The newest 100% bolt on Greddy Hybrid turbocharger!
08-16-2010, 03:02 PM
#901
if you have a boost leak, you shouldnt be on the dyno. if it is small and located in a way that you couldnt know about it, well thats just life. But if you have a leak that big, you have no business being on the dyno, or driving the car, or probably owning it if you dyno it like that
I know I was gaining 30ish g/s from a vac leak at the turbo inlet that was fixed just by adding another thickness of gasket paper.
Seeing as we are on this subject and it seems to be relavent to this thread lets discuss it some more .
How can you get 400g/s MAF and make less than 300whp ? I can think of 3 possibilities :
1/MAF is scaled wrong
2/Boost leak
3/Stuffed engine IE low compression
Can anyone think of any others ?
08-16-2010, 06:35 PM
#903
Yeah - bad timing and over rich will cut the power back but wouldn't flow suffer as well ?
I've seen 10whp lost from being over rich ie 10.5 afrs vs 11.5
With timing - I would imagine it would need to be 10-15 degrees off optimal to make a big difference ?
I've seen 10whp lost from being over rich ie 10.5 afrs vs 11.5
With timing - I would imagine it would need to be 10-15 degrees off optimal to make a big difference ?
Last edited by Brettus; 08-16-2010 at 06:46 PM.
08-16-2010, 06:39 PM
#904
Hard to say, I've never been able to do better than 10-15 WHP on a V-8 with timing, and only 3-4 on a rotary (due to not being able to be too aggressive.
However if you run stupid retarded (like 5 ATDC at 7000 RPMS) I would imagine you would see a big dip in power.
However if you run stupid retarded (like 5 ATDC at 7000 RPMS) I would imagine you would see a big dip in power.
08-16-2010, 06:52 PM
#905
Bad compression is an interesting one . More air will blow past the seals and waste power but will overall flow go down or stay the same as a heathy engine ? 
My thoughts are that flow will stay the same but whp will suffer as the efficiency of the engine decreases.
My thoughts are that flow will stay the same but whp will suffer as the efficiency of the engine decreases.
Last edited by Brettus; 08-16-2010 at 06:54 PM.
08-18-2010, 08:17 PM
#907
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man.. i just read through this whole thing. is this mod still being offered? im not looking for anything beyond 270 hp. just wanted more reliability out the t618z
Last edited by gh0st; 08-18-2010 at 08:23 PM.
08-21-2010, 12:49 AM
#910
Tailgaters beware
I am now only about 2.5 hours away from RX7 store and they are offering it.
We are just trying to find some more information on cars running the upgrade.
I will most likely be getting this mod but I still would like to see more proven results, and hopefully by the time I'm ready there will be.
08-24-2010, 04:38 PM
#911
Turbocharger Guru
Thread Starter
Hello all.
I have this Greddy upgrade here that I have fabricated a wastegate actuator bracket for an adjustable/universal actuator. I just want to make sure that it will fit on the car w/o fitment problems.
Let me know if its a big fat negative or if its good. I can make all these brackets stamped out, I just want to get it 100% right before I do.
Bryan@BNR
I have this Greddy upgrade here that I have fabricated a wastegate actuator bracket for an adjustable/universal actuator. I just want to make sure that it will fit on the car w/o fitment problems.
Let me know if its a big fat negative or if its good. I can make all these brackets stamped out, I just want to get it 100% right before I do.
Bryan@BNR
08-24-2010, 06:27 PM
#915
That might be my turbo. I should have sent you the greddy actuator. Stupid me...
Here it is. See last picture for the space you have to work with. Tell me what other measurements you need and I will get them for you ASAP.
Here it is. See last picture for the space you have to work with. Tell me what other measurements you need and I will get them for you ASAP.
Last edited by SC-ed; 08-24-2010 at 06:46 PM.
08-24-2010, 08:41 PM
#916
Turbocharger Guru
Thread Starter
MM thanks for the pics and explanation. I have those actuators at my shop. Just too bulky for my taste.
I have used the small diaphram actuators for years and years. Never having problems with control. I preset the crack pressure.
I will make another bracket sometime before the end of the week and try to get it in the correct orientation so I can complete this order. I'll post pics later on in the week. I may laser cut the bracket once I get it placed correctly so it will be easy to replicate.
Bryan@BNR
I have used the small diaphram actuators for years and years. Never having problems with control. I preset the crack pressure.
I will make another bracket sometime before the end of the week and try to get it in the correct orientation so I can complete this order. I'll post pics later on in the week. I may laser cut the bracket once I get it placed correctly so it will be easy to replicate.
Bryan@BNR
08-24-2010, 10:17 PM
#924
I don't care why it works - just that it does work 
but seeing as you mention it .
How can a turbo with the wastegate held partially closed making 10psi make any more heat than one making 10psi using a larger actuator ? When you think about it , the wastegate has to be held in the exact same position either way ..........
but seeing as you mention it .
How can a turbo with the wastegate held partially closed making 10psi make any more heat than one making 10psi using a larger actuator ? When you think about it , the wastegate has to be held in the exact same position either way ..........
Last edited by Brettus; 08-24-2010 at 10:37 PM.