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Old Apr-09-17, 12:36 AM   #1

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Default 402/4l80 dyno

Wife's blazer made 480/500 in the dyno today

Fast 102 combo
Ported stock valve 243's
235/242 cam
Compression around 11.3:1
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Old Apr-09-17, 05:13 AM   #2
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Old Apr-09-17, 06:04 PM   #3
 
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Great Numbers!
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Old Apr-13-17, 09:11 AM   #4
 
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Im guessing DynoJet with those numbers? Maybe, if not excellent numbers for sure
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Old Apr-13-17, 10:04 PM   #5

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It was a dynocon I think it said. Probabaly close to a dyno jet.
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Old Apr-14-17, 02:10 AM   #6
 
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Nice! Stock bottom end? Wish we coulda seen below 3500 rpms though.
Any plans to see what it run at the track?
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Old Apr-16-17, 05:33 PM   #7

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It's a 402 with a 4l80. Poor thing actually feels like a horrible turd. People keep telling me it's because of the trans but with that much TQ and a 3600 stall it should at least spin the tires some
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Old Apr-16-17, 06:19 PM   #8
 
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Duh... Just saw the thread title lol.

I noticed mine feel a little more sluggish too when I did my 80 swap too... Was thinking 4.56s would take Care of that lol...
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Old Apr-17-17, 05:46 AM   #9

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Quote:
Originally Posted by Pwebbz28 View Post
It's a 402 with a 4l80. Poor thing actually feels like a horrible turd. People keep telling me it's because of the trans but with that much TQ and a 3600 stall it should at least spin the tires some
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Originally Posted by Pyroproblem View Post
Duh... Just saw the thread title lol.

I noticed mine feel a little more sluggish too when I did my 80 swap too... Was thinking 4.56s would take Care of that lol...
I don't have an 80e so I'm not speaking from experience here, but I would definitely agree with those who have been telling you it's the transmission.

The gears in the 4L80E are significantly "higher" than the 4L70E, specifically 1st and 2nd.

4L70E Gear Ratios
1st = 3.07
2nd = 1.63
3rd = 1
4th = 0.70

4L80E Gear Ratios
1st = 2.48
2nd = 1.48
3rd = 1
4th 0.75

Going from the 3.07 1st gear in the 4L70E to the 2.48 1st gear in the 4L80E is why it "feels like a turd..." and "feels slower since I swapped to the 80e..."

With so many TBSS swapping to the 80e I'm surprised there aren't more people swapping out their gear ratios specifically for 1st and 2nd gears, because there are lower gears available. Probably because swapping to the 80e is such an expensive project as it is and the lower gear ratios are a decent investment in themselves.
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Old Apr-17-17, 12:27 PM   #10
 
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I wish I had known about lower 1st and 2nd gears available when I had my 80 rebuilt..
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Old Apr-28-17, 12:35 AM   #11

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I didn't figure it would be too bad down low with it being a 402 instead of stock cubes. Converter is WAY too tight (2500 is all I can get out of it with the pedal on the floorboard) and I personally think the cam is too big. More of a corvette cam. I have a 218/230 cam sitting in my closet so I'm contemplating using that and see what happens
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Old Apr-28-17, 05:51 AM   #12

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Like I said they're pretty pricey, you're adding $900-$1,100 to your 4L80e trans build just to upgrade your 1st and 2nd gear ratios.

https://www.summitracing.com/parts/t...FQcdaQodnOsNpQ

https://www.summitracing.com/parts/tci-279700/overview/
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Old Apr-28-17, 09:33 AM   #13

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Price doesn't matter. Already have $4k in it with converter. Problem is the gearing is weaker if I'm not mistaken.
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Old Apr-28-17, 02:53 PM   #14
 
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Are those gearsets not proven to be reliable?
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Old Apr-28-17, 03:14 PM   #15
 
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I was planning on changing the gears as well, but seems we can't.

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Old Apr-28-17, 09:49 PM   #16
 
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I'm surprised, I thought I've seen different gearing available for the 80E.

I have different gearing in my 70E, 1st is 2.84 and 2nd is 1.56 if I remember right....
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Old Apr-28-17, 10:04 PM   #17
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Is that because the early 80s didn't have iss?

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Old Apr-29-17, 06:01 AM   #18
 
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Quote:
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Is that because the early 80s didn't have iss?

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I'm no transmission guy, so I don't know. I did find this though.

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Old Apr-29-17, 10:16 AM   #19
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I know mine is going to feel gutless. 80 with a smaller stall is going to kill mine

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Old May-02-17, 09:43 AM   #20
 
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so if swapping out the 1st and 2nd gears is not possible. what other changes can be made to make it not so sluggish in 1st and 2nd gear?
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