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Is it possible to build the sledgehammer motor while using the stock fuel injection system? If not, what would I need to change.
I've bought a 5.7 vortec with computer, wiring, etc. Looking to get a flat 400+ torque curve all the way through the rpm range
Thanks
I have a recipe for a 383 making 450 ft/lbs from 2000 to 4500 using a 650 carb if that would help.Quote:
Originally Posted by whabamdo
that would be awesome, but this motor is in fantastic shape, so I really don't want to spend the money to stroke it, even though I would love to.
AND since I have the factory fuel injection, I would like to use it if possible.
Mr. Techinspector I would like that recipe, pleaseQuote:
Originally Posted by techinspector1
You might want to review this link.EFI for every guy.It has some good stuff in it.
http://www.popularhotrodding.com/tec...guy/index.html
Small block Chevy, 4.030" X 3.750"Quote:
Originally Posted by Bruce lee
6.000" rods. Scat makes a nice cast STEEL crank for use with 6" rods. Use a 400 damper and 400 flexplate for external balancing. Balance will need to be fine tuned at your machine shop.
http://www.summitracing.com/parts/SCA-935056/
KB164 19cc pistons (or anybody's 18-19cc pistons for use with a 6" rod and 3.750" stroke)
http://www.kb-silvolite.com/kb_car/p...tails&P_id=161
RHS 170 cast iron heads, 64cc chambers (makes 9.6:1 static comp ratio)
http://www.summitracing.com/parts/RHS-12410-01/
Use an Edelbrock 7101 or Weiand 8150 with 600/650 carb.
http://www.jegs.com/i/Edelbrock/350/7101/10002/-1
http://www.jegs.com/i/Weiand/925/8150/10002/-1
Use long-tube, equal-length 1 3/4" headers of your choice. And by the way, if the headers don't fit exactly on your application, use a Sawzall or cutting torch to cut away whatever is in the way, then weld the parts back in with altered pieces after you get the headers in. NOTHING SHOULD EVER GET IN THE WAY OF FITTING HEADERS. NEVER DENT OR TRY TO BEND A PIPE TO MAKE THEM FIT.
Custom cam. 208/213, 0.450"/0.450", Intake centerline 100.0, Exhaust centerline 108.5, Lobe separation angle 104.3, timing events 4/24/35/-2, overlap 2 degrees.
RPM HP TQ
1000 67 354
1500 119 416
2000 170 447
2500 214 449
3000 265 464
3500 314 471
4000 353 464
4500 385 449
5000 400 416
5500 369 353
Peak volumetric efficiency 84.0% @4000
Peak BMEP 185.6 @3500
This motor needs to be in a pickup truck with a 3.73 gear and a 2000 stall converter. It should rip the tires off in all gears stoplight to stoplight on pump gas. It would be ok with the stock converter and stock gear, I just think that to optimize the combo, it should have gears and converter. I see no reason this same combo wouldn't work with EFI. I know that normally, cams for EFI are ground with a wider LSA, so that would be something you would want to discuss with the cam grinder. Getting to this enormous torque at low rpm's required me to use a very short LSA.
So does anyone know if i can still use the stock fuel injection?
anyone know?
I suggest you couldn't use the stock fuel injection with out mods.It's kind of the reason behind the link I left for you.In that are companies that do use some of the stock parts that have been mod'ed.Quote:
Originally Posted by whabamdo
I too would love to be able to afford a Edelbrock system.But I am convinced a EFI system can be had and effective for a 383 reasonably.That it worth the effort for the benefits it offers over carbs.
One tip I can give you is to be careful buying old Edelbrock systems that are not supported by them any longer.The other one is the Fast Systems is everytime I looked at that is seemed to get a complete system,it nickeled/dime you to the same costs or more than the ones that sold a complete system in the first place.
So the long and the short of it-please do review the link I left.
You can get 400 hp from a stock fuel injection system. But first we will need to know what engine/heads you have & what kind of fuel injection system is on the engine. You will probalay will need a custom tune whatever you do. Stock tunes tend to lean more to the emission & fuel mileage side.
I think you will find the answer to your question in this ref link.It's more than I can write myself and is easier to just post the link.Please review it and get back to us.
http://www.tbichips.com/305mods.htm
BTW-it does talk about HP ratings to 450 or more.
Is this a tbi engine or vortec. The tbi engine does have center bolt valve covers but it is not a vortec. The easiest way to tell is to count the intake bolts. If it has 8 bolts that go straight down then it has vortec heads on it. If it has 12 bolts that are at a angle then it is a gen I small block. The best thing to do is to establish what your base is. There are so many different tbi engine out there. Don't forget these engine have been around now for 20 + years. I would start by getting the cast numbers off the block, heads, intake, throttle body, & injectors
I did read that entire efi for every guy link. But most of it seemed to me to be all new systems. ? Most of them I had seen before, but there were many new ones I hadn't seen that were interesting. I'll go back and look at it again.
its a vortec. does the tbi article still apply or is this a diff type of fuel injection?
p.s. the build i was gonna try to duplicate WITH using my fuel injection instead of the carb http://www.popularhotrodding.com/fea...ine/index.html
There's an online place called Turbo City that sells a lot of mod parts for stock GM fuel injection. I bought a few things from them when we put EFI in my son's 69 Chevy truck. If you're set on using the stock EFI you may want to check out their site.
I don't think your stock fuel injection will provide those kind of numbers.Quote:
Originally Posted by whabamdo
I read the link above.The comment I am going to make some will agree and some will not.These magazine test builds have one and only one purpose.To sell products that bought ad's in the magazine.Over the yrs I have had suspicions about hidden facts involving the products that were used.I would guess you do as well asking for advise.Well in part anyways.As a example I think I read the EQ heads are another import where I have researched some to find serious issues for the end user,you.I admit I haven't see much on the EQ's beyond ad's in engine builder.com.But that would make me wait and see what comes out of that.The other big thing from the link I see is you would have to have a bottom end not needing much more than a hone and go.
So guys come on this site and ones like it,to verify results with real street experiences with guys like Pat,Richard,Dave,and Jerry.And justifiable so because of the history of the articles found in the magazines.I would think the four guys I have listed from this site and others too,could generate the same output with any number of combos and at same costs.Their parts build lists,short of having one of them build the engine,are free without any attachments to ads.I is that,makes the suggestions much cleaner deal over a magazines test article.
So here is the bottom line suggestion.Read the supplied links I have left for fuel injections and read between the lines on magazines articles on tests of products picking threw parts to use that have a long term problem free results.
If the engine has vortec heads & tbi then someone has built it that way. G.M. did not make a throttle body injected vortec engine. G.M. sells a aftermarket tbi manifold for vortec heads, part # 12496821. It is kinda expensive at $385 to $425 depending on where you buy it. You can also use a regular vortec intake & install a adapter plate for the tbi. If you are set on using the tbi it can be done but you will have match the parts together. You can use a throttle body from a 454 it has bigger throttle plates. But that has its own set of problems. G.M. used a couple of different injectors for the same throttle body. You will also have to mill the throttle openings on the intake to fit the larger throttle body.
I'm sure it's stock. I don't know if it's tbi. I'm not sure where the tbi conversation came from. What kind of fuel injection is on the vortec motors?
TBI looks like a carb and TPI looks like tubes with a throttle plate at the front.Got picxs??.
Thanks everyone. Based on those links you gave me, Gary, I found a very helpful tbi reprogram guy. I've got it narrowed down to seeing if I can get a ls1 complete and have it support this power, or I'm just gonna run a qjet.
It's just crazy stupid expensive to make the system I've got work with high performance.
I've read all rave reviews on offroading with a qjet.
My only scare is a few people have told me that you have to mess with them all the time. Clifford, the qjet master, says properly set up, you don't have to touch them for years.
does anyone know, is this the case with carbs? even if you go into the moutains or major altitude changes?
Honestly I don't want to come off sounding as a jerk with this comment.But my question to you is don't you think with major altitude changes learning the skill of tuning comes along with the territory no matter which you go with??.Quote:
Originally Posted by whabamdo
Wanted to add this in for your consideration.I suggest with fuel injection and off roading,you don't have to be concerned with floats having a truck at many different angles.Be deductive I would think injectors would have it's advantages.Tuning wise, all you need is laptop.
Sorry it's been so long since I've been on here, I went back to Iowa to visit family, blah, blah, lbah, blah. Anyway, I saw your comments quickly right before I left, and after a week of thinking on it, it really hit me how dumb I have been! You are totally right. I'm talking about this huge project where I'm already over my head, and I've been focusing on tuning the stupid thing.
Thanks,
Also, thanks to your tbi link, that guy has actually convinced me that a LS / Gen III motor I think is the way to go. I can get them for about the same deal if I'm patient, and the fuel injection will totally support the build I want. When I add up the numbers, it looks like it will be less expensive, AND I'll get the injection :).
Now, I have to look at learning about gen III motors, .....
Sounds to me like you've learned a LOT already;)