im building a a14 t25 setup with a cd175 (1 3/4 su) i have a a14 block stock and a h75 head with a boost retard dizzy and am planing to have it up and running in the next few weeks.

WAT I WANT TO KNOW IS ?? how much boost do or have people run with a setup like this in the past with a draw through setup running no cooler ect??

im wanting a little more power but the 17psi my a12 ran was a little too much for the old a12 to run lol :P

5 psi w/o intercoolor
10 psi with intercooler

Stock block can take this. If you go higher boost then fit special parts, o-ringed head gaskets and the like.

With no cooler I'd be very careful, 5psi would be all I'd attempt and even then make sure you keep an eye on things.

You're getting it set up on a dyno, or at least with a wideband yes?

i ran 15.5 psi on the a12 for nearly 2 years and it never broke down.

i was hoping to run 7 to 8 as i cant run a cooler with a draw through setup

but you can run the best detonation supressant of all - meth / water injection.

remember this thread???

http://datsun1200.com/modules/newbb/v ... ASC&type=&mode=0&start=20

an intercooler will give you lower intake temps but thats only a part of the picture.

From the Garrett website...

Three primary factors that influence engine knock are:

Knock resistance characteristics (knock limit) of the engine: Since every engine is vastly different when it comes to knock resistance, there is no single answer to "how much." Design features such as combustion chamber geometry, spark plug location, bore size and compression ratio all affect the knock characteristics of an engine.

Ambient air conditions: For the turbocharger application, both ambient air conditions and engine inlet conditions affect maximum boost. Hot air and high cylinder pressure increases the tendency of an engine to knock. When an engine is boosted, the intake air temperature increases, thus increasing the tendency to knock. Charge air cooling (e.g. an intercooler) addresses this concern by cooling the compressed air produced by the turbocharger

Octane rating of the fuel being used: octane is a measure of a fuel's ability to resist knock. The octane rating for pump gas ranges from 85 to 94, while racing fuel would be well above 100. The higher the octane rating of the fuel, the more resistant to knock. Since knock can be damaging to an engine, it is important to use fuel of sufficient octane for the application. Generally speaking, the more boost run, the higher the octane requirement.

This cannot be overstated: engine calibration of fuel and spark plays an enormous role in dictating knock behavior of an engine. See Section 5 below for more details.

run methanol/water injection, makes a big difference to a suck thru setup

yeah i do remember that thread!!
i ran my sc setup for like 6 months with lots of problems and it still went till the head bolt snapped.
was thinking i shouldnt have sold the water/meth setup with my sc setup. oh well. i remember a thread about someone using a washer bottle as a cooler by memory can anyone remember this.??
how to go about setting up something dirt cheep as im trying to keep cost down.

keep the boost down- way cheaper

more boost is more fun