can u turbocharge a 305 TPI???
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Registered User
Joined: Jan 2003
Posts: 8
From: Tampa FL
can u turbocharge a 305 TPI???
im sure u can turbocharge a 305 TPI im just not surew where or how much it would cost... i need a reasonable set up just to get a good time i was think a TA-60 i think it is would be a great size for this engine... i dont know i need some tips. if u guyz know any1 around tampa,FL plza let me know.. thnx i hope some1 knows..
Mike
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Joined: Mar 2003
Posts: 1,240
From: Markham, ON
theres no point in a turbo if your engine is pretty much stock...with a stock 305 (im about to put out a random number that could be way off) you could run a turbo with a max of like 6-8 pounds of boost? and for the money you could beat the amount of hp you would get from the turbo with other mods. The idea is usually to build up the entire engine with good parts and then get a turbo because you can run an insane like 25 pound boost through your turbo and get a 250-300 hp increase
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Joined: Dec 1998
Posts: 26
From: Glendale,AZ USA
Originally posted by doug791
The idea is usually to build up the entire engine with good parts and then get a turbo because you can run an insane like 25 pound boost through your turbo and get a 250-300 hp increase
The idea is usually to build up the entire engine with good parts and then get a turbo because you can run an insane like 25 pound boost through your turbo and get a 250-300 hp increase
SB
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Joined: Dec 2001
Posts: 119
From: Falls Church, VA
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Joined: Aug 2002
Posts: 1,291
From: Teeter-tottering between Brilliance and Insanity
A crapload of $. IMO opinion with your engine if you want forced induction go with a supercharger. You will acheive pretty much the same result. With much less headaches and $ spent.
And as a side not esince you asked, I know Im not the Forced Induction expert you were lookig for but I do live in Tampa.
And as a side not esince you asked, I know Im not the Forced Induction expert you were lookig for but I do live in Tampa.
Last edited by DarthIROC; May 3, 2003 at 12:27 PM.
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Joined: Sep 1999
Posts: 2,342
From: MI
dyjdgyf
Information and research.
If you aren't sure if an engine "can" be turbocharged, then you honestly shouldn't pursue the challenge. Read some books, surf the web for personal experiences, and do some calculating.
Andris Skulte's website is a great way to learn about how this can be done. The man is a great engineering mind. Goodluck!
If you aren't sure if an engine "can" be turbocharged, then you honestly shouldn't pursue the challenge. Read some books, surf the web for personal experiences, and do some calculating.
Andris Skulte's website is a great way to learn about how this can be done. The man is a great engineering mind. Goodluck!
Registered User
Joined: Feb 2001
Posts: 279
From: Feasterville, PA
Originally posted by doug791
really? i had been told by a buddy of mine that he gets about 300 horses out of that much boost on his grand national engine but i know he doesnt know that for a fact theyre just vague numbers
really? i had been told by a buddy of mine that he gets about 300 horses out of that much boost on his grand national engine but i know he doesnt know that for a fact theyre just vague numbers
Registered User
Joined: Dec 1998
Posts: 2,161
From: Haslett, Michigan
Hi there!
There's no reason why you cannot turbocharge a 305, any more than turbocharging a 350. Both engines use a 3.48 inch stroke crankshaft with the same size main bearing journals. Both use 5.7 inch rods with the same composition. Both use pistons of similar construction and quality. Reliability of a 305 is on par with a stock 350 in most every way.
The 305, by virtue of its smaller bore, has a harder time filling the cylinder with air/fuel during the intake phase. A turbo can help overcome this issue by increasing the density. So can supercharging and nitrous. This may be why some of out 305 owners are getting some unexpected increased efficiency out of their nitrous kits when at the track... (hint..hint..DennyV ! )
If you have an LG4 version of the 305, you already have an engine with 8.5:1 compression ratio which is also a decent starting place for turbocharging. The places you need to first look for efficiency and changes are not at the intake side, but at the exhaust side, and at the camshaft. Your turbo application will necessitate a custom exhaust, but while you are working it over, be sure to get in and port out the exhaust in the cylinder head. You will need to clear out the restrictive port so that you can more efficiently apply power to the vanes of that turbo. The boost on the intake side will go a long way towards getting the air through the restrictive intake tract.
On cams, the trick seems to be a profile with a wide lobe separation angle, and a big exhaust duration. Of course, again I defer to our turbo expert Andris Skulte. http://www.skulte.com
You will need to also increase fuel delivery via bigger injectors ( 30 lb. / hr), ECM tuning, and will also need to fix your cooling system with an aftermarket radiator by Griffen or Be-Cool.
That's my two cents on the matter. If you want to turbocharge, definitey start with your current engine. You can afford to make mistakes on it. It sure would be a shame to spend $3800 or more on a killer new longblock, just to have your newly designed fuel delivery system go lean and burn holes in your new pistons on the maiden voyage.
--drb
There's no reason why you cannot turbocharge a 305, any more than turbocharging a 350. Both engines use a 3.48 inch stroke crankshaft with the same size main bearing journals. Both use 5.7 inch rods with the same composition. Both use pistons of similar construction and quality. Reliability of a 305 is on par with a stock 350 in most every way.
The 305, by virtue of its smaller bore, has a harder time filling the cylinder with air/fuel during the intake phase. A turbo can help overcome this issue by increasing the density. So can supercharging and nitrous. This may be why some of out 305 owners are getting some unexpected increased efficiency out of their nitrous kits when at the track... (hint..hint..DennyV ! )
If you have an LG4 version of the 305, you already have an engine with 8.5:1 compression ratio which is also a decent starting place for turbocharging. The places you need to first look for efficiency and changes are not at the intake side, but at the exhaust side, and at the camshaft. Your turbo application will necessitate a custom exhaust, but while you are working it over, be sure to get in and port out the exhaust in the cylinder head. You will need to clear out the restrictive port so that you can more efficiently apply power to the vanes of that turbo. The boost on the intake side will go a long way towards getting the air through the restrictive intake tract.
On cams, the trick seems to be a profile with a wide lobe separation angle, and a big exhaust duration. Of course, again I defer to our turbo expert Andris Skulte. http://www.skulte.com
You will need to also increase fuel delivery via bigger injectors ( 30 lb. / hr), ECM tuning, and will also need to fix your cooling system with an aftermarket radiator by Griffen or Be-Cool.
That's my two cents on the matter. If you want to turbocharge, definitey start with your current engine. You can afford to make mistakes on it. It sure would be a shame to spend $3800 or more on a killer new longblock, just to have your newly designed fuel delivery system go lean and burn holes in your new pistons on the maiden voyage.
--drb
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