Jump to content
SAU Community

Recommended Posts

Originally posted by adam 32

micko good call :(  

rob enough is enough. if you think you can run a 13 then go do it. dont drag is through every mundane detial in a hope to get into some petty argument about running a 13second pass with 180rwhp

Ok , I think we can leave the arguments aside now and perhaps look at the more productive and interesting questions like :

How to run a 13 with less than 200rwhp.

And

How to get a quicker launch and 60ft time in your skyline on race day.

:(

  • Replies 58
  • Created
  • Last Reply

Top Posters In This Topic

Originally posted by adam 32

one question i want to ask is does a burnout help when your tryin to launch on street tyres (say theyve been let down to 20-25psi) ??

Yes it can help but not if you keep melting the tyres in a brake burnout demo. Lots of street compounds get 'slippery' after being melted like that, also as you heat up the tyre the air expands inside and exerts more pressure

The trick is to let it rip without applying the brake and keep the shtick up until it starts to bite then back off. With mine I start axle hopping.

20psi is good on most tyres, 18psi is better but, if you do burnouts on them and launch frequently, the poor old side walls will never be the same again, they might even 'egg' on you one day. Most street use tyres don't have intentional sidewall flex built into their design.

Originally posted by adam 32

so u reckon just a 5000rpm clutch dump in the water?

If that is what it takes to launch well for you I'd say why not. In my case 3500rpm a throttle fed clutch dump is what I used (when my clutch felt like it). If you can replicate the launch technique all the better. I guess you don't want to back off because it's spinning too much but rather because you got traction and are heading towards the end of the staging lane line.

What I mean by 'throttle fed' is not mashed straight flat to the floor but a quick smooth action. Mashing the throttle will get your wheelspin but you get traction only because you back off, you will have no idea if the tyres are warm enough or too warm until you hit real thing and find out the hard way.

Ok ok my turn i couldnt wait till the end of this post so i could talk haha

Rob You sound as if u are doint the right things its just a matter of time altho i personally think that anything under 13.9 is just silly, because u dont have the top speed yet!

And dont run 1 bar

I personally have a suspension problem at the drags and cant better 2.5 60ft time apart from the fact i usually blow something up! :)

Rev210 Ben is right with the intercooler being just as much a problem as the turbo. Do you think at 1bar there is no drop in pressure over that tiny intercooler? Apparently 6psi with 15@plenum chamber. Thats a nice 21 psi thank you very much quoted in and old zoom mag issue. Thats busting your turbos ass...put a FMIC on and pressure drop is less..

Dont worry about adam32 hes just jealous that he cant get in the 13s either :lol: :lol:

Originally posted by macka

Rev210 Ben is right with the intercooler being just as much a problem as the turbo. Do you think at 1bar there is no drop in pressure over that tiny intercooler? Apparently 6psi with 15@plenum chamber. Thats a nice 21 psi thank you very much quoted in and old zoom mag issue. Thats busting your turbos ass...put a FMIC on and pressure drop is less..

Does that mean with a nice flowing intercooler you can run 16psi at the plenum without a care, assuming a 1 psi pressure drop at the cooler?

A plenum 12psi on the stock cooler would be about 18psi at the turbo I'm assuming. Making the stock wheel able to handle an 18psi load safely but not higher.

If you want to run 17 psi thru your ceramic turbine wheel you can yes

I wouldnt recomend it!

Pressure drop over your standard cooler is pretty much logarithmic

Its designed to flow 6.8psi (say 1psi drop)

12psi it may have only a couple of psi drop.

The cfm (flow) of the turbo @15psi or thereabouts is like trying to squeeze a 1Jz Supra engine into a corolla

Im not speaking out of my ass I know guys who have run 12 to 15 psi and they are lucky to some point but then again DRIFTR33 Blew his turbine at a mere 9psi and wassabi hehe he just cranked her up till she rattled

Do your cooler first and you can make your turbo last longer@12psi i wished now that i had done that mine blew at 13.5psi but not only did it blow it tore the shaft off turbine went out exhaust and compressor wheel went into cooler ie engine (Bang)

Originally posted by macka

If you want to run 17 psi thru your ceramic turbine wheel you can yes

I wouldnt recomend it!

Pressure drop over your standard cooler is pretty much logarithmic

Its designed to flow 6.8psi (say 1psi drop)

12psi it may  have only a couple of psi drop.

The cfm (flow) of the turbo @15psi or thereabouts is like trying to squeeze a 1Jz Supra engine into a corolla

Im not speaking out of my ass I know guys who have run 12 to 15 psi and they are lucky to some point but then again DRIFTR33 Blew his turbine at a mere 9psi and wassabi hehe he just cranked her up till she rattled

Do your cooler first and you can make your turbo last longer@12psi i wished now that i had done that mine blew at 13.5psi but not only did it blow it tore the shaft off turbine went out exhaust and compressor wheel went into cooler ie engine (Bang)

I know what you are talking about with the stock turbo's love for blowing up at higher boost. It's interesting to consider the pressure at the turbine as opposed to the plenum.

I don't think I'd buy an aftermarket intercooler first myself (call me weird). I would go change the turbo, the intercooler change doesnt add power with the stock turbo running 10psi. And with the stockie ready to let go at greater boost pressure, the new ic would just add the temptation to do naughty boost increases.

Its six of one and half a dozen of another all the same.

Originally posted by rev210

I don't think I'd buy an aftermarket intercooler first myself (call me weird). I would go change the turbo, the intercooler change doesnt add power with the stock turbo running 10psi.

Your wierd :) If all you want is a drag queen, then I guess going for a turbo first *might* be ok. But from all reports, a decent intercooler gives far greater throttle response (even with extra piping) on stock or near stock boost.

I understand what your saying about keeping the turbo alive. All you need to do is practice a bit of self control. Set it to 12psi (more than safe with a 'cooler) and leave it there :)

Dave

If you're interested I could help you get a cheap home made cooler from a guy I know and trust.

It wouldn't be a thing of beauty but hey it would work.

He'll be making some soon but not right now.

Cheers

Chris

Originally posted by rev210

I know what you are talking about with the stock turbo's love for blowing up at higher boost. It's interesting to consider the pressure at the turbine as opposed to the plenum.  

I don't think I'd buy an aftermarket intercooler first myself (call me weird). I would go change the turbo, the intercooler change doesnt add power with the stock turbo running 10psi. And with the stockie ready to let go at greater boost pressure, the new ic would just add the temptation to do naughty boost increases.

Its six of one and half a dozen of another all the same.

Oh yeah i forgot you run a refrigerated intercooler I guess you wouldnt need to change it then :lol: :shake:

Originally posted by R34

Dave

If you're interested I could help you get a cheap home made cooler from a guy I know and trust.

It wouldn't be a thing of beauty but hey it would work.

He'll be making some soon but not right now.

Cheers

Chris

Sounds groovy. Keep us informed buddy.:D

Originally posted by macka

Oh yeah i forgot you run a refrigerated intercooler I guess you wouldnt need to change it then :lol: :shake:

The 'westinghouse' is not any real use when the boost is on, its more for a quick cool down before you plant it again. Or for a temp drop when driving along normally (off boost) for extra response and fuel ecconomy perhaps.

At least the front mount looks better than my ugly looking stockie with wires hanging off, normally its hidden but I have long since removed the inner left wheel dust guard to allow better airflow a tip worth considering if you are stuck with the stock cooler.

Originally posted by adam 32

your not that guy whos mate apparently ran a 12.6 in a zed with filter, exhaust and boost are ya? ive already argued that one to death

i swear your drag strips must run downhill

Well Said Adam,

Sorry mate but i have seen quarter mile times released from Nissan Itself talking in the vacinities of low 14 sec for the stock 300zx.

This aint the realease from Nissan itself but the quarter mile times on the site are quite accurate. PLease select link then go to specs: www.envyimports.com.au

From this list which does seem to be quite accurate S15 standard seems to do 13.8 quarter mile. However if you are the guy that was telling everyone that 300zx's do 12.6 standard well you might want to stop using the APEX RSM while somehow driving down mount Koziosco! (spelling? but you get the idea!)

go the cooler

ive noticed no side affects as some said the big cooler would cause.

my car ran its fastest time on weds with more wheel spin than before.

talk to mr mayhem bout coolers and availablity.

why dont you look into a VL turbo conversion for your standard ones

they are a plain bearing type but no ceramic ex wheel.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Latest Posts

    • Did this end up working? Did you take some pictures?
    • And finally, the front lower mount. It was doubly weird. Firstly, the lower mount is held in with a bracket that has 3 bolts (it also acts as the steering lock stop), and then a nut on the shock lower mount itself. So, remove the 3x 14mm head bolts , then the 17mm nut that holds the shock in. From there, you can't actually remove the shock from the lower mount bolt (took me a while to work that out....) Sadly I don't have a pic of the other side, but the swaybar mounts to the same bolt that holds the shock in. You need to push that swaybar mount/bolt back so the shock can be pulled out past the lower control arm.  In this pic you can see the bolt partly pushed back, but it had to go further than that to release the shock. Once the shock is out, putting the new one in is "reverse of disassembly". Put the top of the shock through at least one hole and put a nut on loosely to hold it in place. Put the lower end in place and push the swaybar mount / shock bolt back in place, then loosely attach the other 2 top nuts. Bolt the bracket back in place with the 14mm head bolts and finally put the nut onto the lower bolt. Done....you have new suspension on your v37!
    • And now to the front.  No pics of the 3 nuts holding the front struts on, they are easy to spot. Undo 2 and leave the closest one on loosely. Underneath we have to deal with the wiring again, but this time its worse because the plug is behind the guard liner. You'll have to decide how much of the guard liner to remove, I undid the lower liner's top, inside and lower clips, but didn't pull it full off the guard. Same issue undoing the plug as at the rear, you need to firmly push the release clip from below while equally firmly gripping the plug body and pulling it out of  the socket. I used my fancy electrical disconnect pliers to get in there There is also one clip for the wiring, unlike at the rear I could not get behind it so just had to lever it up and out.....not in great condition to re-use in future.
    • Onto the rear lower shock mount. It's worth starting with a decent degrease to remove 10+ years of road grime, and perhaps also spray a penetrating oil on the shock lower nut. Don't forget to include the shock wiring and plug in the clean.... Deal with the wiring first; you need to release 2 clips where the wiring goes into the bracket (use long nose pliers behind the bracket to compress the clip so you can reuse it), and the rubber mount slides out, then release the plug.  I found it very hard to unplug, from underneath you can compress the tab with a screwdriver or similar, and gently but firmly pull the plug out of the socket (regular pliers may help but don't put too much pressure on the plastic. The lower mount is straightforward, 17mm nut and you can pull the shock out. As I wasn't putting a standard shock back in, I gave the car side wiring socket a generous gob of dialectric grease to keep crap out in the future. Putting the new shock in is straightforward, feed it into at least 1 of the bolt holes at the top and reach around to put a nut on it to hold it up. Then put on the other 2 top nuts loosely and put the shock onto the lower mounting bolt (you may need to lift the hub a little if the new shock is shorter). Tighten the lower nut and 3 upper nuts and you are done. In my case the BC Racing shocks came assembled for the fronts, but the rears needed to re-use the factory strut tops. For that you need spring compressors to take the pressure off the top nut (they are compressed enough when the spring can move between the top and bottom spring seats. Then a 17mm ring spanner to undo the nut while using an 8mm open spanner to stop the shaft turning (or, if you are really lucky you might get it off with a rattle gun).
    • You will now be able to lift the parcel shelf trim enough to get to the shock cover bolts; if you need to full remove the parcel shelf trim for some reason you also remove the escutcheons around the rear seat release and you will have to unplug the high stop light wiring from the boot. Next up is removal of the bracket; 6 nuts and a bolt Good news, you've finally got to the strut top! Remove the dust cover and the 3 shock mount nuts (perhaps leave 1 on lightly for now....) Same on the other side, but easier now you've done it all before
×
×
  • Create New...