Weird Acceleration

[arbess]

hey dudes,

over the last month or so, when i give the car some "load" especially in first and second gear, i feel a couple of weird things going on. btw r32gtr.

1: at 5.5 -6K rpm the car will sorta shudder for a moment and then keep going.

2: AWD is engaging it isnt smooth, as in i can feel the plates try and grip as hard as they can but they just let go, on and off on and off, so essentially the car is jerking very hard.

Things I have done recently:

New 5 puck button clutch. = had a old organic in there

New clutch booster and piston kit

Mods I have:

Clutch

hks air filters = one of the green filters has a big hole in it.

exhaust from dumps = small leak somewhere in the gasket near turbo

iridium spark plugs.

thats about it.

What I have thought about:

Air filter hole

also, maybe low on transmission oil.

maybe low on rear diff oil.

maybe time for new spark plugs.

ok, would be awesome help if anyone has come across this before in their gtr gtst gts4t

Edited July 5, 2007 by arbess

[typevu]

The shuddering my R33 GTS-t did it under load aswell... RAA inspection says missfiring - its either the spark plugs or coilpacks. Gotta wait til the cars out of compliance and see.

[arbess]

update.

I ran RWD to work today and found no sign of shudder, so its coming to me that my transmission/transfer box is possibly low on oil.

anymore ideas or support?

ps. in RWD mode, my car is backfiring a little more than often now when using the engine to slow down / downshifting. =) ???

Edited July 6, 2007 by arbess

[DRD-00F]

engine and gearbox cost less then your brake pads do they?

[arbess]

engine and gearbox cost less then your brake pads do they?

Not last i checked.

but to be more defined, when you accelerate in 3rd gear to "x" speed then decide to go slow down without having to go into 2nd gear, all revs under 4K, thats what i mean in my respect for engine braking.

So any other useful ideas?

[Godzilla32]

Engine braking done properly is fine providing you match revs for higher rpm use.

As for the shuddering make sure you dont actually have a missfire under load (as thats when they tend to pop up).

Either way its not hard to test your clutch and possibly the clutch packs in the transfer case for slip. Find a bit of a hill and start up it slowly in a higher gear like 4th or 5th make sure your really loading up the engine with near to full acceleration then kick the clutch and see how long it takes to re-engage. Dont release your foot off the accelerator while you do that, keep it down like your flat shifting but without the shift It should regain engagment very quickly if its all good. If not the engine will labour and it will slowly regain engagement.

Deren

Edited July 9, 2007 by Godzilla32