 Qustions about tuning.., TBI engine qustions |
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 Mar 19 2008, 01:34 PM
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#1
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 ATGO Yapper  Group: Members Posts: 977 Joined: 22-February 08 From: North Austin Member No.: 336  |
OK, I'm gonna put a new 305 back in my vert, a medum cam, dont konw what i'm going to do about heads yet.. possably bigger intake and TBI. Here is my qustions....
How do you "Tune" a car? Silly qustion maby. but honestly asided from getting it to run and maby adjusting the jets on a Carb i have no idea how this is done on TBI or TPI. since i'm running TBI, and want to stay TBI so i dont have to swtich over compuers and all of that jazz. I was wondering if anyone knows how to "Tune" them.. what is involved and how good can you really make them run ? any and all information onthis woudl be helpfull as it will help deturmin what i'm going to end up doing to my motor down the road. Thanks. -Randy- -------------------- --1991 Camaro RS Convertible-- (LO3 - V8 - TBI) 5.0 Liter - Borg-Warner T5 Manual - Performance Chip--
--Current Project- 1997 SS Camaro LT1 & T56 for my 91 Vert-- Previous 3rd gen's: -1982 Camaro (LQ9 - L4 - TBI) - 2.4 Liter -- 4 speed Manual -- Sold -1983 Recaro Trans Am T-Top (LG4 - V8 - 4bbl) 5.0 Liter -- (MM4) 4 speed Manual -- Sold Swaped in 383 Stroker with Holly 4bbl. T5 Borg-Warner Trans. -1988 Camaro (LB8 - V6 - MPI) 2.8 Liter -- 4 Speed Automatic with O.D. -- Sold -1989 Pontiac Firebird (LB8 - V6 - MPFI) 2.8 Liter 700R4 Auto -- Sold |
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Mar 19 2008, 03:59 PM
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#2
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 Fabricator Group: Members Posts: 1,619 Joined: 31-July 07 From: Bastrop Member No.: 272 |
  I'll be doing the same thing in a couple of months and need all the info/help I can get on this too. -------------------- Not alot of people can point at something and say, "I built that."
 1991 W68 Firebird.... 355 TBI/WC T-5/ 9 Bolt 3.27 Posi w/PBR's, Edlebrock headers, MSD ignition, 9.8:1 compression, hypereutectic pistons, HD rods, ported and polished 305 heads with cut pockets, Competition Cam 211/221 @ .050 110 lobe separation, port and gasket matched intake/heads, 3" stainless Hooker Aero Chamber cat-back, complete WS6 conversion, open element, energy suspension poly bushings throughout, complete A.I.R. delete, 8mm wires, 165* stat, 4th gen T/A wing, all black leather 4th gen interior, 4th gen center console, custom circle grid T/A tail lights, Sequential turn signals.  1989 Plain Jane Firebird....2.8/700R4/peg leg 3.42 with one-off steel heat extractor hood and polished 20 slot wheels. |
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Mar 19 2008, 04:14 PM
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#3
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ATGO Yapper Group: Members Posts: 977 Joined: 22-February 08 From: North Austin Member No.: 336 |
MOOCH!
Its  Your not allowed In this thred! MUAHAHAHAHHA
-------------------- --1991 Camaro RS Convertible-- (LO3 - V8 - TBI) 5.0 Liter - Borg-Warner T5 Manual - Performance Chip--
--Current Project- 1997 SS Camaro LT1 & T56 for my 91 Vert-- Previous 3rd gen's: -1982 Camaro (LQ9 - L4 - TBI) - 2.4 Liter -- 4 speed Manual -- Sold -1983 Recaro Trans Am T-Top (LG4 - V8 - 4bbl) 5.0 Liter -- (MM4) 4 speed Manual -- Sold Swaped in 383 Stroker with Holly 4bbl. T5 Borg-Warner Trans. -1988 Camaro (LB8 - V6 - MPI) 2.8 Liter -- 4 Speed Automatic with O.D. -- Sold -1989 Pontiac Firebird (LB8 - V6 - MPFI) 2.8 Liter 700R4 Auto -- Sold |
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Mar 19 2008, 04:47 PM
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#4
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ATGO Addict Group: Administrators Posts: 3,799 Joined: -- From: South Austin Member No.: 78 
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Thirdgen.org has alot of good info for TBI engine upgrades.
To tune a TBI you need to get a chip burned Theres someone who does them pretty close to town i just dont remember..ill try to find out. Or i believe someone on here has the stuff to tune chips and shit. What type of heads and intake were you thinking..and if you get too powerful you can upgrade to either a 5.7 tbi unit or a 454 tbi unit would be the best. --------------------  |
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Mar 19 2008, 04:47 PM
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#5
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 ATGO Addict Group: Members Posts: 1,325 Joined: -- From: Pflugerville Member No.: 82 
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Several folks on the board have the equipment to tune your car. It involves modification of the lookup tables on the PROM to accommodate any modifications you have made that increase/decrease the engine's volumetric efficiency.
A wide-band O2 sensor and a data logger will give you the information you need to tune effectively. Failing that, you can do what most do and just turn everything up and act like you tuned. ;-) -------------------- 1991 Pontiac GTA, 350 Auto
314 RWHP - 397 Lb. Ft. RWT Best 1/4 Mile, 12.8165@107.58MPH Wayne Harlow Pflugervile Texas Nowhere BUT Texas... "Don't argue with idiots. They'll drag you down to their level and beat you with experience." The fact that a bunch of idiots stand in agreement doesn't change the fact that they are just a bunch of idiots. "Against every great and noble endeavor stand a million mediocre minds" Albert Einstein "Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end." |
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Mar 19 2008, 05:11 PM
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#6
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Fabricator Group: Members Posts: 1,619 Joined: 31-July 07 From: Bastrop Member No.: 272 |
QUOTE(TexasSilhouette @ Mar 19 2008, 03:47 PM)  Several folks on the board have the equipment to tune your car. It involves modification of the lookup tables on the PROM to accommodate any modifications you have made that increase/decrease the engine's volumetric efficiency. A wide-band O2 sensor and a data logger will give you the information you need to tune effectively. Failing that, you can do what most do and just turn everything up and act like you tuned. ;-) Where would one be able to find the lookup tables? I don't know about Randy, but I'm probably going to stick with the stock heads and just add an LT1 cam, and do all the ultimate TBI mods on TGO. Another question....I was told I needed a UV light to erase my chip so it can reburned since I changed from auto to manual trans. Where do I get this UV light? Would a UVB heat lamp from the pet store work? -------------------- Not alot of people can point at something and say, "I built that."
1991 W68 Firebird.... 355 TBI/WC T-5/ 9 Bolt 3.27 Posi w/PBR's, Edlebrock headers, MSD ignition, 9.8:1 compression, hypereutectic pistons, HD rods, ported and polished 305 heads with cut pockets, Competition Cam 211/221 @ .050 110 lobe separation, port and gasket matched intake/heads, 3" stainless Hooker Aero Chamber cat-back, complete WS6 conversion, open element, energy suspension poly bushings throughout, complete A.I.R. delete, 8mm wires, 165* stat, 4th gen T/A wing, all black leather 4th gen interior, 4th gen center console, custom circle grid T/A tail lights, Sequential turn signals. 1989 Plain Jane Firebird....2.8/700R4/peg leg 3.42 with one-off steel heat extractor hood and polished 20 slot wheels. |
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Mar 19 2008, 05:11 PM
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#7
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ATGO Yapper Group: Members Posts: 977 Joined: 22-February 08 From: North Austin Member No.: 336 |
QUOTE(TexasSilhouette @ Mar 19 2008, 05:47 PM) Several folks on the board have the equipment to tune your car. It involves modification of the lookup tables on the PROM to accommodate any modifications you have made that increase/decrease the engine's volumetric efficiency. A wide-band O2 sensor and a data logger will give you the information you need to tune effectively. Failing that, you can do what most do and just turn everything up and act like you tuned. ;-) SWEET, When all else fails.. CRANK IT UP! 
-------------------- --1991 Camaro RS Convertible-- (LO3 - V8 - TBI) 5.0 Liter - Borg-Warner T5 Manual - Performance Chip--
--Current Project- 1997 SS Camaro LT1 & T56 for my 91 Vert-- Previous 3rd gen's: -1982 Camaro (LQ9 - L4 - TBI) - 2.4 Liter -- 4 speed Manual -- Sold -1983 Recaro Trans Am T-Top (LG4 - V8 - 4bbl) 5.0 Liter -- (MM4) 4 speed Manual -- Sold Swaped in 383 Stroker with Holly 4bbl. T5 Borg-Warner Trans. -1988 Camaro (LB8 - V6 - MPI) 2.8 Liter -- 4 Speed Automatic with O.D. -- Sold -1989 Pontiac Firebird (LB8 - V6 - MPFI) 2.8 Liter 700R4 Auto -- Sold |
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Mar 19 2008, 05:19 PM
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#8
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ATGO Yapper Group: Members Posts: 977 Joined: 22-February 08 From: North Austin Member No.: 336 |
I have not decided What heads or intake or TB to use yet. I was actuly considering going with Vortec but I dont know enough about it all yet to make any desions yet. IF at all possable i'd like to stick with the 305 and still make an attempt at staying at or above 20MPG... thats my only reason for not swtiching over to the 350, simpy fule milage. I just want a good Strong motor that will Run a ALONG time. I dont wanna do the repair/rebuild/replace thing on this car every wekend to keep it running. Only thing i'm looking to do with this motor that its lackin now, is put in a slightly more beefy cam. Nothing stuipdly redicouls but a Medium cam woudl probly give me the push from that engin i'm looking for. Anyting woudl be better than that Flat NO lobe having rod they put in as a stock cam.
 I'm still doing the research to find out more stuff on this.. If it looks like i'm going to go way below 20 mpg. then i'm proby just going to end up leaving it all stock. and settling with that. This is why i was wondering about Tuneing.. I dont knwo how much MPG you can squese out of one of these TBI's and how much you can tune them and all that. -Randy- -------------------- --1991 Camaro RS Convertible-- (LO3 - V8 - TBI) 5.0 Liter - Borg-Warner T5 Manual - Performance Chip--
--Current Project- 1997 SS Camaro LT1 & T56 for my 91 Vert-- Previous 3rd gen's: -1982 Camaro (LQ9 - L4 - TBI) - 2.4 Liter -- 4 speed Manual -- Sold -1983 Recaro Trans Am T-Top (LG4 - V8 - 4bbl) 5.0 Liter -- (MM4) 4 speed Manual -- Sold Swaped in 383 Stroker with Holly 4bbl. T5 Borg-Warner Trans. -1988 Camaro (LB8 - V6 - MPI) 2.8 Liter -- 4 Speed Automatic with O.D. -- Sold -1989 Pontiac Firebird (LB8 - V6 - MPFI) 2.8 Liter 700R4 Auto -- Sold |
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