vortec350s10

My setup: 350 HO (vortec headed) crate with Comp XE268 cam (224/230), performer rpm intake, Demon 650 Vac, 700r4, Vig 3000 stall, 3.42's with MT ET Radials. My best run so far is a 13.5 @ 102 with my old 2400 stall and street tires, spinning slightly with a 2.08 60ft. I haven't run with new converter and tires at the track yet but my 60ft on my G-tech is around 2.05, which is a little off but I don't think I'll be doing any 1.8's the way it feels right now.

My question is this: Do you need mad power to run 1.8's and lower? I realize lower gears and a higher stall would help, but what would be a realistic goal with my setup? I am still doing some tuning with the accel pump and secondary opening rate. What are people running with similar setups?

DPSJosh

So you ran a 2.08 on street tires and a small stall? If so, that's not bad. With the stall and MT drags, I would hope for atleast a 1.8 if not lower.

brandoz28

iTrader: (1)

you should be running mid 1.7x 60ft's with a 3000 stall and 3.73 gears.


i can 60ft 2.05 with my stock convertered, street tires, 3.73 geared 305 TPI. and that's running on motor too.

1bad406

iTrader: (1)

Don't expect much on street tires. Put on some slicks or ET streets and stall it up on the line all it will go without pushing through.

vortec350s10

I have Mickey Thompson ET Street Radials. I am wondering what other people run with similar car and engine setups. I will be going to the track in a week so we'll see how the tires and new converter help.

vortec350s10

UPDATE: Alright with the new Street ET's and Vig converter flashing around 3000, 60ft's were a consistent 1.94-1.99 through 7 runs. No tire spin, so I kept the tires at 35psi. My car is not lightened at all, but I would hope to still improve those times. I was surprised foot braking and launching at 1200 or 2300 made virtually no difference. (The brakes will only hold to about 2300.) I think I'm gonna play around with tuning the secondary opening rate next since I finally have my accel pump tuned fairly close. Anyone else with a similar setup- post your times!

brandoz28

iTrader: (1)

does the car bog or hesitate right at the hit?

Gumby

Id say yea the carb, Im guessing you want to still get some MPG sticking with that 650.

If your gonna be searious about it, be seariuos. If tuned right bigger can give some MPG.

Id go right for a 750-800Qjet with Doug Roe performance mods
He wrote the book on that, and designed the Qjet for GM, once ya step around the stuff done for mass produced cars on them, you can't beat a well tuned Qjet. Till you need more, then its right to a 1000DP

pancherj

What's your base timing set at and are you using vacuum advance? Timing may give you a good deal of low end torque if your curve isn't optimized. I have a 3600 Vig. converter and it always launches best when I don't bring up the RPM's at the line. I just launch from idle (1100RPM).

bluegrassz

iTrader: (3)

No one has mentioned LCARB's.

1bad406

iTrader: (1)

I still run my LCA's in the stock location.

Get London to put on some 6.0 7.0 stuff. I know serveral from crossville, tn ride up there and race.

vortec350s10

It doesn't hesitate at the launch, it'll come up to 3000 stall fairly quickly. My base timing is at 13 degrees with 22 degrees of mechanical advance, netting 35 degrees total timing which is all in at around 3200. I am running vacuum advance which is plumbed into straight manifold vacuum, so it has it at idle. I'm guessing LCARB's are lower control arm relocation brackets? I have no traction issues at this time so I don't see how that would help with anything. I have aftermarket non adjustable LCA's, stock location. My suspension is entirely stock iroc including original bilsteins in the rear which are still good.

joeblue83

iTrader: (8)

I run m/t et streets and have gotten my 60 foot down to 1.51. I run a max of 20psi on the et streets.

pancherj

What diameter are the tires? 3.42 isn't a lot of gear for a 350ci small block. If the tire is 27-28" in diameter, I think gears or smaller tires are in your near future. I run 4.10's with a 26" tall tire. I cross the line at about 6300RPM...I wish I had gone with 4.56 gears so I could run a taller tire. I am hooking low 1.6's with mild tire spin.

vortec350s10

My tires are 255/50/16's which are 26". Stock iroc wheels are pretty heavy, much more than my 17's. Since I have LS1 rear brakes I kinda screwed myself and can't run 15" wheels anymore. My friend with an almost identical car with 3.73's can only pull 1.9's as well but his MT's are pretty shot and spins a little.

mw66nova

iTrader: (13)

i see you said you're working with secondary opening rates, this makes me assume you're using a vacuum secondary carb. since you now have the advantage of the 3000 stall speed converter, get a mechanical secondary carb on there asap to watch those sixties drop my friend.

bluegrassz

iTrader: (3)

Keep an eye out on the London Dragway website. You never know what Craig sets up.

Im running in the lowest hole of my LCARB's and with a 3500 10" converter, Hoosier QTP's, 3.73 gears and a TH350 trans, I am getting low 1.6X ft times.
The rest is in my sig.

86Z

iTrader: (4)

although i do not have an auto, i do have a 5 speed and 3.73's with 16" wheels 255/50/16 m/t et streets, best i did with a baby launch was 1.79 60' no spin, i have lca relocation brackets and spohn tubular lca's

vortec350s10

So I realized both sets of spark plugs I've had with this motor have been the shorter reach plugs .460" instead of the .710 length recommended for the vortec heads. By swapping to the correct plugs, it launches harder without the slight hesitation it had before. Last night I ran 9 runs between 13.3 and 13.1's where as my best time before last night was a 13.4. I gained 2mph trap speed as well. By leaving my ET's at 35 psi I was having some traction issues, but I did not lower the pressure, just experimented with different length burnouts which did not have a noticeable effect. My 60fts are now in the 1.95 - 1.85 range but I wasn't dead hooking off the line so I think low 1.8's are now attainable. Just thought I'd throw out some info in case anyone else is curious about my results of swapping plugs.

xpndbl3

iTrader: (5)

35psi is way too high for those tires, I used to street drive them at 24-25psi and race them at 19ish from what I remember. Forget longer burnouts, drop the tire pressure and save the rubber on the tires.

Big Dog Chevy

Yeah, 35 psi is too much for the track. 19-22 psi should be good for your setup. With the 255/50-16 BFG drs I cut 1.65-1.75 with no problems on a 1000 rpm launch and 3000 stall at 3650 lbs race weight. Drop the tire press, stall it to 1000 rpm and nail it. If you have your carb tuned right it should jump of the line with no wheel spin.