Is this fast for what it is?

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Is this fast for what it is?

Postby Blazer Bob » Sat Feb 13, 2016 6:44 pm

99 four door blazer. zz383 ,700 r4 stock rearend and stock highway gear. 0 to 60 in 5.2 seconds spinning tires a fair amount in first.Image
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Re: Is this fast for what it is?

Postby Blazer Bob » Sat Feb 13, 2016 7:25 pm

Stock rims and 235/70/15 tires , small converter, 750 edelbrock carb. Only have about 300 miles on it so far. small tube shorty headers ( Rick Racers favorite). Motor spins right up to 7000 rpm real fast in first with a fair amount of tire spin . They say 6000 is all I should spin it but in first 7000 is real easy to do. You guys think it will hurt it? forged crank and rods. This is a gm crate motor. Idles real smooth for a cam that has 509/528 lift full roller cam with roller rockers to and fast burn heads.
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Re: Is this fast for what it is?

Postby lowblazin94 » Sat Feb 13, 2016 8:48 pm

I'd have to see the dyno sheet and what it was balanced to.

I wouldn't see a need to run it that high, shift when torque falls off.

But check the balance job and make sure it can handle it.

As far as time, if you can't hook and with the weight you could be 13-14's maybe but once you are able to hook then that rear end will blow.
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Re: Is this fast for what it is?

Postby Rickracer » Sun Feb 14, 2016 9:05 am

I'm betting that cam is not designed to make power that high, get a strong rear in it, get 'er to hook and shift sooner, it will be WAY faster. :wink: 8)
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ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: Is this fast for what it is?

Postby Blazer Bob » Sun Feb 14, 2016 1:22 pm

509 intake,528 exhaust , 222,230 at .050 duration, lobe separation 112. full roller and 1.5 roller rockers. I was hoping for a nice lopey idle but this thing idles as if it were all stock with almost no hint of a cam at all.
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Re: Is this fast for what it is?

Postby bgblock427 » Sun Feb 14, 2016 9:57 pm

Thats not allot of Dir and the 112 Lc so it would not be to choppy , be good for NOS. I would not be spinning anything stock to 7K. Like rick said change gears and shift at 6.
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Re: Is this fast for what it is?

Postby Blazer Bob » Thu Feb 18, 2016 6:39 pm

Man, my first tank of gas I averaged only 11 mpg, With a 750 edelbrock carb. I knew it would be bad but not this bad. I must learn to keep my foot out of it!!!
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Re: Is this fast for what it is?

Postby Blazer Bob » Tue Apr 18, 2017 5:52 pm

Hey guys I now have 3,500 miles on truck and get 14 mpg with the 750 edelbrock. my 0 to 60 best is still 5.2 leaving at a idle to stop wheel spin and axle hop. 1/4 mile is 13.85 at 101 leaving soft. Truck has a 2.500 converter but anything over a idle launch and it spins bad or I get really bad wheel hop. I have a gu4 code in glove box and think that is a 3.08 gear. If I get a 8.8 explorer rear with 3.73 and posi and caltracks and leave at 2.500 rpm like my converter is will I get a much better et? what could I reasonably expect? will it wake this thing up and make it much more fun to drive? Thanks guys.
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Re: Is this fast for what it is?

Postby lowblazin94 » Tue Apr 18, 2017 6:11 pm

700r4 with 3.73s will be a good gear. Traction bars will help and will fix the axle wrap. You don't want to "dead hook" off the line so foot brake vs flashing the converter will be by trial and error.

A looser converter will help but need to know more cam specs.
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Re: Is this fast for what it is?

Postby lowblazin94 » Tue Apr 18, 2017 6:16 pm

Nevermind just saw cam specs. Need head specs, "fast burn" heads don't show much.

That single plane intake and 750 carb with a 2500 stall and 308 gear arent helping though.

I'm assuming you have the 425hp crate motor? Should be very close to 13 flat
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Re: Is this fast for what it is?

Postby Blazer Bob » Tue Apr 18, 2017 7:09 pm

Vortec aluminum fastburn heads, yes gm crate motor. 3.08 to 3.73 posi should I expect a full second off 1/4 mile time or is that asking to much?
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Re: Is this fast for what it is?

Postby lowblazin94 » Tue Apr 18, 2017 8:09 pm

That's asking a lot just for a gear change. You will be hitting the tires harder and you will need traction bars to take advantage of the 60ft with some good radials.

To really get that thing moving a 2800-3000 stall will help too and take advantage of the power band that intake is giving you.

You can try easing into a foot brake launch and not hitting the tires as hard. Knowing the rear tire and psi you run at the track will make a difference. Torque gets you across the line faster while HP sells motors.
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Re: Is this fast for what it is?

Postby Rickracer » Wed Apr 19, 2017 5:22 am

Honestly, I'd be looking to swap that single plane intake to a Performer RPM Airgap, go a little higher with the stall speed, (actually the intake will help raise the actual stall speed with more torque too), look at switching to a rear tire that hooks better, DEFINITELY add a traction device, (either slapper bars or a CalTrac type, I've used both with pretty good success). If you have enough clearance, maybe switch to a set of 1.6 ratio rockers. All those things together should put you DEEP into the 12s. :wink: 8)
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'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: Is this fast for what it is?

Postby ChevelleFan » Wed Apr 19, 2017 11:32 am

I have a bone-stock ZZ383 in my '70 Chevelle. I'm running a Holley StealthRam EFI setup controlled by a Megasquirt. 700r4 w/3000 stall Summit converter, 3.55 posi. on 26x10.5 ET Streets, I'm running 12.20s @ 109, (best 12.18) 1.6x 60-ft, with open headers, shifting at 6000. My track's elevation is about 1200ft. Keeping my foot out of it, I got ~15mpg driving to/from the Woodward Dream Cruise last summer. (no lockup)

The Fastburn head has a 210cc intake port and published chamber size is 62cc. My Stealthram is not port-matched, and probably a little undersized. I've considered putting the stock single-plane back on with a Holley Sniper to see if I can crack 11s, but it drives so good right now I don't wanna mess with it.

700r4 w /3.55 gears gives a 10.8:2 starting line ratio. 3.73 bumps that to 11.4. Granted, I'm running some pretty short slicks, but 1st gear is over FAST.

My '85 V8 Blazer is 150 lbs lighter than the Chevelle, and the Blazer has iron heads -- I weighed them both on the same CAT-certified scale. Properly sorted, your ZZ383 should be able to get into the 11s, depending on elevation. Another guy on chevelles.com had one in a well-sorted chassis with a TH350 and 4.10s, went 11.80s @ 110. Hot Rod went 11.70s @ 111 in a 3300-lb Chevelle. (thats a light Chevelle)

Your 3.08 is hurting you, but you should still be doing better than 13s @ 101. Change the gears and get a better converter. Don't touch the motor.

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: Is this fast for what it is?

Postby ChevelleFan » Wed Apr 19, 2017 12:57 pm

If you're only going 101, you've got some tuning to do. Edelbrocks are nice street carbs, but seem to rarely produce optimal track times.

Don't rev it out to 7000, that's not helping.

What's your total timing? GM says 32* max. 34* produced highest MPH at track for me. I tested 32, 34, 36, on 91 octane.

Not sure how much your exhaust is holding you back -- some for sure. My times stated above are with 1 3/4" full-length headers.

I missed the 1st post where you mentioned '99 4-door blazer. Probably not as light as my 85 2-door, so no weight advantage as I originally mentioned.

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: Is this fast for what it is?

Postby Blazer Bob » Wed Apr 19, 2017 7:44 pm

I am running small tube shorty headers, I know they are to small and less than optimal but they fit. Was really thinking about a performer rpm dualplane like Rick said. It would still turn 6,000 easy I would think. Not sure about timing, a buddy set it for me and it starts good so I don't mess with it. Been looking at that holley sniper also. Do they work better with the single plane ? I think I have read that some place. I would also want it to control timing for me. Rick if you read this would you be interested in building me a 8.8 with all the good stuff and caltracks? I am only 4 or 5 hours north of you.
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Re: Is this fast for what it is?

Postby Rickracer » Thu Apr 20, 2017 7:30 am

Sure, I can build you a nice 8.8, but I'm not really set up to do stuff like the Cal Trac clones cheaper than you can probably get a machine shop to do them, or even to just buy a set of genuine ones. There are diagrams for the Cal Trac clones in the suspension section sticky. I bought mine from a guy that used to be on here all the time, as did a few others. Is the Sniper an EFI system? If so, I'm pretty sure it would work best on a dual plane intake, but the RPM Airgap is the really best of both worlds rolled into one, I HIGHLY recommend it! :thumbup: :thumbup:
I'm running the MSD 6530 box, (Digital 6AL2, laptop programmable), on my truck AND my race car, HVC/HVCII coils, and MSD Pro Billet distributors, so I can make a "Vortec/Fastburn friendly" advance curve on the truck, and control timing via boost, and also have "antilag" for the boost, on the race car. 8)

Oh, and BTW, a set of long tubes would probably add somewhere between 15 to 25 hp to your combo, :wink: 8)
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: Is this fast for what it is?

Postby Blazer Bob » Thu Apr 20, 2017 5:48 pm

Would you be interested in doing the swap from start to finish? I would bring truck to you and you swap it out and keep the stock rearend for what its worth. We have a pick in pull here that has lots of explorers in it so I would think you could easily find one in Orlando. Do you still cut one side down and use two short axles? I would want all new disk brake parts and what ever other new parts you think it would need to be 100% reliable. Caltracks are very expensive but I would buy new ones to get the job done . 3.73 or 4.11 gears and posi for sure. Gears would be left up to your expertise as to which one would make this thing move best. Also would want axles drilled to chevy bolt pattern so I could keep my stock wheels. Truck makes nice sleeper with no signs of a v8. Even have the flat hood on it.
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Re: Is this fast for what it is?

Postby Blazer Bob » Thu Apr 20, 2017 6:40 pm

Rick , send me a private message with a phone number and best time to get a hold of you if your interested in doing this swap.
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Re: Is this fast for what it is?

Postby Blazer Bob » Wed May 17, 2017 5:28 pm

Hey Rick, I am still very interested in having you build me a 8.8 rearend. Will these hold the power of a LS motor? Might go that route one day.
I will call you soon to talk about this.
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