F1camaro95

I was told that the LS1 makes more hp stock over the LT1 is b/c it has a bigger cam and better flowing heads than the LT1 does stock.....Say if you had a similar size cam and similar size flowing heads on both cars....what would be the HP difference. I mean mostly big heads big cam LT1/s on here ive seen make around 410 RWHP...but LS1's have about 450 RWHP

NVetro

Since when do LS1's have 450rwhp Stock? If you strip down heads and cam, in the end its still a small block chevy, so sure they make the power from the larger flowing heads, and the cam. Cus its not from displaclemt.

93turbo5oh

the only thing the LS1 has in common with every other gen1 and gen2 small block is the rod bearings. nothing else is the same.

ive got a buddy with a stock 02 m6 ws6, hes got a lid, a borla and gutted cats. it made 337rwhp. my lt1 has the mods in the sig, we run door to door on the street, and i actually win from a 70 roll because he has 4.10s and has to shift to 5th at 115 so i get a car length on him and keep it. ive never dyno'd my car, so i dont know what it makes. his car is really strong, appearantly so is mine. they are pretty equal, but i dont think i could run with him without my headers. as a general rule the ls1s make more power stock.

teke184

several things are difficult to compare.

one being the intake...the ls1 intake flows much better than the lt1

another is the design of the heads allowing higher lift cams. most lt1 cams seem to be .500-.550" lift, where most ls1 cams are .575" or more

i think if you put identical cams in both engines...say the hot cam...and had heads that flowed the same at around 290intake

i think the ls1 would still win out

frmula1

my 95 formula had 275 stock... and my ws6 has 325... many have told me its actually 345... with... for what they dyno stock... accounting for drivetrain loss... is just about right... i know from the numbers and the feel (especially at higher speeds) my ls1 is MUCH faster

93turbo5oh

as far as the intakes are concerned, i have some flow numbers that might suprise people. the ls6 intake on a set of heads (that flow 320@28" at .600) lift only flows maxes out at 290 at .600". the ls1 intake even less. what the lt1 intake gives up in out of the box port cross sectional area it makes up for with a short runner.

nobody is making newer lobe designs for lt1s. thats part of the problem. as far as if all were equal, it would probably be a wash if they were both stock short blocks. the ls1 has a smaller bore and a longer stroke, which means its going to have more ring friction then the same engine with a bigger bore and a shorter stroke. but, i think the design of the ls1 has better friction reduction throught the rest of the engine. the small bore thing was done to keep the unburned hydrocarbons down.

frmula1

i think my car has the ls6 intake manifold..?


anyways if we're talking stock for stock.... there is no debate.

blind527

Why did GM underrate the HP ratings between the 98+ ws6's and SS's? Why didn't they do this as well with the 97 and down? I would imagne that LT headers, ORY, cat back, CAI, and a good computer tune etc. on a LT1 would be about the same as a stock LS1?

I know LS1's have a higher powerband though.

frmula1

because the standard vette at the time was making 350hp... they didn't want a car selling for almost half the price of their flagship to be rated a mere 5hp down from it...

as far as the power band being higher... def. my ws6 pulls the same from 50-100 as it does 100-150

in my formula... i lost all my races at the 100mph mark it was all over

93turbo5oh

when my car was bone stock it punched a couple stock ls1s in the mouth. from a dead stop and on the freeway. a strong lt1 will outrun a not so strong ls1. but there arent many strong stock lt1s out there.

frmula1

what i was saying... is i think my 02 came stock with the ls6 intake... as far as your races... im not gonna say your lieing... but the guy you raced might have screwed up or not downshifted enough etc... i have had both.... loved ever minute with each... but theres still no denying ls1s are faster motors

BlkLT1Z28

[QUOTE=93turbo5oh]the only thing the LS1 has in common with every other gen1 and gen2 small block is the rod bearings. nothing else is the same.
QUOTE]


I do believe the only in common is the bore spacing, that is it. No other parts are interchangeable.

LS1 heads are 200cc stock
LT1 heads are 160CC stock LT4's were 180 I believe.
LS1's have a little bit more cam in them,
LS1 have better Rocker arm ratio
LS1 have a better intake
LS1 have Way better exhaust (F-body cars stock manifolds)
And As we all know LS1's have a better ignition!

As far as the same head size with the same size cam..... they would both probly make the same amount of power but the only difference will be where the power is at. The LT1 will have a strong bottom end and mid range(as long as there not Huge H/C's) where as the LS1 will come alive mid to top end. That is due to the fact that they have cathedral intake ports that will flow just a little more, its more of a straight shot at the valves and the LS1 has a lighter valve train(beehive springs, hollow stem valves). So that enables them to rev a little higher. And then the intake flows better on an LS1. It would be VERY interesting to see this on a dyno though. But it seems like in the long run when cam and heads start to get bigger the LS1 starts to make a little bit more power while not being to radical. ie a cam ground on 112lsa with a XE profile like the 224/230 with a Identical flowing set of heads and I think the LS1 will take it. But I still love my LT1

Compstall

Vettes didn't make that much more power. I've watched a stock automatic '95 Vette run on a dyno and pulled 247 hp at the wheels. Their power/weight ratio is what makes them faster.

....AND, it's always better to be underrated than overrated. Ford went through that issue with the Mustang back in '00 (???). For the most part, the LT1 is also underrated. Back when I had only a CAI and a cat-back exhaust my Z threw down 283 hp and 321 torque at the wheels, being rated at 275 crank hp from the factory. Figure in drivetrain losses and I'm certain that I didn't gain 30-40 hp at the wheels with only those two mods.

blind527

Maybe you had a freak?! I know Mustangs are underrated, and it is better to be underrated than over. I just thought they would give its TRUE HP rating. Those are some good numbers man. I wonder what my car has with my mods, but I don't want to waste 75 bucks getting it dynoed! I'll dyno it after I put headers on and let you guys know!

stereomandan

Once you get into the heavy modded engine, the LS1 and LT1 get close in performance. Bolt-on LT1 to Bolt-on LS1, the LS1 will win. They will typically be 35-40 rwhp more than a LT1 with similar bolt-ons.

Dan