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Old 02-16-2001, 09:30 AM   #1
SCRAPPYDO
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Datsun 71 240Z & 68 2000

Post JC Sports Turbo Kit/experiences

I have an interesting question. I have never entertained the idea of adding a turbo to my car until recently. I was looking at the JC kit, as most of you have, and was wondering if when installed and set to run at 5 psi, if I would need to do anything else to make it run reliably and without any problems. I have no desire to run more than 5 psi as reliably is very high on my priorities. An electronic boost controller is probably something I would want to buy to keep the boost at exactly 5psi.

I know that some people might say I can run 7 psi reliably, I am not interested in that. I always wanted to go the route of cams for my extra ooph, but was very worried about the ability to get the car smogged afterward. With a turbo, I can simply unbolt everything and go get it smogged with no problem.

So the question stands, is the kit robust enough to be reliable as a daily driver without needing anything else?

I am sure this has been answered somewhere in the million posts on turbos…. But if its not to much trouble I would really appreciate any info.


Thanks!
SCRAPPYDO
stephen
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Old 02-16-2001, 10:12 AM   #2
GTBGUY
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'98 QS Legacy L (auto)

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Well, if you want the ultimate in streetability, go with the basic IHI turbo and run 5psi. This should not cause any sorts of reliability problems, one good upgrade at that time would definately be the clutch (ie pressure plate, disc etc).
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Old 02-16-2001, 12:19 PM   #3
tluzziracing
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i have it and it is awsome! very reliable.

[This message has been edited by tluzziracing (edited February 16, 2001).]
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Old 02-16-2001, 12:23 PM   #4
ColinL
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Instead of using the JC Sports kit which has the IHI RB52 turbo from the 91-94 160HP Legacy Turbo, why not at least use the Mitsubishi TD04 turbo from a new 227HP WRX?

There are 3 ways to acquire one:
  • *Crashed WRX. (sad thought, but it will happen)
    *Upgraded WRX. Alex will be installing a Cusco equal length header and IHI VF22 on his WRX, so there's a header and turbo right there.
    *Buy the parts new from Troncalli, QSubaru, Subaruparts.com, etc. I have no idea on prices and how feasible this is, but I bet we can get the part numbers very soon and find out.

[This message has been edited by ColinL (edited February 16, 2001).]
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Old 02-16-2001, 12:26 PM   #5
Eric SS
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Just so you know, Anyone who says that they are happy with a certain amount of boost Is going to be in for a big surprise You'll want 7, then 9, then etc...

Eric
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Old 02-16-2001, 12:34 PM   #6
HamFist
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The JCS wagon passed emissions burning CLEANER than stock at 7psi. I was very impressed. Extra injectors are the way to go if you want better tunability. They blow the RRFPR away.

Gary
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Old 02-16-2001, 12:43 PM   #7
SCRAPPYDO
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Imprezanator..

that wont happen with me. I am pretty satisfied with the performance of my car as is. Knowing that 5 psi is easier on the engine than 9 is very relaxing to me. I have seen WAY to often the effects of getting happy with NOS (boost/nos, same thing easy power). So I will be perfectly happy with the drastic increase that a 5psi turbo will give.

I have no illusions that it will be all that fast with a turbo. It will be peppy and quick, but not fast. It should prove to be a very reliable daily driver that has the ooph I am looking for.

SCRAPPYDO "may be thinking turbo" hummmm

just so I dont get flamed for this... Fast is not mid 13's in the quarter. Fast is low 12's high 11's. And no way will 5 psi get me their.

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Old 02-16-2001, 12:56 PM   #8
DaveK
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Nobody's mentioned this yet, but taking off the turbo kit and re-installing so you can pass emissions isn't a small task.
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Old 02-16-2001, 02:27 PM   #9
RyanC
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Extra injectors are the way to go if you want better tunability. They blow the RRFPR away.

Uh, no. The TEC-II is the way to go if you want better tunability, extra injectors are a band aid

[This message has been edited by RyanC (edited February 16, 2001).]
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Old 02-16-2001, 02:41 PM   #10
HamFist
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I was about to mention CARB legality on the TEC II...but I'm not even sure if the extra injectors are legal either . They still kick ass over the RRFPR. I could tell the difference. But, I'm not going to try and convince you of it, because no one here believes non-vendors anyway .

Gary
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Old 02-16-2001, 10:41 PM   #11
ImprezaRS dot com
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I added a 5 psi JCS IHI turbo kit to my MY00, with only a weapon-r style presure regulator and an AFC initially.

It ran decently well at 45 psi fuel pressure, well enough to spin the stock clutch on the third day, but the AFC was useless over 5,000 rpm on a my00 with MAP sensor, although it is helpful on a car with an MAF.

The RRFPR was a godsend, and made it much easier to tune the car by EGT's. The original 45 psi was too much for a smooth idle, and too little for full boost; but the RRFPR can now be set to keep fuel pressure under 40 psi at idle and over 70 psi with 5lbs boost.

I can now run upwards of 9 psi at 6,000 feet altitude without an ITC or J&S knock sensor, but with barely enough fuel. I am adding the extra injector bandaid soon... I also replaced the AFC with a JCS torque chip II and it watches acceleration like a road dyno and helps adjust the fuel to keep the acceration curve the fastest (watching RPM and speed increase over time).

Boost is addictive, and 5 psi just aint the same fun as 7 anymore, and 9-10 psi is looming on the horizon. Up here at 6,000 feet with my stock pistons, 10 psi boost is the same absolute compression ratio of 12.97:1 as running 8 psi at sea-level. Interestingly, my cheap Blitz Dual Mode boost controller ($225 used) eliminates boost spike but not boost creep. i.e. without it I could hit the gas and spike to 8 psi and drop back to 5 right away, but in 4th and 5th would creep back to 7 psi under load at low rpm - the spike is now gone and spoolup is faster, but the creep is still there. Wierdly enough, when set to 7 psi there is still NO boost spike but the boost creeps to 9 in higher gears under load, even though the boost controller could disengage and let it drop back to the the factory creep of 7 psi...

So, if you want to stay at 5psi, skip the boost controller, or you will keep experimenting with more boost, till you OD on boost crack!

Larry www.ImprezaRS.com
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Old 02-17-2001, 12:08 AM   #12
tluzziracing
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very true larry.
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Old 02-17-2001, 01:28 AM   #13
Eric SS
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swap and N20. gone. : (

Post

Fast is 10.60@134mph

My friends 1996 Grand Sort Vette

His Red 99 Vette is even faster!

Eric
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