[Turbobitt]

I have a few questions about my Turbo.

1 - While building boost and taking some data logs on my computer, I've been noticing a humming noise emmiting from the turbo when I come off the throttle and the turbo is spooling down. This noise sounds suspiciously like interferance. When I remove the air inlet, I can feel no interferance or excessive play.

2 - I am data logging boost and backpressure. I'm finding that my spool up is a little slower than I would like but backpressure is sustained within a few psi of boost up to almost 15 psi. I would like to know if there is an option to reduce the turbine and increase the spool. I believe I can tollerate more back pressure. Ultimatly want to push this to 30-35 psi boost levels and hope to make 1000-1200 hp.
Current tubine measures 96.5 inducer, 89 exducer.

3 - I am interested in logging turbo speed. Can this be modified to accept a speed sensor like a Garret kit or something equivalent ?

4 - While taking my data logs as stated above, turbo started smoking on cold start-up after building boost a few times. Smoke is bad on cold start up but clears once it warms up. Oil pressure is 90 psi cold. but had no issues with this until I started building boost a few times. Why is this ?

I have not talked to my Turbonetics distributer yet and thought I would try this forum.

Allan G.

[Robert]

Originally Posted by Turbobitt

I have a few questions about my Turbo.

1 - While building boost and taking some data logs on my computer, I've been noticing a humming noise emmiting from the turbo when I come off the throttle and the turbo is spooling down. This noise sounds suspiciously like interferance. When I remove the air inlet, I can feel no interferance or excessive play.

2 - I am data logging boost and backpressure. I'm finding that my spool up is a little slower than I would like but backpressure is sustained within a few psi of boost up to almost 15 psi. I would like to know if there is an option to reduce the turbine and increase the spool. I believe I can tollerate more back pressure. Ultimatly want to push this to 30-35 psi boost levels and hope to make 1000-1200 hp.
Current tubine measures 96.5 inducer, 89 exducer.

3 - I am interested in logging turbo speed. Can this be modified to accept a speed sensor like a Garret kit or something equivalent ?

4 - While taking my data logs as stated above, turbo started smoking on cold start-up after building boost a few times. Smoke is bad on cold start up but clears once it warms up. Oil pressure is 90 psi cold. but had no issues with this until I started building boost a few times. Why is this ?

I have not talked to my Turbonetics distributer yet and thought I would try this forum.

Allan G.

Rather than going with a different turbine wheel (which would require a re-balance) I would suggest trying a smaller turbine housing first. The smaller A/R should improve boost threshold (reduce time to spool up) but will as you mentioned before increase back pressure. If you have some room to work with that is the quickest and cheapest option to accomplish your goal. For the smoking if its oil being introduced into the turbine side because of extremely high oil pressure you may need to take a look at the oil drain strategy and make sure it's effective. Depending on the routing of the return line you might need to run a scavenging pump on the drain. For shaft speed no there isn't a way right now that I'm aware of. A couple years back Turbonetics looked at doing this (having a pick up sensor port on the bearing section. ) but there just wasn't a lot of demand for it and it wasn't put into production. As for the noise when the turbo is spinning down are you sure it isn't surge occuring? What size Blow Off Valve are you using?

[Turbobitt]

Originally Posted by Robert

Rather than going with a different turbine wheel (which would require a re-balance) I would suggest trying a smaller turbine housing first. The smaller A/R should improve boost threshold (reduce time to spool up) but will as you mentioned before increase back pressure. If you have some room to work with that is the quickest and cheapest option to accomplish your goal. For the smoking if its oil being introduced into the turbine side because of extremely high oil pressure you may need to take a look at the oil drain strategy and make sure it's effective. Depending on the routing of the return line you might need to run a scavenging pump on the drain. For shaft speed no there isn't a way right now that I'm aware of. A couple years back Turbonetics looked at doing this (having a pick up sensor port on the bearing section. ) but there just wasn't a lot of demand for it and it wasn't put into production. As for the noise when the turbo is spinning down are you sure it isn't surge occuring? What size Blow Off Valve are you using?

Robert,

Thanks for your reply, I don't think there is a smaller A/R housing available ? I currently have a .96 A/R. Please let me know if there are any options. I would be williing to spend some money to make this happen. I could also provide constructive feedback based on my data log capability.

The smoking issue just started to happen after about 9-10 attempts of building boost on the T-brake. Please keep in mind that this is not a completly new build but something that has been proven to work in the past. Blowby seems to be minimal and the feed/drainback stratagy is in line with Turbonetics specification. I would agree that the source is the turbine area.

The noise concerns me but much less than the oil smoke. I'm not 100% sure if its surge but I guess I could be convinced this is normal. I will investigate this further before I get to excited about it and make sure its not driveline related. I never used a BOV before and just started noticing this high speed "Humming" noise.

I've seen speed sensors installed in bearing sections on various VGT's. I've been fortunate to be involved in many dielsel projects and seen a lot of VGT/speed sensors. Would really like to see how I'm performing vs. your published map.

FYI - I really wish you offered this as an option.
http://turbobygarrett.com/turbobygar...structions.pdf

Allan G.

[Robert]

Originally Posted by Turbobitt

Robert,

Thanks for your reply, I don't think there is a smaller A/R housing available ? I currently have a .96 A/R. Please let me know if there are any options. I would be williing to spend some money to make this happen. I could also provide constructive feedback based on my data log capability.

The smoking issue just started to happen after about 9-10 attempts of building boost on the T-brake. Please keep in mind that this is not a completly new build but something that has been proven to work in the past. Blowby seems to be minimal and the feed/drainback stratagy is in line with Turbonetics specification. I would agree that the source is the turbine area.

The noise concerns me but much less than the oil smoke. I'm not 100% sure if its surge but I guess I could be convinced this is normal. I will investigate this further before I get to excited about it and make sure its not driveline related. I never used a BOV before and just started noticing this high speed "Humming" noise.

I've seen speed sensors installed in bearing sections on various VGT's. I've been fortunate to be involved in many dielsel projects and seen a lot of VGT/speed sensors. Would really like to see how I'm performing vs. your published map.

FYI - I really wish you offered this as an option.
http://turbobygarrett.com/turbobygar...structions.pdf

Allan G.

I didn't see an A/R in the original post and didn't know you had a .96 already. You are correct that is the smallest A/R for the Y2K turbine wheel. You are also running the smallest available turbine wheel for that frame already so I don't think there's going to be anything smaller there. I'm surprised you never had surge issues before with no BOV. With that much compressor I wouldn't run without one. The cost of a replacement unit is just too high. As for the speed sensors I know exactly what you mean. Turbonetics did prototype out a set up for this a few years back but it was never released. I'll bring this up to the sales team though.

[Turbobitt]

Robert,

Are you sure about the turbine size being the smalles for this frame ? The Y2K80 I upgraded from had a smaller turbine...

EDIT: I started the car today and did not see any oil smoke. Could this be a fluke ??? I also did a few more data logs whle building boost and no oil smoke issues.

FYI - takes me about 5.5 seconds to build 10 psi boost on the trans brake. Keep in mind that this is a 272 cube engine.

Allan G.

[Robert]

Originally Posted by Turbobitt

Robert,

Are you sure about the turbine size being the smalles for this frame ? The Y2K80 I upgraded from had a smaller turbine...

EDIT: I started the car today and did not see any oil smoke. Could this be a fluke ??? I also did a few more data logs whle building boost and no oil smoke issues.

FYI - takes me about 5.5 seconds to build 10 psi boost on the trans brake. Keep in mind that this is a 272 cube engine.

Allan G.

You can hypothetically run a smaller turbine on a totally custom turbo but that's the smallest available in a standard config

Sent from my MB860 using Tapatalk

[Turbobitt]

Originally Posted by Robert

You can hypothetically run a smaller turbine on a totally custom turbo but that's the smallest available in a standard config

Sent from my MB860 using Tapatalk

Robert,

Thanks again for your replies,

It would be nice to have some flexability with a smaller turbine and adjust spool and back pressure with different A/R housing. It would appear based on my data logs that this current turbine and .96 A/R housing that there would be some oportunities with a smaller turbine option. I say this because I don't k now if I could ever see a 1.5-1.75 turbine to compresser pressure ratio.

What would be the next smallest turbine wheel ??

If you have any more insite to a speed sensor please let me know. I may persue the Garret kit if I can't find another alternative.
.
Allan G.

[Robert]

The next smallest turbine wheel is a F1-68 and that has a variety of turbine wheel options the next one down from .96 is a .81.

[Turbobitt]

Robert,

HOw can I determine if I have an HPC wheel ? The sticker on my backing plate says T-39083 and also 5109 scribbed into it, the compressor housing has 21399 scribed into it.

Allan G.

[Robert]

Originally Posted by Turbobitt

Robert,

HOw can I determine if I have an HPC wheel ? The sticker on my backing plate says T-39083 and also 5109 scribbed into it, the compressor housing has 21399 scribed into it.

Allan G.

TURBO, Y2K-88-89-Y2K0_96

Based on what I see from the serial number its not an HPC wheel. If this serial number hasn't been rebuilt its a Y2K T88 with an F1-89 turbine wheel.