ok heres my list of things i have to build my spare motor for my 2003 cav im shooting for around 315 maybe a solid 300
LSJ internals
2003 SAAB intake mani. and turbo mani
godspeed intercooler
walbro 255
custom DP zeitronix wideband boost egt package my question is what tuning should i go with HPT or mega squirt
and what injectors would i need
what the fck is your problem
Really....
Explain yourself....
LSJ internals in a L61..HOW???? different stroke, bore, and compression, not to mention a completely different oiling system...
You are either a newb who didnt search, a troll, a complete MORON, or all three...I am voting all three!
EVOFire {DesertTuners} wrote:Really....
Explain yourself....
LSJ internals in a L61..HOW???? different stroke, bore, and compression, not to mention a completely different oiling system...
You are either a newb who didnt search, a troll, a complete MORON, or all three...I am voting all three!
you cannot mix and match the internals.. the rods pistons and crank have to be moved as a whole, but you would be able to swap from one to the other no sweat. the L61 and LSJ have the same bore.
however, the reluctor ring on the LSJ crank would be the problem.. which is why I had to goto a full stand alone with the LSJ/L61 hybrid I'm making.
compression is different, but better for boost.
flywheel and clutch are different, which (I think) necessitates the LSJ trans spacer.. still not sure on the issue since my car hasn't actually run yet
oiling system is similar, the LSJ block has integrated piston cooling jets. The L61 does not.
one question i've been pondering is if the deck height of the LSJ and the L61 is the same, I haven't taken any actual measurements yet.. and I have no idea what the answer is.
If the measurements are different, then compression will change using LSJ internals in the L61
but the moral of the story is, it won't work because you need to use the internals as a unit (pistons, rods and crank) and the LSJ crank will not work in the jbody without some further modifications (trans spacer, and stand alone EFI -OR- a custom machined reluctor ring). The reluctor ring on the LSJ is bolted on, but the one on the L61 is cast into the #4 counterweight.
not to mention, you'd also have to re-time the cams for the 2.0 crankshaft since the piston to TDC relationship changes with the stroke change, throwing off the mechanical timing so add GM racing cam gears to the list as well.
the idea is sound, but not as simple as it seems... wiseco pistons and eagle rods is a much easier and (ultimately) cheaper solution
I chose to use the LSJ not for its factory strength, but more as a cheaper way to de-stroke the ecotec for a better rod ratio and rev capability.
pj why do you have to sound so damn smart all the time...
either way he's a troll....
pj makes me horny with his smarts
LE61T PTE6262 Powered 
all of pjs and skunks post i've always took to head and was like damn i wish i could be like them haha n neither of them like me
okay thanks pj ive been following your build for quite some time now in fact tha only reason i even look at this sight is because of that build so
keep up the good work on that
i wasnt even sure if the LSJ internals woud fit and now i know but i do know the manifolds fit so when i dig into my L61 pistons and rods are all i need change i figured the crank would have to go also
now back to my other question what tunig program should i go with the hpt (im liking that one more and more)
or a mega squirt
and also the inector size i need is still a mystery to me
and i did search tje injector question
Start with 60lb/hr injectors. If you have a good tuner, you can get it to idle and run part throttle without problems. Plus you have a buffer to grow if your power goal is 300whp
ok so any ceratin brand i should be looking for
if ur doin turbo go straight to megasquirt don't waste your money on HPT.
and just as a finalization to my above post, the flywheel on the LSJ is 8 bolt while the L61 is 6 bolt. the clutch diameter for the LSJ is also larger, so you cannot mix and match the clutches/ flywheels between the two.
You could have an L61 flywheel drilled out for the LSJ, but you'd be going in circles because the LSJ clutch is going to ultimately have more holding capacity due to its larger usable diameter (overall dia. is the same, but the clutch surface itself for the LSJ is larger).
Edited 2 time(s). Last edited Friday, May 29, 2009 4:49 PM
