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Forced Induction Superchargers | Turbochargers | Intercoolers

does this look like its out of turbo?

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Old Jun 25, 2006 | 12:30 PM
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Default does this look like its out of turbo?
Should have made more power @ 7.5psi. 9:1, 226/220 115 cam, fmic, 347, injectors, pump, fresh A4 with a small stall, STS with 60-1 .81.
Power went up fast, but then the climb slowed, but still peaked at 6500
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Old Jun 25, 2006 | 12:35 PM
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Never had a rear mount setup on an LS1, but I did have both a T72 and T76 GTS on a 346CI LS1. The T72 was marginal. The T76GTS was perfect. Made 750rwhp at 14psi with it. At the same boost level, the T72 made 580rwh and IAT's were hotter. Despite going to a bigger turbo and larger A/R, spool wasn't negatively impacted.
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Old Jun 25, 2006 | 12:37 PM
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That is a really strange graph. Real progressive climb, and the output is nowhere near where it should be... Torque is up there, horsepower isn't...
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Old Jun 25, 2006 | 12:57 PM
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You gotta love how flat it is, but I was expecting around 480 through the a4.
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Old Jun 25, 2006 | 12:59 PM
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yeah I would guess upper 4s..why only 7.5 pounds of boost if the motor is 9.1comp?
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Old Jun 25, 2006 | 01:00 PM
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Originally Posted by Earl H
Never had a rear mount setup on an LS1, but I did have both a T72 and T76 GTS on a 346CI LS1. The T72 was marginal. The T76GTS was perfect. Made 750rwhp at 14psi with it. At the same boost level, the T72 made 580rwh and IAT's were hotter. Despite going to a bigger turbo and larger A/R, spool wasn't negatively impacted.
I believe your signature pictures are way way too big
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Old Jun 25, 2006 | 01:08 PM
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Originally Posted by SuperZ
yeah I would guess upper 4s..why only 7.5 pounds of boost if the motor is 9.1comp?
To be honest, the guy doesnt go to the track, wont race, and almost never even gets on it. I would love to do 10 or 12psi, but the customer is conservative. He is coming back for wheels and tires and I will try and get him to let us do a little more.
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Old Jun 25, 2006 | 02:20 PM
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Yea Billy... To get him at the optimum curve with his CR I think you need to be up at 10-12 PSI and tune for that.... He dosent need to put his foot in it... but it should be tuned for it.
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Old Jun 25, 2006 | 08:00 PM
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Originally Posted by Boostaholic
I believe your signature pictures are way way too big
How do I resize them? I've been wanting to shrink them a bit.
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Old Jun 25, 2006 | 10:18 PM
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Originally Posted by Earl H
How do I resize them? I've been wanting to shrink them a bit.
Hmm you need something like photoshop or gimp, it would look pretty sweet if you made a side by side banner 150px tall which is what I believe the limit is on height
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Old Jun 25, 2006 | 10:25 PM
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Lock the converter and plot it against RPM instead of speed and you will get a much better idea of what's going on.
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