Regulating twins at 5 psi ?
Regulating twins at 5 psi ? On a twin setup, if I want to run no more than 5 psi, how shoul dit be regulated? Let's say I have two wategates. Are they both set to 5 psi then?
Jeff
Jeff
Most twin setups run external gates like the tials..You simply change out wastegate springs to set your minimum boost. You go up on boost over the wastegate springs with a boost controller .You cannnot use a boost controller to go under the spring minimum.
Also the springs can limit how high you can go so you might need to go higher on the minimum boost in order to hit a higher max boost. Eg a 5 psi spring may only let you go to 10psi max..pulling this number out of my hat..You would then need a 10psi spring to hit 15psi. Again pulling this number out of hat. Some guys shim the springs to hit higher boost levels.
Also the springs can limit how high you can go so you might need to go higher on the minimum boost in order to hit a higher max boost. Eg a 5 psi spring may only let you go to 10psi max..pulling this number out of my hat..You would then need a 10psi spring to hit 15psi. Again pulling this number out of hat. Some guys shim the springs to hit higher boost levels.
the typical rule of thumb is that you can double the wastegate spring with a controller.
To answer your question i hope they are small twins, and i would suggest the BIGGEST wastegates you can find. they bigger the gate the better it is at keeping boost lower. If you get two gates that are too small it will boost creep.
To answer your question i hope they are small twins, and i would suggest the BIGGEST wastegates you can find. they bigger the gate the better it is at keeping boost lower. If you get two gates that are too small it will boost creep.
Hmm. I have some more research/reading to do then. Not as simple as I thought I don't think.
Yes, I was planning on external gates.
They are SC61's (.63 exh .70 compressor). Maybe 5psi is too low. Let's say 7psi. It's a stock LS6. Eventually I will lower the C/R but not yet.
What's boost creep? Where it's not blowing off enough PSI and it basically continues to build?
So you set minimum boost, not maximum boost? I guess I understood how they work to be incorrect. I assumed once a certian level is reached, it opens, blows off excess.
Thanks,
Jeff
Yes, I was planning on external gates.
They are SC61's (.63 exh .70 compressor). Maybe 5psi is too low. Let's say 7psi. It's a stock LS6. Eventually I will lower the C/R but not yet.
What's boost creep? Where it's not blowing off enough PSI and it basically continues to build?
So you set minimum boost, not maximum boost? I guess I understood how they work to be incorrect. I assumed once a certian level is reached, it opens, blows off excess.
Thanks,
Jeff
I ran 2 t3/t4 hybrids last year, kinda small i guess and twin tial 38mm's and with the .4 bar springs in each the boost stayed right around 5.5 creeping to right around 6 with cutouts open. Hope this helps.
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