BLACK BEAST BUILD Slicktop R-Spec

Can the stock 200sx (S13) T25 turbos be used as a budget replacement/upgrade for the 300? Could this turbo fit, has anyone done this before successfully? The exhaust wheel looks a lot larger and I see it is a 5 bolt type, so maybe a bit laggy.
Cheers

 

looks great, im doing a similar TT conversion on my NA, not sure if I am just gonna use the NA bottom end or replace that also yet.

Peace

 

Its been a long time since ive posted on here but this is very interesting, i like it how you have got to the bottom of things and work your way up (commenting mainly on the length you have gone to get your suspension setup and brakes....definatly have my eyes on ur, robs and brads aka DUBs 300zx....all very nicely executed cars...

 

Just curious having seen the number plate, did this car used to be red with red seats?

 

Impressive performance, wish I had known about those BDE VCT gears when my engine was built, I went JUN adjustables too. So in your experience its clear that the VCT is worth it I assume.

 

no

 

absolutely .. VVT is a must on the VG...

 

looking good man

looking forward to some vids

 

Sorry but which year models have and do not have VVT??

 

All have it except for '96+ US zeds.

Some people remove it when installing larger cams as they often flog out the VVT gears.

 

Thanks chrispy, wasn't sure if my TT had it. Thought i read somewhere its was 93+.

P.s. just noticed the fluffy toy in your sig...hope its photoshopped.

 

Haha, no, that is real

It was on the car when I got it. He is now living in my tool box

 

On a road car yes definitely, on a pure track car NO

 

Please explain Tekky

Incidentially mine has a set of standard lift Tomei Poncams.

 

I cant see the problem with running it on a track car?

you are throwing away quicker spool and torque without it..fatter powerband
curious on your reasons...

 

From what I've read recently the extra lift puts a lot of strain on them and they wear out quicker and clack around.

 

Its actually the stronger valve springs that make them rattle
thats why I have the BDE ones . . quiet as a mouse

 

The poiint of having VVT is to change the cam timing in the band where the overlap isnt optimum for the engine speed used.

On a road car you use the full gamut of engine speeds from idle to 7000 revs. Fixed cam settings can only be optimum for a small cam speed range say 1500-4000 revs. So for road use VVT is essential.

It means optimum overlap at most engine speeds using the VVT to move the cam timing as required to maximize power and torque.

On a track car you really should be on boost and a couple of thousand revs either side of the peak torque area of 4500-5000 revs over 90% of the time.

Usuable engine speed range is 3750-7000 revs. To stray outside that compromises power as you are off boost and the torque peak of the engine.

As the engine doesnt have to deliver power outside that range low end rev torque/power isnt an issue.

You can very effectively set fixed gears to have perfect overlap between those speed ranges 3750-7000 revs without the complexity and potential failure of VVT at high engine speeds with high lift cams.

The end result is Yes you can use VVT on a race car but the extra complexity and possibility of failure as well as expense doesnt warrant it's inclusion as it has little or no benefit on a race car.

I have Tomei fixed inlet gears for the race car and they will be used as will the exhaust gears.

 

understand what you are saying in theory but having experienced both practically I would still use VCT


my VCT shuts off at 5700. alot later than most .

JP also said its better with it .. main reason for him not having it would of been weight reduction 4 exhaust cams and 4 cam gears.

but everyone has different ideas of setups and if it works for your application ..thats great.

 

Well, If we had real VVT, VVT that actually changes and adjusts cam timing continually as the revs rise (like Vtec) I would agree.

But we only have a 2 step version. This means that there is a correct cam position for lower rev range and one for upper. Therefore if we are using just the mid/upper range, correctly set fixed gears are no disadvantage.

But as we have agreed, on the road, VG30 VVT is really required. It is a dog at low revs without it.