Bang for buck mods

[Fuel]

Changing the exhaust/dump pipe will have an effect on boost control.

[SpidersWeb]

correct me if im wrong but 7-8psi of boost should be the standard stock boost level regardless of the turbo, as far as im aware the aus delivered and jap delivered cars (JA, B and D) all ran 7-8 pounds of boost?

Sounds like some sort of overboosting there?

Yeah 7-8, but its easily possible for the occasional car to vary. Starions can be fairly random in their specs, and there is no telling what somebody did when the car was new too - could of had a wastegate actuator upgrade, or the pole length adjusted, a larger exhaust can also increase boost, its near impossible to pin an accurate statistic on cars of this age.

But on average, yes, 7-8psi for all models.

[TD05]

I agree, 7-8 psi used to be the max boost level, until the std x-over pipe was ditched in favour of a larger diameter pipe, no other changes were made, so
I guess the stock x-over pipe was fairly restrictive, barely 1in dia at the turbo.. the car has been running like this for a while now, I'm using BP ultimate and I've noticed no pinging at all...

[JD_Stazza_Brendan]

I have a JD Starion and i have a bleed valve(which now runs at about .65 to .7bar) and a 3inch exhaust from about 1 foot before the diff to the rear (going to be full 3inch from turbo soon).

I want to upgrade filters but keep the orignal aircan setup as it has cold air induction from the gaurd.

Anyone know what sort of power i have at the wheels now??
And once i have air-filter and the rest of the exhaust?

[fr335tyl3r]

I am not sure what the standard power values of the JD are, but I would think with the boost increase, maybe 20hp extra at the fly. The current modification to the exhaust will probably be unlikely to give you any gain as it is still greatly restricted in the dump and first meter or so that is not 3"

With the full 3" and air filter, maybe a 40-50hp gain at the fly all together?

Its hard to say unless you throw the thing on the dyno as the condition of the engine and the air it is breathing will change the power figures quite a bit.

[JD_Stazza_Brendan]

Even though i replaced only a small part of the exhaust, I still felt the difference. I would have gotten full 3inch straight away but i couldnt afford it and needed the back part of the system replaced for RWC

[fr335tyl3r]

Nah understandable mate. You may feel a slight gain in the top end (which is where the main benefit from a 3" is going to be) due to the slightly reduced restriction, but it will be a much larger difference when you get the whole thing changed over.

[JD_Stazza_Brendan]

Nah understandable mate. You may feel a slight gain in the top end (which is where the main benefit from a 3" is going to be) due to the slightly reduced restriction, but it will be a much larger difference when you get the whole thing changed over.

Im waiting for that day when the whole thing is 3inch.
In the manual i have it states the JD's power is 110kW @ 5000 or 5500rpm. I dont want to modify mine to far ( as in full rebuild with MPI and such) as its rare.

Has alot more go then my 1980 2L auto Sigma.

[fr335tyl3r]

I would expect if the motor is in perfect condition and the air being taken into the engine is cold. Possibly an increase to 140kw @ the flywheel with the boost increase and exhaust modifications.

Again, only a guess as the only way you will find out is to do the mods and then take it for a power run on a dyno.

[DD Phil]

On my old yellow JA I did:

TO3 from an FJ 20 $300 I welded an adaptor onto a new stock manifold.
Pulsar GTir intercooler $500 plumbed myself in 2 and 2.5"
3" exhaust $450

With stock computer it made 197HP at the wheels on around 10-12psi. The turbine housing has too small (AR 0.48) so running any more boost resulted in the boost spiralling out of control above 5000rpm. A 0.63 from a VG30 or RB30 would be the go. Stay away from the ceramic wheel/shaft Nissan TO3s.

The TO3 boosted so much harder and faster than the Mitsi turbos I'd used before, with full boost at around 2800rpm.

My yellow JA used to be neck and neck with a freinds 14 flat Starlet, it was so fun to drive, I put in an LSD and it was a donut machine!

Phil

[CussCuss]

im going to be running a ceramic turbo on mine, i wouldnt want to put my stock bottom ended block through over 14 psi so the turbo will suit it well

[DD Phil]

im going to be running a ceramic turbo on mine, i wouldnt want to put my stock bottom ended block through over 14 psi so the turbo will suit it well

Be VERY careful when rotating the housings, the slighest lateral movement will snap off the exhaust wheel.

Phil

[TD05]

Yep! : )

Are you going to tell us? :D

c'mon Nachoman what's the deal, I rang toyota and they laughed when i told them the part number was Yep

tell us the real part number and i tell you another secret :D