Guest zfan Posted February 1, 2004 Share Posted February 1, 2004 Well I put the Z on the Dyno today. I have a 383 sbc 40 over at 11.20 to 1. Roller cam, comp cam 236/242-553/540 with 110 lobe seperation. Weiand stealth dual plain intake, Canfield 200cc heads, Holley 750 proform dp carb. All MSD ignition with 35 degrees timing. Long tube headers with 2.5 dual exhaust. Built 700r4 with 2600-2800 stall..I know from the dyno sheet that the stealth intake is holding me back so I am putting my Victor jr. back on. 1rst run was 315 hp at 5000 and did not change until 6200 were it dropped torque was 360 at 3000 and did not drop until 5000. 2nd run was 314 hp and 367 tq 3rd run was 317 hp and 370 tq The guys who worked the dyno and my friends as well thought that the place that needed work was in the intake area as it just seemed to flatten out at 5k. Next week I will port match my Victor jr. to match the Canfield heads and felpro gaskets. My Z with this combo has gone 11.60 at 119 and weighs 2770 with me in it. Mike Quote Link to comment Share on other sites More sharing options...
80LS1T Posted February 1, 2004 Share Posted February 1, 2004 Nice numbers & times! 8) Be sure to post when you get the Victor Jr. intake back on and dynoed! I'm interested to see how much difference there is. Guy Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted February 1, 2004 Share Posted February 1, 2004 Those numbers don't seem too spectacular to me but DANNNG do you have the track times to back it up!! I never would have guessed a trap speed like that with only that much power. Very nice 8) Quote Link to comment Share on other sites More sharing options...
Guest ON3GO Posted February 1, 2004 Share Posted February 1, 2004 pretty good numbers, and great trap speeds.. Z06 territory... but like 6 tenths faster what tires were used with those times? congrats mike Quote Link to comment Share on other sites More sharing options...
Muskrat Posted February 1, 2004 Share Posted February 1, 2004 Pretty good times Mike. Just think though... The easiest weight reduction is the driver. I'm flyweight, I swear. Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted February 1, 2004 Share Posted February 1, 2004 The guys who worked the dyno and my friends as well thought that the place that needed work was in the intake area as it just seemed to flatten out at 5k. Those numbers don't seem too spectacular to me but DANNNG do you have the track times to back it up!! I never would have guessed a trap speed like that with only that much power. Very nice 8) Curious, did the dyno have anything that attached to your intake? With an 11.60 in the quarter mile, it sounds more like when you ran the quarter you were making more power. If there was anything restricting the intake when you were at the dyno, you would not be able to see the peaks. I would think that there was something restricting your intake and that your HP peak is somewhere between that 5000 and 6200. I'd say try another dyno... Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted February 1, 2004 Share Posted February 1, 2004 is it possiable to post a picture of the dyno graph? those numbers look lower than normal (keep in mind guys that 317hp at the rear wheels is approximately 400 flywheel hp) Quote Link to comment Share on other sites More sharing options...
80LS1T Posted February 1, 2004 Share Posted February 1, 2004 He may have "low" HP but the TQ is pretty good! That's whats getting him into the 11's isn't it? Guy Quote Link to comment Share on other sites More sharing options...
Corzette Posted February 2, 2004 Share Posted February 2, 2004 Mike great times on 315HP. I cant wait to get to the track. Once you port match the VJr. Youll be impressed! I say 10s are getting closer! CorZette Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted February 2, 2004 Share Posted February 2, 2004 He may have "low" HP but the TQ is pretty good! That's whats getting him into the 11's isn't it? Guy Torque is what physically does the work, but HP is how you calculate acceleration. If you have 3000 ft/lbs of torque at 2 RPM it isnt going to get you anywhere very fast. What grumpy said is a good point, this is about 400 flywheel HP, which is great power. I still think that it is unusual for the curves to flatten out for that long and wouldnt be surprised if there is a peak at least 30HP higher than the flat spot. I am just curious if that peak came out on the 1/4 mile. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted February 2, 2004 Share Posted February 2, 2004 I will try to post the dyno print out later today. I was a little suprised in the lack of HP but happy with the torque. Hopefully the port matched Victor Jr. will help! Mike Quote Link to comment Share on other sites More sharing options...
Pyro Posted February 2, 2004 Share Posted February 2, 2004 ZFan, Are you using stock length push rods? Normally Canfield heads require +0.100 to +0.160 longer push rods to keep the rocker arm/valve tip geometry correct. This could effect power numbers also. Any fuel ratio data??? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted February 2, 2004 Share Posted February 2, 2004 we have all heard it, " you need massive low rpm tq" "you need a screaming high rpm hp peak" well heres some info, More in-depth description: http://www.revsearch.com/dynamometer/torque_vs_horsepower.html http://www.dynacam.com/Product/Torque_vs__Horsepower/torque_vs__horsepower.html http://vettenet.org/torquehp.html http://auto.howstuffworks.com/horsepower4.htm http://homepage.mac.com/dgiessel/engine/hpvstq.html first thing to keep in mind is that theres no such "thing" as horsepower, horsepower is a mathmatical formula for the RATE at which TORQUE can be applied the formula for hp is (tq x rpm/5252=hp example 450 ft lbs of torque at 3000rpm=257hp 450 ft lbs of torque at 6000rpm=514hp because the torque at the higher rpm useing gearing can be applied faster here read this http://www.69mustang.com/hp_torque.htm http://www.ubermensch.org/Cars/Technical/hp-tq/ http://vette.ohioracing.com/hp.html where most guys go wrong is in not correctly matching the cars stall speed and gearing to the cars tq curve, if you mod the engine for increased high rpm performance but fail to also match the stall speed and gearing to that higher rpm tq curve much of the potential improvement is wasted. example in the close to stock engine above, the engine should be geared to stay in the 3500rpm-5000rpm range for max acceleration (lower in the rpm range if mileage is a big factor) in the moded engine above the rpm range moved to 4000rpm-6500rpm requireing differant rear gears and slightly higher stall speeds to gain max acceleration in the same car, you should readily see that a trans that shifts at 5000rpm will work in the first example but would waste most of the power curve in the second example,where shifting at 6500rpm under full power acelleration would make more sence. a 3.08 rear gear and 700r4 trans matches the first example well but it would take a swap to a 3.73-4.11 gear to allow the engine in the second example to keep its most effective power band matching that second power curve well. links youll need to figure out correct rear gear ratios http://www.miata.net/garage/tirecalc.html http://www.wallaceracing.com/reargear.htm http://users.erols.com/srweiss/calcmph.htm http://users.erols.com/srweiss/calcrpm.htm http://users.erols.com/srweiss/calcrgr.htm http://www.prestage.com/Car+Math/Ge...io/default.aspx http://www.geocities.com/z28esser/speed.html http://server3003.freeyellow.com/gparts/speedo.htm http://www.pontiacracing.net/trannyratios.htm http://www.tciauto.com/tech_info/gear_ratios.htm Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted February 2, 2004 Share Posted February 2, 2004 My cabobulator says 11.60 @ 119 with 2,770lbs = 356RWHP. So much for translating dyno HP to real world racing. Compare that dyno HP number to your next pull on the same dyno and nothing else. Looking forward to seeing it run at SEZ4. Quote Link to comment Share on other sites More sharing options...
Phantom Posted February 2, 2004 Share Posted February 2, 2004 Mike - remind me not to put my car on your dyno. You absolutely kick my but and mine dyno'd at 311 rwhp & 326 rwtq. on the Alamo Autosport dyno. Does give me hope though. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted February 2, 2004 Share Posted February 2, 2004 Bill, You will be suprised when you get some real sticky tires underneath her. Pyro, no the push rods are +0.15 longer than stock. They were test fitted. Nic, Nothing was attached to the intake, did find throttle only opening 90 percent but probably cost me only 10 hp at the most. Scottie, That's close to the numbers I would have thaught were correct. Look forward to meeting you and the gang at SEZ4. Mike Quote Link to comment Share on other sites More sharing options...
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