first passes with new setup
05-12-2014, 02:11 PM
#1
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first passes with new setup I built a 1985 mustang. The build is a stock long block 5.3 with ms3 cam and full bolt ons. The race weight is 3310 with me in it. This is my first carb setup on an ls. I am running msd 6010 with vic jr. and a 750 holley double pumper. My best pass was a 12.59 @ 110.51 mph. This was shifting at 7000 rpm. My afr was high 11s so I know it has some left in it, My timing is 34 degrees after 3000 rpm. I have 3500 converter. What are your guys opinions on timing and afr on this setup. I am looking for low 12s. Also I know I am leaving some on the table since also I am running 18x10 cobra wheels on all four corners. My best 60ft was a 1.96 dead hooking. I now have my carb rejetted to 12.7 to 12.8 afr. I will try it agin and see what happens.
05-12-2014, 02:27 PM
#2
I built a 1985 mustang. The build is a stock long block 5.3 with ms3 cam and full bolt ons. The race weight is 3310.............................My best pass was a 12.59 @ 110.51 mph............................I was shifting at 7000 rpm...................I have 3500 converter..................................My best 60ft was a 1.96 dead hooking.
In looking at your combo, you have some mismatches that are costing you. That camshaft was designed for max effort 5.7+ liter engines with factory style, long runner EFI intake manifolds.
At the risk of being too technical, the camshaft is a little too big and closes the intake valve too late for what you are doing. That problem is compounded by your relatively low 3500 RPM stall, smaller displacement and potentially lower compression.
Some really strong evidence for you is your "1.96 dead hooking". You are losing about 2 to 3 tenths right there.
I know you just got it out there and there is a lot of tuning and tweaking yet to be done, but a smaller custom camshaft similar to mine could go a long way toward waking up your combination.
05-12-2014, 02:31 PM
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lol. Ya I know there is some left on the table. I built this setup primarily for nos. I was seeing what it will do na first. I think by leaning it down from 11.8 to 12.8 should net some gains. I am looking for just a couple more mph and a few tenths out of it na. Then I am going to spray a 150 shot right out of the hole with it.
05-12-2014, 02:39 PM
#4
When I first put mine together it was over-rich also. I only picked up a tenth or less and just under 1 MPH in the quarter when I cleaned it up. If you haven't yet, try both more and less timing. These LS engines behave quite differently with a carburetor on them than the EFI guys engines do. And, they seem to vary quite a bit from set up to set up. Mine only likes 27 degrees total timing while others have found as much as 37 works for them. It seems to depend a lot on which heads, how much compression and how much camshaft.
I would make sure you get your N/A timing optimized before your spray it. Once you do, if yours is anything like mine, it will really light up when you hit is with the happy gas.
I would make sure you get your N/A timing optimized before your spray it. Once you do, if yours is anything like mine, it will really light up when you hit is with the happy gas.
05-12-2014, 04:25 PM
#6
I agree with Speedtigger on the cam shaft and converter.
Definitely get some better tires lol
Good luck and welcome to our world
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05-12-2014, 04:51 PM
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Ya next time out I will try 7500 or so. I have a 3.73 gear, That's the max gear I can have with a 150-200 shot other wise it will be over 8k to run 135 mph.
I am not opposed to running a different cam. I really don't care about driveability. its just a toy. I just always read that the ms3 with nos was very good setup with a 5.3.
I am not opposed to running a different cam. I really don't care about driveability. its just a toy. I just always read that the ms3 with nos was very good setup with a 5.3.
05-15-2014, 08:37 AM
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Alright guys. I got some different wheels. I went with 15 inch wheels all around with slicks on the rear now. The difference in weight from the 18s is 13lbs a wheel. That should net some gains since it is rolling mass. And i got the carb set to 12.7ish afr. Our next race is in 3 weeks so ill post the results. I would like to see a couple of tenths. Maybe a 12.2-12.3 at 112 or so.
05-15-2014, 10:54 AM
#12
Take a look at anything inside the car you could do without... Rear seats, extra interior panels, carpeting.. Anything to help lose weight. I tried a friend of mine in my S10 and he weighed in at almost 300 pounds less then me. He wasn't even really pushing the truck and gained .22 seconds over what I ran in the 1/8th. If I put him in the truck and turned on the bottle with the mini-spool installed, it would run really close to 7.50 in the 1/8th.
05-15-2014, 05:23 PM
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Kind of. the front are actually a 14x5 with a 185 tire and the rear is just a stock 15x7 aluminum mustang wheel. But it is still around 13-14 lbs a wheel difference which should knock off some time. Plus they are only 14 and 15s from the 18s I had one before.
06-07-2014, 08:24 AM
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Well I went to the track last night. I only got 2 runs cause it got rained out. The weather was horrible. Most people seemed to be off their times by around .4 of a second. My car slowed to a 12.73 from a preivious 12.59. I was a little disapointed but everyone seemed to be down. My car just seemed to be a little tame off the line with the new afr of 12.8 campaired to the 11.9 it was. I have checked plugs and they looked good on both the 11.8 and the new 12.8 afr. I am actually thinking about adding more jet into it. Once in a while i have a bog that showed up by switching jets. Maybe my combo likes more fuel. Please give me some insight. Thanks
06-07-2014, 09:56 AM
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Ya it is very common for us to have 4000 plus in the summer. But the weather was close enough day to day that I lost 40 lbs of wheel weight and still was almost .2 slower and 2 mph. Maybe my engine likes the 11.8-12.0 afr or with my cam the wideband isn't the best tuning tool at wot. But It all around ran much better when it showed low 12,s on the afr. So i am going back to those jets and giving it another try.