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PROM, not the dance Posted By: roubenbird On: 12-31-2007 @ 15:16:45 Reply | Edit Where is a good place to get a prom burnt? I have a bit done to the car but feel it should be faster and run a little better. and better fuel economy to boot. I have basically all stock components from different motors with the exception of holley intake/TB/injectors, roller rockers, and headers. i know that she runs rich and i only get about 14 mpg, its a 305 so i would really likehigh teens adn think that should be attainable. any suggestions to where i can give my specs and get a good chip, at a reasonable price, im not looking dirt cheap but i also cannot afford a $600 prom or tune, yet. -- 
WS6 3o5 TBI 88' Formula, 670cfm Holley Projection Throttle Body Holley Projection Intake Mainfold, Underdrive Pulley,Dual Snorkle & Factory Cowl Induction now with short straight pipes, UMI Subframe connectors, Fourth Gen seats, Three row Radiator, Posi rear end (2.73) 15.543 @ 88.21mph Posted By: useful_idi0t On: 05-15-2007 @ 17:39:08 Reply | Top | Edit im pretty sure pcmforless does tbi tunes now, check with them and madz28. on a side note my old TBI formula and t/a (88 and 89) were getting around 20 21 mpg mixed so i dont think the problem is the tune, if anything i would think that the headers and straight pipes would of leaned it out. all the sensors functioning properly and clean? --  Posted By: 84SEBird On: 05-15-2007 @ 22:10:52 Reply | Top | Edit If I remember correctly there is a place called tbichips.com that does this kind of work. It's good to see your car back on the road reguardless of gas mileage! -- Brad 1984 Firebird SE- cream-beige- the prestige color! 
1987 Corvette Posted By: Green97TAMachine On: 05-16-2007 @ 01:14:10 Reply | Top | Edit http://www.moates.net/ -- 1997 Mystic Teal Trans Am, M6, Leather, Hardtop. TB Bypass, CAI, Pacesetter LT's, Flowmaster 80 Series !CATS, !AIR/E.G.R., !CAGS, And a PCM tune done by Thunder Racing.  Posted By: Bruzer On: 05-16-2007 @ 08:58:21 Reply | Top | Edit well i cant think of it off the top of my head the brand name but in my Year One catalog had about every chip created for a 1982-92 f-body and they werent that exspensive. -- 1986 Firebird 305,4bbl Edelbrock,w/5sp 1982 Z28 Pace car, 
 Posted By: roubenbird On: 05-16-2007 @ 16:32:21 Reply | Top | Edit useful, it really wen down when i got the Holley projection unit(s) i have 350 injectors that are rated at like 60 gph or something really high for my motor. when i put that on i dropped from like ~19/20 to ~11/12. ever since then, all the other mods i've made slightly increased economy so now im up to about 14.... sigh --
WS6 3o5 TBI 88' Formula, 670cfm Holley Projection Throttle Body Holley Projection Intake Mainfold, Underdrive Pulley,Dual Snorkle & Factory Cowl Induction now with short straight pipes, UMI Subframe connectors, Fourth Gen seats, Three row Radiator, Posi rear end (2.73),TPI heads, 1.6 roller rockers 15.543 @ 88.21mph Posted By: useful_idi0t On: 05-16-2007 @ 18:53:14 Reply | Top | Edit well if you plan on keeping the 350 injectors then youll probably need a custom tune for it, but seeing as how your mods arent heavily relying on more fuel, it might be cheaper to just get a set of 305 injectors. you might even see a performance and driveability increase if you swap them out. just a thought. --  Posted By: Remdog On: 05-16-2007 @ 21:33:56 Reply | Top | Edit that holley projection sounds awesome i need that one for my 350 what the part# roubenbird? Posted By: roubenbird On: 05-16-2007 @ 23:38:37 Reply | Top | Edit okay, but you cannot get injectors that have a lower flow rate that size, you should see these monsters. besides, i've looked everywhere, i have these GP Sorson name brand or something like that injectors. i've upped the pressure to sorta lean things out but the prom controls the injector pulse and from what i've heard on other boards, the prom cannot lean out the ratio a whole lot, it mainly makes it richer to avoid detonation, so i've heard it's easy to "max" out the leanness so to speak. a common problem with the projection series on a 305... Remdog, no you dont. the system doesnt really fit and only gives slight performace gains. and i dont remember the part numbers. lol --
WS6 3o5 TBI 88' Formula, 670cfm Holley Projection Throttle Body Holley Projection Intake Mainfold, Underdrive Pulley,Dual Snorkle & Factory Cowl Induction now with short straight pipes, UMI Subframe connectors, Fourth Gen seats, Three row Radiator, Posi rear end (2.73),TPI heads, 1.6 roller rockers 15.543 @ 88.21mph Posted By: useful_idi0t On: 05-17-2007 @ 18:10:46 Reply | Top | Edit remdog, look in the truck section of a jegs or summit catalog, there usually there, but they really arent worth the money, the stock tbi will support more than 300hp, and you can take it to a shop and have them bore out the throttle barrels for half of what the holly ones run. ben, if your using 350 injectors, you can run 305 injectors, theyre the same physical size, but if your sure that it wont solve your rich situation, then get a tune. -- Posted By: Remdog On: 05-17-2007 @ 21:53:55 Reply | Top | Edit my motor makes 400hp 425 ftp Posted By: useful_idi0t On: 05-17-2007 @ 22:11:00 Reply | Top | Edit thats pretty high for a tbi, how did you get to that point? im not trying to bust your chops im genuinely curious, not many people go that far with a TBI system. -- Posted By: roubenbird On: 05-17-2007 @ 22:47:46 Reply | Top | Edit well it's been a few years since ive looked, but there was nothing that flowed that low that would fit the TB at that time i could find. they are different size than stcok. thanks for the input --
WS6 3o5 TBI 88' Formula, 670cfm Holley Projection Throttle Body Holley Projection Intake Mainfold, Underdrive Pulley,Dual Snorkle & Factory Cowl Induction,now with short straight pipes, UMI Subframe connectors, Fourth Gen seats, Three row Radiator, Posi rear end (2.73),TPI heads, 1.6 roller rockers 15.543 @ 88.21mph Posted By: Green97TAMachine On: 05-18-2007 @ 10:27:11 Reply | Top | Edit I'm with useful...The highest I've ever seen 2-bbl TBI achive is 375hp. Even then it took tons of tuning and tweaking. I'm pretty sure that due to both fuel and air flow restrictions, 2-bbl TBI is only physically capable of 375-400hp. There are only a handfull of people who have even hit the 350hp mark with 2-bbl TBI over on Thirdgen.org, and even then....the amount of tuning that had to be done is enough to turn your hair grey! Also, with TBI....a mail order tune is not a great investment. Your best bet is to find someone with the knowledge and equipment who is willing to teach you and or tune the car for you. There's a TON of trial and error with PROM tuning and it differs greatly from car to car being that there really is no 2 3rd gens the same anymore. -- 1997 Mystic Teal Trans Am, M6, Leather, Hardtop. TB Bypass, CAI, Pacesetter LT's, Flowmaster 80 Series !CATS, !AIR/E.G.R., !CAGS, And a PCM tune done by Thunder Racing. Posted By: useful_idi0t On: 05-18-2007 @ 18:23:15 Reply | Top | Edit josh, the real limit to tbi is the injectors, they max out a little after 400hp (and thats the 454 injectors too). the stock tb will flow around 550cfm iirc, and theres plenty of 500hp cars with 650cfm carbs on them. and on the self tuning note, thats why i never got really serious in tbi tuning, too much cost involved, too much soldering, and too much time for not a whole lot of performance in the end. -- Posted By: Green97TAMachine On: 05-18-2007 @ 22:51:54 Reply | Top | Edit Jared, If memory serves me, the stock 305 TBI unit itself flows little more than 400cfm. I think you're thinking of the TBI that GM used on the 454 trucks and they were capable of 550-600cfm. That being said, you're right about the injectors being the major issue. The 305's came with either 50 or 55lb/hr injectors and the 454's had 65lb/hr's. Even then, having the Holly 670cfm unit and the delphi (again, if I remember correctly) 90lb/hr injectors...that setup would still max at about 400-425hp, again due to injectors and the extreme tuning that would be required. I'm not disagreeing with you....just adding some of the things I remember as I go  -- 1997 Mystic Teal Trans Am, M6, Leather, Hardtop. TB Bypass, CAI, Pacesetter LT's, Flowmaster 80 Series !CATS, !AIR/E.G.R., !CAGS, And a PCM tune done by Thunder Racing. Posted By: useful_idi0t On: 05-21-2007 @ 17:48:41 Reply | Top | Edit thanks for the refresher course josh, its been awhile since i was on TGO trying to become the TBI god  -- Posted By: Green97TAMachine On: 05-22-2007 @ 02:00:57 Reply | Top | Edit  Ahhhh, the good old days!-- 1997 Mystic Teal Trans Am, M6, Leather, Hardtop. TB Bypass, CAI, Pacesetter LT's, Flowmaster 80 Series !CATS, !AIR/E.G.R., !CAGS, And a PCM tune done by Thunder Racing. Posted By: useful_idi0t On: 05-22-2007 @ 20:47:51 Reply | Top | Edit no shit, even though from a performance standpoint tbi sucks, its one of the most goddamn reliable forms of fuel injection ever. --
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