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05-31-2000, 11:15 AM | #1 |
Scooby Newbie
Member#: 1544
Join Date: May 2000
Location: Norcal
Vehicle:2012 SWP STI 5dr |
no acceleration in mid-5th??
Was trying to pass a concrete mixer truck the other day on I-5, and noticed that in 5th gear, between 3500-3800 rpm, there is literally no pull at all!! Is that normal? The engine is breathing through a Weapon-R intake, and it's screaming along at WOT. Is there a fix for the dead spot?
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05-31-2000, 01:15 PM | #2 |
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Member#: 644
Join Date: Dec 1999
Location: Hoboken, NJ, USA
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Colin,
From the flat spot he describes, without any other infor I will guess that the combo of the MAP and the Weapon R is the culprit. Even though the torque peak is supposed to be @ 4000, the torque multiplication in 4th vs 5th @3500RPM would probably put more torque to the wheels in 4th. I'm to lazy to look up ratios and do the math. If someone proves me wrong so be it. From my experience and several posts by others it seems as if intake mods can cause very unusual responses from the MAP depending on whether or not the ECU is reset, the reset technique, the weather, your cars favorite color etc, etc, etc I would first put it back to stock and see if the flatspot goes away. My car has no problem passing in that range either, other than 165hp/166lb/ft Tim |
05-31-2000, 02:44 PM | #3 |
Scooby Newbie
Member#: 1544
Join Date: May 2000
Location: Norcal
Vehicle:2012 SWP STI 5dr |
I have a MY00 RS. Funny thing is, the dead spot was noticed BEFORE I put the intake in, and also afterwards. From what I understand, the ECU did not need to be reset (since there was no MAF, only MAP, or, that's what the dealer mech told me). You'd figure with all that hideous plumbing gone, things would clear up a bit...
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05-31-2000, 03:11 PM | #4 |
Scooby Specialist
Member#: 526
Join Date: Nov 1999
Location: Beaverton, OR, USA
Vehicle:1995 Supra Turbo Red |
Momo- I've got a MY00 RS with no similar hesitation. Mine pulls pretty well in 5th throughout the RPM range. I'm thinking that what you're describing is not normal...anyone else with a MY00 care to comment? Sean |
05-31-2000, 03:46 PM | #5 |
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Join Date: Jul 1999
Location: The meeting place
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Even my 2.2l pulls ok ( I stress OK!) at that speed in 5th on a highway. But recently I filled 'er up with some cheap gas and even a tempo beats me off the line now! aarrghhh!!!
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05-31-2000, 07:56 PM | #6 |
Scooby Newbie
Member#: 1544
Join Date: May 2000
Location: Norcal
Vehicle:2012 SWP STI 5dr |
Sean,
I'm wondering if it's the gearing issue? Fourth seems to pull all the way to the redline (and then some). BTW, my MY00 RS has about 1700 miles on it. Is it okay to start playing with it?! |
05-31-2000, 08:00 PM | #7 |
Scooby Newbie
Member#: 1544
Join Date: May 2000
Location: Norcal
Vehicle:2012 SWP STI 5dr |
Sean, (again),
I hear that I should invest in a fuel meter thingy? Exactly what is this thing, and what does it do? What about AFC computer? I am so confused! |
05-31-2000, 08:02 PM | #8 |
Scooby Newbie
Member#: 1544
Join Date: May 2000
Location: Norcal
Vehicle:2012 SWP STI 5dr |
Sean, (again),
I hear that I should invest in a fuel meter thingy? Exactly what is this thing, and what does it do? What about AFC computer? I am so confused! |
05-31-2000, 11:22 PM | #9 |
over boosted again
Moderator Member#: 1458
Join Date: May 2000
Chapter/Region:
RMIC
Location: Colorado Springs CO USA
Vehicle:2017 WRX Limited 15 Forester XT, 21 Ascent |
My 2000 2.5RS NEVER had a flat spot before or after my intake mod. It pulls better in 5th gear from 80 - 120mph than ever before now.
Larry |
06-01-2000, 12:00 AM | #10 |
Scooby Specialist
Member#: 6
Join Date: Jun 1999
Location: South Jersey
Vehicle:2013 BMW M3 Coupe Interlagos Blue |
One word:
<font size="+3" color="red">forced induction</font> Ooops! That's 2 words. Either way it still applies... |
06-01-2000, 12:50 AM | #11 |
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Member#: 19
Join Date: Jun 1999
Location: Dallas, TX
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Steve, your cruel!
Although I almost posted the same thing to a post last week about getting rid of a dead spot. In all seriousness, it is true. Boost = no dead spot. I love part throttle'ing it on the highway, and absolutely flying. BTW, i used to have a dead spot without the turbo. Michael |
06-01-2000, 12:51 AM | #12 |
Scooby Newbie
Member#: 644
Join Date: Dec 1999
Location: Hoboken, NJ, USA
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Momo,
What year RS? If it is a 2000, I would take the Weapon R off and go to the stock plumbing. In my opinion the stock MAP system is THE major impediment when modifying the intake system. You are also asking the motor to do alot, to accelerate this brick of a body in 5th @ 70mph. Don't be so lazy, downshift to fourth. Tim |
06-01-2000, 12:56 AM | #13 |
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Vehicle:'03 Evo, Rice White '01 Erion CBR 929 |
Considering the torque peak of the engine (by definition, where it pulls the hardest) is at 4000rpm, I think there's a problem but I don't think downshifting is part of the answer.
As much as I like the "turbo!" answer, my stock (powertrain) '99 RS has no problem with 70-90 passing in 5th. |
06-01-2000, 04:03 AM | #14 |
Scooby Specialist
Member#: 420
Join Date: Oct 1999
Chapter/Region:
SCIC
Location: The LBC, CA, USA
Vehicle:2001 Cr-V Silver |
I have mine dialed-in w/ AFC/ITC mojo, and good gas - pretty good pull in 5th.
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06-01-2000, 06:32 AM | #15 |
Scooby Newbie
Member#: 644
Join Date: Dec 1999
Location: Hoboken, NJ, USA
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Momo,
Try a reset, With the engine cold, disconnect the battery for over an hour (overnight if you can). Reconnect battery, keep keys handy to stop the alarm. Make sure everything is off. Put key in the ignition, turn to accesory position so that the fuel pump will pressurize the sytem (3secs). Without touching the gas start the car and let it idle. Don't touch anything but watch the temp guage. When the car reaches operating temp and the fan cycles on, shut the car off without touching anything but the key. Restart car and drive it like you stole it. Be sure of the quality of the gas you are using when doing this proceedure. A bottle of octane boost may help if you are in doubt about what is in the tank. I have a 2000, I experienced a similar flatspot after intake mods, and once after an improper reset (the AC was on, oops!). The car runs strong now everywhere after a proper reset. If there is still a probem, visit your dealer. Tim |
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