rear mount turbo project
02-26-2012, 08:05 AM
#255
Like any turbo setup, the overall design matters greatly. As far as lag/response goes, that position is not much different than most top mounts with respect to distance from the engine. The manifold design, the turbo selection specifics, etc. There are other issues though like piping the cold side, oil, and water lines.
02-26-2012, 12:52 PM
#256
Like any turbo setup, the overall design matters greatly. As far as lag/response goes, that position is not much different than most top mounts with respect to distance from the engine. The manifold design, the turbo selection specifics, etc. There are other issues though like piping the cold side, oil, and water lines.
Running similar boost and starting from 2-3 car lengths behind him in 3rd gear from a roll at 3500rpm I would pull to about 3 car lengths in front of him by 8300rpm .
His turbo spoolup time was very poor yet as the rpms got higher I was hardly pulling away at all.
Last edited by Brettus; 02-26-2012 at 01:02 PM.
02-26-2012, 01:05 PM
#257
what is the basis for believing you are comparing what are two exact apples otherwise? What is his engine condition, what is his tune, what manifold design did he use to place it that far back, etc. etc. etc.
there could be any other number of things in his setup that are screwed up, everything in life is not as simple as a+b=c
there could be any other number of things in his setup that are screwed up, everything in life is not as simple as a+b=c
02-26-2012, 01:15 PM
#258
what is the basis for believing you are comparing what are two exact apples otherwise? What is his engine condition, what is his tune, what manifold design did he use to place it that far back, etc. etc. etc.
there could be any other number of things in his setup that are screwed up, everything in life is not as simple as a+b=c
there could be any other number of things in his setup that are screwed up, everything in life is not as simple as a+b=c
Personally , I saw enough to form the view that it is just a bad idea (if you want good response) to mount the turbo any distance away from the ports.
02-26-2012, 09:09 PM
#266
the problem is your trying to compare 2 different cars and setups with SIMILAR turbos. The problem is there are a lot of variables that are being left out. It may not seem like a big difference but it is. The differences has been shown on a trial and error basis. I have been talking with quite a few people to see if the issues i am experiencing and a way to tackle it.
The problem with mounting a turbo i a different location is things have to be tackled in different ways and it is not as easy because the information is not out there and straight foward.
I have compared logs with other people and the match up very close but the power delivery seem to be smoother on my set up, but this is just a BUTT DYNO. Even you said it your self it looks good on paper.
Im not here to get into a big debate. It is well apperant that everyone one here has their own opnion on what is BEST and i do not see this changing. I have chose not to continue this thread because of where i have seen others lead. It always seem to get away from the topic and a debate between egos. Ive had half a mind to just delete the thread itself.
I do thank the people that have taken the time to help awnser questions as they come along to help improve what i started with and hope it continues. I will say I have no regets on choosing to go this route and its been a learning experience i have hated and enjoyed at the same time.
The problem with mounting a turbo i a different location is things have to be tackled in different ways and it is not as easy because the information is not out there and straight foward.
I have compared logs with other people and the match up very close but the power delivery seem to be smoother on my set up, but this is just a BUTT DYNO. Even you said it your self it looks good on paper.
Im not here to get into a big debate. It is well apperant that everyone one here has their own opnion on what is BEST and i do not see this changing. I have chose not to continue this thread because of where i have seen others lead. It always seem to get away from the topic and a debate between egos. Ive had half a mind to just delete the thread itself.
I do thank the people that have taken the time to help awnser questions as they come along to help improve what i started with and hope it continues. I will say I have no regets on choosing to go this route and its been a learning experience i have hated and enjoyed at the same time.
02-26-2012, 09:15 PM
#267
02-26-2012, 10:44 PM
#268
the problem is your trying to compare 2 different cars and setups with SIMILAR turbos. The problem is there are a lot of variables that are being left out. It may not seem like a big difference but it is. The differences has been shown on a trial and error basis. I have been talking with quite a few people to see if the issues i am experiencing and a way to tackle it.
The problem with mounting a turbo i a different location is things have to be tackled in different ways and it is not as easy because the information is not out there and straight foward.
I have compared logs with other people and the match up very close but the power delivery seem to be smoother on my set up, but this is just a BUTT DYNO. Even you said it your self it looks good on paper.
Im not here to get into a big debate. It is well apperant that everyone one here has their own opnion on what is BEST and i do not see this changing. I have chose not to continue this thread because of where i have seen others lead. It always seem to get away from the topic and a debate between egos. Ive had half a mind to just delete the thread itself.
I do thank the people that have taken the time to help awnser questions as they come along to help improve what i started with and hope it continues. I will say I have no regets on choosing to go this route and its been a learning experience i have hated and enjoyed at the same time.
The problem with mounting a turbo i a different location is things have to be tackled in different ways and it is not as easy because the information is not out there and straight foward.
I have compared logs with other people and the match up very close but the power delivery seem to be smoother on my set up, but this is just a BUTT DYNO. Even you said it your self it looks good on paper.
Im not here to get into a big debate. It is well apperant that everyone one here has their own opnion on what is BEST and i do not see this changing. I have chose not to continue this thread because of where i have seen others lead. It always seem to get away from the topic and a debate between egos. Ive had half a mind to just delete the thread itself.
I do thank the people that have taken the time to help awnser questions as they come along to help improve what i started with and hope it continues. I will say I have no regets on choosing to go this route and its been a learning experience i have hated and enjoyed at the same time.
The guy who bumped the thread asked a good question . I felt I had something to say about it because not many people have had a chance to compare two different setups like this side by side in a real world situation. IE a drag race .
I had a good knowledge of both setups .
Based on that , I felt that any differences between the two setups were going to be attributed more to the turbo placement position than any other one factor.
Sure there are things that could have been done to improve response but the simple fact is that the physics favour a manifold mounting position.
It is only through threads like this that we all can gain knowledge from the different things that people try so please keep it open .
Sorry for the thread crap .
BTW - the main issues that this guy faced were :
oil drain - he went through 3 turbos trying to sort this - never did completely.
air filter - placed under the car it was an issue with water and hot air. Piped to the front and the pipework became a huge restriction to flow .
Other than this (and the lag mentioned earlier) the car went really well ,was very smooth to drive and would blow the doors off most greddy setups as far as outright acceleration went.
What are your issues ?
Last edited by Brettus; 02-26-2012 at 11:01 PM.
02-27-2012, 09:10 AM
#269
It's amusing that you believe owning a Greddy turbo kit somehow makes you a turbo expert along with one of your other half cocked ideas that somebody you think doesn't have a turbo can't possibly have any knowledge about or experience with turbo systems. I had a Greddy kit in my hands for several minutes before deciding the design is unacceptable and putting it up for sale.
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