turbo build questions - Third Generation F-Body Message Boards

Seanmay1 · 10-07-2009, 09:30 PM

well im about to start buying the parts to build my turbo set up and have a few questions. Also im still debating on rear mount single turbo or twin turbo mounted at the motor.

But my car is MAF, can i run the mass air sensor after the turbo close to the throttle body like it is now or would it have to be before turbo? and if i run twin turbos how would i do the MAF? For now this setup will be going on my 305 with low boost probably only 5lbs. Once i get it all worked out and learn to tune it i will be switching to a 350 with forged internals and crank the boost up. So will the 19 lb injectors be able to keep up? if not what would i need

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Camarslow · 10-08-2009, 02:01 AM

The MAF should go between your BOV and the throttle body.

noboostnogo · 10-08-2009, 10:47 AM

here is a thread i started about 2 years ago, i asked the same question
http://www.thirdgen.org/techboard/po...gle-turbo.html (My First Single Turbo Tpi setup, need advice please!)

hope this helps

noboostnogo · 10-08-2009, 10:50 AM

Quote:

Originally Posted by Seanmay1

.... So will the 19 lb injectors be able to keep up? if not what would i need

no 19lb injectors will starve a n/a 350, i dont even want to imagine how bad it would be with boost. you will need 30+lb injectors at least, just remember boost is verryyyyyyyyy addictive and you will want more and more so just get some that you can use for a while. whats ur hp goal?

Seanmay1 · 10-08-2009, 01:01 PM

thanks for the responses guys right now i dont have a HP goal just trying to get everything set up and learn all this turbo stuff. Even if i build a 350 that can handle a lot of boost i wont be able to play with it until i get another transmission. I doubt the T5 would handle it if i get on it hard, so until i can afford a TKO600 i wont make any real power. So either way im not gonna go over 5lbs of boost anytime soon. I have some 30lb injectors from a Grand national i could throw in for now also

Also i have a friend with a fast grand national thats going to help me build it. Goal is to have everything on the car in one day lol. Then spend a month tuning it. Just going to use exhaust pipe to run everything back up to the throttle body will that work? I work at a shop so bending the pipe is no problem i think that will be the easiest thing to use

Seanmay1 · 10-08-2009, 01:27 PM

has anyone used these? http://stores.ebstores.us/items/item.aspx?itemid=5308906
says they are for a truck but i think they might work

noboostnogo · 10-08-2009, 09:50 PM

those manifolds will never clear a third gen hood idc what kind of hood it is they just wont fit.

As far as the cold side goes you could use exhaust pipes but unless you guys have a mandrel bending machine i personally wouldnt bother. Crushed elbows or wrinkled pipes look bad and kill performance. You could get a intercooler piping kit on ebay for cheap. everyone including myself have had great succes with them.

Seanmay1 · 10-08-2009, 10:41 PM

Unfortunately no mandrel bend machine so I will check out the intercooler pipe kits. After actually looking at the manifolds and my car i already figured out they wont work. Thinking now about going with a single turbo mounted where the battery is on the drivers side. Hell with the rear mount and running that much tubing and oil lines and the oil pump i think that will be to much of a hassle. I would rather fight with getting the pipes ran around the motor.

Got any recommendations for a cheap turbo, waste gate, bov? Not gonna run a lot of boost so wont need a big turbo anytime soon. Was thinking about the cheap T70 on ebay for around $180

ZZ3Astro · 10-08-2009, 11:48 PM

I'm using an EBay T70 and it has been great so far. I've put about 250-300 miles on it so far and plenty of abuse. For tubing you can just order mandrel bends online or locally from a heavy duty/diesel truck parts/supply house. Find a chopsaw at a pawn shop and borrow a mig welder to tack everything together as you progress Once you get the various pieces fit together the way you want them, bring them to a friend that welds (or better yet yourself if you can weld) and tig them together.

Since you have a Firebird, the battery is on the driver side I think. if so, all you have to do is move the fuel vapor cannister and you have a good location for the turbo. It would be much easier to have it on the passenger side because of the existing location of the exhaust pipe routing and you can cheat and use the fuel pump blockoff plate as an oil return (at least until you change engines and then put it where it should be - directly into the pan)

Seanmay1 · 10-09-2009, 07:23 PM

Wouldnt the AC compressor and lines be in the way on the passenger side? I can weld the pipes up at my job on weekends and we have a chop saw so all of that will be no problem. I know there will be a little more problems getting the pipes ran with it on the drivers side, but i was thinking then i wouldnt have any problems with my AC.

Do you have any pics of your setup?

noboostnogo · 10-10-2009, 09:29 AM

Quote:

Originally Posted by Seanmay1

... Was thinking about the cheap T70 on ebay for around $180

verry verry bad idea. do a search on "ebay t70" you will find the answer why. and plus those are false advertised, they are alot smaller than a real t70 too small for a 350. For the turbo just look on the classified section and see if any members are selling any good trusted units for a good price or look into the master power t70. If you plan on sticking with the 305 you can get away with the .6x somethin housing but for the 350 or 355 the .96 housing will be more suitable. Another good option for the 350 would be a borq warner s400 with t4 housing or t6 if you want more power.
50mm BOV no doubt and 38mm+ wastegate. Dont think that boosting our cars is gonna be cheap and easy to do. It will take some creativity, time and money. Its a great journey to go throught just dont rush it and do it right the first time.