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Old 03-01-2001, 07:57 PM   #1
yebokmj
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Post Turbo and Gas pedal relationship?

I just put in my JC Sports turbo and am having some problems. One is that it always seems to be building boost if I am even shallow onthe Gas pedal. I was under the impression that you had to get pretty deep in the pedal for a turbo to boost. And yes this is in all gears. Is this normal?
Joshua
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Old 03-01-2001, 08:01 PM   #2
HondaH8er
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I think that as long as you push on the gas, the turbo will be spooling. Won't build a lot of boost, of course, but it is still spooling. Am I wrong? I've never driven a turbo car before, so I'm just speculating.
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Old 03-01-2001, 08:11 PM   #3
tom@kartboy
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Josh
this is normal for small turbo's
that is why there is NO lag on them
on the one ihave yo have to get a littel more into the throttle to get boost, but then it REALY gets going at 6 pounds and running FAST
tom@kartboy.com
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Old 03-01-2001, 08:13 PM   #4
RidinLow
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Yep, small turbos spin up really quickly but they also won't be able to flow as much air as a bigger one. A larger turbo will take a bit longer to spool up, but once it gets going, hold on!
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Old 03-01-2001, 08:14 PM   #5
mrbell
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really, depending on the turbo, the boost isn't much related to the pedal. Yes, the farther you press on the gas, the more exhaust you make which spins the turbo, but after a certain RPM(jc sports uses a relatively small IHI or a garret t28(?) which is small too), the turbo is spinning anyway simply because the flow of exhaust. I think those turbos give full boost around 3.5k, so it's gotta start boosting early...
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Old 03-01-2001, 08:52 PM   #6
mcgyver
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Question

Joshua,

Otherwise, how is the kit working out?

I too have a MY98, so I'm curious about fitment and performance. Are you running any electronics or guages? Any info is appreciated, Thanks

Adam
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Old 03-01-2001, 09:11 PM   #7
yebokmj
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Post

The kit is running kind of crappy since JC Sports sent me the wrong turbo inlet for my year MY98. Becaue of that all my vacume hoses are kid of micky moused. I was suposed to be running a Torque Chip II for my turbo and that's all. But They sent me the wrong one for my year as well so when I hooked up it blew my ecu fuse. So all I am running is the ECU. But they are sending me out the right chip along with turbo inlet so that should settle things down. Check in with me beging of next week and all should be well. And I can give you a more accurte discription. Oh did I mention it's fast? Will a boost controler help make it so the boost will not come on till deeper in the throttle?
Joshua
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Old 03-01-2001, 09:17 PM   #8
GTBGUY
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Well, a boost controller only makes sure you're making the boost (the pre-set level of say 5psi). Some boost controllers are RPM dependant, since the EJ25 is a relatively torquey engine, and the DOHC really shines in the upper end, it's good to have the turbo spooling so fast (hence no low end loss, and a very "transparent" linear torque curve). This actually I find increase drivablity.
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Old 03-02-2001, 05:11 AM   #9
yebokmj
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My problem is that even trying to crusie at an even speed like on the highway it seems to boost. Anyone else have this?
Joshua
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Old 03-02-2001, 06:03 AM   #10
JGard
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Josh, turbo's will be boosting while on the highway...

that's why you saw in the 80's ton's of people blowing their turbo's because they'd run on the highway (cruising), but still never let the turbo cool down before killing the engine. that turbo's a-kickin
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Old 03-02-2001, 06:44 AM   #11
Memnoch
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Let me see, turbo spooling all the time. Hmm. Ok what's your problem you said?

Really, that's the cool part of that small turbo. You always have that turbo power there, you don't have to flog your car or anything. It's there when you need it.
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Old 03-02-2001, 06:59 AM   #12
efoo
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that's not a problem. it's a feature of a small turbo. you should be happy with that if anything.

mickey mousing with your turbo piping and your engine management electronics (you blew a fuse on your ECU?!?) is a very bad no-no, by the way. a leak in the wrong place may well cause you to catastrophically overboost and blow up the engine. i would have waited until getting all the right pieces before even putting the kit on the car, but that's me.

-Edwin
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Old 03-02-2001, 07:10 AM   #13
bratmantlz
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Question

hey josh you have any pics of your engine bay. i have a 98 too and might go jc turbo someday if i ever get my sportbike sold oh turnsignals are still great
Brian
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Old 03-02-2001, 07:58 AM   #14
yebokmj
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Post

Well I drove it more today and it seems to be just perfect now. If I keep it at cruise its normal, but if I dip into the accelerator at all it starts to really boost. This is all with a stock ECU and an uprated fuel pump that's all. I know I I really at the ragged edge. But the Torque Chip will handle all that when I get it. I also have a fuel pressure riser that I need to install. Any one have directions on how to do it? Oh and no pictures yet, but I will get some eventually.
Joshua
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and Extreme turbo novice
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Old 03-03-2001, 12:33 AM   #15
ImprezaRS dot com
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Post

Hmmm.

I have the small IHI kit on a MY00, and cruising down the highway at 75mph under 15% throttle it is running -15 to -20 vacuum. I can give it more throttle, like 30% and get 0 pounds boost (atmospheric) while accelerating. I get 5 psi at maybe 50% throttle or more with good acceleration. WOT and it creeps to 7 psi and goes like gangbusters.

A few other tidbits about the IHI kit. If I drop to 2000 rpm in 4th gear at about 32mph and nail it, I build 7 psi by 2,300 rpm.

In 1st - 3rd there is zero lag. And there is very little lag in 4th and 5th- at over 3,000 rpm in any gear, I get full boost in 0.5 - 1.0 second.

Don't know why you have boost all the time...

Larry www.ImprezaRS.com
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