LT4 real horsepower?
12-10-2015, 09:43 PM
#21
lol... k.. years ago you would have been laughed off the forums for referencing magazing times as being anything significant, but since hardly anyone races anymore that's all you have... Magzines use correction factors for their times, they do not run on a prepped track, and there were piles of complaints years ago that they didn't know how to drive. Some of those magazines were also claimming the 96 SS when low 13's at 108 to mid 13's at 106 to high 13's at 102.
At least the magazines are supposed to be fair and objective in their testing. I'm familiar with that "corrected" C&D "106" MPH 1996 SS road test...the WS6 Formula in the comparison was a turd with a bad optispark or some **** in that test.
http://www.caranddriver.com/comparis...omparison-test
In reality, the SS ran 13.8 @102MPH with the firehawk 14.3 @ 98 MPH if you look closely at the drag strip results and not the "standard" C/D testing procedures:http://media.caranddriver.com/files/...s-dec-1995.pdf
12-10-2015, 11:38 PM
#22
Village Troll 
iTrader: (2)
c&d actually are the closest ones with a13.6 @ 102 for the 96 SS. It was a couple of the others that had whacked out numbers. As far as the vette is concerned, you are wrong. it was stock. i knew the car well. i don't remember what time of year it was, but it was a texas motorplex/ennis, which is about 400 or so ft. elevation.
12-10-2015, 11:42 PM
#23
Ss rrr I agree I should be running 13.9's with my 101 trap. With my new bilstein shocks, LCA's, and panhardbar I have no wheel hop, and it hooks better and pulls straight. Before it was hopping, not tracking straight, and blowing the tires off in 2nd gear. 13.9 cap for sure now. Mac mids, catless y pipe, and bullet muffler going on before next run in april. Also a meziere hd ewp, 160 stat, and solomon tune is getting done. I would think I should at least get a 13.6 with these mods. Maybe LE next winter then it will go from play power to serious power. Im at 800ft elevation. I'll post video of the white turd when I run it. Maybe it will approach lt4 power. I was thinking maybe springs and rr's but I just can't afford them this winter wah wahh!
12-23-2015, 02:56 PM
#26
They typically dyno around 305-310 at the wheel. Biggest one on the registry is 320/319. Lowest is 300/301. Read the GS registry, there are stock examples posted:
http://grandsportregistry.com/dyno.htm
That would put them roughly 350-360 at the flywheel. Or about 15-16% more than an LT1 with 300 flywheel. Seems like the mods add up.
12-23-2015, 07:26 PM
#28
Every single thing you just listed is negligible by itself, but you want to argue the point. A compression increase of .4 by itself wouldn't even get 5hp. You think a roller timing chain picks up hp over a light nylon geared chain? That's news to me. Blah blah blah. All of that stuff together might get you 5-10hp. You just have an incredible hatred towards the LT4 engine, not to mention other things. You pop in every single one of these threads, like clockwork.
12-23-2015, 09:33 PM
#29
How about the 800rpm? 300hp at 5000rpm means the LT1 is making 315tq at that point, guess how many HP 315tq is at 5800rpm. GM specs also have the LT4 making the same peak TQ BUT needing 500rpm more to get there.
To those who care to understand anything I make valid points. I am not saying the flow means nothing just that it doesn't pan out the way people believe.
I can't believe you are actually claiming roller rockers aren't worth anything.
Far as "like clockwork" you will BLINDLY argue anything I say.
Just the first article I found on how roller rockers are pointless.
http://www.hotrod.com/how-to/engine/...er-ratio-test/
GIZMO the Stock Eliminator racer who used to hang out here said LT4 heads were worth .1 in the 1/8th mile on his pure race car.
To those who care to understand anything I make valid points. I am not saying the flow means nothing just that it doesn't pan out the way people believe.
I can't believe you are actually claiming roller rockers aren't worth anything.
Far as "like clockwork" you will BLINDLY argue anything I say.
Just the first article I found on how roller rockers are pointless.
http://www.hotrod.com/how-to/engine/...er-ratio-test/
GIZMO the Stock Eliminator racer who used to hang out here said LT4 heads were worth .1 in the 1/8th mile on his pure race car.
Last edited by 96capricemgr; 12-23-2015 at 09:44 PM.
12-24-2015, 07:15 AM
#30
How about the 800rpm? 300hp at 5000rpm means the LT1 is making 315tq at that point, guess how many HP 315tq is at 5800rpm. GM specs also have the LT4 making the same peak TQ BUT needing 500rpm more to get there.
To those who care to understand anything I make valid points. I am not saying the flow means nothing just that it doesn't pan out the way people believe.
I can't believe you are actually claiming roller rockers aren't worth anything.
Far as "like clockwork" you will BLINDLY argue anything I say.
Just the first article I found on how roller rockers are pointless.
http://www.hotrod.com/how-to/engine/...er-ratio-test/
GIZMO the Stock Eliminator racer who used to hang out here said LT4 heads were worth .1 in the 1/8th mile on his pure race car.
To those who care to understand anything I make valid points. I am not saying the flow means nothing just that it doesn't pan out the way people believe.
I can't believe you are actually claiming roller rockers aren't worth anything.
Far as "like clockwork" you will BLINDLY argue anything I say.
Just the first article I found on how roller rockers are pointless.
http://www.hotrod.com/how-to/engine/...er-ratio-test/
GIZMO the Stock Eliminator racer who used to hang out here said LT4 heads were worth .1 in the 1/8th mile on his pure race car.
12-24-2015, 09:57 AM
#31
So a 6000rpm 400hp sbc is a whole different beast than a 350hp 6000rpm LT1?
You said
Even if you want to downplay the rocker thing and cut it in half, and use your "less than 5hp" for the compression and say 4hp then we are still at 10hp gained from those two meaningless things.
How about the rpm? I laid out that the LT4 makes the same torque just makes it later.
I also pointed out how a well setup racecar gains .1 from just those heads.
They do gain from stock LT1 BUT just not the 45hp you are claiming, or rather 35-40 since all those other changes only make up 5-10.
You said
All of that stuff together might get you 5-10hp.
How about the rpm? I laid out that the LT4 makes the same torque just makes it later.
I also pointed out how a well setup racecar gains .1 from just those heads.
They do gain from stock LT1 BUT just not the 45hp you are claiming, or rather 35-40 since all those other changes only make up 5-10.
12-24-2015, 01:39 PM
#32
11 Second Club
🔝🔝🔝🔝🔝🔝
12-24-2015, 08:15 PM
#34
Video is 100% fake according to D-money. No way in hell an LT4 powered Camaro could run a 13.2 bone-stock. They only have 330hp and are barely better than the almighty LT1. Those 30hp must be clydesdales.
12-24-2015, 10:43 PM
#35
TECH Addict
12-25-2015, 06:15 AM
#37
I never saw an LT4 car run good. Back at Memphis 97, Matt Murphy of SLP, brought a LT4 SS and it was a dog. 13.8-14.0@102-103, IIRC. Looked good and sounded good but just didn't get it down the track.
My 96 WS6 Formula ran 13.5@103 on a 2.0 bone stock at MIR. With just a K&N, 160 t-stat, and 4.10 gears, it ran a 13.18@104.9 on a 1.89. All on stock GSC's. Dyno showed 274/304 at the wheels at the time. I think I had 3K miles on it at the time.
My 96 WS6 Formula ran 13.5@103 on a 2.0 bone stock at MIR. With just a K&N, 160 t-stat, and 4.10 gears, it ran a 13.18@104.9 on a 1.89. All on stock GSC's. Dyno showed 274/304 at the wheels at the time. I think I had 3K miles on it at the time.
12-25-2015, 06:41 AM
#38
Well like joelster told us things like increased cam lift and overlap are meaningless, reducing friction is pointless too and compression increases are worth almost nothing.
On a more serious note, if you look at my posts you will see I laid out that the LT4 makes the same torque just later, the same 340ft.lbs peak just 500rpm later and at peak HP which occurs at 5000 for the LT1(300hp) and peak HP for the LT4 is 5800(GM claims 330 those here claim 345-350). If you calculate the LT1 TQ at peak HP it is 315ft.lbs if you run the math 315ft.lbs. at 5800rpm is 348hp. That kind of shift upward in rpm range is going to cam for a lot more aggressive launch to use.
Oh joelster and in the GSregistry page I see a couple in the 280s and NOBODY especially not a Vette owner is going to report a low number. It isn't like that list was grab 40 cars and dyno them, it is voluntary results from people who are proud of them. The fact a lot of lightly modded cars are in the 300-310 range says something, like something along the lines of it takes a few mods for them to get to that number.
On a more serious note, if you look at my posts you will see I laid out that the LT4 makes the same torque just later, the same 340ft.lbs peak just 500rpm later and at peak HP which occurs at 5000 for the LT1(300hp) and peak HP for the LT4 is 5800(GM claims 330 those here claim 345-350). If you calculate the LT1 TQ at peak HP it is 315ft.lbs if you run the math 315ft.lbs. at 5800rpm is 348hp. That kind of shift upward in rpm range is going to cam for a lot more aggressive launch to use.
Oh joelster and in the GSregistry page I see a couple in the 280s and NOBODY especially not a Vette owner is going to report a low number. It isn't like that list was grab 40 cars and dyno them, it is voluntary results from people who are proud of them. The fact a lot of lightly modded cars are in the 300-310 range says something, like something along the lines of it takes a few mods for them to get to that number.
12-26-2015, 09:32 AM
#40
Well like joelster told us things like increased cam lift and overlap are meaningless, reducing friction is pointless too and compression increases are worth almost nothing.
On a more serious note, if you look at my posts you will see I laid out that the LT4 makes the same torque just later, the same 340ft.lbs peak just 500rpm later and at peak HP which occurs at 5000 for the LT1(300hp) and peak HP for the LT4 is 5800(GM claims 330 those here claim 345-350). If you calculate the LT1 TQ at peak HP it is 315ft.lbs if you run the math 315ft.lbs. at 5800rpm is 348hp. That kind of shift upward in rpm range is going to cam for a lot more aggressive launch to use.
Oh joelster and in the GSregistry page I see a couple in the 280s and NOBODY especially not a Vette owner is going to report a low number. It isn't like that list was grab 40 cars and dyno them, it is voluntary results from people who are proud of them. The fact a lot of lightly modded cars are in the 300-310 range says something, like something along the lines of it takes a few mods for them to get to that number.
On a more serious note, if you look at my posts you will see I laid out that the LT4 makes the same torque just later, the same 340ft.lbs peak just 500rpm later and at peak HP which occurs at 5000 for the LT1(300hp) and peak HP for the LT4 is 5800(GM claims 330 those here claim 345-350). If you calculate the LT1 TQ at peak HP it is 315ft.lbs if you run the math 315ft.lbs. at 5800rpm is 348hp. That kind of shift upward in rpm range is going to cam for a lot more aggressive launch to use.
Oh joelster and in the GSregistry page I see a couple in the 280s and NOBODY especially not a Vette owner is going to report a low number. It isn't like that list was grab 40 cars and dyno them, it is voluntary results from people who are proud of them. The fact a lot of lightly modded cars are in the 300-310 range says something, like something along the lines of it takes a few mods for them to get to that number.
Just so you don't screw it up on your reply. Here's what I say.
1. The LT4 is better than the LT1 and 95% of the reason is the heads.
2. LT4 heads are much better than LT1 heads in stock form.
3. LT4 cars can routinely rip low 13's.
4. LT4 cars can put down 310hp at the wheels and make around 350-360 at the flywheel.