Safe setup?
06-06-04, 02:58 AM
#1
Senior Member
Thread Starter
Join Date: Mar 2004
Location: AZ/CA
Posts: 485
Likes: 0
Received 0 Likes
on
0 Posts
Safe setup?
Alright, im not too familiar with the order of what needs to upgraded after what in order to keep my car running safely. I know people say that "with this upgraded now you must add this or your car will explode" The car is a 10thAE with a
-J-SPEC S4 turbo motor
-greddy intake
-no smog pump (A.C.V still in place, just plugged up)
-Bonez race exhaust with a 2.5" downpipe, 3" midpipe 3"-1.75" Y-pipe and stock mufflers (for back pressure).
-No P.S or A.C
-No charcoal canister
-Stock fuel pump + injectors
I was just wondering is my car safe running this setup?
THANKS!
-J-SPEC S4 turbo motor
-greddy intake
-no smog pump (A.C.V still in place, just plugged up)
-Bonez race exhaust with a 2.5" downpipe, 3" midpipe 3"-1.75" Y-pipe and stock mufflers (for back pressure).
-No P.S or A.C
-No charcoal canister
-Stock fuel pump + injectors
I was just wondering is my car safe running this setup?
THANKS!
06-06-04, 02:55 PM
#5
Eats, Sleeps, Dreams Rotary
iTrader: (1)
Join Date: Jun 2001
Location: London, Ontario, Canada
Posts: 3,106
Likes: 0
Received 0 Likes
on
0 Posts
Have you run your car, what are you boosting to? I would suggest that you will be overboosting but to what degree I'm not sure. The wastegate on the S4 Turbo is small, so once you go past a certain threshold with a lower backpressure exhaust it cannot properly vent excess boost. To be safe, once you pass that threshold you probably want to port the wastegate so it's larger and able to cope with this situation. You're going to want a fuel cut defenser (FCD) because once you run above 8.6psi the ECU will cut fuel to the rear rotor. (bad when you are intentionally running more boost) Again depending on how much boost you end up running you'll need to do something like a fuel pump rewire.
I had a 2.5" straight through exhaust with only a muffler and I boosted a only a couple of PSI above stock, so I was still safe without doing anything beyond a FCD. If you're going beyond fuel cut you need to start doing something about fuel.
I had a 2.5" straight through exhaust with only a muffler and I boosted a only a couple of PSI above stock, so I was still safe without doing anything beyond a FCD. If you're going beyond fuel cut you need to start doing something about fuel.
06-06-04, 04:01 PM
#6
#1 Certified Cone Killer
Join Date: Mar 2002
Location: Battle Creek, MI
Posts: 936
Likes: 0
Received 0 Likes
on
0 Posts
you should at least have an FCD with that intake and exhaust. You also should install an aftermarket boost guage and watch it very closely to make sure you are not creaping.
06-06-04, 05:36 PM
#7
Senior Member
Thread Starter
Join Date: Mar 2004
Location: AZ/CA
Posts: 485
Likes: 0
Received 0 Likes
on
0 Posts
How can i tell whether or not im hitting the fuel cut or not? Im up at 4500ft and whenever i get to WOT nothing unusual happens, but in phoenix (2000ft) it kinda jerks around a bit @ WOT. I have an aftermarket boost guage and i am boosting somewhere around 9 or so.
Oh i have also been driving the car for aboout a year now, some mods have been recent though
Oh i have also been driving the car for aboout a year now, some mods have been recent though
Trending Topics
06-06-04, 05:59 PM
#11
Eats, Sleeps, Dreams Rotary
iTrader: (1)
Join Date: Jun 2001
Location: London, Ontario, Canada
Posts: 3,106
Likes: 0
Received 0 Likes
on
0 Posts
Creep is what you're experiening when you run at 8.5-9psi. What is happening is that your wastegate isn't properly controlling your boost and it is running higher than Mazda designed it to. You need a FCD and probably a fuel pump rewire to ensure that you're fuel pump is operating at full 12V.
Rewire info: http://fc3spro.com/TECH/MODS/preliminary.htm
Rewire info: http://fc3spro.com/TECH/MODS/preliminary.htm
06-06-04, 06:40 PM
#13
Rotary Enthusiast
Join Date: Sep 2002
Location: Statesboro, GA
Posts: 1,233
Likes: 0
Received 0 Likes
on
0 Posts
Fuel pump rewire is nothing more than using new wires to carry all the amps to the pump.
Boost creep is when the boost level rises above what the stock wastegate is set to. In your case, 5.5psi. At 5.5 psi, the wastegate is full open and as your rpms increase, the boost rises/creeps higher because the wastegate hole is too small to adequately vent exhaust around the turbine wheel. I was curious as to why you kept the stock mufflers "for backpressure". In a turbo'd car, all backpressure does is help keep boost down.
With my stock intake and full exhaust and otherwise stock motor, I hit 10psi at around 5k and then begins to fall off to around 7psi due to the very restrictive stock intake system. When I put my 3" intake on, my boost rockets to 17psi by 5k and stays there till redline.
And to answer the main question:
with no other mods, you should have enough fuel for those HP levels. Wouldn't hurt to upgrade the fuel pump to a walbro and get an FCD just to be safe. Fuel cut is quite obvious when you hit it.
Boost creep is when the boost level rises above what the stock wastegate is set to. In your case, 5.5psi. At 5.5 psi, the wastegate is full open and as your rpms increase, the boost rises/creeps higher because the wastegate hole is too small to adequately vent exhaust around the turbine wheel. I was curious as to why you kept the stock mufflers "for backpressure". In a turbo'd car, all backpressure does is help keep boost down.
With my stock intake and full exhaust and otherwise stock motor, I hit 10psi at around 5k and then begins to fall off to around 7psi due to the very restrictive stock intake system. When I put my 3" intake on, my boost rockets to 17psi by 5k and stays there till redline.
And to answer the main question:
with no other mods, you should have enough fuel for those HP levels. Wouldn't hurt to upgrade the fuel pump to a walbro and get an FCD just to be safe. Fuel cut is quite obvious when you hit it.
06-06-04, 08:53 PM
#14
Senior Member
Thread Starter
Join Date: Mar 2004
Location: AZ/CA
Posts: 485
Likes: 0
Received 0 Likes
on
0 Posts
So im going to go for a FCD next for sure. No other mods in the near future, but if i do go for a walbro fuel pump will i need to tune it with an S-AFC or something? What i mean is will i be running richer than i am now?
so your also saying i dont need to keep those stock mufflers on there? i always thought that small displacement engines need some sort of back pressure to run off of. if thats true then im going to upgrade them
so your also saying i dont need to keep those stock mufflers on there? i always thought that small displacement engines need some sort of back pressure to run off of. if thats true then im going to upgrade them
06-06-04, 09:01 PM
#15
Originally posted by fusion-turbo
so your also saying i dont need to keep those stock mufflers on there? i always thought that small displacement engines need some sort of back pressure to run off of. if thats true then im going to upgrade them
so your also saying i dont need to keep those stock mufflers on there? i always thought that small displacement engines need some sort of back pressure to run off of. if thats true then im going to upgrade them
06-06-04, 09:23 PM
#18
Senior Member
Thread Starter
Join Date: Mar 2004
Location: AZ/CA
Posts: 485
Likes: 0
Received 0 Likes
on
0 Posts
This brings me to my next question, if i do replace the mufflers with an aftermarket system i will be running more h.p and more boost. im at about 8.5-9 psi right now, how much boost will i push if i do the mufflers, and how much boost can i run safely without having to get an aftermarket fuel pump and S-AFC?
06-06-04, 10:13 PM
#20
Eats, Sleeps, Dreams Rotary
iTrader: (1)
Join Date: Jun 2001
Location: London, Ontario, Canada
Posts: 3,106
Likes: 0
Received 0 Likes
on
0 Posts
I wouldn't go with more boost if you don't want to buy a S-AFC. Currently you're running towards the end of the safe range. If you get a better catback you'll boost substantially higher and need more fuel. Don't take my word for it take a look at the following link. It spells out approximate mod levels and what you need with them: http://fc3spro.com/TECH/FM2W/power.htm
I also think the HP numbers stated on the page are a tad low for the boost levels. My car running just a tad over stock boost produces nearly as much power as "Stage II":
http://www.geocities.com/jeffguilfoil
(go to the dyno page)
I also think the HP numbers stated on the page are a tad low for the boost levels. My car running just a tad over stock boost produces nearly as much power as "Stage II":
http://www.geocities.com/jeffguilfoil
(go to the dyno page)
06-06-04, 10:54 PM
#24
Senior Member
Thread Starter
Join Date: Mar 2004
Location: AZ/CA
Posts: 485
Likes: 0
Received 0 Likes
on
0 Posts
How do i go about rewiring the fuel pump? How far back should i replace the wiring? what gauge? it would be cool if there was a write up, it doesnt say how to do the procedure on the link.
Also for porting the wastegate, i know i have to remove the turbo, but is there a gasket or something i should get prior to the procedure for re-installation?
Also for porting the wastegate, i know i have to remove the turbo, but is there a gasket or something i should get prior to the procedure for re-installation?
06-07-04, 12:20 AM
#25
Eats, Sleeps, Dreams Rotary
iTrader: (1)
Join Date: Jun 2001
Location: London, Ontario, Canada
Posts: 3,106
Likes: 0
Received 0 Likes
on
0 Posts
NP, just noticed that the times we posted are 1 min apart, so my post might not have been up when you were posting.
There are three gaskets sort of in that area. There's the engine to manifold, manifold to turbo and turbo to downpipe backplate. They're metal gaskets and it is possible to reuse them, but some peple don't feel comfortable reusing them. Some people feel comfortable reusing the turbo to downpipe backplate, but not the crushable metal gaskets. It's your call.
As for how to rewire, that's discussed in this thread:
https://www.rx7club.com/showthread.p...el+pump+rewire
If you don't find everything you want there, do a search and I'm sure you'll find it.
There are three gaskets sort of in that area. There's the engine to manifold, manifold to turbo and turbo to downpipe backplate. They're metal gaskets and it is possible to reuse them, but some peple don't feel comfortable reusing them. Some people feel comfortable reusing the turbo to downpipe backplate, but not the crushable metal gaskets. It's your call.
As for how to rewire, that's discussed in this thread:
https://www.rx7club.com/showthread.p...el+pump+rewire
If you don't find everything you want there, do a search and I'm sure you'll find it.