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LSX454 swapped 95 BASS burb.

Little lower, little cooler, bigger sounds.
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Ironing out some idle issues, and now some transmission hiccups... But she runs good and strong otherwise.
I can tell it's gonna be a BEAST past 4k. Can't friggin wait lol.
I was trying to get a couple different data logs, one soft take off and one hard. And during the hard one it broke free and left short black marks.
:yikes:
:saweet::burnout:.
It's set up to shift at 4k at the moment. So it was brief..... But, .... OH YEAH! Lol.

Those were the first dry ground, non brake assisted, black marks this thing has ever laid.


Idle issue shouldn't be a huge problem. The transmission is buggin me out though.
The transmission was taken out, put on a cart, and pushed to the side. Then put back on the new engine and reinstalled.
Nothing was changed about it or the tune parameters of it.
But it slips a half a second on even a normal soft take off. And shifts softer than it had before.

Normal shifts while moving don't seem to slip, even under load. But almost every take off does.

Which started only after driving it around town a few times.
So it's parked at the moment.
I'm going to change the filter and fluid. Check the pan. Then drain the fluid and rechange it once more after running it a while.

The only thing that changed during this was the fluid.
I had swapped it to Valvoline dex6 before the engine swap, and all was fine.
When I went to put it all back together I noticed I had 2 jugs of O'Rileys dex6 in my cabinet.
One unopened, and one opened partial.
I used those. And that was the only difference.
I don't know why I had those, or how long they'd been in there. Plus, can only imagine and hope that the open one actually contained new dex6.

When pouring them in, they both looked new and I seen no signs otherwise. But I'm changing it as a precaution, and because I know the Valvoline didn't slip.
 
Don't know? I don't have any way to test that.
I know I didn't change my pressure valve duty cycle at all, and it used to bang shift and chirp tires at low acceleration even. It acts low on fluid, but the fluid level is good. Complete mystery to me at this point.
 
It's apparently an actual slip seen in the sensors on a datalog.
It's an odd one. Kind of like an oil filter wrench. It's slips just a bit and grabs hard.
It's not a slip as in just revving up a bit before it moves. You can physically feel it trying to grab, but not quite.
Almost like there's a touch of oil in the trans fluid.

Beings that one bottle was open, and I don't know why it was in there, I'm not ruling it out.
Which is why I'm changing the fluid twice and the filter for the fork of it

Only other thing I wondered is something wrong with the electrical plug. Maybe not making the right contact in places... :dunno:

I was also wrong on one thing.
Something else did change. I changed the speed sensors in the side of the trans while it was out.
 
shady said:
It's apparently an actual slip seen in the sensors on a datalog.
It's an odd one. Kind of like an oil filter wrench. It's slips just a bit and grabs hard.
It's not a slip as in just revving up a bit before it moves. You can physically feel it trying to grab, but not quite.
Almost like there's a touch of oil in the trans fluid.

Beings that one bottle was open, and I don't know why it was in there, I'm not ruling it out.
Which is why I'm changing the fluid twice and the filter for the fork of it

Only other thing I wondered is something wrong with the electrical plug. Maybe not making the right contact in places... :dunno:

I was also wrong on one thing.
Something else did change. I changed the speed sensors in the side of the trans while it was out.
Click to expand...

And the shifter changed...triple check the shifter adjustment, for each detent. Its common to need to readjust after initial use.

Also, change the trans filter, use a good one, a junky filter can cause major problems.
 
Wix only for me.
Should have that done and the detent checked Saturday.
And yeah, the slip started after a few drives.
 
Well. This don't leave me with happy thoughts :notworthy:

NEW fluid with about 100 miles on it.
The stuff I drove on after the trans rebuild up till the engine came out looked new yet.
So it's not because of mixing with old.

I checked my shifter linkage, and it's dead on. So that's not it.
I hope I didn't shell this f**ker, but there's a LOT of glitter in there.

IMG_20250517_120035237.jpg

IMG_20250517_115933828.jpg
 
Pressures raised, and new fluid/filter. It doesn't seem to slip on takeoff now. And shifts are hard.

Now if it stays that way, sweet.

Just gotta figure out some tune chit now.
 
I'm going to swap the fluid one more time.
Just for the fork of it cause it smelt burnt.

I have a drain plug in the pan so I'll just drop it and refill.
 
Debating just going on a big ass drive tomorrow to get the miles needed on this.

I have right at 100 ish on it now.
I have a cousin I haven't visited in a while that lives 90 miles away. All 2 lane with hills and corners. Figured out and back would help get me closer and good variance for seating the rings.
 
Didn't get the drive I wanted in, but we drove it 50 miles around some back county roads. Running great. And was doing fine in stop and go a few times.
Getting closer to hammer time :woot:
 
I have the LSX454 in my race car and it's really good. Once you get to open it up you'll really giggle. My buddy with a sister car to mine with a 800hp 430 got a kick out of the torque from the 454 even though it doesn't have the legs his did. The power is good but not amazing in race car land but the torque is really good. I got about 440hp on a hub dyno through a TH400, atlas t-case and a high pinion 9" rear. Same intake as you and1 7/8" headers (kind of mid-long length to fit the chassis) but with a dry sump that'll help power a little compared to a wet sump.

If you find this isn't enough as is (not likely!), FTA and Klein are working with GM on an endurance racing version that'll essentially add a head porting job and camshaft to this 454 and bump it roughly 100hp while still being a long term durable pump gas engine. Pretty awesome engines. Not necessarily cheap but a really good value.
 
I have it set up to shift at 4k right now. And even at that, it's been an impressive beast so far lol.
Being 6700#, it's just always felt sluggish, no matter what the engine sounded like it was doing.
Now, it feels like a Camaro almost lol. Last night I went for a cruise to get miles on it, figured I'd play around a little in my idle to 4k available range.
On a straight away coming out of a corner at 48 in third gear I pushed the pedal to half real quick, glanced down and was already doing 80 :yikes:

OMG, I felt like a kid again lol.
I'm taking it on another 100+ mile round trip today, and as of tonight I'll have 450 miles on it ....
That's close enough :thumb:
It'll get an oil change, and one more trans fluid drop to get more of the old out tonight when I get home.

Tomorrow the shift points are going to 5500.

When I get another 500 on it I'll change oil one more time. Then they go to 6300 lol
 
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