Which would be cheeper; LS1 FI or LT1 FI?

[CALL911]

Which would be cheeper if you had to build everything from the motor up and wanted to do the same sized turbo with a fully built motor. Building the motor and all the supporting units for the LT1? Or the LS1? This is specifically for if you bought new parts (not used).

Looking at some of the options available now for the LS1 I am almost thinking it would be cheeper for the LS1.

Breaking it down, I beleive the hot parts, and the turbo itself should be the same on either car, along with the standard for some form of intercooler and or meth injection. It really should just break down to the motor.

What do you think?

[The SRZ]

LS1 cheaper w/out a doubt. Not by much but we both know the outcome if they're both built w/ the same cubes and boost. LSX will outshine the LTX just because of the heads alone. Still, blown LTX's are cooler. :D

[skinnies]

A few things to keep in mind, with an lt1 if you go turbo you really need an aftermarket pcm setup if you want to make big power, where with an ls1 you can us hptuners and a 3 bar setup or efilive on th stock pcm.

Also the ls1 is gonna lift the heads A LOT more easy.

All depends on your power level you want also, if you want 600rwhp or less(with an auto), simple, do a stock 5.3 with a cam in it and its a lot cheaper, I know because I've built both turbo ls1's, lt1's, and now 5.3's.

[black hawk]

flip a coin :monkey: ,... both have their own issues regardless

[CALL911]

I'm talking about an all out build here (4 bolt mains, fully forged, ect.). The thing that I think gives the LS1 the edge is just the vast options you can do, like the 5.3.

[MoeHorsePower]

A few things to keep in mind, with an lt1 if you go turbo you really need an aftermarket pcm setup if you want to make big power, where with an ls1 you can us hptuners and a 3 bar setup or efilive on th stock pcm..

What do you consider big power? I made 722 RWHP on a stock PCM, forced inducted, and I am now going for 850 RWHP.

[AChotrod]

Also the ls1 is gonna lift the heads A LOT more easy.
Is that because LS1 only have 10 head bolts vs Lt1s 15 per side? Well at least those are the numbers stuck in my head lol

[96lt1m6]

ls1 is much cheaper than an lt1 however the Lt1 gives the




pimp factor, i have both not completed

[CALL911]

Big power (is agreed to be specific to each individual), lets call it 700+ RWHP.

[skinnies]

What do you consider big power? I made 722 RWHP on a stock PCM, forced inducted, and I am now going for 850 RWHP.I was talking in the 900-1000+ range, either way the stock pcm on a TURBO lt1 is junk imo if you are making big power. Yes it can be done, been there done that, but it's just not a great way to do it IMO.

I plan on being in the 625-650rwhp(thru an auto with a huge stall) with a stock junkyard 5.3 this year.

As long as the tuneup is good I don't see it being a problem staying together either, just pulled apart my 5.3 from last year, about 7k miles of a HARD life, thousands of WOT hits, and probably when turned up was right around 640-650rwhp when it was in my friends 3rd gen. The pistons/rods/rod bearings looked perfect, only reason it came out was the thrust bearing died when a cheaper converter ballooned and killed it. Hell it even had quite a few long pulls on it, from 20-50mph to 175-180mph.

If you only want 700rwhp and want to spend a lil money, simple forged 370 with stock 317 heads and a turbo will get you there without a problem and should keep the heads down. You could build it for fairly cheap IMO.

[Fastbird]

I think the LS1 would be cheaper.

The LT1 would have required conversion machining for 4 bolt mains, added costs for 4 bolt main caps for starters vs. the 6 bolt main setup STOCK in the LS1. Ported LS1 heads are MUCH cheaper than ported LT1 heads, stock or aftermarket for the most part. Ltx would require an aftermarket PCM. Ect.

[CALL911]

^ Thats along the same lines of thought that I was thinking.

[MoeHorsePower]

Well go and buy your after market PCM, Like I said I made 722 RWHP on my Stock PCM and I plan to make 800-850 with the same stock pcm and a turbo, I have a customer that is making 760 RWHP with a stock pcm/turbo. Can be done if you know what you are doing, I did this over 10 years ago. Back then and now every one said that was BS, that you could not run more than 7lbs of boost on a stock pcm, I ran 12-14 lbs. I also removed the supercharger and drove around with the 85lb injectors NA, again everyone said that was BS. I even got 25mpg on the highway..Its not the PCM's limitation of horsepower its the RPM level. If you plan on going over 7200 rpm's then yes go aftermarket, but with forced induction I dont think you will be getting anywhere near, My power was all in by roughly 6000 rpm...

[CALL911]

The stock LT1 PCM will only get you so far. For example, my Z in my sig is all on the stock PCM and it is tuned well, however there is really about nothing more it could do. I am sure I could up the power by changing some things (larger heads, different cam), but it is maxed out, and is very difficult to do tuning wise.

LS1 PCM's are much more capable of fine tuning (especially the later years).

The PCM is not really what this thread is about specifically. I was MOSTLY refferring to the engine components themselves.

[MoeHorsePower]

The stock LT1 PCM will only get you so far. For example, my Z in my sig is all on the stock PCM and it is tuned well, however there is really about nothing more it could do. I am sure I could up the power by changing some things (larger heads, different cam), but it is maxed out, and is very difficult to do tuning wise.

LS1 PCM's are much more capable of fine tuning (especially the later years).

The PCM is not really what this thread is about specifically. I was MOSTLY refferring to the engine components themselves.

Yes agreed, LS1's pcm is the way to go, I know this it not specifically about PCM's, I just wanted to let people know that for a certain goal you do not have to spend anymore money than necessary, (and we all need to save some money). I have seen post where a person only wanted to run like 7lbs of boost then others chime in telling him that he needed an after market setup, Really a waste of money at that power level.... Good luck with your build and keep us in touch....

[CALL911]

^ I'm not building anything. I mearly started the thread for opinions and info.

[Fastbird]

Moe.....I understNd what you're saying. I brought the aftermarket PCM into the mix because to get an LT to the same power as an equally equipped LS, I'm thinking that the positive side of 2Bar is needed which seems to be a sketchy think on the LT PCM.

[MoeHorsePower]

You cant go wrong with an after market setup, Much better than the stock PCM, and with better resolutions, probably make a little more horsepower.....