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hp question
just took car to dyno, not pleased with the numbers
just looking for some input 500hp at 5200rpm here is the combo 500 ci mopar 12.5:1 cr 700 lift cam prostock roller lifters port and polished aluminum heads 1.5 roller rockers, bird catcher with alky 38 degree timing msd 7al2 the lamda was .7 on both sides egt ranges 990-1040 F 5000 stall converter, JW ultraglide, strange 9" with 4.10 progears 33x15.5 slicks i know it was running rich but power should be much better the first time i went to dyno(different one) i made 610hp at 5000rpm before trans issue.(bad pump) thanks for the input |
The EGT numbers look ok but the Lambda number seems really rich. Here are some numbers I have for conversion from Lambda.
Lambda alcohol gas 1.000 6.450 14.700 0.990 6.386 14.553 0.980 6.321 14.406 0.970 6.257 14.259 0.960 6.192 14.112 0.950 6.128 13.965 0.940 6.063 13.818 0.930 5.999 13.671 0.920 5.934 13.524 0.910 5.870 13.377 0.900 5.805 13.230 0.890 5.741 13.083 0.880 5.676 12.936 0.870 5.612 12.789 0.860 5.547 12.642 0.850 5.483 12.495 0.840 5.418 12.348 0.830 5.354 12.201 0.820 5.289 12.054 0.810 5.225 11.907 0.800 5.160 11.760 0.790 5.096 11.613 0.780 5.031 11.466 0.770 4.967 11.319 0.760 4.902 11.172 0.750 4.838 11.025 |
Again, not being a wiseass, but . .
Tire guages aren't the same, one reads one thing, the next may be a half pound different. Same with Dynos . . It's all relative. When you changed Dyno's you started over . . Jus' a SWAG here, but take 2° out of it, lean it out two steps and try it again. Dunno what yer air is but I've never seen many 500" alky engines that liked more than 33-34° of lead . . 'Course, I've always dealt with blown alky engines so there may be some difference. Take it to the track, as I said in another thread, the race track is the most honest Dyno ever created . . |
listen to Roadkill2
Originally Posted by roadkill2
Again, not being a wiseass, but . .
Tire guages aren't the same, one reads one thing, the next may be a half pound different. Same with Dynos . . It's all relative. When you changed Dyno's you started over . . Jus' a SWAG here, but take 2° out of it, lean it out two steps and try it again. Dunno what yer air is but I've never seen many 500" alky engines that liked more than 33-34° of lead . . 'Course, I've always dealt with blown alky engines so there may be some difference. Take it to the track, as I said in another thread, the race track is the most honest Dyno ever created . . -it sure does sound rich with those readings, as roadkill2 sez, why not lean it out and see if it responds ET wise.. -also agree on taking a bit of timing away to start with..you can always play with that once you get the fuel closer.. |
I think im going to stay from the dyno for awhile.
Just want a guestimate of what it should make. |
Originally Posted by dartsteve
I think im going to stay from the dyno for awhile.
Just want a guestimate of what it should make. -why not 1100-1200F on the pyro? -why not .8xx on the Lambda? -what do the plugs look like? burning any plating off the base? |
Your EGT looks really low. How many RPM did you pull it to?
I also agree 38 degrees seems a bit much, but every motor is different. |
6000rpm
Plugs looked clean Headed to track tomorrow night i hope to have pics and slips Plan is to do one pass then make some changes. |
Originally Posted by dartsteve
6000rpm
Plugs looked clean Headed to track tomorrow night i hope to have pics and slips Plan is to do one pass then make some changes. -check/set valve lash -pull some fuel out slowly....watch your timeslips! :wink: -have fun |
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