Lagging issues

clean2g · 07-13-2006

I'm having some annoying lagging issues and also a mushy clutch pedal that lasts for the first 10 minutes that I drive. I have changed everything humanly possible that I can think of: Clutch master and slave cylinders, SS clutch line, transmission was rebuilt 8,000 miles ago and new clutch was put in 20,000 miles ago. The lagging is not consistent; some days it's there some days it's not. I can't figure out if the clutch is slipping or if there's a boost leak. Right before spool up there will be an obvious lag/bog and then the turbo starts spooling. The car is a 97 GSX with 108,XXX miles. Mods are: Shep stage 1 rebuilt trans, ACT 2600 clutch w/resurfaced flywheel, mbc, catback exhaust, bov, intake, hahn sidemount ic upgrade, and ic hardpipes. Any advice/input greatly appreciated.

s1ngletracker · 07-13-2006

7 bolt? You may laugh at me, but check for crankwalk. I had tons of clutch issues, and my car was walked bad.

clean2g · 07-13-2006

Quote:

Originally Posted by s1ngletracker

7 bolt? You may laugh at me, but check for crankwalk. I had tons of clutch issues, and my car was walked bad.

Do you recommend a place/someone for checking for crankwalk? I know there's a vfaq but I'm afraid I'll jack something.

xveganxcowboyx · 07-13-2006

The problems could be seperate. What does your fuel system look like? Have you logged anything?

Turbocharged · 07-14-2006

Quote:

Originally Posted by clean2g

Do you recommend a place/someone for checking for crankwalk? I know there's a vfaq but I'm afraid I'll jack something.

Just drop the oil pan an measure the thrust bearing clearance.

Was your clutch hydraulic system properly bled and adjusted?

As for your lag issue, check for exhaust leaks before the turbo.

Turbocharged · 07-14-2006

Quote:

Originally Posted by xveganxcowboyx

The problems could be seperate. What does your fuel system look like? Have you logged anything?

I agree, the problems sound separately related.

**JET** · 07-14-2006

Quote:

Originally Posted by Turbocharged

I agree, the problems sound separately related.

The english language kicks ass

Just measure the play on the crank pulley to see about crank walk. You will need a depth mic, dial indicator or a caliper to take the measurement. Pull the pulley out, take a measurement, then push it in and take a measurement. The difference is the amount of thrust bearing play that you have.

s1ngletracker · 07-14-2006

^^^ do what Jet says.

Turbocharged · 07-14-2006

Quote:

Originally Posted by JET

The english language kicks ass

HAHA, I wrote that in a hurry. I guess it would have made more sense to say that the problems were unrelated instead of "separately related"... its too early.

JET's right. I guess I like doing things the hard way.

Do the rpm's drop when the cluth is depressed? Do you here a ticking when you depress the clutch and hold it to the flood? Have you ever had a problem with the clutch pedal sticking to the floor when you make a left hand turn (the pedal will stop a few inches short)?

Turbocharged · 07-14-2006

Sorry, double post.

s1ngletracker · 07-14-2006

Quote:

Originally Posted by Turbocharged

HAHA, I wrote that in a hurry. I guess it would have made more sense to say that the problems were unrelated instead of "separately related"... its too early.

JET's right. I guess I like doing things the hard way.

Do the rpm's drop when the cluth is depressed? Do you here a ticking when you depress the clutch and hold it to the flood? Have you ever had a problem with the clutch pedal sticking to the floor when you make a left hand turn (the pedal will stop a few inches short)?

in addition to this, do you ever have clutch chatter? do you ever have inconsistant clutch engagement height? those are symtoms i had.

clean2g · 07-14-2006

Quote:

Originally Posted by Turbocharged

HAHA, I wrote that in a hurry. I guess it would have made more sense to say that the problems were unrelated instead of "separately related"... its too early.

JET's right. I guess I like doing things the hard way.

Do the rpm's drop when the cluth is depressed? Do you here a ticking when you depress the clutch and hold it to the flood? Have you ever had a problem with the clutch pedal sticking to the floor when you make a left hand turn (the pedal will stop a few inches short)?

I have lifter tick but that's there no matter what. Pedal never stuck to the floor on a left hand turn.

clean2g · 07-14-2006

Quote:

Originally Posted by JET

The english language kicks ass

Just measure the play on the crank pulley to see about crank walk. You will need a depth mic, dial indicator or a caliper to take the measurement. Pull the pulley out, take a measurement, then push it in and take a measurement. The difference is the amount of thrust bearing play that you have.

What is an "acceptable" amount of play, and what is not?

**JET** · 07-14-2006

Over .010" is out of spec. Over .025" and you had better call Houston, because you have a problem.

clean2g · 07-14-2006

Quote:

Originally Posted by JET

Over .010" is out of spec. Over .025" and you had better call Houston, because you have a problem.

lol, alright thanks, I'll take a look at it.