checked timing i had 31* total, re-set it to 34* because i heard thats the most vortec heads can take. Checked plugs no detonation. Hopefully going to test n tune tommorow going to try and play with burnouts/air pressure to hook up the BFG's. Hoping for some 8.5's! Anyone point me to some:

air pressures/burnouts for bfg dr's?
shift points?
Timing?


Going to try pulling the air cleaner off too.

 

The timing should do better at 34*.
Air pressure? I dont know on the DR's but someone should chime in.
Try shifting at 5800 and 6000 and see what works better. You might try 6200, but I dont remember the rpm range of the HOT CAM.

You need to be crossing the line at 200-300 rpm past the rpm of you cam range.

I never run the air cleaner at the track. To and from, but not at the track.

 

The BFG's i had liked 20-22 pounds of pressure. is it a factory tach? if it is, then shift when the tach says 6500 and then you'll have a shift point around 6000. vortec heads don't like much timing at all. 34 is about right. good luck with it, just watch the tread on the tires, radials will wad up in the middle with too little pressure.

 

I'll try 20psi and 6500 shift points then and take the air cleaner off. How big of a burnout do i need? Do it in the water and roll out?

 

do the burnout after the water, otherwise you've just rolled through more water after the burnout and the tires are wet again...

 

I've got 4.11's in my 9-bolt. They came directly from NZ though.

 

Tuesday got rained out so i went down the track once tonight. Lowered air pressure to 19-20 psi in tires, took air cleaner off and set timing to 34*. Tires still didn't hook probably due to crappy track conditions on wed. Air dipped into the high 50s. I shifted at 63k. Took off pretty good car felt strong. Ran 8.81, so 8.7s are possible. I want to get down to 8.3s 8.2s but id be happy with an 8.5.

I have the slp headers going to straight pipe (where cat would be) then a 45* bend and to the magnaflow cat back system. If I took the 45* bend out and put in a mandrel bent 45* how big of an improvement would that make? I'm wondering if that bend is restricting things.

 

how do you guys think i could lower my times some more to get to 8.3? I'm thinking getting a holley 750 street hp DP and replacing that exhaust bend with a mandrel bent and getting the tires to hook, probably some 3.73s and a th350. But that would be next summer.

I'm wondering though if hopefully i can get to test n tune night and see if i can get the tires to hook and see how low i can get my times down just by driving, launching and shift points work. Ran 8.81 on one pass I could at least get it into the 8.7s or maybe 8.6s. Probably some more in carb tuning too. I want to hit an 8.5 before september ends.

After I can get it as fast as i can on motor there will be a thread "how to get into the 7s" and ill be spraying my way there most likely

 

you need tires, and a 650 double pumper would likely get you into the 8.3's or so...

 

Will the 650 be big enough?? Definetly go DP? I was thinking one of those street HP carbs. I didn't think the BFG's would suck this bad, If i had known that i woulda shelled out the extra 50 bucks for the mickey t's. Maybe they will hook when the track is actually prepped right like on tuesday or fridays.

 

i would have gone with the mickey t's from the get-go. there's a reason there's so much hype on them...they are hype-worthy!

the 650 double pumper on your combo will be more than enough. but definitely go with a mechanical secondary....wouldn't think any other way for a serious strip car.

 

Well its not really a serious strip car its my DD in the summer but i like to take it to the strip and make it faster and faster. It probably is the carb, right now its a 3310 carb thats probably set up all wrong (drilled throttle blades, 4.5pv etc) only thing i did with it was set it up and changed a spring to get rid of bog. But the plugs look good and it seems to run pretty well. But the DP would definetly make some more horsepower?

 

oh yeah...my little 305 had a 600vs carb on it (4150 style) and i put a 650 double pumper on the car and it went from 13.7's to 13.0's...and got better fuel economy! i'm not gonna say it'll drop .7, but that's the drop i saw with my little 305 a few years back.

 

Ill probably be buying a carb then when i sell my intake. My buddy still owes me a 750 eldebrock, I wanted to try that and see what difference it would make.

 

How much horsepower do you guys think im making? I based my build off of this article:

http://www.chevyhiperformance.com/te...ild/index.html

and they put out 412 horsepower. That should equal at least an 8.3 et.

Something is robbing me of power guys, (OR SUPERCHEVY ARE LIARS!) maybe that non mandrel exhaust bend?? Should I do a compression test? I just rebuilt the motor the rings aren't fully seated yet as it still uses a little oil but its got over a 1000 miles on it should be seating pretty soon.

My build: Their Build:

Carb: 750VS Holley, 750DP Demon
Intake: Eldebrock perf RPM, GMPP aluminum dual plane
Heads: vortecs
CAM: "HOT CAM"
Block: 355, 355
Timing: 34*, 34*
Gas: 93, 92

I have 1 3/4 slp shortie headers to y pipe to a bend to the 3" magnaflow catback. Only thing I can think of is the vacuum secondaries are somehow costing a lot of horsepower.

 

I got to thinking and im going to try re-adjusting the valves tommorow but this time only go a 1/4 turn past zero lash, I went either 1/2 or 3/4 before i think maybe they are too tight and im being robbed of lift/compression.

 

I re-adjusted valves, butt dyno says an improvement was made. I still want to do a leakdown test though b/c i noticed some blow by coming out of the breathers. I also want to throw it on the dyno at school whenever i get the chance.

 

If you dont have a pcv system set up, then you will blow some oil out the breathers. I had the same problem, hooked up the pcv and no problem.

 

yeah i can't run pvc b/c my stupid carb doesn't have any vacuum ports. hopefully will be getting a 750 double pumper soon if someone buys my HSR

 

Email me with complete details on exactly what you got there (HSR)
You have the correct manifold for the vortec heads, right?
russ_q@hotmail.com

 

drop the BFG's down to about 16-18psi hot and dont go in the water...go around and do a good burnout...thats what I did and got me a 1.7 60' but ofcourse im not happy with that...i want 1.5ish or so

 

I will try that, I have 255/50-16's on stock iroc rims. I can DEFINETLY feel a difference after i adjusted the valves, can't wait to go to the track and see what it runs now! hoping for an 8.5 also i retightened my headers


FBIRD u got mail

 

found another build similiar to mine 440hp diff cam but similiar and eldebrock 750 carb : http://www.carcraft.com/techarticles...ne/index1.html

i wanna try the eldebrock carb, anyone had any experience with them?? I like holleys but im not liking the vacuum secondaries at all takes too long to kick in definetly costing me some time and yes i ****ed with the springs and stuff. I wanna get me a double pumper ill be haulin assssssssssssss

 

okay guys i just got back from the track I RAN AN 8.10!!! I couldn't believe it, it was the valves the whole time, lesson learned only go 1/4 turn past zero lash, not a 1/2 not 3/4. I dropped the tire pressure to 16 drove around the water and did a big burnout with black smoke for some reason? Tires hooked up i went to shift at 6500 but tranny shifted itself at 6250 for some reason I didn't look at how fast i was going but damn an 8.10 they make you wear a helmet if you go faster than 8.3 wow really excited now. I also added 1 gallon of 100 octane to a 1/4 tank of 93. I didn't have time to take my air cleaner off and i had my toolbox with me too, with that and driving i bet i could run an 8 flat maybe a 7.99 if i get really lucky. now to start the 7 second thread!!! Drag racing is addicting man at first i started out with a 9.8 and have worked my way down to an 8.1 from tuning and carb swap and learing about racing just incredible

 

just wait till you get the double pumper on there...

 

i know the DP should get me in the 7s for sure huh?? what do u think about eldebrocks arent they double pumpers too?

 

what kind of lifters are you running? i always run 1/2-3/4 turn preload to center the plungers and its always worked well for me.

 

Keep your Stealth Ram EFI and bone up on how to tune it.
Old dogs can learn new tricks. Its not that hard to do.

It will run just fine when dialed in. Will out perform any carb you buy. Any carb you buy will need tuning too. Your vac sec carb is fully capable of very good performance and ets but you will need to monkey with it.
The secondary opening action is set up very conservative from the factory.
You need to dial that in so it open at just the right rate to open fast but maintain sec airflow velocity and establish quick fuel flow as the car launches and starts to accelerate. Trust me once dialed in properly thye work just fine.
Your EFI will too.

 

the efi did not perform it had a mail order chip for it yes okay thats a base tune but an out of the box carb outperformed it and only got 1-1.5 less mpg. Tuning a carb is easy, tuning efi involves expensive "tools" and the programming is difficult for someone without a background in computers to understand (a gearhead maybe hmm) I looked into it. I'm WAYYY happier with the carb. Aside from more horsepower, Looks are great for 1, looks alone are worth the swap, 2 theyre simple, 3 youll fall in love with the sound of carburetor after a while I know carbs i love em ya know. what efi did was it threw a bunch of extra wires, sensors and the magic black box that you can't control and therefore cant do anything on it and well made working on cars suck. I screwed around with the efi, some guys like the computer programming i know one guy orr86z ? from pa has one and he's running 11.4s on a 383 on motor. But my buddies were right about the efi the carb did make it run faster. anyways the carb has been on for some time now, the wires are cut and the hsr is being sold.

i'm looking for even more et. About the vacuum secondaries, i've heard a lot of people say that ya know: they are better for gas mileage, heavy vehicles/high gears, better streetability. I know how to tune i holly, I have my 3310 running pretty good. I changed the springs, yellow bogged and i put in a purple, still the secondaries are going to have a delay no matter what due to their nature of actuation. About the gas mileage, just stay in the primaries on a DP and you'll have the same gas mileage. Go into the secondaries and both are going to be bad except the dp will put an extra acc pump squirt in. Plus DP's open all the way. You're in control of the secondaries. sounds good to me.

 

computer tuning- it might be nearly impossible for some people to learn, and thats why they should take it to someone and have it tuned. after its got a good tune, you wont have to mess with it anymore. which actually makes it easier to tune than a carb since you wont ever have to tune it at all. lol

main thing for me is walking up to a fuel injected race car, sticking my arm through the window and starting it up. no blipping the gas 2 times or whatnot.
-and it starts up in 25 degree weather like that too.
its pretty common for LS1 cars to make 400rwhp and get 25+mpg.

just thought i would mention this stuff. its not as bad as many make it out to be.

 

I'm with diggler, but pm me about the stealth ram if you're selling it...glad to see you got it working my friend's car went 7.92 with a 750 DP on it but it had a bit more cam

 

hsr is pending sale if it doesn't go through ill email you. I tried to find a tuner but no one in this town does computer tunes on older than 96 everyone here just runs carbs. all you see at the track is carbs.
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hsr is pending sale if it doesn't go through ill email you. I tried to find a tuner but no one in this town does computer tunes on older than 96 everyone here just runs carbs. all you see at the track is carbs. Strip cars all got holleys and all the street has eldebrocks

 

Don't tell me nobody in Buffalo does EFI tuning.
http://www.kennedysdynotune.com/ They are in North Tonawanda.
They can completely dial in that Stealth Ram for maximum performance and great drivability. The money spent there will be returned 3 times over over time in reduced engine wear avoidence of potential costly engine damage and wasted gas from you farting around swapping carbs etc etc etc. A carb needs tuning to achieve maximum performance. ALL out of the box EFI needs tuning too. Just like a carb.
It will out perform any carb. You'll get years of enjoyment out of your car that you can actualy afford to drive and run great at the track.

Go see them.

 

i already looked and asked a lot of people and nobody would do it. Carb is going to make more power anyway fuel injection sucks freaking computer bullshit hi performance motors all got carbs

 

lol are you serious?

 

go to the drag strip the only fuel injected cars youll see are methanol dragsters. The carb made more power I already proved it. seriously **** the computer bullshit. all efi did was throw a bunch of sensors and wires into the engine bay. It's so much better being able to tune the carb.

 

Finally got to tune the car on a dyno, ended up with 67/75 jets and 33* total timing, gained 12hp over baseline. Racing starts tomorrow if its not rained out, hopefully that should be good for a tenth! I also added LCARB's and got the M/T DR's.

 

Good luck. The LCA's and DR's should help get the 60ft down.

 

I got one run with them on last year, when I went to the M/T's my rearend was popping up and the LCARB's fixed it but I was still slipping some, I think I might need to go to a real slick. If this don't put me into the 7's I got a 4.10 rear im going to swap in.

 

those mt's will hook on a prepped surface. on the street they'll still slip a little bit.

 

so how is it doing? and what numbers did you get from the dyno?

 

Anyone who thinks they can make more power from a carb than from fuel injection doesnt know how to tune fuel injection. Have you had your combo dyno tuned? 48 psi on 24lb injectors sounds a little lean for your HSR vortec combo.

 

I agree, but you need to go back and read all of the posts and the dates they were posted.

 

geez.. just slap a carb on it so it'll make more parrr.
hope someone got a good deal on the hsr. it should have made just as much power as the carb. or better, considering it could make its own adjustments without having to take itself apart and rejet everyday.