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92 1.8 power dip
Posted: July 17th, 2007, 9:08 pm
by jeremypotter74
I seem to have a power band that goes from about 300-500 rpm. But it seems to dip in second gear right at 4000. I can feel the acceleration kick at about 3 and then it seems to hesitate at 4 and pick right back up through 5. I just bought the car and everything is stock at this point I also have a tap in the rear passenger side area of the engine probably an HLE but I can hear it inside the car at idle. Any suggestions regarding the power drop?
Thanx.
Posted: July 17th, 2007, 9:58 pm
by PATDIESEL
Sounds like a VRIS shift. We have three effective runner legnths that are changed by valves in the intake. They are controlled by vaccum and open and close to change the intake. Have someone slowly rev from idle to 5500 RPM. Then watch the two VRIS silinoids on the back of the intake to make sure both open. One opens at 4000 or about, then the other opens right at 5000, but I cannot remember the exact RPMs they shift at.
Posted: July 17th, 2007, 11:43 pm
by lakersfan1
Most people with the stock 1.8 'see' a power dip at 4,000 RPM. It's usually just the slight delay when the VRIS flaps shift followed by a power surge when the intermediate runners start flowing air.
Posted: July 18th, 2007, 12:06 am
by mx3autozam
my k8 did that too...its normal. its called a flatspot, just get a klze.
Posted: July 18th, 2007, 2:13 am
by jeremypotter74
That helps alot..... I was wondering what those vacuume solenoids were for.... I'll check that tomorrow when it wont disturb my neighbors thanx for the help....
Posted: July 18th, 2007, 9:14 am
by Sal
my k8 did that too...its normal. its called a flatspot, just get a klze.
lol....thats your solution to everything get a klze!!! " my door wont open, its ok get a klze".....funny guy!!!
Posted: July 18th, 2007, 2:18 pm
by hgallegos915
Dude.. once you go klze, you will never want to go back!!
(unless you boost and get a klde with ze heads)
Posted: July 18th, 2007, 2:45 pm
by Sal
Dude.. once you go klze, you will never want to go back!!
i know im getting mine next week...wats the advantage to getting a de with ze heads!!!
Posted: July 19th, 2007, 6:47 pm
by MoRf
boosted needs lower comp pistons, and ze heads are better then de heads
Posted: July 19th, 2007, 10:20 pm
by Nd4SpdSe
Sal wrote:lol....thats your solution to everything get a klze!!! " my door wont open, its ok get a klze"
Man speaks the truth
Posted: July 20th, 2007, 1:26 pm
by mx3autozam
Nd4SpdSe wrote:Sal wrote:lol....thats your solution to everything get a klze!!! " my door wont open, its ok get a klze"
Man speaks the truth
thanks Mike...its the truth klze all the way, you won't wanna go back. just sucks when they blow up. But thats the fun of beating the s--- out of a car at racetracks every week...lol
Posted: July 20th, 2007, 2:32 pm
by PurpleDinosaur
anyone mind if I take this ZE circle jerk back on topic?
... the flat spot... is this just to be accepted or can cleaning the linkagkes for the VRIS shutters clean it up?
I ask because just yesterday after reading this thread, my K8 developed said flat spot... for me it happens if I "sneak up on" 4000 rpm - if I am hammering it hard (WOT) and approaching 4000 it just blows right on by with no "flat"...
Normal? Not normal? Do I need to clean / adjust VRIS?
or should I just get a ZE???
:lol:
Re: 92 1.8 power dip
Posted: July 20th, 2007, 2:33 pm
by Mooneggs
jeremypotter74 wrote:I seem to have a power band that goes from about 300-500 rpm. But it seems to dip in second gear right at 4000. I can feel the acceleration kick at about 3 and then it seems to hesitate at 4 and pick right back up through 5. I just bought the car and everything is stock at this point I also have a tap in the rear passenger side area of the engine probably an HLE but I can hear it inside the car at idle. Any suggestions regarding the power drop?
Thanx.
I have been testing this the last few days and I don't have any kind of "flat spot" in my k8. It is strong from 3-6k all the way through... LOL much slower than the klze but I don't feel a lack of power based on the k8 engine...
Posted: July 20th, 2007, 7:34 pm
by lakersfan1
PurpleDinosaur wrote:anyone mind if I take this ZE circle jerk back on topic?
... the flat spot... is this just to be accepted or can cleaning the linkagkes for the VRIS shutters clean it up?
I ask because just yesterday after reading this thread, my K8 developed said flat spot... for me it happens if I "sneak up on" 4000 rpm - if I am hammering it hard (WOT) and approaching 4000 it just blows right on by with no "flat"...
Normal? Not normal? Do I need to clean / adjust VRIS?
or should I just get a ZE???
:lol:
The VRIS are set to only activate at wide-open-throttle with our factory ECU.
Posted: July 20th, 2007, 8:47 pm
by ElectricEnergy
Really? I could swear I've seen mine activate regardless of throttle position. I'll have to check again sometime.