Hank Peabody

iTrader: (2)

I shift at 6000rpm, my peak torque is probably 4000-4500. My converter couples at 5300 minimum and the shift from 2-3 the rpm only fell to 5700. The car sounds like a snowmobile going down track. Im hoping going to a much tighter converter will pick up more mph or else Im not making much power for my combo. Has anyone seen their car pick up mph with a tighter converter?

Pro Stock John

iTrader: (34)

What does it run at the track? Have you tried shifting higher, 6000 sounds low to me.

rotary1307cc

iTrader: (5)

wow your are running a ton of gear.

and not spinning it very high which would help with coupling

what does it run? i am very curious because i just about stuck 2.73s in my car but was scared too. haha

i have a similar setup but with a glide and 3.08s, i shift at 6700 and on the transition will drop to 5500-5600. also when i come hard into boost no matter rolling or stopped it will flash to around 5500 and go from there

Hank Peabody

iTrader: (2)

I only have two time slips on it, first at 7# was 6.9@107, the second only got one pass that day and was 6.6@110 at 7.5#. 60' was 1.7 and 1.6 respectively. First pass I wasnt full throttle until half way. But I figured it would be alot closer to 115mph on 7# as light as the car is. The 2.41 gear and th350 (1st and 2nd) make it about the equivalent of running a powerglide and 3.73 gear.

My 60' are terrible so far, I have to work on that, but I feel like Im either not making the power I should be or the converter is the problem with my mph. Im putting a tighter converter in now, just wondering what others have seen in this situation.

Thanks

6point7s14

iTrader: (3)

U might try tractor fluid first

rotary1307cc

iTrader: (5)

how heavy?

87silverbullet

iTrader: (11)

Are you foot braking the car? If so how high can you get it to stall to get boost?

ls1curt

iTrader: (31)

I went from 147 to 156mph with just a converter change. Also picked up 100+hp/tq

drumbo87

iTrader: (4)

not to hijack....... ls1curt what brand/style converter are you running?

Hank Peabody

iTrader: (2)

Thats whats in it, JD Hyguard, thanks for the idea.

I think about 2600# with me in it, not 100% sure.

Yes foot braking. It stalls right around 3000, but will climb up to 4000 after a few seconds, brakes barely hold it there.

Did you have the same type of loose converter at first and went to a tighter one?

Thanks

Pro Stock John

iTrader: (34)

Maybe you are leaving info out, but why would you change the converter before getting a couple of good hits out of it? I wouldn't change a single thing until I had like 7-8 full good passes out of the current combo. What will the rpms go up to on the 'brake without a 2 step engaged?

And I'd be trying in those 7-8 full passes a few different shift points.... 5800, then 6100, 6300, 6500... 6700... Or has it been dynoed? What intake?

ls1curt

iTrader: (31)

Yank 11" py3400

Hank Peabody

iTrader: (2)

This is 99% a street car, I cruise it on the freeway alot, I dont like the fact I can be cruising on the freeway at 2000rpm in 3rd gear, then floor it, and the engine goes to 5300rpm and sits there.

rotary1307cc

iTrader: (5)

i dunno man i wouldnt get too crazy about changing right away

my converter acts the same as yours

if i am going down the road in high gear at 2000rpm and go WOT it will flash to the exact same area as yours (5.3-5.5k) as boost comes which is almost instantly

yet it still drives around nice and tight putt putt and cruising down the highway, on the transbrake i can come to however much boost i want withing 2 seconds

at the track it is right in the 6% slip area as it crosses the line (1/4)

mph seems alright for stock heads at that boost for a little turbine, what turbine are you actually using

have you figured your rough slip? how high of rpm do you cross the line at, and what mph and tire height?

Hank Peabody

iTrader: (2)

75mm turbine, same turbo as yours except 76 billet wheel. Going across 1/8th mile in 2nd gear at 6100rpm it was about 18% slip, I think if I was 6500 or 7000rpm the slip would be alot less.

rotary1307cc

iTrader: (5)

yeah that it quite a bit

spinning it higher should couple it better but i wouldnt think that much

are you running a 10" converter? i am running a 10" ptc

i wasnt sure if you were running an older small turbine or the gts, that should be right happy

Pro Stock John

iTrader: (34)

Is it a 8" or 9" converter? Sounds pretty loose for your combo. PTC was really good with Andy (moderator lastls1) when he had his tightened, maybe ask Lane over at PTC what he could do for you.

Hank Peabody

iTrader: (2)

It is a 10". PTC is great, I dealt with Tim, they are really nice to deal with, they swapped it out for a tighter converter more toward being tighter on the freeway. I think if I was wanting max ET(like 99% of their customers), running more gear and more rpm this converter would be perfect, its just kind of a bizarre setup compared to others I think and I didnt realize it when I ordered the converter.

rotary1307cc

iTrader: (5)

let us know how it works out!

have any pics of the ride?

i do like the idea of the deep gearing with a 3 speed and effectively having an PG with OD

but i already had the pg when i pondered such a thing

hope it works out, will be a sweet street/strip combo

71 chevy

iTrader: (18)

i have a buddy who swapped out his converter from one with 26% slip at the eighth to 14% slip at the eighth

before. 6.25 at 111
after 6.50 at 109

with nitrous before 5.80 at 123
with nitrous after 5.80 at 123