Dan

here are my mods. intake,dp,mp,cb,boost hose upgrade, and stock ecu "yes stock" (you will not pop a motor as long as you can control the boost).
I just went non sequential and instal the mid pipe. I also did the home depot boost controler. I have the thing opened all the way. in 3rd gear im boostin up to 17psi............... J/K . No, but in 3rd with about 6000rpm im already up to 11-12 psi and then I know its time to back off. did I do somthing wrong when I went non sequential or is the mid pipe to big of a mod.
Also if the home depot boost controler wont do the job would a real one work better "like the profect B".
And yes I know I need a ecu.

GsrSol

The mp is a huge mod that will cause boost creep. Have you turned the bc all the way down? You may need to set it at about 8psi that way it might only spike to 10psi.

7-sins

You really should invest in a ECU with a MP. Right now your like walking on glass with that motor.

Mahjik

iTrader: (1)

Dan,

Every car seems different, but usually with a midpipe, most people need to port the wastegate or add some restrictors on the exhaust to add a little back pressure.

Here's a good thread about the discussion:

https://www.rx7club.com/forum/showth...threadid=26389

Want2race

boost creep with the wastegate... Pull the turbos, port it and hope it works... But keeping it @ 10psi is gonna be tough..

Not to mension you ARE running lean if you have a stock ecu... even though boost is the same level airflow is increased while fuel flow is not!

Dan

No, I must be getting good fuel flow, because when desending from a high rmp it back fires real loud. "I think Im shootin flames"

twinturborx7pete

iTrader: (3)

you aren't a smart one if you are running all those mods with a stock ECU.. its a miracle your motor hasn't grenaded yet.

GsrSol

You will get those backfires anyway, only difference is now you can hear them.

Dan

even if I had a ecu, what the hell can I do for the boost?

the_saint

Port your wastegate.

Dan

well I just went out and put my silencer in my gt spec with the boost controler wide open and now im getting 7psi all the way to red line.......I guess this will do until I get a new ecu and my waste gate ported..

Van Sema

iTrader: (1)

Dan ...

How did you do the homemade boost controller? And how effective is it?


While we are on the subject ... this has been bugging me and i can't seem to come up with the answer.

If you put all these mods on the car ... i.e. full exhaust, intake, intercooler, ignition etc. ... but you limit the car to stock boost level (10psi), will you be making anymore HP? The arguement i'm having is if you limit the car to stock boost levels ... the car won't/can't make any more HP over stock?

If anyone understands this ... please lemme know

Want2race

I am having a great deal of difficulty believing you.

A silencer will not drop your boost by 4psi. I dont care what anyone here says.

Secondly the factory specs say the lowest you can go is 8psi as set by the wastegate spring.

Thirdly- The motor would have popped with those mods REGARDLESS of boost pressure. The fact that your now flowing @ least 20% more air would cause that alone.

and Finally- There is no way in hell an FD with a GT catback, a midpipe, and a downpipe without some sort of baffle or restrictor plate will EVER be able to hold 7 psi! The damn wastegate hole is 1.12" last time i checked mine. that means for you to be flowing all that air thru would mean your flowing IN EXCESS of 3500cu Liters of air @ redline.. and that ***** just not happening. The Physics are slightly out of your favor. Increase that hole to 1.25" like the educated forum members and your now only MARGINALLY keeping the boost from creeping. Most of the air goes thru the turbo and never see's the wstegate but as cycle duty increases you are diverting more air into the wastegate area and thus it needs to flow though...

So there is either something your not telling us OR your the LUCKIEST SOB on the fact of this planet!

Dan

Well, Im not bull shitting here. I am really only getting 7 psi. If you dont beleive me have someone on the forum come over and I'll take them for a ride. In fact it cut it more than 4 psi, because I couldn't go w.o.t to red line because of boost creep. It would have probly have gone up to 15 or 16.
Van I hear you, I did the g-tech test with only 7 psi and I pulled a 14.18 " I think thats good with only 7 psi" I guess its hard to answer your question because im not running the same boost as before. One thing to keep in mind, is that with all of these mods your gona be faster because of the weight reduction.

Dan

nobody has to believe me. When at w.o.t. you can here the exhaust flowing because it hits the silencer. It almost sounds like a wistle. I know it sounds like b.s. but its true. I wish someone on this forum lived closer for that they could back my word up. Now my car is not back firing as loud " I dont think I can shoot any flames now" . This is all I can tell you people. I dont know if my car is running right or not but for now im gona leave it alone until I get the ecu and waste gate ported

RotaryKnight

Dan- Yea with the GT silencer in I can see you getting less boost. If you guys have ever seen that silencer the outlet looks like 1 1/2" it's tiny.

One of my friends would boost a bar w/o and only .8 with it in. His car was tuned for a bar with the PFC. But of course tuning was done w/o the silencer.

Dan, typically the reason why you need an ECU is that the stock system cannot adjust to the turbo spooling up so fast. The stock internal WG usually get overwhelmed. They can't keep up with the increased flow that a DP, MP and good exhaust give.

I suggest like you said to keep that silencer in till you get some type of fuel control and good boost control.

RotaryKnight

Want2Race- Yea man it baffles us too but the damn silencer in won't allow full boost.

With my HKS Hiper I never noticed it, well maybe alittle where the silencer would not allow my preset boost levels. But DAMN on my friends GT......that silencer sure sucked performance. I drove his car too and the damn thing would boost less with the silencer in.

Dan

ha ha told ya so

93TTRX7

it's not only the ecu that is of concern...but your fuel system as well...even if you get the ecu, get a better fuel pump

nrolfes1

hey dan where in michigan are you? i'm in livonia area. i installed the home depot (actually its nankin hardware) boost control device, and it took me like a month of tuning to dial that thing in exactly how i wanted it---it is dam finicky...and then my transmission took a sh#t, so i'm tearing that apart now. anyway, i'd be interested in seeing your setup, i've got a straight pipe (dp/mp/borla) setup i'm tempted to put in my car but haven't done so due to how loud it is.

i've removed the air pump and am running very rich, i think it might be enough to offset a dp/mp/borla exhaust as long as i keep the boost regulated to 10 psi through some means or another.

KevinK2

Dan, if u plug the 2nd wg actuator port (goes to sol-valve) then u might be able to control boost with valve wide open at 1st, then start closing it for an attempt at 10 psi steady boost. If it works, a dyno run with wide band would likely show enough fuel with higher hp, esp if oem toy IC is in place.

Van Sema

iTrader: (1)

I heard if you take all the pills out of the stock twin turbo system ... it only boosts to like 6-7 psi

That's what i'll be doing when i get my car from the shop ... good low boost to break my motor in.