New converter

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New converter

Postby raws10 » Wed Oct 04, 2017 11:20 am

Just put a new Hughes pro competion(GM45)4500 stall torque converter in the 383 S10.This thing flashes instantly!!!!!Now I'm having problems coming off the line.I am over the winter putting in a bigger solid flat tappet cam that comes alive at my stall speed.My cam now has a powerband that starts around 2400 rpm.I figure that's the problem right there.So for now one more day of racing on the 15th.I'll probably bleed the air down in the Hoosiers to about 10 psi(!!!!!!) and do a good burnout.Probably come off the line at idle and nail it! oh yeah and put the rim screws back in............The truck is backhalved and has a QA-1 setup.I got the rear down about as far down as I can.I'll try that out too......anyone else running a big converter???
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Re: New converter

Postby lowblazin94 » Wed Oct 04, 2017 12:11 pm

What do you mean flashes instantly? Whats your motor set up?

Are you hitting the tires too hard on launch and spinning? Dead hooking?
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Re: New converter

Postby raws10 » Wed Oct 04, 2017 3:37 pm

Converter shoots to 4500 instantly! It's amazing! It was just blowing the tires off...........I'm in the process of lowering the 4 link a bit and turning down the springs a little.It's sitting a bit lower now.I'll just have to experiment with some different launch techniques till I see what works.............Like I said earlier I'm putting in a solid lifter cam that only starts it's powerband around 4 grand.Shiuld get me off the line quicker.........my cam now starts making power at 2400.
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Re: New converter

Postby lowblazin94 » Wed Oct 04, 2017 5:02 pm

Oh ok I see. For now try foot braking off the line. You are flashing the converter, so instead foot brake and hold the RPM around 3500 if you can and see how it does.

What size tire are you running? I bet once you foot brake and ease in to the tires a little you will get the sling shot launch you are looking for. Wheel speed is good, but you want it to hook at the same time. As long as it goes straight then you are doing better than most. Getting traction is just a matter of trial and error at this point. If you are running a decent size tire then 10psi is a good starting point. Remember these trucks are light and the more tire you have then the more weight you need back there.

I'll spare the friction of rubber talk and make sure you measure PSI after the burn out. Pre burn out PSI can vary depending on air, ground temperature and sun expose. Usually after a burn out is your most consistent and reliable time to gauge tire PSI.
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Re: New converter

Postby raws10 » Wed Oct 04, 2017 5:48 pm

Thanks for the info!!!! I'm running Hoosier Quick Time Pro DOT tires.........31x16.5x15........so I got some rubber under there.............can't wait til next season ...........I'll start tearing down the engine for the new cam soon...hopefully..........send the heads out for new spring pockets........thanks again!
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Re: New converter

Postby lowblazin94 » Wed Oct 04, 2017 7:09 pm

For the rear with a 4 link I highly recommend getting it on 4 corner scales. Get the weight balanced on each tire. Front tires should be dead even and the rears should be dead even with the uppers bars unloaded.

Adjust the weight around and then set the preload on the passenger side around 25lbs to get a baseline and adjust from there for a straight launch.

You can play with rear tire pressure but set the front shocks loose if they're adjustable......whats the front suspension set up anyways?
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Re: New converter

Postby raws10 » Thu Oct 05, 2017 7:56 am

Front suspension is completely stock.................
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Re: New converter

Postby Rickracer » Thu Oct 05, 2017 3:11 pm

If you do the 4 corner weighing, make sure you do it with your weight in the driver's seat, :wink: 8)
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Re: New converter

Postby lowblazin94 » Thu Oct 05, 2017 9:23 pm

raws10 wrote:Front suspension is completely stock.................


What springs are in there? The 4 cyl front springs and Speedway Upper control arms with 3 way adjustable shocks will greatly help. Front suspension plays a major role in traction.
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Re: New converter

Postby XXXXXXXX » Sat Oct 07, 2017 11:52 pm

I had a set of Hoosier quick times on my Monte.. if I remember right.. I had to screw them into the rim and air them down to like 18 or maybe 16.. I would blow them off the back of the Monte on launch but still could 1.4 to 1.6 60' depending on track prep. For me it turned out to be an advantage coming off the line cause the car liked the high rpms in 1st.

X
82 S10 Longbed.. stock 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. dyno'd 194rwhp...holley 750dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.73 posi fact s10 disc brake rear end.. caltracs.. 275/60/15 Nitto Extreme 555 drag radials
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Re: New converter

Postby raws10 » Wed Oct 11, 2017 8:10 am

I lowered the rear a bit and put on rim screws.Oh btw I have the Quick Time dot tires with just the 2 grooves in them.Going to take them down to about 12 psi and see what happens.Or maybe lower.lol.Over the winter I'm going with a bigger cam to compliment this new converter.4500 stall.The cam that I have now starts making power at 2400..........I think that's the traction problem.My old converter was a 3000 stall and it was better with this cam.I wanted to upgrade anyway so we'll see how it goes.....thanks to all for the advice!
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Re: New converter

Postby XXXXXXXX » Thu Oct 12, 2017 1:42 pm

Those were the tires I had.. IIRC when I aired mine down that low.. the tires got too mushy to drive on... too much side wall flex..
with a 4 link.. I would look toward set up of the suspension.. keep in mind there are s10s out there with 8' tires.. caltracs.. stock springs.. hook and run in the 9's. So I fought mine forever.. after hours and hours and hours and hours of suspension tuning I finally got it. Each set up is different.. in my case I needed more power / torque to the rear which should not be your issue... so to summarize.. my solution was to go from 3.42 gears to 3.73.. as soon as I went to 3.73 I hooked.. my set up / caltracs wanted more torque or power.. see my sig for hp info.. any way .. the point is.. each set up is different and it takes a lot of time to get it right.. Just keep in mine what I posted above.. if guys can get s10's into the 9's and hook with basicly stock suspension and an 8" tire.. we all can too. I would look at all the variables of your 4 link set up and make 1 change at a time and test.

X
82 S10 Longbed.. stock 305.. b&m 144 blower.. 7lbs.. stock 801 heads.. dyno'd 194rwhp...holley 750dp.. percys adjust a jet in the front & rear.. headman 1 1/2 shorty headers.. 2 1/4 dual exhaust with hooker aero chambers.. msd with boost timing master.. 2500 stall .. 700r4 .. 3.73 posi fact s10 disc brake rear end.. caltracs.. 275/60/15 Nitto Extreme 555 drag radials
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Re: New converter

Postby raws10 » Thu Oct 12, 2017 2:15 pm

Good info..........btw I have a Ford 9 inch with 4:56 gears............with a spool........Going to try it out again on Sunday...I'll see if lowering helped at all............or try some different rpm's off the line.May even leave at idle and nail it.she shoots right up to flash .......like instantly!
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