I know some of these are general knowlege, but its 11PM, im too tired to go looking tonight. I've punched in some guesswork and got an interesting graph, looks just like my mine up until my power loss at 5800, just a little higher. But I havent punched in the -10 int and +4 exaust yet, im curious what that does to it. But I wanna get this as accurate as possible to acccurately portray what the cam timing does, so if anyone can provide any numbers or files that would be awsome. Also suggest anything you'd like to see plotted.
I think it would be awesome to include the full cam specs... at least the ones we know, for the '96 LQ1. Here they are, I pulled them from 60degreev6.com:
seat to seat specs
Intake lift .369". 221.8. 110 centerline. IVO .9 IVC 40.9 EVO 43.1 EVC 3.1
Sometimes I wonder how difficult it would be to get all the information on the LQ1 from the source at GM. If I even knew where to start, I'd be all over that problem. It isn't as if I have much else to occupy myself with until I find another job.
I'd bet it would be easier than all the effort people have made to spec the engines out on their own. If only...
[This message has been edited by Fiero Brick (edited 02-13-2006).]
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12:19 AM
86GT3.4DOHC Member
Posts: 10007 From: Marion Ohio Registered: Apr 2004
Sometimes I wonder how difficult it would be to get all the information on the LQ1 from the source at GM. If I even knew where to start, I'd be all over that problem. It isn't as if I have much else to occupy myself with until I find another job.
I'd bet it would be easier than all the effort people have made to spec the engines out on their own. If only...
The cam numbers are from 96-7's and the headflow numbers are from 91-5's. Heads were different in 96-7. Some say the cams are smaller in 96-7 compared to the 91-5's but it hasn't been proven yet. They're going to have the 91-5 cams speced the same as the 96-7's were done over at 60degree so everyone knows once and for all though. I'm not sure if anyone's tested 96-7 head flow yet but there's a lot of opinions abut that too floating around.
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01:25 AM
86GT3.4DOHC Member
Posts: 10007 From: Marion Ohio Registered: Apr 2004
Actualy dropping off the forced induction it is VERY realistic. So that leaves us with the induction section that needs filled in. Its really late, so I might be missing something but looking at it, thats about right from my ECM logging program that has a simu-dyno. Granted its probably not perfectly accurate, but it looks to be moving allong the same lines until I hit my dead spot and drop power after 5800. Ive tested between 280 and 320 MP max depending on which run (and im guessing which way into the wind or hill I was pointing at the time) so I think my DD numbers are about right. Big thanks to Fiero Brick and Fieromadman for thier numbers. Graned im running a 92, and brick's numbers were 96-97 but at least its closer than the super generic numbers that come with the DD program. +'s for you guys. Still would appreciate more numbers to tweak with. Specificaly on the induction section. The low torque still seems a little high, around 235. and HP is about 210.
Now the kicker, all this work to see what the cam timing will do to it, and it will not let me set IVO to a - BTDC which is where im sitting with my 10* intake retard/4* exh adv. GREAT, ugh. it does however show a neat depiction of the 13* retard with NA.
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01:28 AM
Steven Snyder Member
Posts: 3326 From: Los Angeles, CA Registered: Mar 2004
Let's not forget that the early upper intake manifold was built more for low end and midrange, too. Whee... the LQ1's almost *more* fun because there are so many things we still don't know about it.
Thanks but unfortunately I cannot set the cams to the settings I have in my car, so I kinda lost intrest. I was trying to track down the source of my nasty power drop off around 5800-6300, thought maybe the software would give me a hint as to what the cam timing did to it. Its probably in the exaust anyway ,either the turbine is too small, or maybe this nasty little bend I have here. Please disregard the welds, I wanted them to be as strong as humanly possible so I made them real heavy, as the pipe supports most of the muffler and tip weight. You will even see reinforcing metal I welded onto the turbine flange
Well... I only have knowledge of this kind of thing on paper, I haven't actually gotten my hands dirty with it, but from what I've observed in books and online all over the place, I'd try bumping up the size of the exhaust a bit. I don't think the 2.5" (isn't that what you said it was elsewhere?) pipe can handle that volume of exhaust.
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02:51 AM
86GT3.4DOHC Member
Posts: 10007 From: Marion Ohio Registered: Apr 2004
DID YOU LOOK AT THE PICTURE!?!? lol I woulda went a little bigger, but damn, I barely got that in there.
I'll probably drop the back of the cradle and rework the exaust some weekend coming up. It was a real B* to get that squiggly little pipe bent up right at that size, but even installing it I was afraid I would have trouble. I want to pull the turbo back system off and run it down the road with the data logger and see what it does, but im hesistant about running WOT without an O2 sensor.
I was wondering if anyone knows how accurate desktop dyno really is? I've used it on my SBC build and if its accurate i'm gonna be a very happy camper . Those are some pretty impressive #'s man keep up the good work !
------------------ HARDCORE SBC CRONIE AND PROUD OF IT ! GOT TQ ?
. Those are some pretty impressive #'s man keep up the good work !
