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| Weavsvet | Re: I need more air........... | ||
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Senior Guru
 
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That might have been it Dan. I went for a rid and when I got back it wasn't nearly as bad. Dyno in the morning so I'll be able to see if this did any good. If I can go by the sound maybe it did. |
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Posted on: 2010/7/2 20:47
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1996 Corvette Coupe,AFR 195 street Eliminators,Edelbrock LT4 Air Gap intake manifold,9.5" 2800 stall,TPIS LT headers,Bullet 226/230.565.565/111 lsa cam,1.7 Scorpion rr's,EWP, X Pipe, Stock Exhaust,Elec.Cutouts,Dana 44/3.45, Tune by Wester's Garage |
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| Weavsvet | Re: I need more air........... | ||
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Senior Guru
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It was a good morning for a dyno run or two or three. Mid 60's with low humidity, about 40%.
Picked up some air flow from the addition of either the Delphi MAF or the 58mm throttle or the weather, who knows. It got to 348g/s this time. No adjustments to the tune because I could not data log the last dyno session. Now I can though. I'm believe I'm going to have to advance this cam 2degrees if not 4. I can't be spinning this 97K bottom end to 6700 rpm. I was afraid this would happen going with the AFR's instead of LE's LE2. I really need you Gurus to advise on which I should do. 2* or 4*. Isn't the rule of thumb 500 rpm for every 2* Advance? What kind of drawbacks come with this, any? How about street manors, are they affected? I presume I'll have to get my tuner to adjust the tune accordingly. I'm going to install TPIS 1 3/4 headers next week. Will this push the rpm up even more? Here's all three pulls in SAE with the smoothing at 0. The first pull was done with the stock exhaust system. The second pull was with the cutouts 1/2 open. The third was with the cutouts wide open. It seemed to like this best.  Or if you prefer the standard correction here are some numbers for it. Personally I like this graph better.   |
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Posted on: 2010/7/3 14:23
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1996 Corvette Coupe,AFR 195 street Eliminators,Edelbrock LT4 Air Gap intake manifold,9.5" 2800 stall,TPIS LT headers,Bullet 226/230.565.565/111 lsa cam,1.7 Scorpion rr's,EWP, X Pipe, Stock Exhaust,Elec.Cutouts,Dana 44/3.45, Tune by Wester's Garage |
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| Steve40th | Re: I need more air........... | ||
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Elite Guru
 
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I would start looking at building a 383/396 bottom end and go enjoy this engine.
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Posted on: 2010/7/3 14:28
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Ko'u ohana aia ku'a ikaika |
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| Weavsvet | Re: I need more air........... | ||
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Senior Guru
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Yeah well that is my plan eventually Steve. I wanted to drive this one for a while though. I got a lot of money in this and it's going to take a while to get the funds back up. I was hoping advancing the cam would buy me some time. |
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Posted on: 2010/7/3 14:33
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1996 Corvette Coupe,AFR 195 street Eliminators,Edelbrock LT4 Air Gap intake manifold,9.5" 2800 stall,TPIS LT headers,Bullet 226/230.565.565/111 lsa cam,1.7 Scorpion rr's,EWP, X Pipe, Stock Exhaust,Elec.Cutouts,Dana 44/3.45, Tune by Wester's Garage |
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| Weavsvet | Re: I need more air........... | ||
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Senior Guru
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Here the 3rd pull log file.
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Posted on: 2010/7/3 14:37
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1996 Corvette Coupe,AFR 195 street Eliminators,Edelbrock LT4 Air Gap intake manifold,9.5" 2800 stall,TPIS LT headers,Bullet 226/230.565.565/111 lsa cam,1.7 Scorpion rr's,EWP, X Pipe, Stock Exhaust,Elec.Cutouts,Dana 44/3.45, Tune by Wester's Garage |
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Dyno pull after 58mm cut outs wide open.csv| flyboy | Re: I need more air........... | ||
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Elite Guru
 
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FWIW, given the rpm /flow limitations of a ported LTR setup and the H.P. peak of the LT4 hotcam +-6200, depending on who you listen to, after much reading and gnashing of teeth I decided to install the cam 4* advanced to theoretically lower the power curve about 500 rpm's. I think I succeeded and am very happy with the way the car runs. See the recent thread, "My '91 on the dyno". I do not know how the graph would look had I installed the cam "straight up".
Lobe center line comes into play also and where your intake valve closes etc. all things you have to consider for your specific cam.. |
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Posted on: 2010/7/3 16:12
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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| Weavsvet | Re: I need more air........... | ||
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Senior Guru
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Thanks flyboy, this is he kind of info I need.  |
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Posted on: 2010/7/3 16:14
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1996 Corvette Coupe,AFR 195 street Eliminators,Edelbrock LT4 Air Gap intake manifold,9.5" 2800 stall,TPIS LT headers,Bullet 226/230.565.565/111 lsa cam,1.7 Scorpion rr's,EWP, X Pipe, Stock Exhaust,Elec.Cutouts,Dana 44/3.45, Tune by Wester's Garage |
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| dan0617 | Re: I need more air........... | ||
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Senior Guru
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I honestly don't know if it would be worth it for you to tear back into it to change the cam advance. I don't know that much about it.
When you go to a 383 in the future it will effectively lower the peak power rpms some, as more cubes eat up more cam. If I were in your shoes, I'd be very happy with the results. Shifting at 6200 isn't going to hurt your power/drag times as much as you think. I would drop down to 1.5 rockers to effectively lessen the cam a little, and go enjoy it! |
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Posted on: 2010/7/3 17:48
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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| Weavsvet | Re: I need more air........... | ||
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Senior Guru
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That was my other option of course. Just drive it and pay attention to the shift. Might do it that way. Thanks Dan. |
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Posted on: 2010/7/3 18:14
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1996 Corvette Coupe,AFR 195 street Eliminators,Edelbrock LT4 Air Gap intake manifold,9.5" 2800 stall,TPIS LT headers,Bullet 226/230.565.565/111 lsa cam,1.7 Scorpion rr's,EWP, X Pipe, Stock Exhaust,Elec.Cutouts,Dana 44/3.45, Tune by Wester's Garage |
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