hello I just recently found this forum on the internet. I'm glad to be in here and looking forward to share my little bit of knowledge with a lot of knowledge I'm sure this forum posesses.
I'm fairly new at chevy engines. I bought a 305 + T5 tranny for $300. And I found a little mazda to put it on. Now I know these engines don't make a lot of horsepower but what can u expect from them. How do they perform. The engine I believe it runs good but my real question is - I have this T3 turbocharger i really wanted to put on this engine. How much boost would be safe for this engine? My setup will consist of a:

T3 turbo w/ separate waste gate.
holley 750 cfm double pumper 4779 which I have to send to some shop to get it boost ready.

Don't know if I wanna intercool it or not. Tel me what ya think. here is th link to my webpage Chevy eXperimantal RS

thanks for having me

 

you'll probably want two of those turbos. most people run 10psi or less with stock pistons, replace them and you can run a bit more. a 350 would be better, but you can set it up on the 305 and transfer it all over to a 350 later. i also predict a short life for that t-5.

 

If the engine and trans are good then you can't go wrong for $300. It would be a lot of fun in a light car like that. Since it won't have much traction I bet the T5 will last quite a while.

You will need two T3s minimum on the 305ci. There are a few people in this forum with boosted 305ci. Do a quick search. I think there a few threads dedicated to 305ci turbo setups.

 

ahh, into an Rx7, cool... I always liked the rotary motor style, but it's way too small to be useful. Excellent choice. Looks like it fits the engine bay ok too, I woulda thought it'd be super tight... huh...


what year vehicle did that 305 come from? we can give more tips based on that. also what casting # is on the heads?
main thing with the 305 is that it's bore/stroke ratio isn't as favorable as other motors in it's size range, ie, for 302, chev 350.... So the valves are a bit shrouded by the smallish bore.


should be a fun car!

 

Light RWD 5-speed + stock sbc + 6-8psi from 2 T3's = Reliable Fun!

A 750 carb is way too big for any stock 305, if that one is stock (under the aftermarket mani and headers). Something like a 600 or 650 would suit it better.
It depends on the specs of that particular 305 as to how much power it should make now and how much it should make with boost. Which T3's also make a difference, as well as plenty of other little stuff. To throw out an overall blanket figure, 300-350hp shouldn't be hard at all. It could have anywhere from 145hp on up right now, we don't know without specs, so let us know and we may be able to help out.

Good luck!

 

For what i know this engine has been rebuilt once by somebody else. I don't think he put anything forged or anything. So I'd say is pretty much stock. Don't know what the compression is on stock engines. here is the turbo I'm putting on. I had this on my eclipse and I thought it was way too big for that engine. So.... I'm gonna try to put it on the 305 and I know very well that Twin turbo would be so much better, I don't wanna spend that money right now. The choice of the 750 wasn't really my choice. I been talking to some carb shops in california that modify the carb for boost ( solid floaters stuff like that) and they specifically asked for the 750. Planning of pushing 5-7 psi. I really want to put the turbo somewhere underneath the car if I find any room on that small a$$ car I have. here is the pic of the turbo still mounted on the eclipse .

check out the link for a few updates on the car Chevy eXperimantal RS

Ps; I know its a T3/T4 Hybrid but thats about it

 

In comparison on that pic.....I see a turbonetics deltagate and it looks huge close to that turbo....I have a T61 which is "ok" for a 305 and it dwarfs a deltagate....like the thing would almost fit in the suction of my turbo lol

 

There were many variations of 305's. It may be stock (except for the intake and headers), but being stock doesn't say anything about which 305 it is. You need to get some casting numbers to look up, which will tell you more, but still not everything. However, more info is better than no info.

Even though that's a T3/T4 hybrid and not just a T3, it's still too small. There could be variations of a T3/T4 that would work on a very low-boost, low RPM 305, but that doesn't appear to be one of them (PS, that IC location is extremely unideal, bordering pointless. ).
For reference, I have a T3/T4 (T04E/50 trim, .63ar/stg III) on my Talon (which has the stock 4G63 2.0 and not the stock non-turbo 420A 2.0 that yours had), and it's not even close to being too big for it. It'll hit full boost (24psi on good gas) by 3500rpm and pulls very nicely to 7500. That turbo on a 305 would suffocate rather quickly. While it makes somewhere around 425hp on race gas, the exhaust side is way too small to support 5 liters of exhaust flow to any appreciable RPM.

For all practical purposes, you need two of what you have, or a single bigger one.

5-7psi shouldn't be a problem on any stock 305, with any stock compression ratio.

I'm not a carb-boost expert, but I've read from those types that it isn't neccesary to go with a huge carb in a blow-through application, and a 750 on an otherwise almost-stock 305 is huge.

The best piece of advice anyone could give you right now is to use the search feature religiously.

 

Since it will be a custom setup I would consider even cutting the floor and making a sheetmetal hump/box to fit the turbo under the car. It has been a long time since I have looked at an RX7 though.

 

So you think is too small - I can always upgrade later. I don't know I jsut don't want to throw it away. are u 100% sure that thing would not work. I mean the turbo is good for 30psi...

 

After this pic I hope u change your mind about my intercooler coz it worked great with that huge scoop I had. Serioulsy except warm days my engine would even reach running temp.

 

Well as I said, my Talon's turbo often sees 24psi (could see 30 if my engine could handle it), and it's way too small for a 305. Boost pressure only comes from the restriction of the engine not ingesting all that air, so it has little bearing on what's sized properly or not for purposes of this discussion. The exhaust side has much more to do with that aspect.

Don't throw it away, just get another exactly the same, and you'll be set. Otherwise, sell it to me for $50

Edit: HOLY COW THAT'S A HUGE SCOOP. Asthetics aside, I retract a part of my previous statement. It is still an unideal location, though.

 

I've looked for another one exactly the same on ebay but I never found one. They are different. Would it matter if the turbos werent exactly the same?

 

Yes, it would matter.

You really need to do a lot of searching.

 

U know I did some research tonigh but I couldn't find anything about the turbo I have so i can find a twin for it. All I remember now that the only thing written on it was "Airesearch" and the weird part is that the turbo has bolt on flanges on the intake - exhaust and the output. looks kinda like this If anybody has any ideyer wherI can find another one of these I would very very very very much appreciate it.

 

AirResearch = Garrett, which is the company that makes said T3's and T4's. I haven't actually seen a T4 compressor housing with those flanges, only various stock T3's.

Somewhere on the compressor housing there should be a .XX number, like .42 or .60 or something. Same thing on the turbine housing, like .48 or .63. What are those numbers?

The only real way to find out which wheels they are is to take off the housings and measure the large diameter (closest to the center section) and the smaller diameter (furthest from the center section). Do one side at a time. If you don't have calipers, you could do what I did. I went a "precisely ghetto" route and figured out which sizes my wheels looked very close to with known wheels (comparing from this page for the compressor... Tuff-Turbo ), then used my trusty tape measure and a very careful eye to mark exact parallel lines on a piece of paper spaced in that exact length, then cut out those lines so I could fit the paper snugly around the whole wheel (big diameter and small, separately). This worked out well.

One way or another, those are the 4 overall numbers (compressor a/r, turbine a/r, compressor wheel diameters, and turbine wheel diameters) that will tell you what the specs of the turbo are.

PS: Please edit your post so that picture isn't gigantically huge so everyone doesn't have to scroll back and forth to read the posts. Thanks.

 

Ok I'm gonna get a hold of my brother and see if I can get those numbers. I'll post em in here tomorrow. thanks for the great info tho everybody. from this discussion here today i'm convinced that i do need another turbo for a twin setup so hopefully I find out what i have so i knwo what to get. I'll post updates. thanks

 

those flanges look like ford t3 60 trim compressor flanges.

 

Thats because they are lol

 

go to the NATO Home Page site or www.turboford.com to find a mate for twins....usually have some on there but you need to find if you have the .63/.60 or the .48/.60...those are the 2.3t turbo's from some of the turbo coupes and SVO's you dont want the warner ishi tho

 

Okay, both of you please edit your posts to get rid of all that pointless white space so everyone doesn't have to scroll back and forth to read messages. Thanks

 

I know it is very extensive and painstakingly hard to use the scroll wheel on the mouse.....so I edited out the picture for you so you won't have to worry about over excerting yourself.

 

That was very considerate of you.
It's actually my eyes that hate it, not my hands.

 

Where can I can a dual wheeled mouse? Mine only scrolls vertically. Who makes a mouse with a horizontal wheel?

 

 

Laziness at its best lol. At least when I'm lazy it involves actual work tho lol

 

Laziness is refraining from editing out a useless waste of somebody's bandwidth, and then quoting said waste of bandwidth without editing it out just the same.

Annoying is when you have to move the super-size 20 screen back and forth 72 times to fit in your average-size 10 monitor, just to read one sentence.

 

Or it could be summed up into the "whining" category.....

just jokes people I'm not serious if you thought I have been.

 

Ha ha, and I thought going to a 22" monitor would eliminate problems like this.

Yeah, he's lazy so I guess I will be lazy too and just ignore posting to any threads started by them.
Then again, I might miss out on funny stuff like that hood scoop. Love the creativity.

I guess this means that a dual wheeled mouse isn't available.

That so called T3/T4 hybrid looks like a stock T3 60 trim Ford to me. Although, everything is a "hybrid" on Ebay lately.
Two of those Ford T3 60 trims would work nice on the 305.

 

now now, I still love you guys! I was just playin around. ya lazy bastages lol

But back on topic! two of the .48/.60 or .63/.60 ford T3's would actually have a lot of potential on a 305....I had a 2.3t swapped 87 notch mildly built with a single .63/.60 that proved they were a descent T3!

 

I went thru some of those websites and I found out that this is a T3/T4 hybrid used mostly by SVO as an upgrade for they T3. I saw the similar T3 they had an internal wastegate and mine doesn't - not just based on that but I saw a lot of pics. I'm convinced that it is a T3/T4 hybrid. Now I have to find another one. Sorry for the late reply but I was on duty. I'm in the army

 

Ok I got the numbers from the turbo this is what it says on it
A/R .63 on the other side it says M11 and onthe output flange is 792. can anybody translate these numbers ????