radiaki

1986 Trans Am with a 305ci LG4 V8, and I just bought an edelbrock 600cfm 4 barrel double pumper carb with a performer intake manifold, and performer cam and lifters. I also bought a edelbrock true rolling timing chain and MSD 6AL ignition control. After putting all these one what kind of horsepower and quarter mile times should i expect? I was also wondering what i need to do with the wire from the computer that controlls my Q-jet, because my new carb isnt computer controlled. Should i just leave the wire hanging or is there some kind of way I should fix it so the computer dosen't think the carb is screwed up? any help would be great!

1986 pontiac trans am
305ci LG4 V8
flowmaster cat back with dynomax cat
k&n air filter
borg warner T5 5 speed tranny.
accel super coild and spark plug wires.

Drew305

The computer on LG4 cars controls both the mixture (carb) and the timing (distributor). Unfortunately, there isn't much you can do with the wires that used to go to the carb to fool the computer. Without feedback from the carb, you will ont get any timing advance, and your car will be a complete dog.

Alot of people have had good luck running the computer controlled carb and dist with cam upgrades, but if you really want to ditch the computer controlled carb, you will need to get a pre-'81 vacuum advance distributor.

Jester wrote a tech article on how to swap to carb on a TBI car, and it is basically the same operation as for compturized carb, so you might want to have a look at it in the tech section.

Good Luck

------------------
Pimped-out '85 Z

Ed Maher

First off, i think you are confused. Edelbrock doesn't make double pumpers, only carter style carbs.
Second, immediately return that cam kit, it is not worth the trouble to install it. Invest in something a little bigger from someone else.
Third, if you got a carb with electric choke, you can reuse that wire. You can do whatever you want with the rest, they don't do anything anymore.
Fourth, You need another distributor, one with vacuum advance. The stock distributor is computer controlled and will never work right without the stock carb. Actually, it could be rigged to kinda work, but driveability and power would still suck, and errors would abound. I could never fully explain this though, so forget i said anything.

Honestly, if i were you, i'd get rid of everything you just bought. The stock intake isn't a bad piece, and will do more than your heads will ever let you. The stock carb is a great piece and will take you as fast as you ever want to go. The stock HEI with a good coil on it will light your fire with no problems.
What you need is headers and a real cam. Get them with the money you wasted on this stuff. Headers and a real cam will do 3x as much as what you have bought so far, and by keeping the stock carb, you'll also have gas mileage and emmisions on your side. If you hae money left over down the road, i'd go with gears, then start worrying about the intake and ignition. But at that point, your heads are the real bottleneck anyway.
ed

Biochem

If you are not willing to go with a 350, then at the very least port your heads, get new springs (you'll need them with that much lift), and new gaskets. If you get thinner ones, then you can raise the compression ration too.

Actually, the Performer RPM cam is a little big for the 305, the Performer cam is weak. Stay in the .500" lift (dual paterns are good) and no more then 218 duration and a 112 LSA. That is more cam then your stock heads can handle, but there really isn't much aftermarket (besides Wrold Product Torquer heads I think) that will fit a 305.

Like Ed says, you will need a vacuum HEI to get rid of the ECU and run that carb. I will say that the q-jet will support your engine... it does mine!



------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock... all the suspension stuff... 9-bolt posi disk is in... K&N filter... 93 octane...

I got the GO... I need the SHOW... Interior is next!

radiaki

but if i get a different distributor, that would mean when i go to get my car smogged i will have to put the old carb on, and the old distributor?? how much Horsepower should i expect from these mods? I know the LG4 isnt a very powerful V8, but it's all i got for now.. BTW, its a performer-plus cam, not performer RPM cam. and my carb is a square bore 600cfm edelbrock carb. #3701

five7kid

iTrader: (14)

I'd have to agree with Ed on this one. The Performer intake is smog legal (you got the ERG type, right?), but the carb isn't. Keep your stock intake or put your LG4 q-jet on top of the Performer intake, but the only emissions-legal route is with the q-jet. You can pass with the Performer cam, but you never will with the Edelbrock carb. I couldn't tell you if the MSD works with the CC distributor, but it probably wouldn't help power much if at all even if it does work. The coil and module are the weak pieces of the HEI, and together those upgrades cost a lot less than the MSD.

Spend your money on the mods Ed suggests, and you're looking at a good 60-80 hp gain. With what you have, you might gain 20-30. If you really want to wake it up, go with World 305 heads while you're at it - then you'll see some real power with Ed's mods (~$650 unassembled with upgraded springs from Competition Products, ~$50 more assembled).

Of course, spend those $'s on a 350 and you're probably even farther ahead, power-wise.

------------------
82 Berlinetta, orig V-6 car. Rescued w/86 LG4/TH700R with all harnesses, sensors, ECM, etc. 3.08 open, cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, World 305 heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. Currently 396 .030 over, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

Ed Maher

Wow, i just realized you were in CA. Forget completely about using that carb and intake. You said it yourself, you'll have to put all the stock stuff back on whenever you go to get tested. Way too much hassle IMO. Especially considering a Qjet won't even bolt to a square bore intake without an adapter, and it prolly wouldn't fit under the hood or run quite right with such an adapter.
Also as i already said, the edelbrock cam is too small to be worth installing. You'll barely notice any difference at all. Go with something a little bigger and you will be much happier. I can't emphaisize that enough. I already said the rest in my other post.
...ed

five7kid

iTrader: (14)

Unless it's a Performer RPM, Performer manifolds have provisions for both spread and square bore carbs. But, the intake really isn't your problem, so do what Ed says.

FastBroker

When you say Performer cam, do you mean cam 3702 for LG4 or Performer cam 2102 for SBC??? I'll assume you have the 3702 which is a very mellow cam... VERY mellow. If you have 2102, you'll be ok.

If you have 3702, go with a generic 204/214 duration at .050 and about .420"/.442" cam (edel specs) and you will see MUCH better results. FYI, the 3702 cam is 194/214 duration with .398"/.442 inch lift... Also, advertised duration is larger on 2102 cam...

The 2102 cam is mellow enough to get by the CA sniffer, too, if carb tuned ok....

[This message has been edited by FastBroker (edited September 13, 2000).]

Biochem

I passed emmissions (sniffer and visual in NC) with my new engine and stock q-jet. I don't think he looked to see if it was a computer controlled q-jet w/HEI or not, so I plan on changing it and if they say jack... the stock goes back on.

Zepher

iTrader: (1)

On my 86 LG4 Trans Am I used the following:
Edelbrock #1406 600cfm Carb w/ elec. choke
Edelprock Performer RPM #7101 Dual Plane Hi-Rise Intake Manifold
Vacuum Adv. Dist. with an MSD HEI Coil

Car runs quick, but I need to replace the Valve seals, the engine blows a cloud of white smoke when I start it up, goes right away.

------------------
Zepher
'86 Pontiac Trans Am WS6, 5 Speed:
Edelbrock 1406 Carb, Edelbrock Performer RPM 7101 Intake Manifold.
Edelbrock Open Element Air Cleaner: Flowmaster Exhaust, 160* Thermostat,
Grant GT Steering Wheel, MSD HEI Coil, Taylor 8mm Wires, Recaro Seats,
Alpine CD+Changer,Rockford & Soundstream Amps, Premier TS-1040C Subs, Polk Audio highs/mids.

86 Trans Am & Girls

FastBroker

If you get a cloud of white smoke (white smoke is STEAM, not smoke), you may have a blown head gasket my man, not leaking valve seals. Blue smoke on start-up is valve seal problem. You better get that checked-out QUICK!!!

[This message has been edited by FastBroker (edited September 18, 2000).]

MRZ28HO

If the white smoke goes away, (like 2 minutes after start up) then it is not a blown head gasket. But rather condensation, which is normal when you start a cold engine in the morning or cold weather. If it persist (doesn't go away as quick as before) then you should worry about it. Keep an eye on the coolant level.

------------------
George P. Lara
1994 Z28 LT1 T56
1984 Z28 High Output
Member: SCCA, SCFB, SC3GFB

FastBroker

Not too cold in Santa Rosa, I bet. A little vapor/puffs is ok but if you have no blue smoke, your valve seals are ok...

Petes 84Z28

My LG4 mods and results are in the sig...

Pete

------------------
Pete's Place
Now at HiOutput.com<P ALIGN="center"><IMG SRC="http://www.hioutput.com/pete/83SC.gif" TITLE="Pete's 83 SC">
My 83 SC...(originally V6) 197,000 mile LG4/5-speed from an 84 Z28, 3.42 one-tire-fryer, T-tops, PW, PH, gray interior from an 86 Firebird SE, seats from an 89 Formula, wheels from an 83 Z28, springs and rear bar from an 84 Z28, WS6 front bar, boxed LCA's, Hedman Hedders and y-pipe, Dynomax cat-back, .420" lift cam, Accel HEI Supercoil and foam air filter, custom air induction through 84 Z28 hood.....best ET on paper is 14.935@94.14 (corrected is 14.79@95.75)</P>

Zepher

iTrader: (1)

My coolant level doesn't go down, it's still full. I am pretty sure that it is the valve stem seals, everyone I've saled about it told me that was the problem.
Going to the track on the 30th(weather permitting) to see what my car runs. Hope it does well.

------------------
Zepher
'86 Pontiac Trans Am WS6, 5 Speed:
Edelbrock 1406 Carb, Edelbrock Performer RPM 7101 Intake Manifold.
Edelbrock Open Element Air Cleaner: Flowmaster Exhaust, 160* Thermostat,
Grant GT Steering Wheel, MSD HEI Coil, Taylor 8mm Wires, Recaro Seats,
Alpine CD+Changer,Rockford & Soundstream Amps, Premier TS-1040C Subs, Polk Audio highs/mids.

WS6 Trans Am