The 83GT

BigBlockRanger wrote:I am running an old Megasquirt MS1 with the MSextra code base loaded.  It is a batch fire, speed density ecu and is really pretty simple.  I use a TFI distributor to trigger the ecu.  It does not do anything other than send a trigger signal to the ecu.  The MS controls the actual timing.  The rails were blanks that I cut to length, drilled the injector holes, and tapped the ends.  The injectors are 62lb/hr GT500 injectors.  The throttlebody is a Pro-M Racing 1000cfm 4bbl unit that I had sitting around.  As far as efi systems go, it's on the primitive side of things, but it works well enough for me.   The ecu will handle as much hp as you have fuel system to support.

cool thanks for getting back to me..
i am loking at adding a efi system to my 385 series . as i am goiong to be adding twin turbo this winter , just seen your system looked pretty decent .
it is hard to program and such? would i be better of just getting one of the throttle body fuel injection system with the 4500 dom flange on it they are good for 1500hp?
so on your system would you just add bigger injectors if you wanted more horse power?

Those kind seem to work. I have never used one though. I am a diy guy so I enjoy the challenge of figuring out how to piece things together to make stuff work.

I think it is easy to tune. With a good wideband, it's not real complicated once you get it up and running. Of course I am not a serious racer or pro tuner. I get by on "close enough is good enough" and don't try to put it on a razor blade tune.

More power would require bigger injectors and an upgraded fuel pump.

ya i here ya diy systems are fun and the challenge is worth it in most situations . you prob have a better system in the end and you know exactly how everything works this way as well. still researching the fi route as i want to switch over once i turbo as for more tuneabilty .

Seems Like the Multiport would have the advantage if you wanted to go to different size injectors down the road.

How much boost were you planning to run again?

426 Hemi Scoop for the Win. My old racing buddy put one of those on his Notchback. I thought it looked like shit at first but, it grows on you. The black two tone on the Hood looks much better on yours.

The hood scoop was a gamble. My friends call it the pizza box. I originally put it on when I had the Dominator and 16" air filter. It would have needed a very large cowl hood to clear.

I like it. Dare to be Different! When we got my buddies lined out at the track and I saw the numbers it ran, it looked much better. He had it as a Screen Saver doing a Massive BurnOut in it's Mopar Plum Crazy Purple paint job with the big black scoop coming right at the screen. That 408W on the bottle was very impressive with a stinking hydraulic roller cam to boot.

I hope yours goes good too and I am sure it will.

Oh and PS: We got Brass Freeze Plugs over here in Texas you Know.

Haha I know. lol It used to run 10.teens with this shortblock, TFS 325's, a solid roller and a 1050. It will be slower in this configuration, but I don't care. If it gets in the mid/high 11's, I'll be doing back flips off the roof. Fingers crossed. I just needs to quit raining around here. We are about to float away.

One of my fav pics with the pizza box hood.

That's a nice shot of it. Stance looks great.  That Hemi Scoop makes it stand out from the 5.0 crowd. My buddies 408 went 6.50's on the gas, probably 200 or less shot, he claimed 150.

I wish you wood have not said rain, it just started pouring down here to west of H-Town.

BigBlockRanger wrote:Basic rundown of the 552:
4.5" cast RPM crank, RPM H-beams, Probe forged pistons. With these D3 heads (cleaned up intakes and smog bump deleted exhausts) it is right around 9.6:1. This intake is the same efi converted Victor I used in the truck. The throttle body will be the same 1000 cfm Mass-Flo (Pro-M) 4bb one the turbo 302 had on it. The cam is a Lunati Barebones hydraulic cam.
Cam specs: 0.536” / 0.567” 224/233 @ 0.50” 293/293 advertised 112 LSA ICL 107

I would love to swap the cam to something with a bit more duration, but I think I will leave it alone for RMRW.  I can always do it later.

Converter is a Hayes 2400-2800 that worked well in the truck. It may be a little tight in this car, but that is probably a good thing for the mountain driving part of this trip. Particularly since we will be pulling the little trailer.

Looking at the cam spec's and compression I bet when you put the juice to it you will be surprized!

I would start with a 150 shot on an engine that big. Those low and medium compression deals are a eye opener on the happy gas, at least in my experience. That tight stall is a major plus also.

What Gear are you running, I missed it?

It has 3.55's in it. Gotta keep it somewhat reasonable because it's our Raceweek car.

I doubt we will spray it on RW. We just don't have the time to monkey with it beforehand.

BigBlockRanger wrote:Haha I know.  lol  It used to run 10.teens with this shortblock, TFS 325's, a solid roller and a 1050.  It will be slower in this configuration, but I don't care.  If it gets in the mid/high 11's, I'll be doing back flips off the roof.  Fingers crossed.  I just needs to quit raining around here. We are about to float away.

One of my fav pics with the pizza box hood.

Send that Rain up this way to Northeast,Ohio we haven't had rain in a couple weeks and the grass is burning up and it was in the High 80's low 90's last week!!

BigBlockRanger wrote:It has 3.55's in it.  Gotta keep it somewhat reasonable because it's our Raceweek car.  

I doubt we will spray it on RW. We just don't have the time to monkey with it beforehand.

If you ever do spray it with those 3.55's , once it gets moving off the line it's going to fly.

Hope you don't freeze to death up there Mark, that's pretty cold to where we are at. Your welcome to 2 to 6 months of our rain, and you can have my grass with it.

Rained 2 more inches last night. We're about to float away. We're so flat here, there is nowhere for the water to go. All the storm water retention ponds are beyond capacity.

I will definitely spray it at some point. I might take the bottle and make a couple of hits on the last day with it. That way, the trailer is close. Haha.

Yea we are low here too. Usually the field gets standing water at about 6 inch's of rain. Our Ditch's aren't worth much either! House is  Very High so that's good. On the garage after Harvey we got cinder blocks and board's and put everting we wanted high so it would not get wet again as it is low and goes under with the smaller rains/floods. I remember checking the neighbors the night of this with the boy, and snakes swimming by, LoL. Good stories now, not so much then. Hope your rain Quits.

https://www.alamy.com/stock-photo/hurricane-harvey.html?sortBy=relevant


I would think your new combo on a decent shot of gas, 250 or less, would run as good or better then the high compression big cam deal all motor. I guess when you get a chance to try it we'll find out.

BigBlockRanger wrote:Rained 2 more inches last night.  We're about to float away. We're so flat here, there is nowhere for the water to go. All the storm water retention ponds are beyond capacity.

I will definitely spray it at some point.  I might take the bottle and make a couple of hits on the last day with it.  That way, the trailer is close.  Haha.

We haven't had rain in 18 or 19 Days here in Northeast,Ohio i think maybe Monday we might get some!!

We had a good night at the track. It was "Race A Cop" night and there were a lot of cars there. They usually have a "racecar" lane so we jumped in it all night. That allowed us to make several runs and not be stuck in a sea of cars all night.

First pass, the laptop came unplugged so I had no data. Let the car cool and made another run. It was crazy lean at WOT. Like 14-15:1 lean. We richened it up a lot, went back and.made another run. Car picked up about 0.4 sec so we were headed in the right direction. The fan relay died on the way to the pits and the car got up to 225-230. Swapped the relay from the Dixie horn and we were in business again.

Car was a little slower than I hoped. 12.40's @ 109. 1.70 60 foots.  DA was 6500 feet and the air temp was in the high 80's. Overall I was happy with it. It's about 3 tenths slower than the turbo 302, but mechanically it is way less stressed and worrisome. 12.40's with a 9:1, stock head, tiny camshaft big block with tight converter isn't bad. A different cam and a looser converter would really make this thing come alive. We were shifting at 6000, but looking at the logs, I think we will be better served to shift it at 5000 or so to try and take advantage of the gigantic torque this thing makes.  I have another cam ordered, but it has been on back order for several months now. Converter flashes to 3300. If it went to 4000-4200 it think it would be happier, but this one is GREAT in town and on the highway.

It ran like a top and it runs down the highway fantastic. I was worried about it staying cool, but it did great. 175 degrees on the way out there, and 165 degrees on the way back. 13.5-14.0 afr at 65 mph.

I wish we had another TnT night before Raceweek to play with the nitrous, but no dice. I think we may take it and give it a whirl on the last day.

BigBlockRanger wrote:We had a good night at the track. It was "Race A Cop" night and there were a lot of cars there. They usually have a "racecar" lane so we jumped in it all night. That allowed us to make several runs and not be stuck in a sea of cars all night.

First pass, the laptop came unplugged so I had no data. Let the car cool and made another run. It was crazy lean at WOT. Like 14-15:1 lean. We richened it up a lot, went back and.made another run. Car picked up about 0.4 sec so we were headed in the right direction. The fan relay died on the way to the pits and the car got up to 225-230. Swapped the relay from the Dixie horn and we were in business again.

Car was a little slower than I hoped. 12.40's @ 109. 1.70 60 foots.  DA was 6500 feet and the air temp was in the high 80's. Overall I was happy with it. It's about 3 tenths slower than the turbo 302, but mechanically it is way less stressed and worrisome. 12.40's with a 9:1, stock head, tiny camshaft big block with tight converter isn't bad. A different cam and a looser converter would really make this thing come alive. We were shifting at 6000, but looking at the logs, I think we will be better served to shift it at 5000 or so to try and take advantage of the gigantic torque this thing makes.  I have another cam ordered, but it has been on back order for several months now. Converter flashes to 3300. If it went to 4000-4200 it think it would be happier, but this one is GREAT in town and on the highway.

It ran like a top and it runs down the highway fantastic. I was worried about it staying cool, but it did great. 175 degrees on the way out there, and 165 degrees on the way back. 13.5-14.0 afr at 65 mph.

I wish we had another TnT night before Raceweek to play with the nitrous, but no dice. I think we may take it and give it a whirl on the last day.

It's good you got some track time in. Nice numbers too. I think if our track were still open, which was close to sea level, and you ran in some cooler weather here, it would have picked up quite a bit, into the bottom of the 12's.

Your times will probably pick up when you drop the shift point. I would try 5,500 Rpm first and then 5,000.

As far as the camshaft and convertor change picking up your times a lot I have to respectively disagree.
With 9/1 compression and stockish heads, you could go a little bigger/different on both, but at some point it will be counter productive, like much past the mid 230's on the exhaust side and of course less on the intake duration.
I would look into 108/109 LSA when you step it up. I don't remember the Lunati you have on order but, maybe that's what it is.

With the above being said, your current cam with the 112 LSA will be better on the gas.

When you spray it be sure your tune is right, and I think 10's should be pretty easy on a sticky track.

PS: Do you pack one of you Holley carburetors and a distributor for the big race, or is the change back to much trouble if you have EFI failure?

If we have an efi failure, it will get parked while we go get the trailer. The MS unit itself is fairly new and has worked really well. I am bringing a spare electric fuel pump and a spare electric water pump. My son and one of his buddies that just graduated with him from USAFA are going to drive this car. I am signed up for Roadweek (kinda like PowerTour for RMRW) and will drive his Ecoboost F-150 all week. The car trailer will stay in Kearney. I will be on hand for good times, tuning advice, impromptu repair help and photo-documentation. Haha.

Sounds like a blast. Congradulations to your Son, that was my Dad's old branch too.

Ecobooooost ready to roll!

The full Raceweek write-up is over on Bangshift and the Turboforums. It was a great week with some troubles mixed in, but that's how events like this go. Total mileage was just over 1300 miles.

https://bangshift.com/forum/forum/bangshift/project-cars-update/16485-bbr-s-83gt-what-s-old-is-new-back-to-a-bbf/page298#post1339234

https://www.theturboforums.com/threads/the-83gt-back-to-bbf.386025/page-33

Nice. I figured she had some low 12's in her. Love the duct tape and JB, that's "adapt and overcome" at it's finest. Do you remember the shift points of the 12.13 run? I hope the metal pieces are nothing major and a chain tie down might not be a bad idea.

IIRC he was shifting at 5400-5500.

I am going to switch to a different style valve cover (lower and more stockish) for the time being and I also have a turnbuckle I can install as a limiter.

It would seem like she has some high 11's in her in cooler weather and slicks like you mentioned about traction.

I am still trying to wrap my head around that 12.35@112 from a second gear start. You should try to duplicate that next chance. It would seem if it proves out you might get away with a taller gear.

The times of car #66 on you ticket are interesting also. I would "assume" he spun off the line or pedaled it? If not he really turned it on past the 330".

I would put these valve covers and tell everybody it's a boat motor.

https://www.ebay.com/itm/334881660499?hash=item4df8809e53:g:~kYAAOSwPgFkakKr&amdata=enc%3AAQAIAAAA0I0s%2FTJ9jkEKNQVsr%2FYRMkpvaF2%2F1VA6rZ8fjmg5cfwtAc7WIRsf%2FJDeT47AHXz5ahUy3MPSSOkNJl3%2FFpKz%2BH8zSpL0kdzpWSZfrl51nu8G5LdTZPlzC38axA5%2F6pa4iMDlaMarYoSKfzG5huYTzB%2FaOqRrGPX%2BXY%2Bq4yiZRgyKpja4szgXUSoMSauVMScB6wRD1z5IZ3SbjPy5DNPmOPJeZQSmqLmNC0vJGPuo2l%2F1aK93r9khsEHbPq1Q3fuUjswiNyCRhs9ANSTwpPQyBvc%3D%7Ctkp%3ABk9SR4aQjvqkYg

Glad you had a good Independence Day Weekend.

#66 was a GTR. Kinda slow off the line, then goes full jetcar status down track. Haha.

The second gear start pass is funny because it seemed to leave slow, but then ran basically the same ET as it did when launching in 1st with the momentary tire spin it always did.