codyscamaroz28

so i just bought my uncles 1997 chevy with the l31 5.7 vortec 350. bone stock, i plan on putting this in my 91 rs soon. my car is a 91 rs 305tbi 5-speed 3.08 gears. i looked it up an the vortecs are put out 255hp, an 330lb-ft stock. My brother has the 89 rs, with a 1995 lt1 out of a Pontiac formula with the 4l60e, bone stock with a 3inch straight pipe out the back, 3.23 slipping posi. now we are always trying to out to the other lol, my question is who will win. the lt1 is making 275hp, an 325lb-ft. good numbers. im thinking hes gonna pull on me passed 60.

89rs454

We really need to know, my car is ready.

cuisinartvette

Run him youll find out

CradleofFilth08

I'll say that Vortec will win, considering my mom's Tahoe will spank my Z from a dig or a roll.

budfreak1

iTrader: (7)

He's probably got the win considering he has better gears, more power, and probably a better powerband, since his motor is out of a sports car, and yours is out of a truck.
I speak from experience. I have a 97 Chevy silverado vortec 350 sitting right outside, and my dad had a 95 T/A for about 2 years.

budfreak1

iTrader: (7)

Dude, wth is done to the Tahoe or what are you doing wrong, lol? You should run mid-high 14's all day minimum with an L98, and no Tahoe from the factory can do that.

CradleofFilth08

That's the thing, nothing at all. That behemoth would hall *** like a raped ape straight from the factory! Maybe because it's a '99, I don't know. My only saving grace when racing my mother is that the Governor kicks in at 100mph.

CradleofFilth08

Racing my dad's '98 I beat it just because all of his power is being sent through the transfer case...on the other hand my Uncle's '97 has the button activated 4x4 and he doesn't have the same problems with the transfer case getting in the way....I'll post results in a few days. lol

budfreak1

iTrader: (7)

It should just have the same 250 HP vortec 350 being talked about here, and weighs over 5,000 lbs., and that goes for the other trucks too. You have a 240 HP/345TQ TPI under the hood and weigh 1,500+ lbs. less, plus have 3.42 gears. The math says, something is wrong with your car.

CradleofFilth08

She'll smoke the tires all day long though, my ran just as fine as the day I got it.

budfreak1

iTrader: (7)

My 97 truck is an ext. cab/short bed/350 vortec/4L60E/3.42 posi/2WD, has mods like UD pulley, ignition coil, TB spacer, true dual exh., and power programmer, and I still don't think I'd ever run with my GTA when it was stock. I can smoke V6 mustangs and all that in it, but I highly doubt I'd ever get one up on a 350 TPI.

budfreak1

iTrader: (7)

That means nothing though. It's the math that counts, and there is just no way a stock 350 vortec truck should be able to beat you.

CradleofFilth08

Well my dad's is a Z71 with 3.73's and a single exhaust, so maybe that's why. Maybe my mom's was a fluke build.

budfreak1

iTrader: (7)

I still think you have an issue. Just because it runs good, doesn't mean it runs right.
Let me put it to you like this: I raced a cobalt LS one day, and I was barely able to pull away from him on a slow roll, which means you would have ran dead even with him, from what your telling me. Do you really think a 350 TPI should be that slow, that a cobalt LS would give you a run?

CradleofFilth08

lol No but I've raced with my buddy in his '90 IROC and it was pretty much close race, I'd pull ahead because of my gearing but he'd close in because of his. If my car is off then I'd love to drive it when it's fixed. My car will dump you in the back seat on every gear change, that to me doesn't feel like it's off though.

budfreak1

iTrader: (7)

Well, all I know is something isn't right. Here is all the proof you need:
http://www.dragtimes.com/Chevrolet-C...slip-2392.html

http://www.dragtimes.com/Chevrolet-C...lip-14264.html

And the tahoe is probably slower, due to more weight, but I couldn't find a slip for one.

CradleofFilth08

The Z71 seems accurate...I just figured it was because of the Transfer case. The Tahoe is only 200lbs heavier than the truck but it's a 2x4....maybe my car is off. I'm replacing my trans soon so while my car is on jacks, I'll look at the engine.

budfreak1

iTrader: (7)

For comparison, here is a 92 B4C: http://www.dragtimes.com/Chevrolet-C...eslip-235.html

budfreak1

iTrader: (7)

Yeah, I'd give it a good look over and make sure timing is set right, injectors ohm out good, and fuel pressure is good, to start with. No reason you shouldn't just blow their doors off right from the get.

CradleofFilth08

B4C is just a Z in RS Clothing isn't it or does it have performance extras?

Would having 1 wrong injector size be enough to throw it off?

budfreak1

iTrader: (7)

It is the police package, but it is no faster really in the 1/4 than a Z, just handles and stops better.

Yes, 1 wrong injector will screw things up a good deal when it comes to A/F ratio, and so on. Your definitely losing something there.

CradleofFilth08

That's what I wondering, I had an injector go bad which was screwing up my idle pretty bad so when I went to replace it I googled the correct size because my dad wasn't sure and neither was I, needless to say I couldn't find an answer and I had to deal with the autopart store's guess. I think I have a 21lb injector in the first cylinder.

budfreak1

iTrader: (7)

You should have googled the part number on it, and see what you had when they gave it to you. Never heard of a 21, but you should have 22's. Even so, I don't think 1 lb. would be enough of a difference to hurt it that bad, and take over 2 seconds off your 1/4 times.
Your easiest and best bet: Get an ALDL cable and a laptop, download tunerpro, and find a friend who understands it all on here so you can make a log file and email it to him. This will help point to the issue, plus will give you 0-60 and 0-100 times and so on too, for comparisons. It's a good investment, will come in handy many times. I got my cable real cheap from here, in the classifieds.

CradleofFilth08

I've downloaded TunerPro just not the R/T...is that the one I'm needing? I've started to piddle with it but nothing too serious. I think I'll take your advice and once I start my job I'll get the cable. I appreciate the help.

budfreak1

iTrader: (7)

I think regular tunerpro will work fine for what you need. Definitely get the cable, you'll be happy you did.
Glad to help man.

cuisinartvette

Did I gloss over things or did the race even take place?
What happened?

Guest

Stock injectors are 19 lbs....

89rs454

Hasn't happened yet trust me when it does ill get it on video, win or lose. It will be a while though unfortunately, we still have to do the swap.

budfreak1

iTrader: (7)

On a 305, yes. He has a 350, which has 22 lb. injectors.

86White_T/A305

I think the lt1 has the race in the 1/4 mile.It has a mid/topend compared to the vortec 350.But if you are going to keep the 5 speed and use the vortec you have a good chance of pulling on the big end..or i might be dead even.

And Ill say this right now..forget the math of what should be faster when it comes to street racing..it doesnt apply with the huge variable of driver error.Wrong gear..spinning tire..too many things can make or break a friendly street run.Should be a drivers race if both cars are running 100%.Get the swap done and line them up..post the vids

I gotta ask between you both...whats the bet lol? Loser pays for the beers and a full tank of gas?

codyscamaroz28

yeah man a few cases of beer, an loser washes car. lol

LT1IROC-Z

iTrader: (2)

im gonna have to vote for the lt1..im kinda biased though..lol

Fast355

iTrader: (2)

I have a 6,200 lbs beheamouth Chevrolet Express conversion van with the 5.7 L31, 4L60E and 3.42 open differential. On the dyno STOCK it made 225 RWHP and 305 RWTQ (274HP/372TQ at the flywheel at 18% loss). BONE STOCK with the paper air filter in place and stock PCM tuning it ran a 16.2 @ 85 mph in the 1/4. Stock with PCM tuning it made 240 RWHP and 340 RWTQ (292/414TQ at 18% loss). With a production LT4 cam, crane 1.6:1 full roller rockers, doug thorley Tri-Y headers, 2.5" dual to single 3" exhaust, transgo HD2 shift kit, and an 0411 PCM it has run a 15.1 @ 92. With those mods its made 317 RWHP/340RWTQ (386 HP/414TQ at the flywheel at 18% loss).

It only had the PCM tune when this video clip was made, I let off when it shifted into 3rd because I was in a 45 mph zone.

codyscamaroz28

why the hell would you do that to an express van??

budfreak1

iTrader: (7)

I'm not sure I see your point. Are you just backing up what I said because even with all those mods, you lose to a stock L98?

cuisinartvette

Oh ok I was confused by this post

Fast355

iTrader: (2)

NOPE I am not backing your theory rather stating the opposite that a Vortec will hold its own against a LT1.

Street Lethal

iTrader: (16)

Budfreak is now officially on Fast355's sh-it list...

Fast355

iTrader: (2)

LOL, I think its the other way around.

I just find it humorous that someone really thinks that a Vortec 350 once removed from the truck it came in is magically still 255 hp that is all. The stock truck CSFI intake setup is junk on those motors, the factory truck tuning is terrible for performance and the stock exhaust horrible on the 1/2 ton trucks. Fix those three things and a stock internal Vortec 350 is a 300+ HP engine the way it sits. I know for a 100% fact that a production LT4 camshaft installed in stock 5.7 vortec engine, with a GMPP dual plane TBI intake running into a pair of shorty headers and single 3" exhaust was 280 HP to the tires through a 4L60E and transfer case in a 1995 K1500 truck. I also know that the same engine with a hotter GM 845 cam, doug thorley tri-ys, and a edelbrock victor jr 2bbl manifold made 350 RWHP.

Street Lethal

iTrader: (16)

I feel what your saying Fast, but I have given up on arguing with these guys, let them believe what they want to. If I threw up a video of my GTA running eleven seconds flat at 120-mph with my turbo 305 at only 10-psi they would still find something wrong with the engine, so I just ignore everyone and smile, especially when the boost gets turned up to 30 pounds next spring...

zraffz

Throw an XR276HR cam and proper valve train on that Vortec 5.7 and you will blow the doors off that LT1 powered 3rd gen, LS1 4th gens and hang with new Camaros.

cuisinartvette

Guess this section is Theoretical for a reason
where the dreams and bs run deep. LOL

budfreak1

iTrader: (7)

89rs454

We will see about that.