What could this be

[Pieceofsand]

Not sure how accurate I am on describing the problem, but I will try my best to come close to it. This is when my Z was still running btw. Say I'm on the road/street, I accelerate(5 speed) and the car goes, say 30mph. When I take my foot off the gas pedal, the car experience a "dive" motion, the weight of my body is being shift forward. The car feels like it loses power and dramatically slows down at a unusual level. It isn't as bad when it's at a higher rpm, when when I'm going fast. The strange part of this is, if i repeat that same process, but when the car start to feel like it's "diving" forward again, if I clutch, the car will roll smoothly. Been wanting to know what might be the problem and the cause of this, give me some input on this, thanks.

[Ace2cool]

dude, you know that's called engine braking, right? That's completely normal. If you don't want that to happen, just upshift or put it in neutral. How long have you been driving a manual?

[car nut]

Don't worry about it, everyone was a noob at some point.

[Pieceofsand]

lol yeah i talked to someone about it and i got my answer already. had my manual for about almost 2 years now, drove it for 8 months. hahaha. while you guys are here, wanna ask what's the difference between test pipe and down pipe

[DanDrath]

down pipes are like headers. They come off of the turbos and connect to the test pipes. Test pipes are mid pipes with no cats.

[Pieceofsand]

down pipes are like headers. They come off of the turbos and connect to the test pipes. Test pipes are mid pipes with no cats.

and for instance when someone say xxxx catback exhaust, they mean the part from the muffler to the catalytic converter?

[Ace2cool]

Catbacks leave the stock catalytic converters, and replace the stock resonators, and the stock mufflers. Test pipes replace the catalytic converters, downpipes/headers replace the stock exhaust manifold.

[Pieceofsand]

Catbacks leave the stock catalytic converters, and replace the stock resonators, and the stock mufflers. Test pipes replace the catalytic converters, downpipes/headers replace the stock exhaust manifold.

so when you get test pipe you have no catalytic converter? and does upgrading the down pipe and test pipe change the exhaust sound at all?

[NolimitZ32]

Testpipes change the sound immensely because you are removing the most restrictive part of the exhaust system. the downpipes probably don't do too much but i'm sure they make a lil bit of a difference.

[Pieceofsand]

Testpipes change the sound immensely because you are removing the most restrictive part of the exhaust system. the downpipes probably don't do too much but i'm sure they make a lil bit of a difference.

i see. yeah i'm looking forward to have this guy to rebuild my z the upcoming year, and i want to do a few upgrade, i think i might add a test pipe, are there any type/brand that you might recommend?

[Ace2cool]

Honestly, a test pipe is a piece of pipe. Nothing special. Make sure deleting the cats won't get you in trouble with emissions in your area. Not sure about how Michigan is on smog laws. As long as you're not getting a resonated test pipe, all of them will basically sound the same.

[PEZi]

this thread....

[Razi]

Pieceofsand, your car has a serious problem.Sell it to me for $500 and I'll take it off your hands.

[Pieceofsand]

Pieceofsand, your car has a serious problem.Sell it to me for $500 and I'll take it off your hands.

okay!!

[labcoatmonkey]

Not sure how accurate I am on describing the problem, but I will try my best to come close to it. This is when my Z was still running btw. Say I'm on the road/street, I accelerate(5 speed) and the car goes, say 30mph. When I take my foot off the gas pedal, the car experience a "dive" motion, the weight of my body is being shift forward. The car feels like it loses power and dramatically slows down at a unusual level. It isn't as bad when it's at a higher rpm, when when I'm going fast. The strange part of this is, if i repeat that same process, but when the car start to feel like it's "diving" forward again, if I clutch, the car will roll smoothly. Been wanting to know what might be the problem and the cause of this, give me some input on this, thanks.

If you experience jerking at low speeds probably worn engine mounts right?

[Pieceofsand]

there is nothing wrong with it. i'm just a noob lol.

Honestly, a test pipe is a piece of pipe. Nothing special. Make sure deleting the cats won't get you in trouble with emissions in your area. Not sure about how Michigan is on smog laws. As long as you're not getting a resonated test pipe, all of them will basically sound the same.

i will research about that thanks bro. is the cat delete legal in cali?

[Ace2cool]

No. Test pipes/"high flow cats" (<---basically glorified overpriced testpipes) are illegal in California ("For off road use only")

What I **MIGHT** do is get a set of testpipes with resonators so that it looks like I have cats and swap em out with stock exhaust come smog time... Haven't decided yet

[Pieceofsand]

now when you're doing the exhaust swap, or testpipe in whatever case, how complicated is the whole procedure? is it something that you'd have to go to the shop for, or it's fairly easy.

[car nut]

Everything is fairly easy if you have the right tools.

[Ace2cool]

You'll definitely want an impact wrench/compressor if you have one available. Makes life soooo much easier. Get some WD-40 or PB Blaster to spray on all the bolts, cause I guarantee that they're rusty. If you can't get ahold of an impact wrench, do the ratchet/cheater bar method (slide a piece of pipe over the ratchet handle to get more leverage.

As long as you have a proper set of tools, everything's pretty easy.

EDIT: Except headers. They're a dirty whore.

[bartZ32tt]

Just some advice piceofsand, do as much reading/research as you can. There are plenty of reliable resources already out there to refer to. Most, if not all of your questions weren't 300zx exclusive, so learn the basics first. Help yourself before asking for others' help. Otherwise, you might get flamed