TC 78 Limits?
TC 78 Limits? I have been running a turbo set up on the street for a couple of years at around 11# of boost. (no track around here) I decided this year to up the boost, I replaced the tc 76 with the new tc 78. Put some slicks on & found some secluded roads.
Well I could not get to 15#'s so I replaced the MBC with one that I know is good. I finally got to about 16 on my guage but I have yet to hit 210 KPA on HP Tuners? It hits 205 which doesn't jive with my guage right? It makes some nice power but I am wanting more. LOL
My question is can I be out of turbo? I have a 347 with afr heads, a nice free flowing kit with open down pipe. Here is another piece of the puzzle, I am at around 3500 to 4000 feet in elevation.
All my pipes are nice & tight, I don't think I have any leaks.
Well I could not get to 15#'s so I replaced the MBC with one that I know is good. I finally got to about 16 on my guage but I have yet to hit 210 KPA on HP Tuners? It hits 205 which doesn't jive with my guage right? It makes some nice power but I am wanting more. LOL
My question is can I be out of turbo? I have a 347 with afr heads, a nice free flowing kit with open down pipe. Here is another piece of the puzzle, I am at around 3500 to 4000 feet in elevation.
All my pipes are nice & tight, I don't think I have any leaks.
I just did some runs tonight & really it stayed mostly around 195 KPA no matter how much I turned the MBC up. It also ran my injectors up to 80 to 83 % DC at 11.0 to 1 afr spraying meth. So I am probably pretty close to max on my fuel.
Yes I have read everything about this turbo on this site. I'm just trying to figure my boost #'s.
I just did some runs tonight & really it stayed mostly around 195 KPA no matter how much I turned the MBC up. It also ran my injectors up to 80 to 83 % DC at 11.0 to 1 afr spraying meth. So I am probably pretty close to max on my fuel.
I just did some runs tonight & really it stayed mostly around 195 KPA no matter how much I turned the MBC up. It also ran my injectors up to 80 to 83 % DC at 11.0 to 1 afr spraying meth. So I am probably pretty close to max on my fuel.
TECH Addict
Joined: Jul 2005
Posts: 2,153
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Boost controllers are limited by what the wastegate can or can't do. Wanna see the real limit of the turbo? Install a block-off plate before the wastegate and be prepared to replace head gaskets at minimum. I believe that turbo can make 20+ psi on your motor.
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Verdad Gallardo I bought the WG from you guys, I think it was a 38mm Ultra? If I remember correctly. What can I get that will bolt in it's place? I don't have a lot of room for one that is physically much larger
You don't need a bigger gate...just more spring tension. Have you stacked the springs that came with the gate. The Ultra's came with extra springs to stack up the tension on the valve.
Can I buy some from you ASAP, I am travelling to wa state to run this thing on a track this sat.
We have done 19-20psi with a tc76 on the street with a 6l. 14psi on this vehicle was worth 654rwhp with a auto and 22" wheels. That one run at 19-20 killed the turbo though. Chris now keeps it below 15 with the new unit.
How did it kill the turbo? Did it overheat? Also about the WG would an EBC fix his boost problems and allow him to go to higher boost? Is he needing a heavier spring because he is running a MBC?
so would a tc76 be able to make more power on a 5.3 or a smaller motor because of backpressure?
