LS1 Motorsports Single Turbo Update: DYNO GRAPHS!
Thread Starter
Joined: Nov 2001
Posts: 10,018
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From: Virginia
LS1 Motorsports Single Turbo Update: DYNO GRAPHS! Straight From the fires of Mount DOOM!
7psi, pump gas, stock valvesprings(gave out)
http://www.ls1motorsports.com/images/498HPDyno.jpg
9psi, 50/50 race gas mix, new SLP springs
http://www.ls1motorsports.com/images/534HPDyno.jpg
The full page: http://www.ls1motorsports.com/Single_Turbo.htm
7psi, pump gas, stock valvesprings(gave out)
http://www.ls1motorsports.com/images/498HPDyno.jpg
9psi, 50/50 race gas mix, new SLP springs
http://www.ls1motorsports.com/images/534HPDyno.jpg
The full page: http://www.ls1motorsports.com/Single_Turbo.htm
TECH Resident
iTrader: (3)
Joined: Nov 2001
Posts: 979
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From: Richmond, VA Where fast cars, well......are hard to come by.
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! Talk about an ***-load of torque. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> I'm gonna need to run like 20psi to keep up with your 13 or whatever you decide on. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
On The Tree
Joined: Nov 2001
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From: Charlestown, Indiana
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by smokinHawk:
<strong> Did shawn have a ls6 intake on his car?
got to love that torque! </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Smokinhawk, you're slipping on me....Of course he had an LS6 intake...they came stock on '01-02 models. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
<strong> Did shawn have a ls6 intake on his car?
got to love that torque! </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Smokinhawk, you're slipping on me....Of course he had an LS6 intake...they came stock on '01-02 models. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
On The Tree
Joined: Nov 2001
Posts: 1,100
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From: Charlestown, Indiana
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by FASST:
<strong> forged internals I assume? Stock cubes? Nice numbers. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No, completely STOCK engine and drivetrain. The only thing not stock (besides our turbo kit), was the fact that he was running open exhaust.
<strong> forged internals I assume? Stock cubes? Nice numbers. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No, completely STOCK engine and drivetrain. The only thing not stock (besides our turbo kit), was the fact that he was running open exhaust.
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Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Rob Raymer:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by smokinHawk:
<strong> Did shawn have a ls6 intake on his car?
got to love that torque! </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">smokinhawk, you're slipping on me....Of course he had an LS6 intake...they came stock on '01-02 models. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">ah didnt notice the year.
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by smokinHawk:
<strong> Did shawn have a ls6 intake on his car?
got to love that torque! </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">smokinhawk, you're slipping on me....Of course he had an LS6 intake...they came stock on '01-02 models. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">ah didnt notice the year.
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Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! I was wondering the same thing? Are you sure it isn't a fuel supply issue Rob? That hp curve sure does nosedive on the top. Did you monitor for knock and a/f?
On The Tree
Joined: Nov 2001
Posts: 1,100
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From: Charlestown, Indiana
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! His car still had the stock fuel pump at the time also. We were waiting on the release of the Racetronix pumps for the "plastic tank" F-Bodies, but they weren't finished yet.
We ended up shipping his sending unit to ARE to gave them custom modify it with a Walbro 340. At the same time, Shawn changed valve springs and pushrods as a precautionary measure.
Since it still had the stock pump and valve springs, I never planned on pulling past 5500 anyway. I was actually off the throttle (but still in gear) at the point the graph starts to drop off. We were doing a "coast down" to check for drivetrain balance issues.
Hope that helps.
We ended up shipping his sending unit to ARE to gave them custom modify it with a Walbro 340. At the same time, Shawn changed valve springs and pushrods as a precautionary measure.
Since it still had the stock pump and valve springs, I never planned on pulling past 5500 anyway. I was actually off the throttle (but still in gear) at the point the graph starts to drop off. We were doing a "coast down" to check for drivetrain balance issues.
Hope that helps.
TECH Resident
Joined: Nov 2001
Posts: 808
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From: Richmond,Va
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! thats freakin crazy <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> i'm gonna be the slow guy in richmond its lookin like <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" />
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! I take it this is a 6-speed car?
When are you planning to run it to 6000? I'd REALLY like to see the dynograph on it.
Keep us posted.
When are you planning to run it to 6000? I'd REALLY like to see the dynograph on it.
Keep us posted.
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MIGHTYMOUSE:
<strong> Straight From the fires of Mount DOOM!
7psi, pump gas, stock valvesprings(gave out)
http://www.ls1motorsports.com/images/498HPDyno.jpg
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Why would stock valvesprings give out? Very strange. When you say gave out....do you mean they floated? They broke?
<strong> Straight From the fires of Mount DOOM!
7psi, pump gas, stock valvesprings(gave out)
http://www.ls1motorsports.com/images/498HPDyno.jpg
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Why would stock valvesprings give out? Very strange. When you say gave out....do you mean they floated? They broke?
Thread Starter
Joined: Nov 2001
Posts: 10,018
Likes: 51
From: Virginia
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! the sketchyness of the first graph is probably a combination of the valves floating a little and the leaning of the ratio together..
the more boost you run, the lower your valve seat pressure gets.. check the geometry
say a 2" valve, thats area=pi*rad^2 = 3.14"^2
3.14"^2 * 7psi = 21.98 pounds of seat pressure removed from the spring, for a stock spring thats like a 25% drop in seat pressure. so stiffer springs are needed to hold on to the cam.
this is right.. right?
the more boost you run, the lower your valve seat pressure gets.. check the geometry
say a 2" valve, thats area=pi*rad^2 = 3.14"^2
3.14"^2 * 7psi = 21.98 pounds of seat pressure removed from the spring, for a stock spring thats like a 25% drop in seat pressure. so stiffer springs are needed to hold on to the cam.
this is right.. right?
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! yep.... that's right.... also the same principle applies to the exhaust valve... although smaller in rad, it can sometimes see up to 30psi of back pressure.
So you can see where weak springs just can't keep up with following the cam with all the extra force that boost/backpressure causes, pushing against them.
So you can see where weak springs just can't keep up with following the cam with all the extra force that boost/backpressure causes, pushing against them.
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! Rob....... seriously... u DA man!!
awesome numbers.... so i just sold my turbo kit, i am thinking it's about time for me to send you a deposit.... <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
awesome numbers.... so i just sold my turbo kit, i am thinking it's about time for me to send you a deposit.... <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! I am new to the turbo seen so bare with me on this. Why did it fall off so hard and so fast? I know it made good power down low but from 4,000 it lost 100hp and 250 ft/lbs. Why is that?
Re: LS1 Motorsports Single Turbo Update: DYNO GRAPHS! Just so everyone is clear here. The valves (once open) has pressure on the backside of the valve where the stem attaches.
This pressure become really important as the valve spring attempts to seat the valve closed. With enough pressure it can overcome the total force of the spring attempting to close the valve.
Honestly I never thought about that dynamic before. Since I have aftermarket springs I never ran into it. But it definitely makes sense.
This pressure become really important as the valve spring attempts to seat the valve closed. With enough pressure it can overcome the total force of the spring attempting to close the valve.
Honestly I never thought about that dynamic before. Since I have aftermarket springs I never ran into it. But it definitely makes sense.