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81 fairmont -new project LSX turbo

 
Old 12-12-2017, 10:44 PM
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yikes i dont know. 12s maybe? stock converter will really hold it back. but it's good tire destroying fun nonetheless
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Old 01-10-2018, 09:21 PM
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Your car is a twin to mine. Love it, keep up the good work.
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Old 01-12-2018, 07:06 AM
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Originally Posted by MrPotatoeHead View Post
Your car is a twin to mine. Love it, keep up the good work.
Nice, your looks in a little better shape than mine! same 10 hole wheels as well, very nice.

I should be getting a first track pass tomorrow. I'm not expecting anything earth shattering with the 3.08 gear.... we will see
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Old 01-14-2018, 04:45 PM
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We made two full 1/4 mile passes. Best shot was an 11.9 at 122mph 2.2 60ft running 8lbs of boost with the 3.08 rear gear. I had circle D spec this converter but it would not build any boost on the line at all, I was really disappointed. It is way too tight.

I need to go to a manual steering setup and get the converter figured put and it will be ready to turn up the boost.

with all said and done im happy the car broke into the 11s with no 60ft and baby boost. So theres still some more left in it. Hah
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Old 01-14-2018, 05:55 PM
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i like that mph! tons left in it. I leave timing in it until like 5 psi and then start pulling at 8 and down to my 11* or what have you at my target boost/rpm

you're foot braking an 80e right? maybe try the sloppy trans brake thing. it forces 3 gear so the engine has less mechanical advantage over the brakes. let of the same time you let off the brakes and it drops to 1st. kinda bumps the tires too.

but that is damn good man, congrats!
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Old 01-14-2018, 07:47 PM
  #106  
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Yeah, don't shoot Circle D just yet. Some tuning and combo tweaking will get the engine making more power which will get that converter in it's sweet spot. Like Doug said, 122mph shows good potential! Rarely does a combo run right at it's optimum first time out.
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Old 01-15-2018, 06:43 AM
  #107  
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as soon as the converter would come up out of vaccum the tires would spin. (i'm still using the tiny factory brakes...might be one of the issues hah)

see video below: any comments/suggestions are appreciated! thanks for the help guys


Last edited by 68roadrunner; 01-15-2018 at 06:51 AM.
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Old 01-15-2018, 09:22 AM
  #108  
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I had the same issue with my LTD and PTC converter with the 4L80. I never could get it to work correctly until I went to a D3 brake. You could ask Redrocket I think is his s/n, he had good success with the footbrake and 80e.
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Old 01-15-2018, 09:48 AM
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Great setup! 3rd gear “sloppy mod” helps a ton as mentioned, but you need the rears to have some healthy initial grabbing power.

What pads are you running? You want the cheapie organic parts store crap on the rears. “Soft” pads have more initial grabbing power. Also burnouts without a line lock glaze the crap out of the pads and discs. You lose a ton of holding power that way.

Extend the length of your brake pedal as much as you can and really standing on it does more than you’d think. Also ensure you are getting a lot of vacuum to the booster. We’ve even gone as far as running a big vacuum pump with the booster. Brake proportioning valve helps as well, but can be dangerous if you forget or add too much rear bias.

Even a DIY stock dual rear caliper setup is cheaper/easier than a trans-brake on a 4L80E IMO.

Good luck! That’s 10 sec MPH…
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Old 01-15-2018, 10:39 PM
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I am running all stock rockauto.com brakes. I also tried to brake boost it in the pits before the burnout and it was the same problem. Yes it it an 80e.

I called circle D and they told me i need a preasure regulator (see link below) and they said its a common issue with the 80E. They told me that there is no way the converter i have is too tight. Supposedly i need to install this part in the trans. Would really suck to pull the trans out....its a shame it runs great other than building boost on the line.
Amazon Amazon

I would like to avoid the sloppy spool mod, but may have to do it as a last resort.id prefer to simply foot brake.

Last edited by 68roadrunner; 01-15-2018 at 11:23 PM.
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Old 01-16-2018, 06:13 AM
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huh i thought the HD2 kit mods to the pump prevented the problems that kit is to solve?
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Old 01-16-2018, 06:47 AM
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Originally Posted by truckdoug View Post
huh i thought the HD2 kit mods to the pump prevented the problems that kit is to solve?
we did the whole HD2 kit except the pump mod!
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Old 01-16-2018, 07:06 AM
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Had you watched Sloppy Mechanics Youtube videos, you would have know about that pressure valve and pump mod.
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Old 01-16-2018, 08:55 AM
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Yea i did know about it.
I guess when this gen 3 4.8 blows up i will pull everything out and we will do the pump mod. Ive got a gen4 4.8 all ready to go
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Old 01-16-2018, 09:16 AM
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I wouldn’t go tearing into a trans because the converter company missed the converter spec. Stomp the gas from a stop. What kind of stall flash RPM are you seeing? If you don’t see the “rated stall” then it’s not setup correctly and they need to fix it. If they claim you need special valving or other BS to make the converter stall to its rated speed that’s total BS.

A 4.8 is pretty gutless NA and can then make nutty power in boost, so it’s harder to spec. If you can’t hit that same flash RPM from a stop while holding brakes without spinning, you need to address brakes.
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Old 01-16-2018, 12:53 PM
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Originally Posted by Forcefed86 View Post
I wouldnít go tearing into a trans because the converter company missed the converter spec. Stomp the gas from a stop. What kind of stall flash RPM are you seeing? If you donít see the ďrated stallĒ then itís not setup correctly and they need to fix it. If they claim you need special valving or other BS to make the converter stall to its rated speed thatís total BS.

A 4.8 is pretty gutless NA and can then make nutty power in boost, so itís harder to spec. If you canít hit that same flash RPM from a stop while holding brakes without spinning, you need to address brakes.

​​​​​​I forget if he did the 8.8 swap but I think there are great options for explorer discs
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Old 01-16-2018, 01:24 PM
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The explorer brakes aren't the same bolt pattern for the axle flange of a mustang 8.8. I tried a dual caliper SN95 setup on the rear of my ltd with a bracket I had made, but had the same result of not being able to hold the car. I redid the pedal ratio as well. If you did the sloppy transbrake you'd have more mechanical advantage for the crappy brakes.
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Old 01-19-2018, 07:01 AM
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Do the sloppy brake. You won't even need rear brakes at that point. People call it the 3rd gear mod but it technically puts the trans in overdrive (Turns on shift solenoid B while Solenoid A is already on first for first gear = Overdrive). I can build 22 PSI on the footbrake this way, so I had to add a 2-step to limit me to 2800 RPM and 12 PSI. At that RPM, I need less than a quarter of my brake pedal to hold it on the line.

I'll be watching this one for the next couple of months.
I just picked up an 82 Zephyr from a co-worker for $500. Its very low miles and in flawless condition. I'd like to run a 9.99 on a $5000 budget but I might shoot for a 10.99 on about $1500 less.

On a side note, did you ever weigh it?
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Old 01-19-2018, 10:07 AM
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Originally Posted by 408GT View Post
The explorer brakes aren't the same bolt pattern for the axle flange of a mustang 8.8. I tried a dual caliper SN95 setup on the rear of my ltd with a bracket I had made, but had the same result of not being able to hold the car. I redid the pedal ratio as well. If you did the sloppy transbrake you'd have more mechanical advantage for the crappy brakes.
somehow i brainfarted and thought he went to 5 lugs. lol there are like 5 pictures and a video of it with the 4 lug ten holes

my bad
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Old 05-05-2018, 12:38 PM
  #120  
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Well guys Iíve put about 2000-3000 miles on the car. She is running incredible. The posi has gone out in the stock 3.08 fox rear, so Iím going to be swapping in my backup rear with 3.73s.
So the rear end is in the process of being dropped again ( see below)
New traction lock carriers for these 8.8s are 400-500 bucks, seems a bit much for a 100 dollar rear end haha.

the front stock springs were absolutely shot. Iíve swapped them out with a coil over kit 175lb front springs and stock struts.

Hopefully I will head back to the track soon with the sloppy transbrake, will keep you guys posted



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