nezzie09

I have an old turbo from a Saab. And want to put it on my 2.8 mfi.
Can anyone tell me what I'll need? Obviously a way to work the exhaust to the turbo, then to intake, but what else needs to be done? Can the engine handle 5 psi of boost? How do I ensure it's only at 5 psi? Also can the turbo just be installed on one side? In other words only being pushed by 3 cylinders?

firebird1992

there's a sticky about this https://www.thirdgen.org/forums/v6/3...ing-turbo.html

nezzie09

Thanks

project89

iTrader: (1)

i wrote that thread a long time ao and some of the info is outdated and a lil confusing, not to mention a few pics are missing.

so if u have any questions just ask in that thread and i or others will reply and be able to help u out


one of these days i will reoganize my pics and re write the entire thread all over

btw is the turbo u have off an older sabb or a newer one the newer saabs use very small gt17 turbos and wont do a whole lot for you

nezzie09

It's an older Saab. I understand the basics, however, if I'm only running 5-7 psi of boost will my injectors be ok and my tuning?

Project 3.4 Camaro

I may be wrong, but I doubt it, you will probably need tuning and either 17 or 19 #/hr injectors. Also I think it's less than ideal to run injectors at their max capacity, I seem to remember reading something that suggested not so great mileage when overworking them with no headroom or something like that. But project 89 can answer better than I, you want to talk N/A come to me, but for turbocharging hes your man,lol.

chvy

No man, you can't put a turbo off one bank and have it feed both, it might be a good idea to check out a book on turbos or forced induction at the local library. They have these books at bookstores or online also... get a little information on what you're looking into first.

I've run injectors at 130% duty cycle, even though this isn't 'possible' in reality (I have the datalogs to prove it), but higher fuel pressures will give rise to higher duty cycles, some computer systems can adjust for a little more air intake, some can't. This was in a 4.3 with a newer operating system and tuning software. Some ECM's and injectors max out at 100% duty cycle, others can go more. In any case it's not safe or reliable to go much over 80% which most injectors max out on stock engines. 5psi should be fine with stock injectors, but it isn't ideal. Like I said though, it could starve at 3psi or 8psi, dunno, I'm not too familiar with these engines

Keep your stock injectors and computer. Get the setup in good tune (AFR's, intake temps, and timing are most important) to as much as it'll run with the stock injectors. If/when you run out of fuel, do the oldschool fix with an SDS EIC and you're good to go, no computer calibrating for larger injectors, just wire it up, tune, and go.

The cheapest fix is an fmu, where it's possible to get the amount of fuel you need for a nice unit that costs 80+$... but I'd stay as far away from those as possible

project89

iTrader: (1)

no stock injectors will max around 3 psi, oto the junkyard and pick up a set of 19 or 21# injectors they will only cost u a few bucks.

ok the new saab turbos are gt17's which are really small the turbo u have should be a t3 45 trim which will be good for around 240 ish hp, any chance u can post a picture of it, this is what my old pair of saab turbos looked like


a way to think about injector sizing is this ( its crude but gets u a good baseline

every 10 pounds of flow an injector has is good for right around 100 hp on a turbo charged engine i.e

15# stockers = 150 hp crank
19# = 190 hp
21#= 210 hp
24# = 240 hp
36.6# = 360 hp
42# = 420 hp

etc etc etc

btw that is using stock fuel presure by bumping up the fuel presure u can increase the flow threw the injector

Project 3.4 Camaro

I don't suppose the same rule of thumb applies to N/A engines?

project89

iTrader: (1)

on an n/a engine they will support something like 15-20% more