Built LT1

iTrader: (3)

In this month's issue of Hot Rod, a '94 Z28 runs 9's @135 with an N/A LT1 and a stock computer! No I did not type in error. Let's forget for a moment that its a LT1(which is insane considering is sucks compared to an LS1), have any of you heard of someone running this kind of time with only 456 rear wheel horse? WTF!

cws T/A

iTrader: (3)

Ill have to check that out

camaroextra

iTrader: (10)

if they did massive weight reduction.

blkZ28spt

I wouldn't go so far as to say the LT1 sucks compared to the LS1. The LS1 is just one rung higher on the ladder, and an LT1 can still make plenty of power.

Need more info.

If it was a heavily modded, stripped down race car making 456 rwhp through a 5,000 stall speed converter, for example, it's hardly news worthy to me.

Built LT1

iTrader: (3)

If I remember correctly, I think they dropped the weight by 500 pounds. But even so, 9's @135?

qwikz28

iTrader: (12)

with a really low 60' i dont see why not

Built LT1

iTrader: (3)

I always thought that trap speed was an indication of horsepower and that it (trap speed) is not affected whether you hook or spin off the line. I trap about 125 with over 500 rear wheel horse. I don't think my speed would go up if I got better traction.

blkZ28spt

Actually it would, if anything, probably go down. ET goes down but so does MPH. After all, you are accelerating for a shorter period of time, right?

Removing weight will add to mph. 500 pounds, all else equal, using the old rule of thumb, will add ~ 5mph.




I am curious to see this article.

Built LT1

iTrader: (3)

Taking that into account, the math does not add up.

He is 456 horse less 500 pounds (5 mph); 9.93 @135 with a1.28 60 foot
I have over 500 rear wheel full weight; 11.34 @124.XX with a 1.9 60 foot.

By the above logic you mentioned, I should be going faster.

blkZ28spt

Unfortunately there are many other variables to take into account. Based just on that...

Different cars run differently.
Different drivers run differently.
You are only looking at peak horsepower numbers.
We do not actually know the precise raceweight of either car, just guestimates.
We do not know what the DA was for the runs.

Built LT1

iTrader: (3)

I just learned that the driver and owner of that car is on this forum. I'll have to send him a PM. I am obviously doing something wrong.

Built LT1

iTrader: (3)

Hardly news worthy? This guy is supposedly the world's quickest and fastest LT1 N/A with a stock pcm. Like the title of this thread asks, I still don't know of ANYONE doing this kind of performance based on 456 horsepower...not even an LS1. It's a headline that is very newsworthy in my view.

distortion_69

iTrader: (20)

He's coming out of the hole a ton faster than you, therefor at the 60' he's going faster than you (i'd say over 60mph at the 60').. He can be more efficient at getting his power to the ground, and the same power can still give him high traps. The gain between 1/8th and 1/4 will tell the tale in a situation like that on how much raw power the car has. Being as light as he is, and how fast he is going straight from the get go, it's not gonna be that hard to see how he's doing 13x mph with 450rwhp. Plus, you have to consider this.. 450rwhp on his dyno, might be 480rwhp-500rwhp on somebody elses.

blkZ28spt

I had no idea the stock PCM was extremely significant. This is, after all, LS1 tech.

All I 'saw' was an LT1 with drastic weight reduction, serious drag strip oriented modifications and a ***** out race only engine revving it's heart out running 9's.....am I wrong?

Built LT1

iTrader: (3)

That makes sense to me. I can only wonder what a significant change to my 60 foot time would yield on the big end. But like BLKZ28 posted, I have heard that lower sixty foots will lower your trap. I am bit confused.

distortion_69

iTrader: (20)

Added in another little section. The times are a little different, but theres just too many variables. We don't know his exact weight.. for all we know he could be spraying and you mis-read.. i'll try to research it.

Peace,
Josh

Built LT1

iTrader: (3)

Thanks, keep us apprised. He may have been spraying. But until we know for sure, we should give him the benefit of the doubt and recognize his accomplishment.

Project GatTagO

iTrader: (7)

465 HP at the rear wheels is about 580 HP at the flywheel if you take into account about a 20% loss. The 20% loss is certainly a good number given a high stall automatic trans. So if you plug 580HP into a drag racing calculator with a race weight of 3100 pounds, you get a theoretical time of:

9.89@133.9 MPH

Where is the mystery?

My best pass with my LS1 RX7 is 11.21 @ 121 MPH. The car is right at 3100 pounds with driver and makes about 365 RWHP. If you plug the weight and HP (430 at the crank with a 15% loss since I have a 6 spd) into the same drag racing calculator, you get a theoretical run of 10.81 @ 121 MPH.

No mystery there either. I have a relatively soft 1.6 60' time and I have to shift.

Andrew

brad8266

iTrader: (23)

Damn I need to do some weight reduction soon.

qwikz28

iTrader: (12)