replace accumulator or get a tune? - TCCoA Forums
 
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post #1 of 5 (permalink) Old 06-27-2014, 11:02 AM Thread Starter
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replace accumulator or get a tune?

Hey guys, got a question.

Just picked up a 94 t-bird with the 4r70w. The kid I got it from said he had 3.73's with an LSD installed, but it never got a tune to fix the shift points. I don't have any experience with this situation... But I have driven a car with a broken 1-2 accumulator and this feels oddly similar.

My question is this, what would it drive like if it needed to be tuned? Im consistently getting that first shift around 3k, barely touches 2nd gear, directly to 3rd. Easiest way to explain it:
1111111111111111111111(3k rpm)22233333333333444444444

Any insight?

Second, where is the best place to purchase the updated accumulator? Is this something I need to get from the dealership?

Thanks in advance!
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post #2 of 5 (permalink) Old 06-27-2014, 11:48 AM
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To answer the thread title question... both. Do the J-mod if you want to try to get as much out of the remaining life in the 94 trans, and get a tune to take advantage of the mechanical changes.

A couple things here related to your situation. First, the computer - if the correct speedometer gear was installed to adjust for the change in rear gear ratio - can compensate for the change in gearing. Technically, up to a 20% change either direction from stock can be compensated for; if the car came with a 3.27 stock, you're fine in that regard. If however, the car came with a 3.08, you will need a tune. The car would consistently shift at a relatively 'low' vehicle speed or RPM. Around town shift points are primarily controlled by throttle/pedal position vs. vehicle speed.

The J-mod is used in conjunction with gear changes because it reduces the clutch fill times and thus the time it takes between when a shift is commanded and when a shift is completed. Because a shorter gear causes the RPM to rise at a higher rate and the PCM commands the shift at the same RPM, you might hit the rev limiter because the shift 'takes more RPM' to complete. Doing the J-mod to reduce shift completion times brings the RPM change back down.

Now - as for your situation... a leaking 1-2 accumulator o-ring seal will cause a late 1-2 shift, no 1-2 shift, and/or a shudder on the 1-2 shift. On the other hand, a failing intermediate one-way clutch will cause a late 1-2 shift that finishes with a 'bang'.

That said... to me it sounds like a more likely to be the one way clutch than the accumulator, but then again, I'm not riding in the car with you when it happens.

If you plan on keeping the car for any length of time, money would be best spent on a 99+ transmission swap.

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
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post #3 of 5 (permalink) Old 06-27-2014, 12:01 PM Thread Starter
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Yea, I plan on the jmod while assessing the accumulator situation. It doesn't shift with a bang, my last bird had a bad clutch and I know that feeling. It shifts normally, just late.

The swap will be in the future, I'd like to get as much out of this one as I can. To the point where I might swap down in gearing just to eliminate the need for a costly tune. I need to go check the axle code, might just swap out the rear for 3.27 and do the jmod, update the accumulator, and see where I'm at from there.

Any input on where to get the accumulator?

Thanks for the info sir
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post #4 of 5 (permalink) Old 06-27-2014, 12:17 PM
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Send a PM to FordPartsCounter here on the boards, that's where I get factory parts from when I need them.

I actually have a new, sealed, updated design Ford 1-2 accumulator and retainer cover I don't need that I'll sell...

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
98 Black Mark VIII 160k, stock daily driver
07 Redfire Fusion V6 SEL 178k, for the wife
Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII

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Once you have tasted flight, you will walk the world with your eyes turned skyward, for there you have been and there you long to return. -Leonardo da Vinci
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post #5 of 5 (permalink) Old 07-06-2014, 09:12 AM
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If that's an original 94 4r70w w/no Mech Diode it's gonna blow all to hell any day now so I would'nt spend a nickel on it.

GET OFF MY LAWN~! ... & Let's not forget guys... There's still a dead Imaginary Ex-Girlfriend out there...
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