Lt1's are basically just short runner TPI setups, where as LS1s are completely apart. Plus the LS1's have a totally different firing order than the standard SBC. Actually its said to be the same as ford, which explains why LS1's are closest sounding chevy motor to a mustang. I think they sound great. Nothing wrong with an LS1 sound

Will

 

i think the ls1's (or lsx's really since they have mroe coming) sound different just because (like stanghunter211 said) they have a different firing order and also because they're blocks are aluminum, whereas tpi and lt1 setups are cast iron

 

How are they completely apart.. are they MPI or no?

What the block is made up of, and the firing order are gonna alter the freakin' exhaust note?? Why?

What is a TPI setup.. long-runner or short runner?
LT1's are always short-runner?

 

TPI has a LOOOOONG runner.

Like I said before though LS1's had a
noise tolerance limit set during development.
They were made to be quiet.

 

Yes, changing the firing order will affect the sound emitted. Also LS1's are a completely different design of motor. They have nothing in common with any previous SBC except maybe the fact that gm went back to a belt driven water pump after the LT1's design.

 

How were these "noise tolerances" created though.. how do you "make" something to be quiet, except for maybe an exhaust?

What is the relationship between runner length, and performance?

How does firing order affect the "sound" of an engine? How are LS1's a completely diff. designed motor?

 

Come on man, go to the LS1 tech section and ask maybe they can answer you. Its alluminum for one, second the heads are redesigned, they won't fit a standard sbc, the block is not compatible with any sbc parts, the intake manifold is totally different, it uses coil packs instead of a distributor.... ITS JUST DIFFERENT

Long runner design equates to more low end torque and loss of high end hp, which is why most lightly modded L98's will take an equally modded LT1 off the line, but the LT1 will catch up and pass about half track down the 1/4 mile

And firing order does affect sound, I don't know how, but it does, i've heard the difference

Will

 

Sorry.. it's just we were talking about it on here, and I had like.. 60 seconds total time to read and reply, as I had stuff to get done.

Thanx for the explanations though, Will.. I will try to use the appropriate forum next time for my question.

Matt

 

Nah, just seems like you have some good questions that would be more thoroughly answered in the LS1 tech section, I don't know much about the LSx engines, and those guys do! Good luck

Will

 

Well, you, as well as the other guys, knew what ya'z were talking about, so I figured I would just keep asking (lol). But I get your point.. thanx again.

 

Yes exhaust will effect it-every part from manifold back
but also things like cam/valvetrain

Why can't an LS1 be totally different. Just like a
Chevy 5.0 305 is different than a ford 5.0 302.
LS1 has a different block, totally different design
with bank to bank flow, dry sumps, main bolts.
LS1 is Aluminum. LS1 has totally different bore and
stroke=346CID not 350. Different pistons,valves, pushrods
etc, etc, etc. It be easier to name one thing in common with
TPI. YES is in multi port-pretty much every thing is now.
TPI was realitily new at the time which is why it is so
seen on the car. EFI is almost always listed as tuned anymore.

Runner length is generally associated with low end TQ
TPI is 26" give or take. LT1 is 3". So it seems LT1
would be a higher runner yet the knock on LS1 is less
low end TQ of the 3 while its runner is 16".
Its been awhile since I read those #'s but I know they're close.
The point is there are alot of other factors. And as everyone
whos had a TPI knows the knock is you can't fill them fast
enough at high RPM so the car doesn't pull strong to the redline
while LS1's get scarier and scarier as the RPMs soar.

 

I knew the Cam can change it.. but how does the manifold change it?

I always thought that the MPI Camaro's were crap.. were they?

No matter what you do?

 

How is MPFI crap? Most systems are that, unless its some rail direct or other efi setup. Are you talking about those gay 2.8L MPFI camaros back in the 80's that had that badging?

OK any change in shape, size, or WHATEVER will change exhaust sound. There are ways to optimize exhaust flow and power w/o increasing sound levels. Its been this way for years and years.

 

And there are ways to get more top end out of em, IE change the runners to a shorter SLP or Accel style runner. But they will never be as effective in the top end as say an LT1 unless you do away with the TPI completely and switch to stealthram or superram. It costs way too much to get minimal benefits from porting on a stock TPI. You could get much more power up top from an aftermarket system

Will

 

No, I think they are 305's, maybe 350's, from the mid-80's to the early 90's.. but I am unsure.

Rail Direct is crap? What do the LS1's use?

Thanx for clarifying that.. now it makes a bit more sense.

What kind of Fuel Injection are these 2?