Photochop

iTrader: (74)

Finally got the car to the dyno to see how much power it lost from going to the 4L80 from the factory 6 speed.

The new setup is a '95 model 4L80 with a forward manual valvebody (transgo stage 3), Fuddle 3200 converter I got from Cablebandit on here and stock 3.23 10 bolt rearend. The previous setup made 616/634 with a 16psi boost spike at peak torque, and 13.5psi at peak hp, through a Spec 4i clutch and a Moser 12 bolt with 3.73s.

Engine combo is a bored LS6 block (348), Diamond forged pistons, forged Eagle rods, stock crank. Stock 853 heads with comp 918s, cam is a Lingenfelter GT7 (208/230 .547/.579 121LSA), stock LS1 intake, stock TB, 2 bar SD tuned. Log style drivers side manifold, stock passenger manifold with a rearward crossover (similar to a TTi street or ebay kit). Retains A/C, the cars completely daily driveable.

After some minor tweaking with the tune, it ended up making 485/480 through the unlocked converter with 12.6psi of boost....2psi less than what it saw with the 6 speed at peak hp. We just made 2 pulls, starting both at about 3700rpm to avoid excessive converter spike on the torque reading. I was in a hurry to avoid a storm that was heading our way (had to drive home on pretty worn 315 MT radials), and didn't really spend the time to tweak the boost controller for a little more power. So, the car 'lost' about 100rwhp over the M6 setup...but I'm not too upset, it feels faster to me with the auto now and I can't wait to see how much it helped at the track!

Heres a mediocre video from my iphone of the dyno...

Patrick G

iTrader: (14)

Glad you're happy, but I see a more efficient torque converter in your future.

Photochop

iTrader: (74)

Yeah...I figured it would lose quite a bit compared to the newer triple disc units available. Cablebandit was kind enough to give me a hell of a deal on this one, and it'll get me by til I get more serious with a bigger turbo on this kit.

cjmatt

iTrader: (4)

did you run it with the converter locked?

Photochop

iTrader: (74)

No, unlocked for both pulls. I don't plan on locking it up at WOT...its just a single disc converter. Cablebandit told me that he attempted to do this with about 100 more rwhp than what I'm making and it wouldnt hold lockup. I don't have the desire to change it at the moment, just wanna enjoy the car since its been down for so long. I know this one isnt ideal and there probably alot left on the table, but for what the combo is I'm pretty happy with it. The track will be fun regardless.

chrs1313

iTrader: (24)

can I ask why fuddle?

gt35built

iTrader: (1)

And why the stock intake?

Lythropus

iTrader: (13)

I'd really like to see some quarter mile times, these numbers seem real deceptive. Granted you're turning a stalled 4l80E but then again you have a 6 speed and a 323 geared 10 bolt so it still seems weak at 12lbs...I dunno just a little confusing...

Photochop

iTrader: (74)

I didn't have the budget in the swap to do a $1k converter at the time, so this used Fuddle that I paid considerably less for that worked for another reputable forum member with similar power, so why not let it work for me?

I bought the car a little over a year ago with the shortblock setup thats in it currently. The only things I've done with the car so far have been the 4L80 swap and a retune.

Sorry if the original post wasn't easier to make sense of.

Bought the car with a factory 6 speed, spec 4i clutch, 12 bolt with 3.73s. Car dynos 616rwhp/634rwtq. You have to keep in mind that the exhaust wheel and housing in the T70 is very small...restriction #1. Other 2 big restrictions are the ls1 intake and stock 853 heads. It makes peak hp at 5400 for God's sake! lol

Sold 6 speed, spec clutch and 12 bolt. Bought/installed 4L80, Fuddle converter, BMR 4L80 relocation crossmember, 3.23 stock 10 bolt.

Its seeing less boost because its a manual controller thats on it that may have gotten bumped or moved slightly when working around the car. When the car was dynoed with the new setup, we didn't take the time to play with the controller because we felt this power level would suffice for a couple of passes at the track just to see where its at. The car feels stout, faster than it did with the 6 speed. I'd heard that the typical unlocked th400 swap will usually show a loss of around 75-100rwhp on the dyno when compared to 6 speed numbers...so to me its on the money when you add an extra 30-40rwhp or so for the 2 psi of boost its not seeing currently. When I get the car to the track in the next month or so I'll post up results with how it does.

smok'nZ

iTrader: (160)

im glad it feels faster with this weather we have been having it should run well at night.

chrs1313

iTrader: (24)

They have been known to rob power, less MPH on the topend...Good luck hope you got a good one...

LIL SS

iTrader: (9)

If it helps any, I have been running a Fuddle in my 63 pick up for a few years (4L80E also). Are there better verters out there, probably, but, I do lock mine up while running. My little 347ci motor makes 402rwhp/324ftlbs unlocked NA and I have run a 100 hit (52n jet @ 900psi) also locked halfway through second and all of third. With the 100 hit we should be similar in power.

Is the Fuddle inefficient... Slightly. Locked NA I make 449rwhp/372ftlbs.. loss of 47rwhp and 48ftlbs.

Mine flashed to 4,500.

Engine_HP

iTrader: (1)

why the huge -23 of overlap are u sure ur LSA is 121 and not 112 ?

chrs1313

iTrader: (24)

wow that is a ton...so for $300 more vs the fuddle you can pick up some serious hp/mph...

jimbob

iTrader: (4)

I know you tried to compensate for the lack of "2" psi in your loss calculations, but the rear end swap also netted you another 12-15 rwhp over the 12 bolt. So, your loss is more like 115 rwhp. That number is way out of line for 30-35 rwhp loss of the tranny alone install....in other words, your stall is way inefficient in the range you need it to hyd lock the most. I bet your power curve is pretty flat (so you would have a nice average hp). A good tight turbo verter in your rpm range should only be 5% loss. It's not abnormal to restall a Good boost verter several times to get the right combo of flash rpm, ability to boost on the line (more important to me than flash rpm) and upper rpm hold ability. Look for minimum of 550-560 rwhp when your boost is cranked back up and you have a tight verter in their. As a reference...A similar combo...LS6 manifolded, log turboed 76 (TTI), 4l60E, 9inch and unlocked PYE3400 made 615 at 12 psi. That 4l80 only takes an extra 20 or so over a 4l60e so, you should have a better idea of where you should be. My guess is that you will pick up 3-4 tenths and 4-5 mile an hour with the right verter.

SIC LSX

iTrader: (10)

it feels faster because it is faster dont worry about #'s track #'s are all that count

denmah

iTrader: (2)

4l80e dream

gotta love em