Stuff you need to switch over to an LSX platform.
- Thread starter blazeracer
- Start date
blazeracer
New member
FormulaZR said:
Yeah, now that I'm getting to where I need to get it hooked up it looks to be a royal pain. I need a TAC (Throttle Actuator Controller) module . I was at the wrecking yard last week and the Tahoe I got my motor from had the DBW pedal still in it, but I have no idea where the module I need is located and there are HUGE harnesses running everywhere in the interior. There was a module of some sort under the drivers seat. An 01 Silverado showed up there that has the ECM and cable throttle body in it. Problem solved maybe? I'll bet I can use my Glastron's hand throttle too.
ChryslerJet
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That sounds like it might work better than using DBW otherwise another thought I have is use the DBW in a different way by using hot foot with a cable and have that control the dbw in the engine area. No need to worry about an extended wiring harness still would need the right module though.blazeracer said:
blazeracer
New member
spd500 said:
Maybe, I'll let you know. I'm heading to the junk yard now to try and find this TAC thing. It SHOULD be mounted to the firewall with a weatherproof plug about 10 inches from the module, a module with TWO plugs on it. If I find it I'll get it with the gas pedal, then...........
ChryslerJet said:
..... rig up something like this with my hand throttle. One of a kind baby!! Great idea. You and that Pontiac guy are great sources for "outside the box" ideas since your boats are morphidites that needs eveything to be one off. LOL
I may send you $20 for all the EFI crap anyway. A lot of the stuff on mine got busted pulling the motor out. I know I'm gonna have to replace the MAF and the fuel crossover already. Do you have the PCM also? My DBW PCM won't work with a cable TB.
ChryslerJet
New member
At least I am good for something. Definitely can think outside the box. Helps to be a fabricator as well then I can build anything I can dream. Hmm makes me think what about a heli motor and blades in a boat so you can park in the parking lot turn on the heli motor and blades lift the boat off the trailer set it down in the water and start the jet. Would be awesome to see it. Would have to have telescoping and fold away blades and shaft.blazeracer said:
blazeracer
New member
Well, I know now why I couln't find the module on the Tahoe I pulled the motor from. It's gone. There was a Suburban there that had caught fire but has the entire front end stripped off. There was the module, melted... Just as I was about to give up my search and head out of the junk yard I spotted a side swipped Yukon that wasn't there last week. BINGO. Got the DBW pedal with the module for $50.
It's got a complete 5.3 in it if anybody needs one but it's kind of squashed on the right side. This one got hit hard.
It's got a complete 5.3 in it if anybody needs one but it's kind of squashed on the right side. This one got hit hard.
blazeracer
New member
FormulaZR said:
There is a module in there between the ECU and the pedal. Where is the long run? From the pedal to the module or from the module to the ECU? Most likely from the pedal to the module. My harness has the module plug in it already and there is only about 2 feet of wire there. I may go with a larger gauge wire for that long run so there's no voltage loss. The redundency system is nuts on those. They needs THREE signals to work properly.
Read a little on the DBW trouble too. There is a history of problem with the yellow wire coming out of the either the pedal or the TAC module causing the TB to only go to part throttle. He can check if the yellow wire is spongy. If so replace that section of wire and the part throttle problem may go away.
ALSO, found out the the ECM, TAC module, TB, and pedal have to match. Don't know what year his is, but my motor/ECM/TB is a 2001 Tahoe, the module and pedal are out of a 2000 Yukon. 2000 to 2002 ARE compatible but they have to be from the same series of vehicle. Can't use a Vette or Camaro parts with truck parts for the four pieces necessary with a DBW system.
ChryslerJet
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Wow sounds like a headache
blazeracer
New member
Yeah, but when it works, it's sweet. I'll have it on mine in a few more weeks here.
blazeracer
New member
ChryslerJet said:
Tell me about it!
The sender in the gas pedal sends out three signals the TAC has to verify. The first check is for voltage up from 0.5 to 5. The second is voltage down from 5 to .05. The third is an Ohm measurement. The TAC module take all three inputs and tells the ECM to open the throttle body X amount. It does this like 500 times per second. If any of the three outputs from the gas pedal don't jive with what the TAC should be reading in it's table, the TAC tells the ECM that something's not right and you get limp mode. I guess that's how they prevent an uncontrolled WOT like the Toyota's allegedly have had happen in the past.
blazeracer
New member
Talking to myself here just to get the info in writing where it won't get lost.
Rotating assembly torque
Rod Bolts. 15 ft lbs + 75 degress
Inner main bolts, 15 ft lbs + 80 degrees
Outer main blolts, 15 ft lbs + 53 degrees
Side bolts, 18 ft lbs.
Oh hell, here's the link for all LS1 torque specs. http://www.ls2.com/boggs/torques/enginetorques.htm
Rotating assembly torque
Rod Bolts. 15 ft lbs + 75 degress
Inner main bolts, 15 ft lbs + 80 degrees
Outer main blolts, 15 ft lbs + 53 degrees
Side bolts, 18 ft lbs.
Oh hell, here's the link for all LS1 torque specs. http://www.ls2.com/boggs/torques/enginetorques.htm
blazeracer
New member
Getting your cam ground forces a longer pushrod. $100 for a set from Scoggin Dickey that are .025 longer than stock. Option B, take my FREE Covette heads with the larger chambers and larger valves, and get .025 milled off for $40.
Good idea?
Good idea?
blazeracer
New member
FormulaZR said:
Damn, just read this.... 81 in a small block powered 21 foot 4 seater. Nice.
blazeracer
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spd500 said:
Done. $35 a head.
blazeracer
New member
Sharkbit said:
Makes you want to put that LS1 in your boat, huh Chad?