Boost / Power increase? Newbie Queston!

[Ash]

i have a coupple of questions about my new R33GTS-T.

1. at how many revs does the car come on boost?

2. When the boost kicks on, how much extra power does it add?

The reason i ask this is i was driving up falcon street in crows nest doing less than 40, (i was in second gear) then i floored it, the revs went up pretty quickly but when the turbo kicked in it threw me back in the seat and the car stepped sideways (thank god no one was next to me) [it was nothing major just like what you see when some people launch at the lights! i don't even think i left my lane ]. i am new to turbo cars so i have to learn to drive them, but is that normal, such a big power increase to break traction at about 50Ks an hr??

or would the previous owner have done some tweaking? i didn't look at the boost gage on the dash, but once before when i was on boost the needle was off the clock! should i get this checked?

3. When i start of in first gear (in the wet) i don't get wheel spin, but as soon as i go over about 2500 revs the wheels start to skid, is this normal? or perhaps i just need to learn to drive better?

4. If i should get new tyres for the rear which ones? at the moment it has 225/50/16 dunlop fm901's.

Thanks!

[SIKCAR]

sounds like you've got some kinda monster turbo on

but on stock, when the boost kicks in, you should feel a pull back, not sure about that extreme lost of control lol

[Ash]

i imagine it would be the stock turbo or the previous owner would have used that as a selling point, hmmm... what does the standard one look like?

[SIKCAR]

you shouldn't be able to see it looking from the top as it's bottom mount

but even if it's aftermarket turbo, if it isn't too big, it would be hard to tell by looking at in, you'd have to take it out and see

but who would complain with a bigger turbo

and when you say "but once before when i was on boost the needle was off the clock! should i get this checked?" what boost gauge was this?

[Ash]

the one on the dash

[GraemeWi]

Off the clock on the dashboard boost gauge = more than 1 bar...lets hope the previous owner did some ECU work as well!

Until you know for sure what the car has in the way of modifications, try to keep the boost <12 psi (about 3/4 on the factory gauge)

G

[Ash]

ok

[Guest Oz Elitesport]

On my factory boost gauge, the needle goes up to just below the half way mark. I cant notice much kick back anymore, but a mate who went for a drive with me says it does push you back into the seat. I've never had it step sideways doing 50km/hr.

Sounds likr the previous owner has done some tweaking.

oz.

[GILTY]

is this a joke?

You can't be serious!

Please do not drive anywhere near me.

[Blitz]

A5h: you have alot to learn mate. I would be booking yourself in at an advanced driver training course asap.

Putting your car sideways in the middle of a street because you dont know how the car behaves is not a good thing.

Boost on your car being a stock turbo will come in early, from memory on my old car anywhere from 2500rpm - 3000rpm.

Chances are although you claim to have being doing 40, the revs were at a high enough level that boost was instant.

I dont recommend you plant your foot on the gas especially if its wet.

Considering you are relatively inexperienced driving a turbo car i suggest you have the boost checked and have it returned to stock if it isnt already. There is no need for you to be running higher boost until you can handle the cars factory power.

If you have FM901's on the back at least ,you have some very good tyres there, stick with them

[MM2death]

Originally posted by GILTY

is this a joke?

You can't be serious!

Please do not drive anywhere near me.

lol, i'll second that.

[Ash]

it was nothing major just like what you see when some people launch at the lights! i don't even think i left my lane

[DKS1DR]

Originally posted by a5h

it was nothing major just like what you see when some people launch at the lights! i don't even think i left my lane

Well, there ya go. That makes it all better.

[Duncan]

If your boost is off the guage, it is over 14psi, general consensus is that anything over 10psi can kill stock turbo. I'd suggest you have a good mechanic look at the turbo and ECU to make sure you're not in for some expensive bills.

Also, as Blitz said, get along to some advanced driver training, its the best mod you'll ever make

[Ash]

one of my friends says that his car when he hammers it it jumps over 1bar for a coupple of seconds then drops back down to about 13psi, if it was doing that would it be ok?

[EnricoPalazzo]

No

[Ash]

hmmm... ok then, well i have had the turbo timer re-connected

ill go out in a controled environment and have a passanger monitor my boost while i launch through 1st and 2nd a coupple of times?

[siksII]

Isn't one bar 14.something psi? The boost gauge on my series 2 goes from -7 to +7psi, comes on boost around 2800rpm with 4.5psi and then goes up to the max(7psi) from 4500rpm onwards... Are all you guys saying that the stock boost is one bar(14psi)?????????

[GraemeWi]

The +7 on the factory gauge is 700mm/hg - this is not PSI.

+7 is equal to 13.53 psi or 0.93 bar...it's a very unusual unit of measure Nissan have used, it's more normally found in engineering.

Stock boost on a R33 is usually between 5-8 psi (depending on a few things!)

Cheers,

G

[jvs007]

i dont know if this is a possibility but could the waste gate be not working right which results in overboosting??? could this be the reason for the sudden power increase to cause wheel spin in 2nd.

if it is overboosting then won't it also cause the needle to go off scale???

sum1 correct me if i'm wrong....