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  #16 (permalink)  
Old 07-04-2012, 07:51 AM
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Not to hijack the thread, but here is my graph.
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  #17 (permalink)  
Old 07-04-2012, 08:22 AM
How fast is fast enough?
 
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Do you have any other data from the run? Specifically manifold pressure and afr/bsfc?
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Old 07-04-2012, 08:42 AM
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Quote:
Originally Posted by ap72 View Post
Do you have any other data from the run? Specifically manifold pressure and afr/bsfc?
Nope. Thats it. We have a chassis dyno at our annual club event, and after doing some tuning and changes I decided to make a couple of pulls. The second pull that was down on power was when it was at 220 degrees.
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Old 07-04-2012, 08:47 AM
How fast is fast enough?
 
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That engine peaked early for the cam compression and heads. I wonder how much that carb knocked off peak, or if it was from exhaust backing up. Without any diagnostics its hard to say what's going on. Looks like it performed well where you drive most of the time though.
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Old 07-04-2012, 09:02 AM
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Quote:
Originally Posted by ap72 View Post
That engine peaked early for the cam compression and heads. I wonder how much that carb knocked off peak, or if it was from exhaust backing up. Without any diagnostics its hard to say what's going on. Looks like it performed well where you drive most of the time though.
Techinspector1 ran a dyno sim on it a while back with a couple of different scenarios. With an 800 cfm carb and 1 3/4" primary headers he said I would gain about 14 ponies. Not cost effective in my book. I like the streetability of the 680 and couldn't afford the 800 bux for 1 3/4" tubed headers. I sent the carb out to be computer calibrated and they changed the jets and air bleeds. When I got it back and did a plug reading I found that it was a bit lean so after numerous runs and jetting I found that I needed 1 size larger on the proimaries and two sizes larger on the secondaries. Been running like a champ ever since.
Tha cam is a rather low rpm cam, also. It's the Edelbrock 2201 Hyd Roller .539/.548 lift and has an operating range of 1500 to 6500. I think I could free up a few more ponies with the 1 3/4" headers but not for the price. Also, I know the E-Tec 200 heads are not the best of the bunch.
If I figure the 20% loss thru an auto trans it should be close to 475 hp and 495 lb/ft. I don't think thats bad for as mild of a build as it is. Obviously, a more vicious cam and a set of CNC ported AFRs would be a radical change.
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Old 07-04-2012, 09:58 AM
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Greg T:

That Dyno jet graph looks like what I would expect from your 383 on
that dyno.
380HP is what the OP should be getting too.

Have you ever run that combo down the drag strip? vehicle weight w driver?
ET? MPH? from time slips.
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Old 07-04-2012, 10:07 AM
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Originally Posted by F-BIRD'88 View Post
Greg T:

That Dyno jet graph looks like what I would expect from your 383 on
that dyno.
380HP is what the OP should be getting too.

Have you ever run that combo down the drag strip? vehicle weight w driver?
ET? MPH? from time slips.
Nope. Never had it down the strip. This is a 96 C1500 short box (see avatar) that I'm guessing weighs close to 4k with me in it. My nearest strip is Kaukauna (WIR) and thats about 150 miles from here. Some day, when I get the rear end stabilized (cal-trac bars) and throw some stickies on I'll haul it down there. I've got 4.56 gears in there with 30" tires at the moment.
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Old 07-04-2012, 10:18 AM
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It should haul pretty good.....
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Old 07-04-2012, 10:26 AM
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Originally Posted by F-BIRD'88 View Post
It should haul pretty good.....
I'm hoping. I've never done the math but I'm hoping for high 12s anyway. That may be a stretch with that kinda weight.
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Old 07-04-2012, 08:59 PM
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Originally Posted by sapsz28 View Post
I have just finished building a 406 sbc stock crank scat 5.7 7/16 cap screw rods speed pro flat top forged pistons 5 cc valve releifs RHS Pro Action aluminum heads 200 cc runners 72 cc chambers howards hydraulic roller cam,241 int-245ex duration @50 . 545 int 565 ex lift 110 lsa matching lifters crane roller rockers 1.5 ratio, rpm intake holley hp ultra 750 dp cfm carb msd streetfire hei.1 3/4 headman headers .
I had it dynoed on a dynatech roller dyno it showed 427 ft lbs of torque at4200 rpm and only 319 hp at 6000 rpm fuel ratio was perfect throughout the run timing was 34 degrees tried with and without vaccum cannister less torque withe the vaccum canister hooked up fuel pressure was steady at 6 psi i cant figure out why these rear wheel numbers were so low am I doing something wrong does she need more air,such as a team g intake maybe or more fuel or cfm any advice.After 1500 miles took her to the track ran a 12.98@ 105.72 mph in a 1980 Z28 with a 3:42 rear and a M21 4 speed and firestone radials was not to impressed but for a daily cruiser not bad i guess. It just seems there should be more power coming out of of her any advice would be helpfull I was thinking about porting the heads an go with a 2.08 intake valve and perhaps a beehive spring set up. Im stumped any help please would really be appreciated.
We run a 355ci in a 81 camaro! it has a dp intake-770cfm holley-world products 200cc heads-with comp cams 540-563 with a 110ls has 1-3/4 headers with 3in exhaust with xpipe! but we run a 700r4 with a 3k stall and 3.73 gears. it runs between 12.0 and 12.20 traps 111mph on motor. have no clue on rwhp # never been on a dyno. So i would think your car should run better than the # it did. I dont like dynos they will hurt some feelings! My bbc didnt put down but 349 an 467. but it ran 7.42 at 94 and 11.40 at 117mph. i hope you get it figured out.
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Old 07-04-2012, 10:28 PM
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Chassis dyno numbers are a crapshoot. OK for comparing changes made to the engine if it's run on the same dyno, but comparing the numbers to a different dyno is almost useless IMO.

Quarter mile standing start mph is a good indication of real world HP.
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Old 07-05-2012, 10:33 AM
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i may have over looked it but what intake are you using? i like a victor jr or team g myself. they don't hurt big motors on bottom end. also a bigger carb wouldn't hurt. a better cam from a company like comp or isky wouldn't hurt either, or you could give jones cam designs a try. try it with open headers too, & your ignition or fuel delivery could be off.
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Old 07-05-2012, 02:11 PM
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id go with a super victor intake, and 220cc runner heads along with a super sucker 2" carb spacer

The RHS heads are great but you really need a 220 runner head on that 400 people say bla bla bla but I ran the 220 CC RHS heads on a .030 327 with only 10.5:1 in a 74 nova that ran 7.30's 1/8 mile and yes I shifted it @ 7000 Track times is far more important than any "advice" never forget that
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Old 07-05-2012, 08:50 PM
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horsepower stumped

Hey F-Bird I checked the throttle andf when the pedal is to the floor the carb is wide open full travel, air fuel ratio at WOT was 12.1 and in cruise mode any where from 13.0 t0 14.3 the secondarys are 76 size jets I havent checked the primary.
my 60ft time is 2.079 my reaction time is.077,launched at 2500 rpm any higher with the firestone firehawks and it would smoke them,my 330 ft mark time is 5.625 my 1/8th time is 8.655 @ 81.34mph my 1000ft mark time is 11.246 does not show mph for that my 1/4 mile time is 12.98@104.47.
Yes we did go over the tranny issue it is a m21 with a low 2.20 fist gear,and the rear is a 3:42.
heres one more for you with a 26 inch tall tire and 1.1 final drive with a 3:42 rear end how can I be revving 3000 rpm @ 100 KMH or 60 MPH Ive tried 3 different tachs all set to 8 cylinder auto meter,auto guage and sun pro,as well my GPS was reading 100 KMH @ 3000rpm and I had a police officer friend clock me 4 times with my speedometer reading 100 kmh and his lazer gun read 100 kmh double stumped now but I'll stick with the first issue for now should I hollow out my converters. i really dont know where to start,

Thanks for taking the time everyone to help me out.
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  #30 (permalink)  
Old 07-06-2012, 12:19 AM
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You either have 3.73's or the 26" tires are shorter than 26"
(measure from the axle C/L to the ground x 2 or true loaded tire diameter.)

The 1/8th mile et-- mph convert to 13.58@ 103.30MPH
That means the first half the 1/4 mile was down on power and it recovered and pulled hard on the 2nd half of the run. (missfire, you let off, bad, slow shift etc)
The launch 60ft time needs a lot of work. Gears, traction.

jetting seems odd. should be 70 to 74 pri and 80 to 85sec for that carb.

1/8th mile ET x 1.57 ='s 1/4 mile ET
1/8th mile MPH x 1.27='s 1/4 mile MPH.
If they don;t work out real close you know there is something wrong with the car.

jsut from the numbers I see .038sec missing from the et and .92 MPH missing from the 1st half the run.
could have been severe tire spin after the launch. thru 1st and 2nd gears. (lack of traction.)
The car needs gears, The sticky tires are here waiting for you to pick them up

Last edited by F-BIRD'88; 07-06-2012 at 12:30 AM.
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