RETed

Bullshit.
The stock turbo cannot sustain 20psi for any significant amount of time.
This has been proven over and over again.


-Ted

J-Rat

iTrader: (2)

Sheesh.. 20 pounds on a stocker just to go 13.4? damn, I went 13.1 on a stocker at 15 PSI falling to 10 PSI.

And do you have any idea how far out of the efficiency range I was at even at 15?!? Let alone 20 or 26 (which I am raising the BS flag too..).

fstrnyou

it may seem that i'm not listening to any of you, but it seems to me that you aren't hearing me quite right.

when at WOT, i didn't have any other choice but to run it at 20psi.
3" TID + 3" Turbo-BackExhaust + Stock WG = 20psi.
that's just how it was.
now that i have a monster ported WG, i don't have to run it like that anymore. as a matter of fact, i've been running 6psi for the past few months.
the glare is really bad in this pic. i couldn't turn the flash off.

TitosToy

i've been told that if you use an open(vented...whatever you call it) BOV, it'll cause your engine to run rich. doesnt running rich mean you use more gas?..

RETed

And you don't seem to get the point...
The engine nor the turbo can sustain 20psi, period.
So you **** is together by an Act of God.

I dunno how you can take a pic of the boost gauge hitting 20psi...
If it were my car doing 20psi, I have a hard time trying to hold the steering wheel with both hands.
So, this implies your car is so slow even with 20psi that you can take the pic?
If that is so, something is SERIOUSLY wrong with your set-up...

I've run 15psi consistently.
I've run it up to 17psi, and I blew up two stock turbos.
At 17psi, it was like the same jump from 10psi to 15psi, although the stock ECU has no idea it's boosting that high.
At 20psi, the stock turbo is so way out of it's efficiency range, that it's just blowing hot air - this should blow up your engine everytime.


-Ted

RETed

This was one of those things that always puzzled me.
If your TPS was set correctly, the stock ECU shuts of all fuel a split second after you lift off the gas pedal.
So I dunno WTF it has to do with the engine running rich...
Go figure...


-Ted

TitosToy

indeed. so who do i pray to so i can do the same?!?!?
maybe the gauge is calibrated wrong???

RockLobster

iTrader: (7)

Maybe the gauge is hooked up to your ear?

J-Rat

iTrader: (2)

He has a Defi setup.. It has memory.. All he does is hit a button and it plays back the run.

Rat

*edit*

Never mind, I just re-looked at the pic, he was driving.. Me = dumb..

RETed

Boost gauge in +.
RPM's about 4,000RPM.
That's pretty convincing if the car was really sitting still!


-Ted

RETed

Actually, I believe those are the entry-level Defi gauges, and it has no playback or P / H functions.
Strike 2!


-Ted

NZConvertible

Open-vented BOV's cause a very brief rich condition when the vent, sometimes causes exhaust flames. The engine doesn't run rich all the time.

Ted's right that the injectors are switched off when you close the throttle, but during the time it takes for the throttle to move from fully open to fully closed fuel is still being injected. Since this fuel was for air that's been dumped out the BOV, it doesn't burn in the engine. It's heated by the engine and exhaust and ignites when it hits the air as it leaves the exhaust pipe, hence the flames.

J-Rat

iTrader: (2)

Shaddup!!..

Funkspectrum

iTrader: (5)

thank you both NZ, Ted...

I've been trying to find a completely simple explanation for this and you guys have given it to me...

Thanks.

fstrnyou

Yes, that's 4k rpms in 4th gear. You are correct, it's the entry-level Defi' gauge. D-gauge i think, not the D-link gauges. And don't pay attention to the A/F gauge, it wasn't hooked up.

Oh, I'm totally getting the point!! I've always known that 20psi was slower than ~15psi or whatever.

What you're not understanding is that I only had 2 choices, 6psi or 20psi. And with 20 being the faster of the two choices, it was bound to happen.

Is it in fact an "Act of God"? Maybe, but I ain't prayin.

HA, you'd have a hard time holding the steering wheel? Maybe you just can't drive worth a darn. BTW, I was driving down the interstate at nearly 80mph already(in the rain). How fast could it possibly accelerate. And get it right, that's a pic of 26psi, not 20.

Would I rather run 15, or 12, or even 10? Hell yeah, but I'm on what they call "a limited budget". Just letting it creep to 20psi was, hmm...i don't know, FREE!!!

But hear me when I say, I've moved on from that just recently. I've had a ported wastegate for some time now. I've already ordered an Rtek 1.5, and it won't be long before I have a Profec.

It really tears me up that no one believes I ran 20psi. Oh well, moving on.

RETed

So what act of stupidity made it that you could only do 6 or 20?


Dude, you have no clue what you're talking about...


Did I say "impossible"?
Here's the dictionary...
http://www.dictionary.com/
Look up "impossible" and "improbable".


-Ted

RedFox

the reason he was eating more gas with the bov on it is probably because he couldnt' keep his foot out of the gas so he could hear the cool *PSHH* sound!

fstrnyou

It was creeping to 20. The only way to keep it down was to either put my stock crap back on or let off the gas. And neither of those options would have made it any fun to drive. And I tried modulating the throttle to keep it at 10-12 psi, but it wasn't the same. Somehow I imagine 10psi at WOT as being much faster than 10psi at part throttle. I'm not saying it was slow at 10, cause it wasnt', but when i floored it, it pulled much harder. But like I said earlier, it was short lived. The TMIC heats up quickly regardless of how fast I was going or how amazingly cold it was outside.

RETed

So much for "moving on"...


-Ted

Sunny_Tk

i have never been more lost in my life! can some body tell me what these terms mean?

cfm's
CPV
FCD
WOT
TID
TPS
Defi setup

and i want to know how to change the boost pressure to 8.5psi on my stock turbo? (wheres the boost controller?)

RETed

Start by looking at the "stickies" list at the top of the page where it lists all the threads.
Pay particular attention to the thread "FAQ for FC".


-Ted

Sunny_Tk

ya about that "RETED", it still does not say what cfm's, CPV, TPS, Defi setup mean. if it did then i wouldnt of ask you guys

RETed

"CFM" is a unit of air flow.
Cubic Feet per Minute

Have no idea what "CPV" means...


This one is in there.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/faq-fc-frequently-asked-questions-2nd-generation-rx-7-a-181219/
TPS = Throttle position sensor

"Defi" is a brand of gauges.


-Ted

Sunny_Tk

thanks! i dont feel like such a newb any more!