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08-19-2008, 09:18 PM #1
MKI Silver Slug results for PacNW Portland Nationals.
Whelp... For those of you who are ever wondering what a stock 5ME does in a 81 MKI.... Here are some interesting results for you.
Info: 81 MA47 MKI. 2.8L 5ME, A43D Slushbox tranny, 3.73 rear. Drivetrain status: 106.8K miles (approx 48K miles & 5 years since last dyno pull). Stock 195/70/14 BFG Radial TA's. Basically ZERO engine mods other than: A. Amsoil 10W30 synthetic in the motor. B. Redline Racing ATF in the tranny (this is Redlines TYPE F application, which is what this tranny uses, NOT the DEXRON varieties). C. Union 76 87 octane "regular" gas w/ a bottle of Redline SL1 EFI cleaner (long trip was a good excuse to clean the injectors).
Tim Robards, who was running the dyno for everyone, had the bottom screen set for speed mph, rather than engine RPM's, thus I'm trying to go on memory on when I started my pulls. He basically said "start when the speedo gets to 55mph". I'm always staring at the tach when I do dyno pulls in mine & other peeps cars, so I had to take mental notes of where the tach was. 55mph in 3rd gear, the tach was around 2800 - 3000 rpms. I asked Tim if I could start a little lower, since peak torque on this motor was at 3.6K rpms, I wanted to see a nice long rise & peak on the torque readout.
The reason why the graphs are not looking very consistant before 70 mph, is because I was slowly easing into the gas, so that the tranny would not downshift into 2nd gear. Which was a concern for me, I wanted to make sure that the graphs showed clean 3rd gear pulls all the way.
Results are at the top of the page. the very TOP lines are the torque readings, the BOTTOM is HP.
Basically, I did the good HP on the 1st run, but the better torque results showed up on the last pull.
I let off at just a little after 100 mph, which was around 5600 rpms (5800 rpms, is redline on a 4ME/5ME). I did notice on the last 300 rpms it was a little bit of a struggle to get to 5600. Considering that peak HP on a 5ME is at 4,800 rpms, I'm glad it made it that far.
And yes. At the bottom of the sheet, they were also pulling Wideband. At least there are no surprises here. Motor is at least pretty healthy for one that turned 107K miles on the way home. That was originally rated @ 116 HP crank & 145 ft lbs tq. 27 years ago.
Drag Results: Car has NEVER been drag raced before (I've raced the MKII at least 2 - 3 times, all in Las Vegas/SILV).
1/8 m 11.620
(the lazy butts @ PIR don't list times for the 1K ft mark)
1/4 m 18.061
1/8 m 11.852
1/4 m 18.383
3rd (& last) pass:
R/T .555 (WOOHOO, leaving quicker!!).
1/8 m 11.940
1/4 m 18.536
So yep. While my R/T's were getting quicker, my trap times & speeds were getting slower (was loosing 1/2 second). I pretty much decided at that point to call it good. Outside temperatures were too hot & I'm betting that the slower times was the result of "something was getting heat soaked". Temp guage was fine & motor was not getting hot. At this point, I'm guessing it's the tranny. Even though the A43D is running a Full TYPE F Synthetic & the stock tranny cooler by the radiator, it probably did not help that I was power braking a little bit at the line after tripping both stage lights (to about 1,500 rpms). Basically the slight reason for the power brake was that there was a slight tranny hesitation (that I've noticed in the past) when I stomp on the gas when I leave a stoplight. If I ease into the gas, obviously the car leaves right away. From "testing at stoplights" I've noticed that if I stomp on the gas, the motor revs up, till it hits the tranny's 2,000 rpm stall converter, THEN the car moves forward... Also I wanted to make sure that oil pressure was at a decent reading. So I was working on trying to get decent R/T times, but all the while the tranny was probably starting to heat up a bit. Whoops..... Next time, I'll try leaving @ idle & see what it does w/ my 1/4 mile times.
Still had lots of fun running the Silver Slug down the 1320 for the VERY 1st time.... Now I know what it can do.... Yay!!
Last edited by CJSREDPRA; 08-21-2008 at 06:17 PM.Chris Eng
1981 MA47 Silver Metallic 5ME Automatic
1985 MA67 Super Deep Red 5MGE 5-speed
Member PacNW Supras/www.celicasupra.com
Quote from Popular Science
Despite the constant physical and--judging by the twitchy, panicked expression--mental punishment inflicted on him by Dr. Bunsen Honeydew窶冱 experiments, Beaker keeps coming back for more. Clearly the Jackass crew grew up ingesting a healthy dose of these Muppet Show regulars.
08-19-2008, 09:59 PM #2
I just went in my MX63 with a GE and noticed that I needed to keep the RPMs up to keep the mechanical fan from coming on(put in neutral and held 2000rpms).
I first ran a 75mph 19.0 with the mechanical fan and ac on(oops) 60' was 2.9.
77 mph at 18.2 with a 2.7 60'
Both were done in Performance and with both feet down on the pedals after staging. I was going to try the short shifting Econo Setting on the trans to see if the dog slow top end was part of the problem as the motor is still torquey and barks 2nd and sometimes 3rd on the street.
08-19-2008, 11:27 PM #3
70hp and 70ftlbs at 5500rpm
Now THAT's performance right there...
Good writeup Eng, looks like you had fun.
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