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Boost / Power increase? Newbie Queston!

Ash

By Ash,
in General Automotive Discussion

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Ash Grand Master

Ash

Posted
Posted

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!

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SIKCAR Enthusiast

SIKCAR

Posted
Posted

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 :P

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?

Guest Oz Elitesport

Guest Oz Elitesport

Posted
Posted

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.

Blitz Grand Master

Blitz

Posted
Posted

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

Duncan Grand Master

Duncan

Posted
Posted

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 :)

siksII Grand Master

siksII

Posted
Posted

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 Enthusiast

GraemeWi

Posted
Posted

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 Rising Star

jvs007

Posted
Posted

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....

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