Are there any larger OEM throttle bodies that I can slap on a stock LS1?
Visiting the junkyard tomorrow, and I vaguely remember that certain trucks had larger cable operated tb's
Are there any larger OEM throttle bodies that I can slap on a stock LS1?
Visiting the junkyard tomorrow, and I vaguely remember that certain trucks had larger cable operated tb's
The cable throttle bodies are 75mm, same as the drive by wire LS1 unit. You can find them most easily in 6 liter Express vans because the pickups went to drive by wire after only a year or two. Express were cable until 2004-ish.
No.
LS1/6/4.8/5.3/6.0 Throttle bodies are all the same size 76mm, and come in DBW and cable.
later they switched to DBW and they got bigger, LS2 is 90mm and trucks got 90s or 85s I cant remember.
there are other changes like 3 or 4 bolt mounting, pivot direction of blade and dbw connectors.
I dont believe there are any cable driven 85 or 90mm tbs, even if there are the ls1 intake opening is just a little bigger than the 76
LS1 are 3 bolt, LS2 are 4 bolt. I don't think any (OEM) cable LS2 style throttle bodies exist.
Fun trivia - the throttle body from a Vortec 5.7 is the same bolt pattern as LS1 but with a smaller bore and a different cable attachment. And when you keep calling around trying to get a throttle body from an 6.0 van, and they keep sending 5.7 throttle bodies instead, it becomes much easier to just buy a new throttle body from Summit for like $200-250 or so.
Bumping this cause I was doing research on LS throttle bodies for the LS4.9 and GRM popped up.
With the DBW setups, do I have to grab the pedal from that vehicle, or can I adapt something later on? Planning on an aftermarket ECU like a Megasquirt.
I planned for a 90mm throttle body, from what I've been reading lately that won't be hard to find.
In reply to Mr_Asa :
Grabbing the matching pedal is a big deal with stock ECU LS swaps, on standlone ECUs you should have a little more leeway on which pedal should work. Check that whatever standalone you go with supports DBW, a couple years ago when I was last looking Megasquirt didn't support DBW which has a big factor in me choosing Holley.
Gen4 truck throttle bodies are in the 87mm range and stock LS3 Camaro/Corvette are 90mm.
In reply to RacetruckRon :
I wonder if anyone has modified a DBW system for cable operation and a TPS.
Based on this website, I should be looking for cars newer than '08? http://www.thelsxdr.com/ls-throttle-body-guide/
You can use a DBW controller like This with a MS3 ECU for a DBW throttle body. One option for Megasquirt and DBW, but it only works with MS3 based ECUs.
Also, the 8.1L engines used a fairly compact DBW throttle body, it doesn't have the motor part hanging off the side like some others do.
In reply to 81cpcamaro :
Woof. 480 Euros? Trying to do this on a Challenge budget level.
Maybe I can find another option.
You can buy cheap 90mm DBC throttle bodies on Amazon or eBay for well short of 100 dollars delivered.
Mr_Asa said:In reply to 81cpcamaro :
Woof. 480 Euros? Trying to do this on a Challenge budget level.
Maybe I can find another option.
Gm had a separate dbw called a tac unit. Never used one though.
That being said the dbwx2 can be used totally standalone from the engine ecu if need be. Or over ms can.
In reply to Paul_VR6 (Forum Supporter) :
The older computers (the "blue/green", with a 24x crank) used a TAC, I assume because they didn't have the processing power to control the throttle body in the computer. I am fairly certain this is only used with three bolt style throttle bodies that have two connectors. The TAC needs to match up with the computer, and if you play games in the computer with throttle opening curves you can brick things if you go too far.
Generally, anything with a four bolt throttle body/one connector (and 58x crank) has the throttle control done internal to the ECM (separate TCM on those) and there is no TAC. I'm sure there are exceptions. I remember that the GTO was weird in some way and I can't recall exactly how.
Generally speaking, if you are going drive by wire with a TAC style system, you want the TAC and pedal that go with the PCM.
Having to screw around with all of this with a swap where you have to play mix-and-match is a good reason to go cable throttle.
In reply to Knurled :
My 06 Express is cable operated
In reply to Pete. (l33t FS) :
Agreed. Google will tell you which ECMs work with which TB. Many of the ECMs for electric TBs lack the driver for IAC since that function is handled by the TB.
From what I understand, Express/Savanna is the holy grail. Most of them evidently have ECMs that have all the possible combinations for TB, IAC, flex fuel, etc.
There is a lot of information regarding high performance throttle bodies at https://www.solerengineering.com/
I have been using one of these on my LS3 for 5 years. Veteran owned company, $140.
They also have a 3 bolt to 4 bolt adapter.
Mr_Asa said:In reply to RacetruckRon :
I wonder if anyone has modified a DBW system for cable operation and a TPS.
Based on this website, I should be looking for cars newer than '08? http://www.thelsxdr.com/ls-throttle-body-guide/
Hot Rod Magazine converted a 5.7L Hemi DBW throttle body to cable drive by popping the over off the side and cobbling a rotary plate onto the throttle shaft. Pretty? No. Cheap? Yes. And it held up to 10psi of boost, so likely robust. Could be done on an LS one, I would think.
81cpcamaro said:You can use a DBW controller like This with a MS3 ECU for a DBW throttle body. One option for Megasquirt and DBW, but it only works with MS3 based ECUs.
Also, the 8.1L engines used a fairly compact DBW throttle body, it doesn't have the motor part hanging off the side like some others do.
At first I was like, oooh!
But then I realized, for the price of an MS3 and that module, you can buy a Link that does the throttle control natively, AND has onboard wideband control.
I have been super happy with my chinesium 102mm off fleabay for $100.
Pete. (l33t FS) said:81cpcamaro said:You can use a DBW controller like This with a MS3 ECU for a DBW throttle body. One option for Megasquirt and DBW, but it only works with MS3 based ECUs.
Also, the 8.1L engines used a fairly compact DBW throttle body, it doesn't have the motor part hanging off the side like some others do.
At first I was like, oooh!
But then I realized, for the price of an MS3 and that module, you can buy a Link that does the throttle control natively, AND has onboard wideband control.
Spendy but with the dual processors and the miles we have on them, I am satisfied. I don't use bosch widebands on much so that part isn't much gain anyway, if I do use them I use a few.
In reply to Paul_VR6 (Forum Supporter) :
I'm approaching wrench time on my VW, and the main sticking point has been engine management. Having worked with FAST XFi systems, I really like having the wideband controller integrated with the computer. I had been thinking of trying to find a used MS3Pro because I don't like the Evo/Ultimate for reasons, and I don't like the noise levels on the old non-Pro circuit boards. But the kicker now is that I've decided that drive by wire would be nice, and a Link that does everything I want is $1700ish.
Not sure what reasons for not Evo/Ult as I have had a gen1 and both of those in my car (and lots of others). I use the ngk sensors on most of my installs and the lsu capability is just a waste.
I really like the tools built into ts/mlv as it allows very quick remote tuning once you set up a few filters. I have tuned a few other "budget" systems and all are an order of magnitude of a pita.
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