Dyno Results

[v6maro]

<blockquote>quote:</font><hr>Originally posted by Speed:
7psi isn't 7psi on any engine. I made 462 horsepower 473ft/lbs of torque with my LT1 prototype early in the build phase on 7psi and stock injectors. At 10psi it made 484/540 but I had to abort the dyno pull at 4700 rpm because the boost spiked to 10psi and I didn't want to push it. Good thing I didn't. I've sinse upgraded the injectors and run 12psi. I haven't dynoed it yet but it's enough to push my 3900lbs car to 128mph bouncing the rev limiter before the end of the track in 4th (6 speed car). I'm expecting 550/600 to the ground and times of around 10.7 @ 130 when it's done. Stock LT1 engine aside from injectors. No programming.

At 7psi, Radcats car made 282/320 if I recall.

Boost can be thought of as a measure of airflow on a given engine but it's not applicable from one engine to another. Even a cam change causes the S/C guys to get lower boost out of there poweradder because it's giving it a chance to push more air into the engine thus having less pressure in the intake manifold. You increase the volumetric efficiency thus you move more air through the engine. This is where the supercharger falls off because their compressors move a given amount of air based on engine rpm. Engine RPM dictates compressor RPM on a supercharger where as it's independant on a turbocharger.

[ June 04, 2003: Message edited by: Speed ]<hr></blockquote>

sorry, i phrased that wrong, on the exact same engine, if i took a 7psi turbo and a 7psi sc, and lets theoretically say they both produced exactly that amount of boost, wouldnt that same engine, within the same spec of air temp ect, produce the exact same peak numbers?
-Steve

[Tiago]

<blockquote>quote:</font><hr>Originally posted by v6maro:


sorry, i phrased that wrong, on the exact same engine, if i took a 7psi turbo and a 7psi sc, and lets theoretically say they both produced exactly that amount of boost, wouldnt that same engine, within the same spec of air temp ect, produce the exact same peak numbers?
-Steve<hr></blockquote>


uhhh, HELL NO.
[img]tongue.gif[/img]

[v6maro]

<blockquote>quote:</font><hr>Originally posted by Tiago:



uhhh, HELL NO.
[img]tongue.gif[/img] <hr></blockquote>

prove it.

[xjarayax]

Compare the numbers, it's already been proven.

[v6maro]

different cars, different mods, sorry, doesn't prove sh!t.

[mattsv6]

why are you wasting your time posting nonsense?

[Speed]

<blockquote>quote:</font><hr>Originally posted by v6maro:


sorry, i phrased that wrong, on the exact same engine, if i took a 7psi turbo and a 7psi sc, and lets theoretically say they both produced exactly that amount of boost, wouldnt that same engine, within the same spec of air temp ect, produce the exact same peak numbers?
-Steve<hr></blockquote>

Well, not exactly. Let assume that you took the exact same compressor pushing the air through the same path, though the same intercooler, the SC would still dyno lower because of the belt drag. Some will argue that the turbocharger back pressure causes a loss in horsepower, but that is true only under certain conditions. At other times, the turbine helps pull the exhaust out of the cylinder (ie between shifts when the turbine is spinning faster than the exhaust flow). Energy in the exhaust in the form of heat and movement are what drives the turbocharger. Even under the worst of conditions the back pressure is not enough to cause even a 1/4 of the horsepower loss that the belt pulls of the crank. I have started the design phase of for converting an 03 Cobra form supercharged to turbocharged and we estimated that when overdriven by a small pully, the blower requires almost 100 horsepower to drive it.

In anycase, that is why turbo cars always seem to dyno higher.

[nocutt]

<blockquote>quote:</font><hr>Originally posted by Speed:


Well, not exactly. Let assume that you took the exact same compressor pushing the air through the same path, though the same intercooler, the SC would still dyno lower because of the belt drag. Some will argue that the turbocharger back pressure causes a loss in horsepower, but that is true only under certain conditions. At other times, the turbine helps pull the exhaust out of the cylinder (ie between shifts when the turbine is spinning faster than the exhaust flow). Energy in the exhaust in the form of heat and movement are what drives the turbocharger. Even under the worst of conditions the back pressure is not enough to cause even a 1/4 of the horsepower loss that the belt pulls of the crank. I have started the design phase of for converting an 03 Cobra form supercharged to turbocharged and we estimated that when overdriven by a small pully, the blower requires almost 100 horsepower to drive it.

In anycase, that is why turbo cars always seem to dyno higher.<hr></blockquote>


I concor! The engine doesn't care about psi...people put the numerical value to boost. CFM is the single most important thing here..in regards to boost! Even if you matched the compressor (both turbo and SC) the SC is basically stuck to its own parameter...it cannot defy its character nor can it defy physics...it is RPM dependent and robs power from the crank (a centrifugal SC can come close to getting a turbos oh so wonderful exponential progression of making power across the RPM band, still the unit only makes power from its attachement to the recepient engine)...even if one was to exclude the fact that the SC robbed power, it cannot have the same peak power as a turbo. Even if all the variable were the same...

[hawgs]

OWN3D

[Takumi Fujiwara]

http://www.newcomicreviews.com/board...ndmaVsBaby.gif

I think that owned is more fitting to the situation

[Tiago]

LMFAO! :D [img]graemlins/rofl.gif[/img]

[Takumi Fujiwara]

Yeah I mainly put it up for u, so im glad u enjoyed it =) But I more think of it as how much more the turbo kit owns the sc =)

[Dirty8-un-Dreds]

Oh well now im torn, always wanted the SC but in my eyes I am seeing too good a thing from this turbo kit. When you figure it out please by all means post the price so I ca start saving for either hehe. But needless to say impressed [img]graemlins/thumbsup.gif[/img]

[Swift_3800_F-Body]

the numbers are impressive indeed, the car will keep up with stock LS1's and lightly modded LT1's

higher boost, ported heads, and the right cam will make your dyno charts look quite lovely

what do you guys expect from a stock 3800 v6 engine?

you wont get LS1 Turbo numbers with low boost, if thats what you guys are looking for you need to do alot of work and lots more boost.

if you notice the LS1 is very restriced stock, and the engine is manufactured to be air hungry, i find it impressive that an engine so restricted makes so much power, small mods to increase air flow show on the dyno and make noticeable gains. thats why bigger modifications like bigger heads, bigger intake, bigger throttle body and a cam make such a huge difference on the LS1, turbocharging the LS1 with 7-9 psi makes power gains almost up to 450-500 rear wheel horse power, now thats a dyno sheet to frame and hang on your wall. [img]smile.gif[/img]

[twofaced]

OK I am not bashing, cause personally I love the idea of turbos or superchargers, only wish I could afford one right now. But from a realistic stand point, Why dyno a car when its cold? I mean, under normal conditions, say out and about and decide to race, or even more, sitting in the staging lanes for 15-20 minutes at the track. Are we going to stop and say wait, can my car cool down first, I want the most umph I can get. I dont think so. Anyways, thats only my $0.02. I am glad someone has undertaken the task of creating this system for us, and I thank you for your time and effort. Those are great numbers by the way, and I hope you break the 315/350 goal. Is there financing available on the project yet, LOL?