Turbo v. exhaust size Question
01-15-2008, 03:51 PM
#1
Drifting
Thread Starter
Turbo v. exhaust size Question
I have a C6 but this is more for my SRF which is a 2.0L fuel injected 4 cylinder.
I want to put a small turbo on it. I have a Garret T25 with a .63AR on the exhaust turbine. The size of the exhaust inlet from the engine head to the turbo is REALLY small! Is this normal or will it choke the engine off?
It just seams to me that if you are pumping more air and fuel in that y9ou will need to have a decent exhaust outlet. The people at Garret say this is the best turbo for the application.
Any turbo experts out there? I also have a T3/T4 unit but it is huge by comparison and I only want to run ~ 8 Psi and I also need it to spool quick ~2500 Rpm.
Thanks
I want to put a small turbo on it. I have a Garret T25 with a .63AR on the exhaust turbine. The size of the exhaust inlet from the engine head to the turbo is REALLY small! Is this normal or will it choke the engine off?
It just seams to me that if you are pumping more air and fuel in that y9ou will need to have a decent exhaust outlet. The people at Garret say this is the best turbo for the application.
Any turbo experts out there? I also have a T3/T4 unit but it is huge by comparison and I only want to run ~ 8 Psi and I also need it to spool quick ~2500 Rpm.
Thanks
01-15-2008, 04:22 PM
#2
Former Vendor
A spec racer ford with a GT25 would be a fun ride!!
The turbo inlets are small in comparison to what you would be used to Naturally aspirated. The GT25 is indeed a good turbo for what you want to do, and the inlet will be a little small. turbine discharge should be 2.25-2.5"
The turbo inlets are small in comparison to what you would be used to Naturally aspirated. The GT25 is indeed a good turbo for what you want to do, and the inlet will be a little small. turbine discharge should be 2.25-2.5"
01-15-2008, 04:30 PM
#3
Drifting
Thread Starter
Hey ... thanks Lou. I follow you over on the RR side of the forum.
Well that makes me feel a lot better. I pulled all of my SCCA stuff and built a 2.0L SPI engine and dropped in the car. Ran that all last season but without a tune it was about the same as the Rousch engines. I "think" I can now modify the Escort ECU with the J3 port chip. I just don't have a lot of that knowledge like you do.
I want to use this little turbo in the worst was and I think it will be a hoot if I can make it work and I am hoping for ~ 150-60 Hp. Space is the major problem at the moment.
Another Q. Since I run a MAF I assume I need to use a BOV and then port that back to the inlet of the turbo. Is that accurate? If so, can you recommend a unit to do that with? I see that most of them require a flange to bolt them to. My inlet plumbing in the SRF is all silicone hose 2.5".
Thanks,
Rex
Well that makes me feel a lot better. I pulled all of my SCCA stuff and built a 2.0L SPI engine and dropped in the car. Ran that all last season but without a tune it was about the same as the Rousch engines. I "think" I can now modify the Escort ECU with the J3 port chip. I just don't have a lot of that knowledge like you do.
I want to use this little turbo in the worst was and I think it will be a hoot if I can make it work and I am hoping for ~ 150-60 Hp. Space is the major problem at the moment.
Another Q. Since I run a MAF I assume I need to use a BOV and then port that back to the inlet of the turbo. Is that accurate? If so, can you recommend a unit to do that with? I see that most of them require a flange to bolt them to. My inlet plumbing in the SRF is all silicone hose 2.5".
Thanks,
Rex
01-15-2008, 04:31 PM
#4
Racer
I agree with Louis! 2.5" would be a good choice. I wouldn't be surprised if you saw full boost at 8psi a little before 2500k on a 2.0L with that size turbo and a 2.5" downpipe.
01-15-2008, 05:47 PM
#5
Former Vendor
With the MAF, if you are using it pre-turbo, as in draw through, you will want to route it back in, after the maf. Its already metered air, no reason to stick it back inline to get re-metered as it will run rich.
If you are running it blow thru, you can vent it to atmosphere, as long as the BOV is pre-maf.
If you are running it blow thru, you can vent it to atmosphere, as long as the BOV is pre-maf.
01-15-2008, 05:54 PM
#6
Hey ... thanks Lou. I follow you over on the RR side of the forum.
Well that makes me feel a lot better. I pulled all of my SCCA stuff and built a 2.0L SPI engine and dropped in the car. Ran that all last season but without a tune it was about the same as the Rousch engines. I "think" I can now modify the Escort ECU with the J3 port chip. I just don't have a lot of that knowledge like you do.
I want to use this little turbo in the worst was and I think it will be a hoot if I can make it work and I am hoping for ~ 150-60 Hp. Space is the major problem at the moment.
Another Q. Since I run a MAF I assume I need to use a BOV and then port that back to the inlet of the turbo. Is that accurate? If so, can you recommend a unit to do that with? I see that most of them require a flange to bolt them to. My inlet plumbing in the SRF is all silicone hose 2.5".
Thanks,
Rex
Well that makes me feel a lot better. I pulled all of my SCCA stuff and built a 2.0L SPI engine and dropped in the car. Ran that all last season but without a tune it was about the same as the Rousch engines. I "think" I can now modify the Escort ECU with the J3 port chip. I just don't have a lot of that knowledge like you do.
I want to use this little turbo in the worst was and I think it will be a hoot if I can make it work and I am hoping for ~ 150-60 Hp. Space is the major problem at the moment.
Another Q. Since I run a MAF I assume I need to use a BOV and then port that back to the inlet of the turbo. Is that accurate? If so, can you recommend a unit to do that with? I see that most of them require a flange to bolt them to. My inlet plumbing in the SRF is all silicone hose 2.5".
Thanks,
Rex
it would run better with a diverter valve over the blow off valve
