Hey if you have been following my buildup you have seen many troubles well..I think I may have a problem either the machine shop did not tighten the retainer plate or did not grind off the tip for the lt1 and lt4( something is rubbing the timing cover)


I have the LT-4 cam with the duration I=203 E=210........I was thiking of steping up to something to I=235 E=235 duration would this be a power increase....both intake lifts are 480. You can see everything else I have in my SIg.

Thanks
Brian

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1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb

 

235 @ .050 is much to big for you combo IMHO.
It will idle like **** and have zero low end power.

I'd stay under 211 @ .050 on the intake.

 

DO you think the Lt-4 is enough??? It just seems a little slower than I expected.


Brian

------------------
1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb

 

The LT4 is plenty for now. It just needs more tuning.

If the cam was walking, that would explain the timing fluctuations you were having. Could have spanked some of the cam lobes.

 

Well I don't know yet if it was walking or the pin for the LT1-LT4 dist. was not taken down enough. I hope to find out this weekend. I keep thinking this combo just is not strong enough...or the knock sensor is picking up the noise and taking the timing back.


Brian Felts

------------------
1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb

 

Do some testing and tuning before you decide that it's a weak combo.

You may need to burn your own proms to get there.

 

Brian, one step at a time. DOnt toss it yet, you know that cam is capable of an easy 330HP on a 348 Cu. In. engine.
What you have is a problem some where. Find out what is making the timing cover shake. YOu might have to pull the cam out and check the lobes if there has been any major damage under the timign cover.

Your chip is fine for your application. Dont worry about that yet, just get this combo running and we will tune on it and see what happens. Than we might need to slap a bigger cam in it.

If you want more power here is a though, get a cam of lower lift, lots of duration and do a NOS set up on it.

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

The pin on that cam is long enough to drive the optispark on an L99/LT1/LT4... but it's too long for you on a Gen I sbc LO3. It probably IS rubbing against the timing chain cover. I don't know if you can tap it deeper while it's still in the engine, or whether you'll have to remove the cam to do it. You may also be able to use a double gasket, or a gasket + gasket-shaped-shim under the timing cover, without touching the pin or the cam; both may provide enough clearance.

You might also want to use a cam button, or thrust bearing to help keep the cam from walking towards the timing cover. I have zero direct experience with that btw, but I do know that they might help.

You mean LT4, and the durations you provided are when 1.6 rockers are used.

DON'T. Not yet. That cam in your motor with your mods should run great, and be fairly mild mannered as well. The cam you are contemplating (235/235) will be great at 4500+ rpm at WOT, but it will be lousy on the street. You won't like it, especially in a street-driven 305. You need to give the LT4 cam a chance first.

My initial guess is that the ECM you've added isn't well matched to your car/engine/mods.

See the following for comparison:

http://www.impalassforum.com/cgi-bin...c&f=9&t=000089

and then read:
http://www.hioutput.com/tech/290hp/290hp.html

The engine (in the above article) is close to what you have in all aspects (heads, cam, etc). A carb was used, and it's probably easier to tweak the fuel and timing needs on a carb'd engine that it is on a computer-controlled one... unless you are a DIY ECM tuner. But aside from that, the engine are very similar and therefore you should be looking at around 300+ fwhp from a 305, and 330+ ftlbs too. An engine like that will run GREAT in your car.

You should probably tell us more about what the driveability problems are first (sorry if I missed those posts).... but my guess is that you are either running too rich at all times, or too lean. Both can be fixed, some with band aid solutions as well as with ECM tweaks. HTH. - Ken

 

Problem is timing. Its all over the place all the time and a rediculous amounts of knock counts, but we are not lean.

------------------
89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

 

Well yes the timing is off a bit but I think that is because I am getting a steady knock count of 1 or 2. I am betting now that its what ever is behind the timing cover I will keep you all posted.......I hope to get started Monday.

PS I do have a custom chip....


Brian

------------------
1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb