968 turbo-ing methods
10-31-2003, 08:37 PM
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968 turbo-ing methods
I recently threw a rod in my 951, and bought a 94 968. I love the 968's looks and new-ness, but loved my 951's power curve. Im in the process of either just rebuilding my 951 engine and dropping it into my 968, and selling the nice 968 engine to cover the cost of that. Or if it is going to be comprable in price given i have the 951 parts to work with, maybe turbocharging the 3.0l 968 engine.
As i currently believe, the only thigs keeping you from slapping 951 parts on a 968 to make it a turbo are the head and manifold that goes with it, and the compression ratio. (not dealing with engine management)
What ways are their around the turbo-useless manifold and/or head?
Also whats with the 10 thousand dollars people want to reduce the compression in a 968? Why can you not just machine some dishes into the tops of the pistons or someting and call it done? Is their not enough metal to remove to lessen compression enough?
Are their any diffacultys dropping a 951 engine and Compter right in?
Where can the intercooler and its airways be mounted? Oil cooler, and does the turbo piping clear everything on a 68?
As i currently believe, the only thigs keeping you from slapping 951 parts on a 968 to make it a turbo are the head and manifold that goes with it, and the compression ratio. (not dealing with engine management)
What ways are their around the turbo-useless manifold and/or head?
Also whats with the 10 thousand dollars people want to reduce the compression in a 968? Why can you not just machine some dishes into the tops of the pistons or someting and call it done? Is their not enough metal to remove to lessen compression enough?
Are their any diffacultys dropping a 951 engine and Compter right in?
Where can the intercooler and its airways be mounted? Oil cooler, and does the turbo piping clear everything on a 68?
10-31-2003, 09:23 PM
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Sili, good questions. First off, most parts will fit except for intercooler as the body was not designed to run an intercooler. That said, you can still modify the body to make it fit and this is how the factory did it as well with the 968 turbo S.
In order to run a turbo setup in a 968, your best bet is to just drop your entire drivetrain from your turbo upto your trans in your 968 and you are good to go. Your cost will not be much besides modding the body to fit the intercooler. This way you have an engine that is built for turbocharging and if you ever want more power, you can just swap turbo, maf and injectors to make additional power.
Sell the 968 motor and save your cash or use it towards the body mod. You will need to run 944 turbo electronics and they will fit in the same way 968 electronics do.
Dishing pistons, shaving them and then 2mm shorter rods yield a 8.5:1 compression with a turbo head and there just ins't enough material to just shave the pistons. If you want your 968 engine to last, this is a must unless you run really low boost but that would defeat the purpose of going the turbo route. You will definitely pick more pwr up but not substantial. Also, you will need to either modify a 944 turbo head or find a 2.7 head to make it happen with a 968 shortblock.
Let me know if you have any further questions.
In order to run a turbo setup in a 968, your best bet is to just drop your entire drivetrain from your turbo upto your trans in your 968 and you are good to go. Your cost will not be much besides modding the body to fit the intercooler. This way you have an engine that is built for turbocharging and if you ever want more power, you can just swap turbo, maf and injectors to make additional power.
Sell the 968 motor and save your cash or use it towards the body mod. You will need to run 944 turbo electronics and they will fit in the same way 968 electronics do.
Dishing pistons, shaving them and then 2mm shorter rods yield a 8.5:1 compression with a turbo head and there just ins't enough material to just shave the pistons. If you want your 968 engine to last, this is a must unless you run really low boost but that would defeat the purpose of going the turbo route. You will definitely pick more pwr up but not substantial. Also, you will need to either modify a 944 turbo head or find a 2.7 head to make it happen with a 968 shortblock.
Let me know if you have any further questions.
10-31-2003, 09:59 PM
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Just what is involved in getting the intercooler in there? it looks like it will sit on top of the raiditor just fine, but you would just need to cut out the air dam for the old 968 airbox lead-in right? or does the intercooler not fit at all (too wide)?
10-31-2003, 10:40 PM
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Sili, the intercooler will need to sit a little lower than what the factory setup will let you. Also, you need to figure how you will make your hatch mechanism work as the mechanism sits right in the middle. One way is to move it to the side and add a 2nd one to teh other side like teh factory dit. also need to create mouting brackets for the intercooler
11-03-2003, 01:58 PM
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Ok, so now that i pretty much have an idea of everything, Just how much trouble is that hood latch/intercooler problem? i mean what am i looking at spending and who will have to do the welding and cutting of that area without screwing up the front end of my car? Thats the main thing im still worried about. What methods are used for the dual latches and cables to them ect..?
Throwing in the 951 engine seems like the best way to get a "968 turbo" while keeping the costs way WAY down. Why dont other people do this all the time rather then screwing with turbocharging a 968? You can get a used 951 motor for about 2000$, a much nicer garett turbo for about 7-800, and some 72 lb/hr injectors and have a 968 in the 400rwhp area or higher for less then 4k all said and done. The only thing im missing from this is a 951 shortblock and a bigger turbo to have one badass 968 Turbo, after all the labor is done that is.
Plese let me know if what im saying is off-track anywhere.
Throwing in the 951 engine seems like the best way to get a "968 turbo" while keeping the costs way WAY down. Why dont other people do this all the time rather then screwing with turbocharging a 968? You can get a used 951 motor for about 2000$, a much nicer garett turbo for about 7-800, and some 72 lb/hr injectors and have a 968 in the 400rwhp area or higher for less then 4k all said and done. The only thing im missing from this is a 951 shortblock and a bigger turbo to have one badass 968 Turbo, after all the labor is done that is.
Plese let me know if what im saying is off-track anywhere.
11-03-2003, 02:07 PM
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Sili, you can never get rid of the lag on a 2.5 motor. 3.0 on the other hand has no such problem. It has a lot of torque and makes boost very quickly.
When you start going with bigger turbo's, most times your lag will increase, especially with the 2.5. Also, it might seem easy but its still pretty involved. The body mods scare a few people away. You also also get pins into your hood if you don't mind that hotrod look. In order to make the intercooler fit, you will have to cut a section behind the nose.
When you start going with bigger turbo's, most times your lag will increase, especially with the 2.5. Also, it might seem easy but its still pretty involved. The body mods scare a few people away. You also also get pins into your hood if you don't mind that hotrod look. In order to make the intercooler fit, you will have to cut a section behind the nose.
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11-05-2003, 02:59 PM
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Yeah, but the 22-25 thousand dollar figure they gave me is a little bit out of the question (more then twice what i payed for the damn 968 in the first place.)
11-05-2003, 11:40 PM
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Turbocharging can get expensive. Even when done by yourself, it will be atleast half of PH. You will spend atleast $10-12K and that is if you can get all the parts cheap and use as many 944 turbo parts as possible.
I can't wait to turbo charge a coupe someday.
I can't wait to turbo charge a coupe someday.
11-06-2003, 02:24 AM
#11
As opposed to what... the turbo coupe you already have???? lol
I'm already jealous and you're rubbing it in... :P
Regards,
I'm already jealous and you're rubbing it in... :P
Regards,
11-06-2003, 10:14 AM
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Jason, thanks for the compliment. Yes, it does move pretty well. I want to see if I get any improvements with the turbo RS engine.
Scott, I have a done tons of research in the last yr and would like to do it by myself this time and not inherit someone else's fruit of labor. I love my car and never plan to get rid of it (hopefully) but I want to see how close I can get to building a car similar to mine as far as driveability and reliability is concerned.
Hopefully in another yr, I can find a clean coupe with engine damage. It would make for a good start.
Scott, I have a done tons of research in the last yr and would like to do it by myself this time and not inherit someone else's fruit of labor. I love my car and never plan to get rid of it (hopefully) but I want to see how close I can get to building a car similar to mine as far as driveability and reliability is concerned.
Hopefully in another yr, I can find a clean coupe with engine damage. It would make for a good start.
11-07-2003, 09:40 AM
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Yeah Damian, bring it over. I thought you wanted to Chev it up if that ever happened, lol.
I am surprised you didn't come to that guys resque the one who wants to throw a Chevy in his 968. All these guys have been beating him over it. Funny how its okay for anyone to do any mods as long as they are happy with it, but swapping engines brings out a lot of emotions.
I am surprised you didn't come to that guys resque the one who wants to throw a Chevy in his 968. All these guys have been beating him over it. Funny how its okay for anyone to do any mods as long as they are happy with it, but swapping engines brings out a lot of emotions.