low end power disappeared? Reply #105 – January 01, 2015, 09:06:40 PM Run some higher octane gas first off. If you're running 87 octane 14* BTDC might be a little too far advanced to prevent pining. 91-93 octane should allow you to run 14*-16* base timing. As far as spinning the tires off the line if you have a stock AOD it might be difficult. The stock converter won't allow you really get into your engine's peak rpm as it stalls too low. You'll need a higher than stock stall converter if you really want to burn the tires off the line.The joys of upgrades. You always need more to make the car more fun :) Quote Selected
low end power disappeared? Reply #106 – January 01, 2015, 09:09:39 PM I agree with that. But the auto has a good first gear ratio. But we do not know his final drive ratio. Remember the 302 HO engine makes 300 FT LBS of torque, that is a bunch of torque Quote Selected
low end power disappeared? Reply #107 – January 01, 2015, 09:31:42 PM Stock stang is about 7.5-8 seconds 0-60 with an aod. I would guess you should have about a 50hp improvement with trickflow heads.Id check fuel pressure, and if you still have the stock pump, id replace that with a 155lb/hr or better pump. You may want to consider mass air and 24# injectors with a tune minimum, but a stand alone or other upgrade may be cheaper in the long run.Good luck, check it out and let us know what you find. Quote Selected
low end power disappeared? Reply #108 – January 01, 2015, 09:47:40 PM His Sig says he has 3.73s.FWIW, an issue has been found and corrected. This does not guarantee that there are no others. IMO a scan for codes and a check of vacuum should still be done. Quote Selected
low end power disappeared? Reply #109 – January 01, 2015, 10:19:08 PM Quote from: TOM Renzo;442306I had an issue years back with an MSD dizzy that was for a batch fire engine in a sequential ECM. It ran but it did not react properly and low on HP.Unless it was a GM vehicle, I don't see how the engine or any mechanical part could care any less whether the EEC tells it that it's going to pulse the injectors sequentially, or in either bank of 4 (or 3, if it's a V6).Elaborate..? :)Not calling you out, I'm sincerely curious as to why the distributor of all things made a difference in regards to bank vs sequential.Or maybe I've forgot all the stuff I picked up back in the very early 2000's when I was researching doing an HO swap on my '92 F series.. Quote Selected
low end power disappeared? Reply #110 – January 02, 2015, 07:04:05 AM Ok 3.7 then something is still not working properly. We dynowed a similar setup at just shy of 260FTLBS so that can definitely spin wheels. His setup should be putting down comparable torqueDistributor installation is a synchronization exercise on its own, you're not only timing the spark events using the cam-to-dist. gear connection....you're also timing the fuel injectors priming order for a correct, and optimum, fueling pattern.EFI/EEC-IV/SFI systems, will be screwed up if the timing pulse from the stator sensor, which incudes a narrow pulse to id cylinder #1, is not synchronized with the firing order. Another words the engine needs to know where number 1 is at with the initial timing you set it at. Quote Selected
low end power disappeared? Reply #111 – January 02, 2015, 09:44:08 AM To the OP,Have you checked to see if the car is throwing any codes? You need to start with the free stuff like this, looking at the plugs, and checking for vacuum leaks. Another question I have is when you did the conversion did you also install new plugs, rotor, cap, plug wires or did you just leave the old stuff on the motor?Darren Quote Selected
low end power disappeared? Reply #112 – January 02, 2015, 09:51:14 AM Quote from: Aerocoupe;442333To the OP,Have you checked to see if the car is throwing any codes? You need to start with the free stuff like this, looking at the plugs, and checking for vacuum leaks. Another question I have is when you did the conversion did you also install new plugs, rotor, cap, plug wires or did you just leave the old stuff on the motor?DarrenI'll check the codes this PM after work. Yeah, just kept the old stuff -- the spark plugs were new before I did the upgrade. Quote Selected
low end power disappeared? Reply #113 – January 02, 2015, 09:52:48 AM one question I never could get answered..the finned windows that pass through the stator magnetic field...... does the eec keep the injector triggered on when the stator is in the "open window" or the "closed" window.something tells me the eec is turning on a given injector when the magnetic field on the stator has an open window ,, the metal fin passing in front of the stator determines the time the next injector to fire in line is off. Quote Selected
low end power disappeared? Reply #114 – January 02, 2015, 10:08:19 AM to the original poster,typically you will notice that any photos of engines you see here, you will note (and as I think you mentioned already you noticed), the number 1 dizzy cap post is directly in line with number six, these two posts will be pointing "almost" straight ahead towards the front of the car.you mentioned 12'oclock earlier... so if your wanting to check timing correctly, the unfortunate truth is you may end up having to take off the pass valve cover, pull out spark plug 1, verify that both cyl1 rockers are up when your harmonic arrives at TDC. when finding this point its best to insure your rotating your final setting in the direction the car normally spins.once that is done, you should be able to peek under the dizzy cap and verify the rotor button is "very near" cyl 1 spark plug wire post. remember the dizzy goes the opposite direction so compensate for that in your guesstimation. at that point you will have cyl6 spark plug post will be "not so straight ahead but more towards the driver side.,,, cyl 1 will be aimed more towards the pass side of the fire wall.at the end of the day if your looking into the engine bay and after you set your timing to 10deg btdc, you will see that cyl 1 & cyl 6 plug wire posts are almost straight ahead and your TFI is pointing towards the driver headlamp Quote Selected
low end power disappeared? Reply #115 – January 02, 2015, 10:14:21 AM With the compression numbers he posted on #1 all he needs to do is plug off the spark plug hole on the #1 cylinder with some wadded up paper towel and roll the motor over by hand. It will pop the paper towel out on the compression stroke. From there you can use a thin screw driver and continue to roll the motor by hand until TDC is achieved. This is done by feeling the piston move up the cylinder with the thin screw driver. It will top out, there will be a dead spot where it will not move, and then it will start to fall. TDC is whrn the piston no longer rises. I would be shocked if this does not end up with the pointer showing zero on the balancer. From there drop the distributor in and time it.Darren Quote Selected
low end power disappeared? Reply #116 – January 02, 2015, 11:17:19 AM Quote from: marianadeeps;442334I'll check the codes this PM after work. Yeah, just kept the old stuff -- the spark plugs were new before I did the upgrade.Wait are you reusing the spark plugs from the stock heads? If so then we have a winner! The stock plugs can not be used in Twisted Wedge heads. You need either Autolite 3924 or Motorcraft AGSP32C plugs for Twisted Wedge heads. Theses spark plugs are gasketed long reach plugs. The stock plugs won't work correctly because 1: they are too short to reach into the combustion chamber fully causing incomplete burn/spark knock and 2: they are not gasketed so combustion gases may leak. Get the stock plugs out asap and put the correct plugs for the Twisted Wedge heads in there. Quote Selected
low end power disappeared? Reply #117 – January 02, 2015, 11:48:29 AM Quote from: thunderjet302;442342Wait are you reusing the spark plugs from the stock heads? If so then we have a winner! The stock plugs can not be used in Twisted Wedge heads. You need either Autolite 3924 or Motorcraft AGSP32C plugs for Twisted Wedge heads. Theses spark plugs are gasketed long reach plugs. The stock plugs won't work correctly because 1: they are too short to reach into the combustion chamber fully causing incomplete burn/spark knock and 2: they are not gasketed so combustion gases may leak. Get the stock plugs out asap and put the correct plugs for the Twisted Wedge heads in there. oh wow. that makes sense. an easy fix too. That moves to the top of the list. Thanks TJ. Quote Selected
low end power disappeared? Reply #118 – January 02, 2015, 12:06:51 PM I don't think I could break the tires loose when I went ho to 345 gears, without giving it some brake. It's been a long time ago and many changes, so I really don't remember. Quote Selected
low end power disappeared? Reply #119 – January 02, 2015, 12:40:03 PM A T5 HO car with 3.55 gears has no trouble at all breaking the rear loose. I could even do it at a roll if the tires were cold. Quote Selected
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