LS2 402 short block at SDPC!
Originally Posted by redaddiction
So what about a deal with the ls2 intake and tb how much would all of that set us back with the motor ?
LS2 intake conversion kit $1,375.00
-----------------------------------------
TOTAL $5,370.00
The intake conversion kit includes: LS2 intake, LS2 fuel rail, injector o-ring kit, TPIS 90mm tb (for F body), and the new SDPC billet throttle cable bracket!!
I see u are having a hard time with knock sensors.
I had an idea (Thanks Tom)...
Why not drill 2 holes in the block in a safe area,then weld and tap 2 bungs.U could then screw the LS1 style sensors into the block and make ext harness's to clip onto the factory knock sensor harness.U would now have working knock sensors from your old ls1 and your pcm would read the KR if u had any.I thought it was a smart idea instead of figuring reference signals and running LS2 knock sensors but I guess maybe u can drill and weld a bung to the block?
What do u guys think....
I had an idea (Thanks Tom)...
Why not drill 2 holes in the block in a safe area,then weld and tap 2 bungs.U could then screw the LS1 style sensors into the block and make ext harness's to clip onto the factory knock sensor harness.U would now have working knock sensors from your old ls1 and your pcm would read the KR if u had any.I thought it was a smart idea instead of figuring reference signals and running LS2 knock sensors but I guess maybe u can drill and weld a bung to the block?
What do u guys think....
Originally Posted by JS
I see u are having a hard time with knock sensors.
I had an idea (Thanks Tom)...
Why not drill 2 holes in the block in a safe area,then weld and tap 2 bungs.U could then screw the LS1 style sensors into the block and make ext harness's to clip onto the factory knock sensor harness.U would now have working knock sensors from your old ls1 and your pcm would read the KR if u had any.I thought it was a smart idea instead of figuring reference signals and running LS2 knock sensors but I guess maybe u can drill and weld a bung to the block?
What do u guys think....
I had an idea (Thanks Tom)...
Why not drill 2 holes in the block in a safe area,then weld and tap 2 bungs.U could then screw the LS1 style sensors into the block and make ext harness's to clip onto the factory knock sensor harness.U would now have working knock sensors from your old ls1 and your pcm would read the KR if u had any.I thought it was a smart idea instead of figuring reference signals and running LS2 knock sensors but I guess maybe u can drill and weld a bung to the block?
What do u guys think....
Having the knock sensors disconnected is not a big deal.You just need it tuned correctly.Fords still don't have knock sensors and they have the biggest market in superchargers.I've been running my stock motor'd /supercharged Vette all year without knock sensors.
Originally Posted by Slowhawk
Having the knock sensors disconnected is not a big deal.You just need it tuned correctly.Fords still don't have knock sensors and they have the biggest market in superchargers.I've been running my stock motor'd /supercharged Vette all year without knock sensors.
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TECH Enthusiast
Joined: Nov 2001
Posts: 553
Likes: 0
From: Dallas TX
This was posted in reference to the knock sensors:
hmm, but didn't he try to hook up LS2 knock sensors, installed in an LS2 engine, to an LS1 PCM? I can see why that wouldn't work - the signals from the LS2 knock sensors are currently incompatible with the LS1 PCM
But what about taking LS1 knock sensors, installing them in an LS2 engine, and wiring them up to an LS1 PCM? Has anyone tried this?
OTOH, maybe just screw it - make the tune on the conservative side, keep the compression ratio on the safe side, turn off the knock sensors with LS1 Edit. The extra cubes, LS2 intake and 90mmtb will make up for any power you lost by erring on the side of caution.
BMW didn't use Knock Sensors on E34 M5s - and that was a 3.6 to 3.8 liter I-6 making 315 to 340 horsepower, spinning to 7000 rpm. Fairly high strung engine, and most of them are still running fine at 100K miles and beyond today.
Originally Posted by DrkPhx
There is a sponsor (Andy) from the Corvette forum who tried it and proved the two were not compatible just by connecting them.
But what about taking LS1 knock sensors, installing them in an LS2 engine, and wiring them up to an LS1 PCM? Has anyone tried this?
OTOH, maybe just screw it - make the tune on the conservative side, keep the compression ratio on the safe side, turn off the knock sensors with LS1 Edit. The extra cubes, LS2 intake and 90mmtb will make up for any power you lost by erring on the side of caution.
BMW didn't use Knock Sensors on E34 M5s - and that was a 3.6 to 3.8 liter I-6 making 315 to 340 horsepower, spinning to 7000 rpm. Fairly high strung engine, and most of them are still running fine at 100K miles and beyond today.
Last edited by TTopJohn; Dec 15, 2004 at 10:18 AM.
Originally Posted by TTopJohn
But what about taking LS1 knock sensors, installing them in an LS2 engine, and wiring them up to an LS1 PCM? Has anyone tried this?
-T
Give me a couple of weeks and I will try precisely that. The other thought I have is the LT1 knock sensors that were designed for a block location.
Anyone know if that circuit is the same?? I have enough Helms manuals that I will check the circuit diagram myself here in a few days.
The LT1 KSers worked on a constant +5 v signal. If the microphone (KS) heard knock it interrupted the signal and the pcm took out timing as it had been programmed to do. If that is the same for the LS1 pcm, than the LT1 sensors may work better since they have been built for a block location.
Perry
Anyone know if that circuit is the same?? I have enough Helms manuals that I will check the circuit diagram myself here in a few days.
The LT1 KSers worked on a constant +5 v signal. If the microphone (KS) heard knock it interrupted the signal and the pcm took out timing as it had been programmed to do. If that is the same for the LS1 pcm, than the LT1 sensors may work better since they have been built for a block location.
Perry
Originally Posted by ecthelion
Another sensor that might work is the knock sensor that the Grand Prix uses . . . it is mounted on the side of the block in a similar location to the LS2.
Do you have pictures of the LS2 knock sensor location showing the sensor? I had a GTP for 7 years, so I know what they look like.
DEE
TECH Enthusiast
Joined: Nov 2001
Posts: 553
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From: Dallas TX
Originally Posted by DrkPhx
He did try the LS2 sensors and they did not work.
Originally Posted by TTopJohn
We're talking about trying the LS1 sensors. Or some LT1 sensors, or apparently some Grand Prix 3.8 sensors - whatever works
TECH Enthusiast
Joined: Nov 2001
Posts: 553
Likes: 0
From: Dallas TX
Originally Posted by DrkPhx
He tried it both ways and could not get either to work at the time.
I assume that "just by hooking them up" means he didn't run the enigne and see what happened.
It's just a question of
1) do they fit in the LS2 block ?
and
2) do they report useful information to the LS1 PCM from their location in the LS2 block, or is the noise so different in the new LS2 location that they are rendered non functional?
The knock sensors on the LS2 not only mount in a different location, but they are also a totally different design. If you were able to somehow mount the LS1 knock sensors on an LS2 block they would not work properly because you have to mount them someplace other than the lifter galley.
Andrew
Andrew
OooooOooOoo !! 
Boy has this ever sparked my interest. I wanted to go bigger cubes on the next project...
Just to clarify - I can pop my heads/cam/accessories onto this shortblock and vrooom off I go ? Tuning change required probably ? What about injectors (my '99 26#'ers are very close if not maxed at 410rwhp).
Hmm, maybe should just go with the LS2 intake/rail setup and some new injectors from Texas Speed...
What an unbelievable deal ! Any guesses what kind of hp/tq some Stage II 5.3 liter heads (milled .030) with a 222/224 cam would make on the 402 ?
Thanks !!
Bad30th
Boy has this ever sparked my interest. I wanted to go bigger cubes on the next project...
Just to clarify - I can pop my heads/cam/accessories onto this shortblock and vrooom off I go ? Tuning change required probably ? What about injectors (my '99 26#'ers are very close if not maxed at 410rwhp).
Hmm, maybe should just go with the LS2 intake/rail setup and some new injectors from Texas Speed...
"SDPC 402 short block $3,995.00
LS2 intake conversion kit $1,375.00
-----------------------------------------
TOTAL $5,370.00
The intake conversion kit includes: LS2 intake, LS2 fuel rail, injector o-ring kit, TPIS 90mm tb (for F body), and the new SDPC billet throttle cable bracket!!"
LS2 intake conversion kit $1,375.00
-----------------------------------------
TOTAL $5,370.00
The intake conversion kit includes: LS2 intake, LS2 fuel rail, injector o-ring kit, TPIS 90mm tb (for F body), and the new SDPC billet throttle cable bracket!!"
Thanks !!
Bad30th
Last edited by Bad30th; Dec 15, 2004 at 07:21 PM.
Originally Posted by TTopJohn
It's just a question of
1) do they fit in the LS2 block ?
and
2) do they report useful information to the LS1 PCM from their location in the LS2 block,
1) do they fit in the LS2 block ?
and
2) do they report useful information to the LS1 PCM from their location in the LS2 block,
Maybe Kris and Mikey are right to just tune the car conservatively and let it go at that. Which leads to a different question of: Who runs a LS1/LS6 stroker without knock sensors?
In all honesty the knock sensors have always given me fits of false knock, so maybe just tune them out.
