MY 04 GTO with a 76mm set up..
03-18-2007, 11:16 PM
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MY 04 GTO with a 76mm set up.. Just wanted to share a few pictures of my custom turbo set up.. 76mm .96 AR stock block LS1 in a 04 GTO
started with a 440/402 H/C combo TSP cnc'ed 243's, TSP .232/234 112
then added a 76 set up to it..
Here is the graph, we had to let off because it went leaner then what I wanted.. 12.5.. plus I was having a PCV issue (I didn’t change it from the stock set up like a dip ****)
http://www.purposebuilt.org/firstpull.jpg
started with a 440/402 H/C combo TSP cnc'ed 243's, TSP .232/234 112
then added a 76 set up to it..
Here is the graph, we had to let off because it went leaner then what I wanted.. 12.5.. plus I was having a PCV issue (I didn’t change it from the stock set up like a dip ****)
http://www.purposebuilt.org/firstpull.jpg
03-18-2007, 11:21 PM
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Originally Posted by 2002/Black/SS
stock block? really abusing it huh?
well I didn't think it would do that well on only 5-6psi and 19* of timing
but we're getting ready to do a forged short block
03-18-2007, 11:31 PM
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Originally Posted by ninetres
How many pounds of boost?
There is nooooooo way you are making 650 with only 5--6 psi on a 346.
There is nooooooo way you are making 650 with only 5--6 psi on a 346.
called JGS and asked what the stock spring was, I was told 6-8 so I'm still at a loss..
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03-19-2007, 01:09 AM
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Originally Posted by perdieu
trust me thats been beat to death on the GTO site too. All I know is it logged 137kPa on the boost controller EVC V and three people watching the gauge in the car said it hit 6 then leveled off at 5.. I'm still lost on it too..
called JGS and asked what the stock spring was, I was told 6-8 so I'm still at a loss..
called JGS and asked what the stock spring was, I was told 6-8 so I'm still at a loss..
03-19-2007, 07:10 AM
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Originally Posted by ninetres
137kpa equals 19.8 psi. Soooooooo..........?????????
139kPa (kilopascals) is 20.16 psi, which should be absolute manifold pressure. Boost would be 20.2-14.7, which is 5.5 psi gauge manifold pressure.
If the car made 440 at the wheels before the turbo, there's no reason it would not make 600+ on 5.5 psi. If the cam has alot of overlap it will give a low boost reading, but still flow a whole lot of air mass.
If the car made 440 at the wheels before the turbo, there's no reason it would not make 600+ on 5.5 psi. If the cam has alot of overlap it will give a low boost reading, but still flow a whole lot of air mass.
I'm not here to argrue what it did or how It did it. I was just posting up some pics for others to see.. Myself and the other 20 people at the dyno are still trying to figure out HOW it put the numbers down it did.. I was hopping to do that on 8psi with only 12* of timing..
Last edited by perdieu; 03-19-2007 at 07:28 AM.
03-19-2007, 07:56 AM
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Originally Posted by RealQuick
19.7 gauge pressure - 14.5psi atmospheric = 5.2psi boost
03-19-2007, 08:21 AM
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Originally Posted by ZL1Killa
well i was about to find this out...but yeh... cuz that didn't sound right up there. i will get my spreadsheet and see kPa's and boost later today and post it up
03-19-2007, 12:12 PM
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Not an expert here but I like to read a lot...
He's starting with a great flowing 440HP H/C combo. A turbo giving 14.7psi should double the horsepower. For 5.5psi you should see about 5.5/14.7 = 37% increase in power.
440 * 1.37 = 602HP
Great set up btw
He's starting with a great flowing 440HP H/C combo. A turbo giving 14.7psi should double the horsepower. For 5.5psi you should see about 5.5/14.7 = 37% increase in power.
440 * 1.37 = 602HP
Great set up btw
03-19-2007, 12:48 PM
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Originally Posted by Zombie
Never trust dyno numbers, gotta know what the MPH is at the track to gage HP more accurately. Dynos lie lie lie.
it went 11.75 at 119 N/A with a 1.60 at 4040
all I'm wanting now is 10.8's at 130 with 60' in the the 1.70's (soft launch) BTW it tips the scales at 4319 now with driver (265)
03-19-2007, 12:59 PM
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Originally Posted by perdieu
it went 11.75 at 119 N/A with a 1.60 at 4040
all I'm wanting now is 10.8's at 130 with 60' in the the 1.70's (soft launch) BTW it tips the scales at 4319 now with driver (265)
all I'm wanting now is 10.8's at 130 with 60' in the the 1.70's (soft launch) BTW it tips the scales at 4319 now with driver (265)
11.75 @ 119 is no joke at 4000+lbs and very impressive. If you trap 130ish then you can probably belive the dyno numbers. I've just personally seen too many impressive dyno numbers equate to poor MPH at the track (including my own when I was 6spd).
FWIW i've witnessed a 6spd SC'd (8psi) GTO lay down 500 RWHP on a mustang dyno and his best trap was 119.
03-19-2007, 02:26 PM
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Originally Posted by Zombie
Woah, did you add some lead to it? 4319 is like racing sherman tank or something.
11.75 @ 119 is no joke at 4000+lbs and very impressive. If you trap 130ish then you can probably belive the dyno numbers. I've just personally seen too many impressive dyno numbers equate to poor MPH at the track (including my own when I was 6spd).
FWIW i've witnessed a 6spd SC'd (8psi) GTO lay down 500 RWHP on a mustang dyno and his best trap was 119.
11.75 @ 119 is no joke at 4000+lbs and very impressive. If you trap 130ish then you can probably belive the dyno numbers. I've just personally seen too many impressive dyno numbers equate to poor MPH at the track (including my own when I was 6spd).
FWIW i've witnessed a 6spd SC'd (8psi) GTO lay down 500 RWHP on a mustang dyno and his best trap was 119.
Also you'll crap when I tell you I have all light weight flywheel and pressure plate stuff..19lb less then stock.. best 60’ is 1.55 on BFG DR’s
the 11.75 was on the 440 numbers so it was close
03-19-2007, 10:59 PM
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Originally Posted by perdieu
Please, I would like to have a copy of that too
14.7psia = 101.325 kPa
so for every 6.89469 kPa above 101.325 you are, that is your amount of boost
142.69 kPa is 6lbs of boost
i'm going to attach a purty excel sheet for this.
