WickedCrazy

So after much deliberation Im not going to be switching my 305 tbi to tpi. Instead to get me by until I eventually do an engine swap I want to mess around with my 305. What I'm thinking is: Full exhaust overhaul shorties with true duel, LT1 cam, and porting my 305 tpi heads and installing them, and 3.43 gears in the back. Car already has a TPI pump in the back so thats done at least, and the stock air filter is gone as well. What do you think? Should I do something differently or add anything? Don't really have any hp/tq goals in mind just something with a little more get up and go I guess.

camaronewbie

Cam. exhaust, and headwork will require custom chip tune, and you'll need to address the intake as it's restrictive as well.

Personally ... having been there and done that, I'd pass on anything done to the 305 that cannot to swapped to the 'next engine' in mind, and save that trouble/funds for that 'next engine'.

WickedCrazy

Thats why Im thinking of doing said mods, headers and back will swap more then likely to a 350 sbc that I may end up dropping in, and the Cam too, the heads I already have so thats no biggy. So really all Im looking at having to buy is the LT1 cam and exhaust pipe, but even then both of those will transfer over if I want to

UnderCover89TBI

iTrader: (25)

if that's what you wanna do then do it

NagleMac

iTrader: (1)

You're gonna have to get your chip custom tuned and maybe some better injectors to get the most power out of that, but those would be the best mods to do, and I'd suggest an open element air cleaner to go with that, but no matter how many times people say "just get a 350" those mods you said can make a 305 less of a cruiser, but camaronewbie is right, if you get parts that can transfer to a 350, then you'll be saving time and money if you ever do swap a 350 in

NagleMac

iTrader: (1)

Words of wisdom

UnderCover89TBI

iTrader: (25)

well he asks and then goes against. So if its your car. do what you want. when you do it if you need a tune. you'll find out. and then you'll be on to the tuning part. I dont mean to come across as a jerk or anything.

NagleMac

iTrader: (1)

You didn't come across as a jerk, I was serious about what I said, he shouldnt listen to people that say "just put a 350 in" or "you're wasting your time with a 305" because like you said, if he wants to do it, then he should do it, and I agree with every mod he said, I'd rather just mod my 305 instead of buying a 350 and going through a whole rebuild and swap process

UnderCover89TBI

iTrader: (25)

well it really depends on your goals. but its not like he said he is going to completely rebuild the 305 and all that.

NagleMac

iTrader: (1)

True

WickedCrazy

Ya Im going to eventually swap a 350 in but Im still not sure of what path Im going to take with it. So I might as well make my little 305 as much fun as I can. What I am curious on tho is how hard is the tuning side of things?

And NagleMac, ya ive already got an open element on it. Did that on day one of buying it cuz I hated the stupid bird that was painted on it.

And ya Im sorry for all the different threads on what to drop in, Im very indecisive about what I want to drop into the car at this moment. I change my mind probably every 2 hours as to what engine to drop in. Everything from a Blown 327 to a N/A BB all in one day! I even thought about buying an SR20 from a buddy that picked 2 up from Japan!

NagleMac

iTrader: (1)

Good choice with the open element, and tuning is not hard at all, you have 3 options (in order from worst to best) buy a performance chip, buy a do-it-yourself programmer, or just send your chip go a company who can custom burn it to get the most power out of your mods, none of the three are that expensive, but the 3rd option will definitely give you the most power from your mods

WickedCrazy

Oh ok Im glad I asked I was not aware that I could send my chip away to have it done! I was going to get the thing to do it myself. If I can send it away that makes much more sense to me, ha. What are the name of these places?

UnderCover89TBI

iTrader: (25)

well IMO buying the EBL flash is the most cost effective. because you'd pay for a chip for a 305. then you'd have to repay for a chip for a 350 later on. and to get a completely custom tuned chip is 300 bucks or more. Where the EBL flash, where you can tune yourself over and over and over again is 350.00 for the basically self install kit

NagleMac

iTrader: (1)

I'm not sure of the names except for fastchip.com which said $159 for a 91 camaro 305 (my car) and undercover is right, you would need to buy another chip, didn't really think about that

UnderCover89TBI

iTrader: (25)

You will learn my apprentice

NagleMac

iTrader: (1)

I'm trying to learn haha my constantly broken camaro is helping me

Ronny

iTrader: (1)

Rather than TPI have you considered a port fueled single plane EFI manifold(Profession products is lower cost than Edel or Holley)?

TPI has its disadvantages...

UnderCover89TBI

iTrader: (25)

I agree. Straight TBI is limited. TPI is deffinately limited too. What Ronny means is kind of like TBI but the throttle body will only be introducing air, with an injector in the intake runner of every manifold port injecting the fuel. its a better design, and something that coule be in my future in a few years.

WickedCrazy

How much does such system put a guy back?

Ronny

iTrader: (1)

It is not a "system" so to speak. It is an alternative to TPI. actually there are several alternatives to TPI. Stealth Ram, Mini Ram, Super Ram, Edelbrock, Fast, the list goes on and on. If one wants port injection and the most economical, out side of a salvage yard TPI, then a single plane efi intake should get you there with max performance without limitations of TP.
You will need:
Pro products manifold
fuel rails + plumbing
injectors
wire harness
Throttle body. you can adapt a TBI TB. Just remove the pod and injectors. GM 7.4L will give you the flow needed. Or utilize a LS TB with a neck adapter.

robertfrank

iTrader: (27)

Wow, this question HAS to pop up at least twice a week,lol. Just read my cardomain in my sig. Pretty much have all your questions covered there.

jmm70

I recently swapped my 305 out for another 305 motor. When doing this, I had to bore the block .40 over and I simply replaced everything with factory parts except the cam. The cam has the following specs: .462 intake, .470 exhaust with a .110 centerline. This is running on a factory TBI setup. The motor at idle is stalling out and lagging at low rpms. I'm not the most car savvy individual and need to get the car running properly. The car at idle sounds close to factory, but I was told the .110 centerline and TBI are not very friendly together.

Should I call someone and give them these specs to burn a chip, take it a shop (i.e. Precision Tune), or just hang it up?

I currently reside in Pensacola, Florida and need to see if anyone knows of a local shop who can tune a fuel injected 1991 Pontiac Firebird. Any help would be greatly appreciated.

UnderCover89TBI

iTrader: (25)

deffiantely going to need a custom tune and with that cam fuel injection engines like more of a 112-114 it may be difficult. your timing will also affect the way it runs. But deffiantely sounds like you need a custom tune

jmm70

So where could I go to get a custom tune? What would be better online or a local shop? I don't know of any local shops in Pensacola and I have called almost everyone in the Phone book...

Could I call Hawk's Third Gen with my specs and they can make a chip?

Could I go to a local Precision Tune and have them tune it?

UnderCover89TBI

iTrader: (25)

I dont know if precision tune can do it. you'd have to ask them.

You can call tbichips.com and have them do one for you. but it will take many trys without datalogging.

you can order an EBL flash system from dynamicefi.com and try to do it yourself.

That is all I got for ya.

NagleMac

iTrader: (1)

Wouldn't you need pistons that were oversized .40? Or am I totally confused about what bore means?

UnderCover89TBI

iTrader: (25)

if it was bored .040 over he would need pistons that are .040 wider as well. im assuming he did that. if he put stock pistons then he is in store for a smoker and a baaaaaad running engine

naval_ned

Another spot to check is tbichips.com. Not sure how much they charge though.

NagleMac

iTrader: (1)

He said he used all the stock parts, wouldnt loss of all that compression cause stalling?

UnderCover89TBI

iTrader: (25)

well you need fuel, spark, and compression to make an internal combustion chamber engine run. but compression isnt going to be there then go away to make it stall out. IMO.

jmm70

I do have the block bored .40 and pistons to match that. Sorry for the confusion. I thought about using Hawks Third Gen Parts. They have a peggy back style chip they customize for 3rd gen f-bodies.

NagleMac

iTrader: (1)

That's true but I was thinking when you needed more power (pushing the gas pedal) that it would stall from losing all the compression, im not good with cars tho, so that's just an assumption

jmm70

Would getting a customer PROM be a better alternative than simply mechanically changing the spark, the fuel input, and the timing?

The big quesiton is should I try fixing my issues mechanically first? And then if that does not work use the custom PROM?

Sorry to ask so many questions but you guys seem like you know what you are talking about more than anyone else in my local area. Thanks again for all of your help.

NagleMac

iTrader: (1)

Personally, I'd do both, even if just fixing the mechanical issues work, you arent goin to get your money's worth out of those mods with out getting your chip tuned, no matter what way you tune it, so I would do mechanical fixes first and then even if it works or not, get it tuned

UnderCover89TBI

iTrader: (25)

deffinately wanna make sure all the mechanical stuff is intact and in good condition before you put any money into the tuning. which youll need.

jmm70

Once it is tuned mechanically, should I attempt to data log and burn my own chip. Or would I have better luck sending my engine specs out to a vendor to make a chip for me. I have no experience with tuning, data logging, etc.

I am willing to attempt it if the task is simple enough. If data logging is the best method, what all would I need to begin data logging and tuning a chip for my car?

Thanks again guys for all of your knowledge. I have already learned a lot from you all.

UnderCover89TBI

iTrader: (25)

do a thier is a DIY tuning board on this site that will have all these answers for you.

thomas1976

I had done this (with stock heads) to the original LO3 that came in my car, was a good experience, with your ported 081 should be even more fun.

The car was way better tuned, speaking performance, with my DIY EBL tune (off course 90% of imput came from TGO) then with the coustom chip.

Considering the fueling moods it requires, I would suggest nothing less then EBL, if you keep TBI or go TPI.

jmm70

So I have double checked everything mechanically and everything seems as good as it is going to be without tuning the computer itself. The fuel and idle are both definately off with this big cam and I need to get this fixed within the next month.

Is setting up the dynamic efi difficult? How long does the install itself typically take? I know tuning is where most of the time is spent but was curious as to the install itself.

Thanks again guys for all of your help.

Ronny

iTrader: (1)

go to dynamicefi.com and click intro to tuning part 2. part 1 is for use of tunerpro as well as datalogging with EBL whats up. part 2 is making changes day one and after. It is a speed density system(MAP).

UnderCover89TBI

iTrader: (25)

yeah im going thru the dynamicefi.com stuff right now im at information overload and therefore lost! but im sure i'll "get it" soon. combine an idiot with a computer, then add another computer in the car and ahhhh haha.