968 turbo-ing methods
11-07-2003, 02:30 PM
#17
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Dfast, not everone has the budget to go PH route. Some of us also like to do things ourselves even when we could afford PH. I am in the 2nd category. They make great turbo's but there is more than one way to get things done.
My current motor is running some of their internals so I know 1st hand that what they build works.
My current motor is running some of their internals so I know 1st hand that what they build works.
11-10-2003, 05:31 PM
#18
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just throw a 968 eng. into your 951.
no wait. do you want to get rid of your 951???
tim is probably going to make the exhaust and intake piping. using his intercooler. (after i mount the seats. and do some chassis work.
no wait. do you want to get rid of your 951???
tim is probably going to make the exhaust and intake piping. using his intercooler. (after i mount the seats. and do some chassis work.
11-10-2003, 08:29 PM
#19
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I have just the turbo for you, garrett GT30 dual ball bearing, its water cooled as well as oil cooled and is rated for 550hp. Its brand new as well and comes with all the adapters and brackets to make it work on our cars. Its a complete package which includes custom crossover, custom dumptube and adapters and everything is HPC coated to lower temps. Let me know if you are interested. These turbo's love to run high boosts as well and don't have any KKK hotside related backpressure issues.
11-11-2003, 01:49 PM
#21
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Dfast, if I would start taking my car to the shops for everything, I would end up selling it as I would not have been able to afford it. The only reason I have been able to keep them is cause I do most of the work myself. To me, that is what adds into owning these cars. That is not to say that if you go to a shop, you don't enjoy your car as much.
There are things I prefer to take to the shops as well, my Porsche is just not one of them. Thanks for your kind words and good luck on the 22nd.
There are things I prefer to take to the shops as well, my Porsche is just not one of them. Thanks for your kind words and good luck on the 22nd.
.
11-17-2003, 04:35 PM
#26
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Brought over from the 968 tranny post i just made, Raj you told me a while back that 2mm shorter rods along with machined pistons would raduce the compression enough to turbo. Why not spare the machinests guesswork and possible screwing up of your pistons by doing something like installing the same rods that are commonly availible for the 2.8 stroked 951 engines. They are about 4.5mm shorter. If that is not short enough to ignore any work done to the piston tops, then why not have custom rods in whatever the right length is?
11-17-2003, 05:11 PM
#28
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I have just the turbo for you, garrett GT30 dual ball bearing, its water cooled as well as oil cooled and is rated for 550hp. Its brand new as well and comes with all the adapters and brackets to make it work on our cars. Its a complete package which includes custom crossover, custom dumptube and adapters and everything is HPC coated to lower temps. Let me know if you are interested. These turbo's love to run high boosts as well and don't have any KKK hotside related backpressure issues.
could you please pm or email me with the price for the GT30 set up.
11-18-2003, 10:45 AM
#29
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Dyna, i am not sure anymore if I want to sell it. If I change my mind, I will let you know. I want to try the GT25 and the GT30 and see for myself which one I prefer on my car and then sell the other one. Both kits are complete so whoever buys the one I don't need will get a direct bolt-on package.
11-21-2003, 12:02 AM
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Originally posted by silicondigital
Brought over from the 968 tranny post i just made, Raj you told me a while back that 2mm shorter rods along with machined pistons would raduce the compression enough to turbo. Why not spare the machinests guesswork and possible screwing up of your pistons by doing something like installing the same rods that are commonly availible for the 2.8 stroked 951 engines. They are about 4.5mm shorter. If that is not short enough to ignore any work done to the piston tops, then why not have custom rods in whatever the right length is?
Brought over from the 968 tranny post i just made, Raj you told me a while back that 2mm shorter rods along with machined pistons would raduce the compression enough to turbo. Why not spare the machinests guesswork and possible screwing up of your pistons by doing something like installing the same rods that are commonly availible for the 2.8 stroked 951 engines. They are about 4.5mm shorter. If that is not short enough to ignore any work done to the piston tops, then why not have custom rods in whatever the right length is?
ok lets see here.
to put it in laymens terms.
the 2.8L stroker is based off of a smaller bore then the 3.0L engines. the pistons are different in mass and shape. so using 4.5MM shorter rods on a 100mm ish bore ( as on the 2.5 l blocks ) compared to the 103mm ish bore of the 3.0l block. the volume of air is different in relation to the position of the piston. so you really cannot take a 4.5mm rod and place it in an environemt of different bore sizes and more air volume, and expect the compresson to be around 8.5:1. Im guessing here but if 2 MM will drop the compresson from 9.0:1 to 8.5:1ish an additional 2.5 mm will drop it to about 7.8:1 ish compression.
also the pistons are traveling 4.5MM lower on the clyinder walls and adding more undue stress lower on the cly walls. not to mention that the piston is dipping lower then it was originally intended.
In any novel that was published about turboing a notn turbo engine.. they always stress that just shortening the rods is the worst way to reduce compression. im not saying that it is bad. espically when you have enough room and structural supprot to play with.. but in high tollerance engines where in the stock trim everything is planned to a T, of what each part cah take in relation to abuse. then amking the piston more farther then it was origionally intended will most likly shorten the life of the cly walls or make a contact between the piston and crank. or piston and block.
mike