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Old 10-24-2000, 07:40 PM   #1
yebokmj
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Member#: 2213
Join Date: Aug 2000
Chapter/Region: South East
Location: Raymond, NH USA
Vehicle:
1995 Impreza w/EJ257
Brilliant Red

Post What Gauges and Piggy backs needed for Turbo?

I was just reading the post on the JC sport install, and people where talking about their gauges and piggy backs and such. I only plan on running 5 psi (at least for the winter) what should I be purchasing to help me monitor and tune my turbo?
Joshua
MY98 RS
Subaru Salesman
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Old 10-24-2000, 09:52 PM   #2
Pipercub
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Join Date: Aug 2000
Location: Remington VA`
Vehicle:
2004 Impreza STI
82 BRAT with 12 in. lift

Post

Hey man, I am doing my install just down the road in N. VA. The ammount of add ons you need is debatable. With only 5 PSI you dont't "need" much in the way of add ons. A good fuel pump and an SAFC to richen it up where it runs short on fuel is all that is "necessary". However even at low boost detonation can still occur, granted at 5psi you are not pushing things, but why not run the same gear that you would need for higher boost and insure yourself of protected opperation?

I am running a boost guage as a very low cost safeguard and a valuable diagnostic tool. You can watch for boost creap and failure to reach full boost indicating anything from a bad waste gate to a kinked oil line. You can also observe when the car comes "on-boost" letting you know where to watch the mixture for insuficient fuel etc. For $50. you get a lot of insight.

I am also installing an SAFC for several reasons. To adjust the fuel to air ratio is the primary reason for using one. If the injectors need to hang open a bit longer at a certain range you can dial that in. The proper A/F ratio will keep your combustion chamber temps in line, provide the most efficient burn of the mixture, and guard against leaning out and that can contribute to knock. Knock wrecks the engine.

The third and most important item I chose to use is the J&S safeguard. This system provides a multitude of useful functions for a boosted car. First and foremost it monitors for knock and retards the timing if necessary protecting the engine. The unit also optimizes timing in each cylinder for a performance gain. And if you purchase the dual monitor you get a rich/lean meter. Now the real question; is it necessary. At 5 psi it is not an absolute necessity and is probably overkill but it is a strong measure of protection. By running this unit you are taking a huge risk out of turboing the car. My take on it is this: better safe than sorry.

I paid 1k for the SAFC and J&S w/ dual monitor. I know that my mixture will be good accross the band and knock will be aborted should it have circumsances to occur. This makes for a safe and well managed low boost setup, power gain at minimized risk.

With that said you can go with less expensive options such as an ITC to retard the timing as you desire. It is not as efficient or proactive but costs allot less. At the minimum I would say run an SAFC or a RRFPR to keep that mixture right.

And you also have the other end of the spectrum in the installation of a TEC II. This is the $2500. option. The TEC II has higher resolution and even better integration of functions than piggybacks such as SAFCs and J&Ss. You certainly would not be making bad decision in going to that and gain the ability to refine and tune the car at 5 psi with safety and efficiency you cannot do using piggybacks. Of course this is more than what is needed to run 10psi or lower.

So your options range from 500 - 2500. My choice was a midpoint that will support me to 10 psi and 8 is where I intend to settle. I do plan to got to a TEC II eventually.

What I am doing here is going with a package of a low boost turbo with good protection and management. There is higher boost and better management at over twice the price, but that does not negate all others.

If you want my reccomendation, get a boost guage and an safc at a minimum. Then add a J&S as soon as you can if not right away.
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Old 10-25-2000, 05:58 AM   #3
imprezive
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Member#: 746
Join Date: Jan 2000
Chapter/Region: South East
Location: FL
Post

s-afc,fuel pump, ITC, boost guage is the bare minimum.
Do a search on "stage I" under my name in the general forum and that should turn up some info.
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Old 10-25-2000, 07:47 AM   #4
yebokmj
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Member#: 2213
Join Date: Aug 2000
Chapter/Region: South East
Location: Raymond, NH USA
Vehicle:
1995 Impreza w/EJ257
Brilliant Red

Post

I can't seem to find it with no general forum existing anymore as a search option.
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Old 10-25-2000, 01:16 PM   #5
imprezive
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use the misc, non-technical
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