Hey everyone.

First off all, dont flame about the 305, im well aware that theses engines are Said to be under-acheivers, but i dont really care.

I like the idea of:
1. Being unique
2. Proving these engines can make some power
3. Laughing and telling people they got spanked by a 305.

Anyways.

Ive gone through all kinds of different builds i can do, but what i would like to get out of the engine is:

The ability for it to handle 5 - 7psi boost regularily, 10psi at the strip on weekends.

Im looking into these headers:

http://cgi.ebay.ca/SBC-SB-CAMARO-FIR...QQcmdZViewItem

And i will create the rest of the exhaust myself.

The block is an 89 Roller block, 7.736 bore.
I am using coverted LT1 heads, and the LT1 intake, so the turbo set up is based off a TPI style induction system.

Engine basics:

Speed Pro Hypereutectic pistons w/ low friction coated skirts
LT4 Rods w/ ARP Bolts
Stock crank, with ARP Main bolts, Or if stock crank is not sufficient, i have been eyeing up the Eagle Cast steel 1pc crank.
I will need help picking a cam, but the heads have ARP thread in studs, Comp beehive springs, and stainless valves.
Fuel system will be the stock TPI fuel pump, 24lb injectors.

Do you guys feel this can stand up to a turbo?

I would like to have it set up as a twin mini-turbo, preferrably intercooled, or a larger single turbo. Both trays, up front (battery, and carcoal canister) are clear, and there is room up ther for turbo mounts.

My goal is to get 400hp at the fly wheel.

Dont know what cam to use as i said. I would use dished pistons to keep compression ratio down.

Thanks for hte help!

Sheldon

 

a stock 305 could handle the boost levels your talking about. So I think you will be just fine wiith what you said above..

Few things id change up.
1. why not just go with a forged piston and skip the hypers. Yes they (hypers) are strong but they are brittle none the less. As for dish I belive most Lt1 setups are avaliable in a -22cc dish.

2. STAY AWAY form those headers you pointed out. Give me another month at the most and I will have a Single setup avaliable F/S. Possab. a twin also.

If you go for twins find T3's form the GN/Turbo coupes
If you go single You could use a HX35 or 40

Can Id call comp or someone and give em your spec's on everything one you deside what your gonna settle with. What gears,converter,etc.. and they could recomend a good cam. Or someone else on here will chime in with a idea for ya...

P.S. I still havent got that air foil back yet.

 

Very helpful

The air foil should be in the mail today.

 

This should be alot of good reading for ya

http://www.turbomustangs.com/smf/ind...?topic=61219.0

 

I say go for the 305 if that's what you want. But you can't really say "you just got spanked by a 305", when it's turbocharged BTW - "7.736 bore", OMG, that would be like a 680ci motor!

Get the book "Maximum Boost", you'll see why stainless is not the best material for turbo headers. You'll want to find some way to add support to the turbos way out there like that to keep the manifolds from cracking.

Honestly, a healthy stock motor could probably take the boost you speak of, assuming the tune is correct. (the 10lb thing might be tight) The Vortech kits claim 8lbs on a stock motor. The stock fuel pump probably will not be up to the task. How do you plan on controlling fuel delivery? Rise rate FPR? Stand alone PCM?

I have a single turbo 350 TPI powered by a 62-1 running 9lbs. I bought the BBS Designs manifold before they closed-up shop, and built the rest of the system myself. You'll love the sound and the feel when it's all done

 

haha, 3.736 bore

Ill have to look at that book, i thought it would be a neat project, but im a little new to turbo, and alot of things i have read just confuse me.

Ill change pistons forsure anyways, add ARP bolts in the rods and mains to add a bit of strenth down there.

TPI383 - I sent you an email about your airfoil. Definately would be interested in a set of these headers. Need to set some priorities for myself, but i have been curious on what kinda power this things can do if i were to just change pistons, bolts, bearings etc.

Thanks for the help!

Sheldon

 

Go for it, that engine will hold up just fine. And if you want to use hypereutectic pistons im sure those will hold up. my wrx has cast pistons stock and im running an sti turbo at 21psi with them, no problems for 60k and im sure it will go on longer. as long as you have a conservative tune it will run for a long time. oh and if you want to run those injectors at about 85% duty cycle you will have to raise the fuel pressure quite a bit, or just go with a set of 32lb/hr double check me here http://witchhunter.com/injectorcalc1.php4 and i put BSFC as .55 cause bob ida says so, and he tunes like a champ lol. as for the turbos you should look into dsm or wrx turbos, a pair of those will get you to 400hp easy, and you can pick them up for like $150 each. I think a set of grand national turbos would be a bit big for only 400hp, i mean my moms gn is making about 325hp with one of them. Though if you want to go bigger soon then they would do the trick... hope that helps you out a bit

 

The 305 rods are weak,get a set of pm rods instead of getting arp rod bolts and see if you can get a set of forged pistons the weight of your stock pistons,makes balancing easier. Remember,those heads have small cc chambers,keep the compression ratio to about 9:1. Do alot of research on turbos it can be very confusing. I have the Maxboost book and it's a big help. Would be gald to give you info I've gathered in the last couple of months.

 

i saw in another thread you were lookin for upgrades for a 305
have a look at this if you havent already
http://www.goingfaster.com/spo/carcraft325hp305.html

 

Yeah, ditch the 305 rods at least get 350 "X" rods with ARP bolts or the PM rods, and forged pistons. The crank would pretty much be last to upgrade on my agenda unless you've got a crank that's been welded or has spun bearings, heavily cut etc. etc. Then again if you're running a stock CR there's always the "bolt on a set of 64cc/72/76cc heads and see what happens" approach.

A matched pair of 2.5L dodge turbos, a set of 2.3L ford turbos or a pair of 300ZX turbos would be a pretty good place to go for your goals. Don't cheap on the fuel system, I'd rather be running a stock short block with bigger injectors, a good fuel pump and a decent management (aftermarket or $58/59 code on a stock box) then trying to do a hack job on a good long block.

Check my web site, my engine is being built with the intentions of doing a single H1E/H1C hybrid turbocharger. The rough specs are as follows and should be fairly easily capable of going to 400hp:

-30lb/hr injectors (woulda gotten 42s if I hadn't had em already)
-Walbro 307M fuel pump
-Megasquirt ECM
-LC-1 wide band

Engine consists of:
-stock 125K short block, hone visible in bores. What concerns me here is ring butting, I'd put in new bearings and and enlarge the ring gap if I wasn't on time constraints.
-production 416 heads, ported heavily. With the Felpro stock style head gaskets I'm probably at 9.2:1 static CR since they're thicker. A set of L98 heads would be a good choice or some Iron Eagles or S/Rs with 64 or 72cc chambers.
-ported intake, stock runners. This intake has been tens in a few cars, it's not as crippling to a boosted combo as it is to a N/A one.
-204/214@.05 .420/.442 valve lift cam. By far not the best out there, but still a huge step up from the stuff that came stock in the 86 TPIs. If you've got the L98 cam I'd be tempted to run it as is, but there's probably more then decent power to be had here.

 

Whats your combo...heads,cam,injectors,intake and the like

 

My complete stock 155,000 mile 305 tpi with a 61mm turbo ran a 13.6 @105mph 1/4 on a non intercooled 7psi.....it held together fine until it saw 20+ psi....I ran the car @15psi for quite a while, the rods and crank were fine...the #7 piston spit out a ringland tho. fuel mods were 24lb injectors @ 42psi base fuel pressure w/walbro 255lph in tank and walbro 255lph inline

 

+1 for the megasquirt

 

The heads are factory 76CC cast iron with 1.94/1.50 valves. The cam is a comp hydraulic flat tappet (262H - 218/224,462/468). Injectors are 50cc, with a 255 in tank fuel pump. Intake is a massaged factory TPI. All controlled by commander 950 software.

 

nice setup...Do you have any track times or dyno #s ? How much time did it take to tune your setup?

Thanks

 

I don't want to hyjack the thread. No dyno or track numbers yet, I just finished the install last month. I have only driven it once due to the weather. Hopefully by April it will be clear enough to really get some tuning time in.

 

thanks anywho

 

that bay looks good. You should start your own thread with info so you don't hijack this one... with more pic's.

 

Hey! I've got that book, and after reading it I still have every intention of using SS when I eventually do a TT setup. Care to rattle off a page #? I know their grow more, but splitting the head flange usually solves that, they also have a lower thermal conductivity, and won't rust - which is a good thing. If you can direct me to a page that I should re-read i'd appreciate it.

Why are you so set on using stock style rods like LT4 or X etc? There is an aftermarket for connecting rods eh? Rods and crank aren't the weak link in a forced induction motor, they're the weak link when you hit high RPM's. In high cylinder pressure you want a good head gasket and head studs (sounds like you've got that covered). If you want to cut o-rings into the heads, give'r - but Vizard says it's not really that necessary until ~1000HP anyway. Take that with a grain of salt.

I'd do the forged pistons now. The price difference is pretty small, and that way WHEN you crank up the boost, you've got a larger safety margin. Set your top ring gap STUPIDLY LARGE. Like .040" big. Trust me, you won't have to be buying stock in Quaker State, or using a gas mask to avoid blowby fumes.

I think crossfire_83 said some good things about forced induction 305s, due to the long stroke smaller bore - they're better at avoiding detonation - less flame front travel sorta thing. I'm not going to flame you for using a 305, but never say you're doing it to be different or to prove the engines are worthwhile. That arguement has been beated to death long ago - just say you're doing it - and leave it at that.

 

sorry to hyjack but CorViparo where did you get that coupler for your throttle body to ic piping? i have been looking for one for my turbo build and i can't seem to find one...

 

Wow!

Thanks for the info everyone. Im going to order that book and start doing some re-search.

Im concidering making a set of turbo headers in my Machine shop seeing we have a CNC machine that i can use to make the flanges.

Sheldon

 

Oh, and im certainly no set on stock rods.

Ill probably end up with Eagle I-beams. And im second guessing useing the 350 i have rather then the 305. Ive gotta get that book and research

 

I got it from a place nearby me that distributes all kinds of couplers and fittings for industrial and commercial applications. Their website is hosenow.com , but I don't think they have a web store. It's pretty pricey though, I think it was around $45. I think I am going to redesign the intake a little and make the piping flare out to match the TB, then just joint it with a straight coupler.

 

Check with your local mercruiser dealer, i am using a smallblock mercruiser exhaust coupler on my build, 4" to 3"!
Good luck!

 

For the 3" to oval 4", I took a piece of 4" pipe and cut off 2" and then ovaled it. Cut the 3" down the center and flair it to meet the 4" oval. Then add two pieces of sheetmetal / sheetaluminun to fill the pie shaped gaps.

Iroc-hx55power,
What turbine A/R are you using on the HX55?

 

Sup everyone, new member here and was browsing around and saw this thread. I also have a 305 but its the L69 which is carbed. I would like to do a twin turbo set up. I've done some research and the only thing that concerns me is what carb to use because of fuel problems. Of course with EFI engines can be tuned in reference to the boost, but not with a carb set up, so overall, i don't want to be dumping fuel into the engine at idle. Any Suggesstions?

 

almost any carb can be boost referenced read this
http://www.hangar18fabrication.com/blowthru.html
----
for a 3- 4inch oval mercruiser has a shaft boot for their i/o stern drives 3in. round to 4 inch but it has some ribs like any good rubber dont know if that would screw with flow

 

Do they come in different colors?

 

http://www.turbomustangs.com/smf/index.php?board=13.0

Start here, and go from there. They perdominantly use Holleys and Edelbrocks not the Q-jets, but there are some blow through Q-jets out there. As long as you boost ref the mechanical fuel pump or regulator if you're running an electric, you should be fine.

 

nope no colors but they might taste like something...

 

I think a turbo 305 is an awesome idea. So many people knock this engine, but I think that there's lots of room to explore. The smaller camshaft and lower compression ratios seem like they would be ideal for forced induction, and I'm personally a huge fan of smaller displacement engines with turbos making huge power that have the potential to put big blocks to shame. If and when you get this project on the road, i wish you luck. Again, sounds awesome. Also, I wouldn't listen to anyone telling you that you are wasting your time and you could get "so much more from a 350". I like that it's different and less charted territory than the rest.

 

Preach Brother Preach!

 

625 hp all stock internal 305....11.95 @ 117 mph 1/4mile. Nothing wrong with a 305, just needs a little attention.

http://www.cardomain.com/ride/2496232

PS- Motors back out getting 4-bolt splay conversion, 350 Eagle 4310 crank, 350 H-beam rods, and over .060 JE forged piston with worked Edlebrock Preformer heads, Crane 6.1:1 roller rockers and a mild Crane cam. Motor works out to a 339.9 or 440 cid or 5.5 if you will. Intend to push the boost from 12 to 22 will have dyno number within the month. Expecting 800-900hp.

Stay with your 305 mission and it WILL work out....

 

Zdaddy,

Love your car.

Any info on your extra 2 fuel injectors. what controller do they use etc..

 

Thanks!

The FIC is by Aquamist out of the UK. Good controller! The injectors are 2 160lbs Eccel box injectors.