speedtigger

iTrader: (16)

No doubt. I would get a new baseline with your new combo and go from there.

As for staging, most converter/combos have a sweet spot for the best 60'. Mine produces the best 60' when torqued up to about 1800-1900 at the line. There are some generalizations, but trial and error will reveal the sweet spot.

thunderstruck507

iTrader: (18)

Just an update since this has been brought up in my track times thread again.

New combo is same as old but with mildly worked heads and an EPS 230/238 cam and supporting things like 85mm MAF and bigger injectors. Also a fresh tune with lots of street time and timing adjustments at the track. I also have switched to a 275/50r15 MT tire and weighed the car.

The car weighs 3500# with a full tank. I race with 1/4 tank and I only weigh 135-140lbs.

I also made it onto a track with some killer prep and tried various launch RPMs. It was dead hooking any launch type I could throw at it and the best 60ft of the day was a 1.72

I tried from idle, from 1500rpm, and higher up until I was launching with it stalled all the way to the point of trying to push the car.

Any thoughts as to whether it should be leaving a little harder on this converter with this combo? Just doesn't seem it has any hope of going past my previous best of 1.68 since so far I can't even match that

Killer5.3

iTrader: (1)

You need more gear with that cam especially in a heavy car like yours. Our car is 3500 lbs with driver and cuts 1.59 -1.60 60 ft with a Yank SS3600. MS3 cam , 4.11 gears, 275/60/15 MT drag radial or 28/ 10.5 slick doesn't matter , same times. Front suspesnion is bones stock and rear has everthing done, LCA, Torque arm, Anti Roll, Da shocks etc. I think a swap to 3.73 at least would knock yousr down in the low 1.6. Ours does better leaving around 1500-2000 footbraking.

pancho toco loco

iTrader: (8)

+1 on more gear. I'd go 4.11's. How's the weight transfer on launch?

stumprrp

iTrader: (2)

One of my older cars had an ss3600 with 3.73 gear, cam only with about 350 RWHP unlocked. 3460 race weight, bone stock suspension. The best i could muster was a 1.69 dead hooking on 255 DRs. I found that converter pretty tight. The 4000 vig in my old LT1 stroker at almost 3800 pounds did a 1.60 pulling the drivers side tire.

thunderstruck507

iTrader: (18)

I'm kinda leaning toward being in the same boat as you stumprrp. After going from a taller tire to the shorter one and still not being able to even match the 60ft achieved on the taller tire...I really don't think throwing a small amount more gear is going to help much of anything.

The switch from 3.42 to 3.73 in an automatic is almost negligible and anything steeper ruins the car as a street car.

Guess I just need to consider having Yank go through the converter the next time the car is down.

RonSSNova

iTrader: (3)

Have you logged your runs with HPT? Any tire spin will show up in the mph plot. You can also pretty much see where the converter actually stalls.
You will also be able to see a lot of what is going on in the tune when you mash the throttle.
Do you have trans abuse disabled? Torque management tuned out?

My C5 60fts around 1.6 when the track is good which is rare.......and I think I'm off be over a tenth. My car is only about 100lbs lighter than yours, also with a 3.42 gear. I do use a 26" drag radial.

Ron (AKA Ron454 on the TC site)

CamaroRacing12

iTrader: (5)

Bolt on only LT1 3150lbs raceweight 1.635 60ft with BONE STOCK suspension. with the yank SS3600

stumprrp

iTrader: (2)

Key words in bold

speedtigger

iTrader: (16)

I really thought I would see a lot more posts in this thread from people with high 1.5 to low 1.6 60 foot times.

lemons12

iTrader: (71)

That converter is right on with my buddies 3600 yank.. You guys have similar rwhp and weight as well. Running very similar times..

Id switch to a Ptc if i were you... That converter should be creeping up to the 1.5x range. 1.6s should be a given.

lemons12

iTrader: (71)

37xrwhp.. 4000 ptc.. 3500raceweight..

I was cutting 1.50-1.52s barely spinning with a nitrous tune, 2000+da. 7.2-7.3s@95+

LeanPocket

iTrader: (6)

sounds like you need to tweak the converter a little bit after everything i read, that and sounds like a weight transfer issue aswell

thunderstruck507

iTrader: (18)

I've ridden in a cammed ls1 with a Vigilante 4000 and while it was badass on the hit, the town manners sucked hard. That car is why I waited so long to buy a converter at all.

But I guess I can't have my cake and eat it too. Just need to find that compromise area of 60ft and decent street manners. Not opposed to it being a little looser, but that Vig felt like the trans was going to burn up and I hated even riding in the car...especially if we hit a hill and there are a LOT of hills around here.

EDIT to fix company confusion

stumprrp

iTrader: (2)

Yeah when i restalled the vig in my camaro i went up "two steps". Thats how they explained it to me on the phone. Each step was 4-500 RPM. In reality i should of did 1 step which would of made it a 34-3500 instead of a 4000. The 4000 was very loose around town. Regular driving was 2200-2500 and hills were 3000. Believe it or not my dyno numbers did really take a hit so i guess the efficiency stayed the same.

I think the best bet is a custom converter. Ive heard many testimonials from circle-d customers that they stay tight driving around town and still flash to whatever desired RPM you want.

LeanPocket

iTrader: (6)

I think that would be best.
I would give FTI a call, they have alot of record setting cars using their converters, and gregg will dial in that stall for you to your liking.

https://ls1tech.com/forums/automatic...onverters.html

lemons12

iTrader: (71)

Ptc put of Alabama?

That is literally the first and only time i have heard someone complain or not be 100% happy with their converter if so. That is definitely an isolated incident and not the norm.

thunderstruck507

iTrader: (18)

Edited my post I was mistaken, I thought PTC was the company who makes the Vigilante converters. My experience was with a vigilante 4000, of which I was not a fan at all.

When it comes time I guess I will weigh options between restalling my Yank, PTC, Circle D, and FTI.

01ssreda4

iTrader: (96)

Please slap yourself in the face repeatedly. When talking about converters it always seems to bring out the know it alls who actually know nothing. Each manufacturer discussed in this thread, PTC Yank Circle D, Vig, FTI, all give you specific converter internals based on your specific combo. None of them simply pull a converter off a shelf that's labeled as: LS1, 4k stall speed. Doesn't work like that and never has. Insinuating that that's how these other companies do business is f-ing retarded.

stumprrp

iTrader: (2)

What the hell did i say? He needs a CUSTOM CONVERTER. AKA what you just said, he gives them the specs and they build it. All i mentioned was some testimonials from circle-d customers that were impressed with the street manners.