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383 tbi stroker

This is a discussion on 383 tbi stroker within the Performance forums, part of the General Discussion category; Hello all, First a little background: 1991 chevrolet K2500 tbi 5.7 auto extra cab on 35/36" tires 3.73 gears S&S ...

  1. #1
    Registered (truck) Abuser TIM222's Avatar
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    383 tbi stroker


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    Hello all,

    First a little background:
    1991 chevrolet K2500 tbi 5.7 auto
    extra cab on 35/36" tires 3.73 gears

    S&S performance here in Spokane Wash. sells 383's for TBI trucks $1790
    he says they came w/ a 4340? scat crank ARP rod bolts harmonic balancer
    in a 4 bolt main. Supposed to produce 300hp & 420 ft/lb. They also recommend a chip upgrade. I asked & he said the stock TBI unit would be fine.

    So I'm wondering what some chevy guy's in the know think of this deal?
    $1790 seems pretty good to me.
    300 hp & 420 tq? can these #'s be improved?
    Stock TBI - What S&S says seems to differs from ---TBI mods thread says:
    85% is an acceped Hi Limit
    a 48 mm dual TB flows about 670 cfm
    if you figure 1987-1995 OE 350 65# injectors
    @ 85% duty cycle @ 2hp/lb you get 221hp
    if you figure 1989-1993 OE 454 90# injectors
    @ 85% duty cycle @ 2hp/lb you get 306hp
    But s&s says I dont need the 90# injectors?
    maybe I misunderstood him?


    He mentioned JET chips.. Is this the recommended route?

    from FSC I get:
    Hypertech Power Charger?
    Flow Matched Tbi Injectors?
    Adjustable Fuel Pressure Regulator for GM Tbi?
    Injector Spacer?
    CFM Technologies' TBI POWER PLATE for 4.3/ 5.0/ 5.7L GM TBI ?
    How much of this stuff do I need?
    Does anyone have any experience w/ these items off ebay?
    theres a store that sells the injector spacer & power charger - any good?

    I know some of you guys have went this route & I'm looking for a little advise from people who know. Any help greatly appreciated.

    Oh hell it looks like I need a couple weeks to do all the research to make this thing kick @ss & I've already read everything in here. Maybe I need to read it all again so it sinks into my thick skull.

    Thanks,
    Tim
    2003 2500HD, 8.1 ALLISON 4wd 4.10s 305x70-16 Toyo 16x9 moto-metals custom paint 11,400LB toy hauler


  2. #2
    Needs project money chevyz71man's Avatar
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    Re: 383 tbi stroker

    Dont bother with a mail order chip. I tried brain and TBI chips and am very dispointed at what he got me. He is a great guy and got it running decent but not great. Invest your money into a wideband 02 sensor and do the tuning yourself. people on thirdgen.org know alot about TBI and what it can do. Stock injectors will not be nearly enough on the high end. I would recommend something more like a 80 lb at 14 psi. The stock injectors are 50lb not 65. 65s were in the cop 350s, Also offered in the holley unit. The holley unit will require alot more programming in the cold loop to get it to run right. You need to play around with the fuel mapping alot.
    1994 ECSB SAS 7" lift, satin black h2 wheels, 36" IROKS, 98 Interior
    Built 383 and Built 4l60E
    2007 Yamaha midnight warrior

  3. #3
    Registered (truck) Abuser TIM222's Avatar
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    Re: 383 tbi stroker

    "Edelbrock shorty headers, MSD Dist, coil and wires"

    How do you like those headers?
    I had a set on my Jeep w/a 350 seemed like the welds @ the collector were marginal & they were always frying gaskets

    Are you using the pro-billet dist.?

    I liked the pro-billet - MSD6.AL on my jeep setup.
    kinda thinking of going that way again.

    So many choices....
    2003 2500HD, 8.1 ALLISON 4wd 4.10s 305x70-16 Toyo 16x9 moto-metals custom paint 11,400LB toy hauler


  4. #4
    Josh
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    Re: 383 tbi stroker

    i love the 6AL on my tbi stroker. i 110% agree with not using a mail in tune. do some reading over on TGO about DIY tuning. it is much better than mail in tuning.

    u definately need more injector. i run 80 PPH @ 12 psi injectors on mine, and i've got plenty of fuel.
    89 K2500 w/ 383. TBI 383 w/ all the goodies. Dick Cepek 305/70s, 3" BL, 4.10s, EBL tuned by ME. Magnaflow exhaust....5" tips.

  5. #5
    Born and Raised Chevrolet YenkoST's Avatar
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    Re: 383 tbi stroker

    I ran 65 lb injectors on my 383 at 13.5 psi and was running rich so....65 lbs are plenty.

    1990 Chevrolet C1500 Sport
    *The Hot Rod
    2011 Chevrolet Silverado 6.2L
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  6. #6
    Registered (truck) Abuser TIM222's Avatar
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    Re: 383 tbi stroker

    Anybody have any dyno #'s on their 383?
    Be nice to see some real world tbi 383 #'s @ the wheels
    Anything anyone here would change?
    How do these trucks drive w/ these setups?
    Big change from stock?

    Interested in driving impressions...
    chevyz71man - 89stroker
    & any other trucks similar to mine running this type of setup

    Show me the money!
    2003 2500HD, 8.1 ALLISON 4wd 4.10s 305x70-16 Toyo 16x9 moto-metals custom paint 11,400LB toy hauler


  7. #7
    Kick Ass!! Red94Chev's Avatar
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    Re: 383 tbi stroker

    Quote Originally Posted by YenkoST
    I ran 65 lb injectors on my 383 at 13.5 psi and was running rich so....65 lbs are plenty.
    Yeah, but I'm sure that's w/o a custom chip to change the fuel tables.

  8. #8
    Kick Ass!! Red94Chev's Avatar
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    Re: 383 tbi stroker

    I asked & he said the stock TBI unit would be fine.

    Sort of - becomes power robbing at higher RPMs. Use the following calculator to estimate required cfm for a 383 with your shift points: http://www.4secondsflat.com/Carb_CFM_Calculator.html or http://www.wallaceracing.com/intakecfm.php <--- this one includes the type of intake manifold in its estimate. Note: this is for WOT performance - for daily driving part throttle starts-stops (90-95% of most people's driving habits), you wouldn't notice a difference. A much larger TB (i.e. 454 TB or Holley TB) will result in poorer off-idle throttle response though. Stock smallblock TB flows 490 cfm @ 1.5"Hg according to Airdeano's testing.

    300 hp & 420 tq? can these #'s be improved?

    Always

    if you figure 1987-1995 OE 350 65# injectors
    @ 85% duty cycle @ 2hp/lb you get 221hp
    if you figure 1989-1993 OE 454 90# injectors
    @ 85% duty cycle @ 2hp/lb you get 306hp

    This is crap math and oversimplified. Read my tutorial: http://www.fullsizechevy.com/forums/...d.php?t=200226

    He mentioned JET chips.. Is this the recommended route? Nope IMO. Choose from TBI chips (he's done a lot of 383's), Wait4Me, or Wester's Garage.

    Hypertech Power Charger? Not needed if using open element/cold air intake

    Flow Matched Tbi Injectors? Don't have to be flow-matched. Use either the 68#/hr or 454 injectors and a custom chip to run them properly.

    Adjustable Fuel Pressure Regulator for GM Tbi? Definitely - helps to fine tune performance

    Injector Spacer? Yup

    CFM Technologies' TBI POWER PLATE for 4.3/ 5.0/ 5.7L GM TBI ? Any spacer will do. Summitracing has them cheap or off ebay

    Theres a store that sells the injector spacer & power charger - any good? Read articles - http://www.cfm-tech.com/trucksarticle.htm and http://www.carcraft.com/techarticles...ake/index.html

    Hope this helps.
    Last edited by Red94Chev; 03-28-2006 at 05:51 PM.

  9. #9
    Born and Raised Chevrolet YenkoST's Avatar
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    Re: 383 tbi stroker

    Quote Originally Posted by Red94Chev
    Yeah, but I'm sure that's w/o a custom chip to change the fuel tables.
    That would be correct......but I wasn't going to spend the money for a chip when I had bigger plans that are now on the engine.

    1990 Chevrolet C1500 Sport
    *The Hot Rod
    2011 Chevrolet Silverado 6.2L
    *Airaid MIT, Custom 2.5" true dual exhaust, 2/4 lowering kit, HIDs 4300k, HP Tuners
    2012 Chevrolet Tahoe 5.3L
    *Airaid CAI, HIDs 4300k, HP Tuners...soon to be lowered

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    Kick Ass!! Red94Chev's Avatar
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    Re: 383 tbi stroker

    Quote Originally Posted by YenkoST
    That would be correct......but I wasn't going to spend the money for a chip when I had bigger plans that are now on the engine.
    You're running the stock chip with AFRs and a 383? I can't tell what mods you have from your sig. What a waste of what could be an awesome engine if that's true. The chip is what makes it all work, bro - I'm not surprised if you're running rich and your fuel economy is in the toilet. In the years that you've had the wrong chip, you would have easily paid for it in the price of gas you would have saved at the pump.
    Last edited by Red94Chev; 03-28-2006 at 04:35 PM.

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    Kick Ass!! Red94Chev's Avatar
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    Re: 383 tbi stroker

    Never mind - found your setup - http://www.fullsizechevy.com/forums/...d.php?t=183916

    You should really change your sig, dude. That and it's hard to read with the red font and grey background. Good luck if anyone is red/green color-blind!! LOL!! That's a sweet setup that I think some people here would be interested in. Ever get it dyno'd? Post it up!!
    Last edited by Red94Chev; 03-28-2006 at 05:47 PM.

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    Josh
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    Re: 383 tbi stroker

    the drivability of my truck is great. it idles pretty smooth, and makes very linear power. no rear wheel numbers though. i don't have access to a dyno. desktop dynoed at like 315 hp and 470 tq though.
    89 K2500 w/ 383. TBI 383 w/ all the goodies. Dick Cepek 305/70s, 3" BL, 4.10s, EBL tuned by ME. Magnaflow exhaust....5" tips.

  13. #13
    Needs project money chevyz71man's Avatar
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    Re: 383 tbi stroker

    On a cold day my truck needs to warm up for a bit, the tune isnt 100% right yet on closed loop. Other then that the truck seems to do good for itself, I can break the tires into second with no trans shift kit. Trucks has more bottom end then I know what to do with, thats why I built the engine. My tune isnt right though yet and dont have any dyno numbers.

    My truck is very driveable, I have about 6k miles on her
    Last edited by chevyz71man; 03-28-2006 at 07:53 PM.
    1994 ECSB SAS 7" lift, satin black h2 wheels, 36" IROKS, 98 Interior
    Built 383 and Built 4l60E
    2007 Yamaha midnight warrior

  14. #14
    Born and Raised Chevrolet YenkoST's Avatar
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    Re: 383 tbi stroker

    Quote Originally Posted by Red94Chev
    You're running the stock chip with AFRs and a 383? I can't tell what mods you have from your sig. What a waste of what could be an awesome engine if that's true. The chip is what makes it all work, bro - I'm not surprised if you're running rich and your fuel economy is in the toilet. In the years that you've had the wrong chip, you would have easily paid for it in the price of gas you would have saved at the pump.
    Yea, I will change the sig....I was thinking that the other day actually.

    I don't have my TBI system no more, its all MPFI. But my mpg is great, I really can't complain. I getting 12-13 in the city and 20+ on the highway without the torque converter lockup(with teh new setup). With the TBI, I had a Hypertech chip in it from my 350 and it got 15 mpg and 20-21 on the highway with the torque converter locking(TBI heads, etc). Anyhow, I do have a custom chip with the new setup and its been retuned once and its about to be retuned again.....I'm about to invest in a wideband and get this thing running the way it ought to. I did one run on the dyno run and it went 15:1 AFR quick so we aborted the run but considering how much torque it laid down and power for the AFR and timing I had in it, I was impressed. It has a lot more in it though . I'm hoping to break into the mid 12's with it though NA.

    With the 383 TBI, I made about 220rwhp/310 ft lbs. Off idle torque was a tire fryer for sure!! I didn't have anything in it really b/c I was going to change it all anyway.
    Last edited by YenkoST; 03-28-2006 at 08:07 PM.

    1990 Chevrolet C1500 Sport
    *The Hot Rod
    2011 Chevrolet Silverado 6.2L
    *Airaid MIT, Custom 2.5" true dual exhaust, 2/4 lowering kit, HIDs 4300k, HP Tuners
    2012 Chevrolet Tahoe 5.3L
    *Airaid CAI, HIDs 4300k, HP Tuners...soon to be lowered

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    Registered User 383K5's Avatar
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    Re: 383 tbi stroker

    I was doing my daily reading and saw the 383 TBI post, I just did the swap with a jasper 383 with dart heads and all of the goodies you're looking @. I'm running the 454 injectors with 13psi of fuel pressure. With a heavy foot, I'm averaging 13 mpg in town. The motor is a beast!!!! I got the chip from Ed Wright from Fastchips. So far the driveability is awesome and the idle is a little lumpy (cam). I only have 2500 miles on the set up now. I have all of the good stuff MSD, headers, magnaflow, FIPK II, elec fans, spacer for the TBI. I don't worry about the mpg too much, the truck is awesome. Just wanted to add about the Fastchip....

  16. #16
    TraumaticBrainInjury
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    Re: 383 tbi stroker

    OK, need help with the 383 tbi thing. You guys have been through this and I would really value your opinions. I'm having my favorite although very expensive race engine shop build me a 383 for my 95 k1500. It'll be right at 9.75:1 with Dart aluminum heads to help reduce the detonation. I don't know the exact cam specs but it's a full roller motor with about .550 lift and 110 or 114 lobe centers. He's also using 1.6 rockers on the intakes and 1.5's on the exhaust. Real HP/TQ numbers should be around 330/440 at the crank. What I need to know is an intake you would recommend and more importantly how do I set up my tbi. Turbo City wants me to go with their $990 kit for vortecs that they will tune for my app. I do want to use their throttle body but it sounds like most of you don't think the 68# injectors will be enough fuel. Plus it also sounds like few of you recommend a mail order chip. Please help because I don't want to run a new engine anywhere close to the lean side of things, awful hard on rings and cylinders. Thanks Guys, I know you won't let me down.
    95 K1500 383, Fo' 10's, 6" on 35's
    04 RCLB K2500 HD 6.0
    01 Yukon XL 8.1
    (T)raumatic (B)rain (I)njury

  17. #17
    Born and Raised Chevrolet YenkoST's Avatar
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    Re: 383 tbi stroker

    We need cam specs.....the 68 lbs/hr I had were plenty. Your cam lift numbers are pretty big for a TBI, heck they are bigger than my MPFI 383. Its going to be hard to tune and supply enough air for that thing.
    Last edited by YenkoST; 04-14-2006 at 09:05 PM.

    1990 Chevrolet C1500 Sport
    *The Hot Rod
    2011 Chevrolet Silverado 6.2L
    *Airaid MIT, Custom 2.5" true dual exhaust, 2/4 lowering kit, HIDs 4300k, HP Tuners
    2012 Chevrolet Tahoe 5.3L
    *Airaid CAI, HIDs 4300k, HP Tuners...soon to be lowered

  18. #18
    TraumaticBrainInjury
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    Re: 383 tbi stroker

    Quote Originally Posted by YenkoST
    We need cam specs.....the 68 lbs/hr I had were plenty. Your cam lift numbers are pretty big for a TBI, heck they are bigger than my MPFI 383. Its going to be hard to tune and supply enough air for that thing.
    That's what I'm worried about too but he's done a few of these and said they work great with the computer controlled engines. Hopefully I'll get the actual specs tomorrow and then I'll post 'em up. I know it would be a big cam for a non roller motor and maybe I'm remembering wrong too but I guess roller cams can use higher lift? I'm glad to hear the 68#'s worked for you. Should I even try to order a custom chip or take it to someone local when I get it all together?
    95 K1500 383, Fo' 10's, 6" on 35's
    04 RCLB K2500 HD 6.0
    01 Yukon XL 8.1
    (T)raumatic (B)rain (I)njury

  19. #19
    technut
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    Re: 383 tbi stroker

    waste the GM TBI computer and use a DFI if plans are like you are
    intending.
    aluminum cylinder heads and 9.75:1 still can detonate. so if thats the
    selling point, drop the aluminum heads and save a thousand dollars.
    a 383 is 10% larger than the 350, so 10% larger cam on a 350 is a stocker
    for a 383. same in fuel and air...
    so a .550 lift cam is 19% bigger.. so thatd be an RV cam for a 383
    i think you are spending a lotta cash for a larger headache later.
    but good luck to ya...

    airdeano
    2001 Silverado 4.8L 4-spd Automatic 3.42
    ? horsepower
    ? torque
    will find out soon!

    1965 C10 5.3L (SSR) TH4L60e
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  20. #20
    TraumaticBrainInjury
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    Re: 383 tbi stroker

    Quote Originally Posted by airdeano
    waste the GM TBI computer and use a DFI if plans are like you are
    intending.
    aluminum cylinder heads and 9.75:1 still can detonate. so if thats the
    selling point, drop the aluminum heads and save a thousand dollars.
    a 383 is 10% larger than the 350, so 10% larger cam on a 350 is a stocker
    for a 383. same in fuel and air...
    so a .550 lift cam is 19% bigger.. so thatd be an RV cam for a 383
    i think you are spending a lotta cash for a larger headache later.
    but good luck to ya...

    airdeano
    DFI = Accel?
    I'm actually going to trade him a new set of huge dart heads he built for me a while ago and I never used so the cost is kinda nil. I know it could still detonate but it's a lot less likely with aluminum and the right tuning, it's hot out here in AZ. What's the DFI setup cost?
    95 K1500 383, Fo' 10's, 6" on 35's
    04 RCLB K2500 HD 6.0
    01 Yukon XL 8.1
    (T)raumatic (B)rain (I)njury

 

 
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