i was just reading of a 406 ci ls1 making 530hp on motor...my question is why cant lt1 make this came kinda power...i understand most guys do 383 lt1 but if they are lucky they make 450hp...what give for the 100 hp differance???that ls1 wasnt even made for motor only, he was just about to add 125shot...and i dont think it was a solid roller or anything...what gives
daniel

 

diffrent combo's heads/cam/cubic inches/compression

my lt1 is a 396 and hit 557 hp n/a with a small cc306 hr

 

LT1 a slouch? Some examples

Ed Wright 383 LT4 heads and intake, about 610HP, 508 to the wheels, through a 4l60E, runs 10.20's at 3350lbs all motor.

Mindgame(on this board) 383, old style 18* heads with a LT4 intake about 670HP, 570 to the wheels, runs 9.70's in street trim all motor.

Clyde Moore, 383 , stock head castings, Holley Stealth Ram, HP? ET=10.40@3350lbs All motor. Had some more left in it..but he went EZ street racing.

Shaun Herron, 355 inches, six speed, stock intake,stock head castings, ET is 10.90 all motor.

Stefan D, 10.80 motor, 9.40 spray

Benjamin Moore over on LS1Tech, 396, stock ECM, about 560HP, 467RWHP, ET 10.18@132 all motor.

Just to name a few

As far as the 100HP difference, the LS1 comes with a 15* head from the factory, but doesnt help them much at the track for some reason??


CHeck the Fastest LT1 list in the drag racing section


David

 

In otherwords Daniel YOU are the one not up to speed not the LT1, the LT1 does make the numbers if setup well.
The LS1 does come with 15 degree heads and if we go through the trouble of fitting gen1 yes gen 1 18 degree heads we can easily be right there with the LS1. It is mostly the LS1 guys and the newbies that think the LT1 is a slouch sure does confuse the locals when their mildly modded LS1 is looking at my tailights for 2/3rds of the track when I have a grandpa car with a VERY mild cam and at the time no friggin headers. They don't think that can be because they like you want to believe the LT1 is incapable of making power. Before the headers they often ran me down before the 1/4 but if it were an 1/8 mile I would beat most of them even with me on street tires.
My cam is 10 degrees smaller on the intake side than the HOT cam before the headers and cat delete I could have passed it off as stock the headers allow you to now slightly hear the cam. I have gone 8.3 in the 1/8th only making about 350-360 flywheel in a 4300lbs car so the crappy old LT1 seems to be doing something right even if it isn't huge dyno numbers.

 

If you can afford it, converted SB2.2 heads

 

o i kno the lt1 is no slouch...i love mine and know power is just power i truely believe it is all in the setup...i was jus wondering why i hear of us barely breaking 500hp...and i jus read os this guy makin 540 through a not completely race all motor setup...
are most of these guys listed above solid rollers?
daniel

 

How much of the 450+ hp LT1s are streetable/daily driver? I wouldn't think any.

 

If it's NA then most likely not, but some people can push 600 HP with a turbo or SC and still have it act like stock around town.

 

A.....mine.......

http://video.ls1tech.com/Player.aspx...3&term=lt1&p=1

The trick is Cubes, compression, right gearing and not to crazy of cam....

Stalled auto and 3.73 12 bolt! Next some break in time, change air ducking/MAF and dyno with a cooler intake manifold (every run was 140 degrees, No cool down)

 

a large part of it is just that the LS1s start higher, so it takes less to raise it to the same HP

 

you are very wrong

i could drive mine everywhere i wanted to go but i choose to save it for the local spot and the strips on weekends

vid in sig

 

Also comparing PEAK numbers means little the LS1 tuned intake means higher peak numbers the LT1s untuned intake which by most theoretical analysis should not work all that well actually does a very good job of making good average numbers over a wide rpm range and in a wide range of applications.

I looked at the b-body ET page and of the fastest few built motor NA cars the fastest is a LSX based 454 with a 256/260 cam at 11.09, next is a severly lightened 383 LT1 with a LT4 headsported of course and 236/244SR at 11.1, then a LT1 391 AFR LT4s secret solid roller at 11.2. The LSX car was run in warm weather so ther is more left in it, but still that is a lot of extra cubes and a lot more cam to get the performance advantage he has. Imagine if some of these guys swapped to top of the line gen1 heads or the SB2.2s. I would think that fair seeing as the LSX motor is based on a C5R race block in order to get those cubes it also had 6.0L heads so they weren't the regular LS1 heads they did flow 340 though wow.

 

DO you mean 450 RWHP? Or flywheel HP? I need to know what you base that assumtion on? If you build a 383/396 like it SHOULD be built I see no problem as a daily driver.

A 450 rwhp six speed car will act much differently than a 450rwhp auto car.

SilverZZ28 on this board was close to that number with an auto and drove it everywhere.

Cam/head/intake selection has the biggest influence on driving manners.

I am gonna street drive my car when it is done, not daily(I have another ride) But it is truly on the ragged edge of a pumpgas driver. And it should(read hope) put out considerably more than 450rwhp all motor with an auto.

Most who build LT1's are on a budget, when an LS1 starts out of the gate with 50 CFM more headflow, LT1 guys have to spend thousands to reach headflow numbers that come stock on a LS1. But the guys who go full tilt have no problem matching power number cube for cube with an LS1.


David

 

How high are the high HP LS1 guys reving? Most of us in LTX land are staying below 7000rpms due to the pcm revs mean HP but not necessarily speed.
Furd made a wonderful example of this in the Merauder they were openly and directly marketting to the 94-96 Impala owners the Merauder was a 300hp/303tq DOHC 4.6L the Impala was a 260hp/330tq 5.7L LT1 similarly sized cars because the Merauder was based on the Crown Vic chassis stock for stock they are roughly the same as far as track times and boltons get you a whole lot more with the Impala because it is not as optomized in stock form. HP is only a part of the story great for bragging rights though.

 

Don't you mean it made 457 rwhp? I have never heard of any LT1 making over 500 rwhp with a cc306 and stock head castings.