s this season maybe one 7.! On pump e85
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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Eric68
Joined: 01 Nov 2007
Posts: 331
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| Posted: Thu Mar 17, 2011 8:23 pm Post subject: |
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If you want a new carb, I do them for $680. Mine are custom, not a generic tune.
I can do a E85 HP main body (750 or 950). Custom downleg boosters installed, screw in bleeds, etc. $260. You'd probably go faster and be happier with an HP950, but if you do a 950 you need a different baseplate.
_________________
E85 racer and E85 carb builder
www.horsepowerinnovations.com
E85 powered 68 Camaro street car
Best ET on motor 9.96 @ 133 MPH, 5.92 on N2O in the 1/8th |
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mattsv8_03
Joined: 07 Mar 2011
Posts: 11
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| Posted: Thu Mar 17, 2011 10:32 pm Post subject: |
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If u can fix it for 260 booster and air bleeds. Could u make a twin with the other 750 I got. That way id have enuf carb for the tunnel ram. So fix the existing one and mod the other the other is all stock 4779 750dp. Its all apart and cleaned I just haven't reasembled yet cause I needed it 2 b e85 as well. I can run 2 750s and a 250 shot on the dual plate kit or a single 950 and the big shot kit with 225 ot 275.
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is 8.89 good on 15lbs with a stock 010 block on pump e85?
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