92 1.8 power dip

jeremypotter74 · Post by **jeremypotter74** » July 17th, 2007, 9:08 pm

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.

PATDIESEL · Post by **PATDIESEL** » July 17th, 2007, 9:58 pm

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.

lakersfan1 · Post by **lakersfan1** » July 17th, 2007, 11:43 pm

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.

mx3autozam · Post by **mx3autozam** » July 18th, 2007, 12:06 am

my k8 did that too...its normal. its called a flatspot, just get a klze.

jeremypotter74 · Post by **jeremypotter74** » July 18th, 2007, 2:13 am

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....

Sal · Post by **Sal** » July 18th, 2007, 9:14 am

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!!!

hgallegos915 · Post by **hgallegos915** » July 18th, 2007, 2:18 pm

Dude.. once you go klze, you will never want to go back!!

(unless you boost and get a klde with ze heads)

Sal · Post by **Sal** » July 18th, 2007, 2:45 pm

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!!!

MoRf · Post by **MoRf** » July 19th, 2007, 6:47 pm

boosted needs lower comp pistons, and ze heads are better then de heads

Nd4SpdSe · Post by **Nd4SpdSe** » July 19th, 2007, 10:20 pm

Sal wrote:lol....thats your solution to everything get a klze!!! " my door wont open, its ok get a klze"

Man speaks the truth

mx3autozam · Post by **mx3autozam** » July 20th, 2007, 1:26 pm

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

PurpleDinosaur · Post by **PurpleDinosaur** » July 20th, 2007, 2:32 pm

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:

Post by **Mooneggs** » July 20th, 2007, 2:33 pm

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...

lakersfan1 · Post by **lakersfan1** » July 20th, 2007, 7:34 pm

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.

ElectricEnergy · Post by **ElectricEnergy** » July 20th, 2007, 8:47 pm

Really? I could swear I've seen mine activate regardless of throttle position. I'll have to check again sometime.

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92 1.8 power dip

92 1.8 power dip

Re: 92 1.8 power dip