nissax 200sx turbo .. will this help with a bit more poke !!

[shaun207]

hi just bought a nissan 200sx 2lt turbo .., it has a upgraded manifold and a de-cat pipe , will fitting the following help with a bit more power ..

front mounted intercooler set ( also trying to keep things cooler )
dump valve
and a cat back system ..

i dont want it to drink too much fuel as its also used day in day out etc ,to work ..

also it doesnt have a boost gauge , is it worth turning the boost up with a manual boos controller and fitting a gauge ... what sort off psi are they running as standard and what can you go up to .... cheers shaun

Edited by shaun207 on Wednesday 7th October 23:22

[300bhp/ton]

shaun207 said:

hi just bought a nissan 200sx 2lt turbo .., it has a upgraded manifold and a de-cat pipe , will fitting the following help with a bit more power ..

front mounted intercooler set ( also trying to keep things cooler )
dump valve
and a cat back system ..

i dont want it to dring too much fuel as its also used day in day out etc ,to work ..

also it doesnt have a boost gauge , is it worth turning the boost up with a manual boos controller and fitting a gauge ... what sort off psi are they running as standard and what can you go up to .... cheers shaun

An intercooler isn't about cooling the engine. It helps reduce IAT's the heat primarily is caused by the compression of the intake charge from the turbo. Residual engine heat and exhaust heat will have an affect but isn't the primary reason for running an intercooler.

SO yes low IAT's should result in more power.

However in terms of boost, well this is a mute point IMO.

Firstly where are you going to be taking a reading from? A boost gauge straight off the turbo will often give a different reading to a gauge taking a reading from the intake manifold, with an intercooler in there this might make more variance.

Also boost pressure is not all that handy, its more about cfm flow.

Thing about a push bike tyre and a large 4x4 tyre, you could inflate both to 40psi but the 4x4 tyre would have a lot more air in it.

Turbo's are the same, create a restriction and boost pressure will increase, remove the restriction and boost will drop but the flow rate would have remained fairly consistent.

I'm not sure what levels these cars will take stock, but its about the a/f (air fuel) ratio, run it too lean (too much boost or not enough fuel) and it'll detonate all over the show and wreck the engine fairly quick.

Get it right and plenty of power, providing the internals can cope with it.

Sure someone else will chip in with more specific 200SX info.

Oh BTW - turbo tuning will generally decrease mpg.

[sparkyhx]

shaun207 said:

hi just bought a nissan 200sx 2lt turbo .., it has a upgraded manifold and a de-cat pipe , will fitting the following help with a bit more power ..

front mounted intercooler set ( also trying to keep things cooler )
dump valve
and a cat back system ..

i dont want it to dring too much fuel as its also used day in day out etc ,to work ..

also it doesnt have a boost gauge , is it worth turning the boost up with a manual boos controller and fitting a gauge ... what sort off psi are they running as standard and what can you go up to .... cheers shaun

firstly get over to http://www.sxoc.com/vbb/index.php

standard is 7psi in 1-2nd and 10psi in 3-5 gears
You won't see any noticable power gains from the mods you have cos at the end of the day its the boost pressure that determines the power. However it will breath better and probably boost better upto the set limit.

If its got a manifold and decat the chances are its previously been modded and the owner has returned it to 'Standard' so some of the stuff below may already be done.

1) First mod u need is Walbro fuel pump - standard ones are good for about 70k and will fail with no warning - they also will not cope with higher boost levels. get yourself one or confirm its not already got one.

2) Colder plugs - may already be done

3) run on V-power or similar

4) better/new air filter/induction kit - may already be done

5) Bigger exhaust - you sure its not already got this?

6) boost guage

7) boost controller and up the boost to around 12-15 psi

8) FMIC cos the WMIC is a known fail point although FMIC is not necessary it cam help on hot summer days

9) chipped to get the best out of the above (may already have been done)and usually helps with MPG

You will then be at full stage 1 and be putting out around 260-280bhp

Now start thinking of brakes and suspension - some will say sort these out first.

after this you are talking big money - bigger injectors - bigger turbo, AFM, remap, stonger internals etc etc.

As for your questions
1) Dump valve will do nothing -
2) Its unusual to have decat on a standard exhaust - are you sure it needs a catback system
3) FMIC is not absolutely necessary and doesn't directly increase the power, however it just keeps the charge temps down which does help with power particularly on hot sunny days when the WMIC is struggling.

The more you deretrict it there is a tendancy for more boost spikes so you may end up with an electronic controller rather than manual controller.

the best way to stop it drinking fuel is to drive with a light right foot, the more you press the load pedal the more it will drink.

Lastly learn to drive a RWD car if you have come from FWD - we are just getting into killing season for 200sx'x

These cars can bite big time - beware

EDIT - Get good rubber all round.

Edited by sparkyhx on Wednesday 7th October 10:16

[shaun207]

hi thanks for your help ..
it had a new manifold fitted as the original one had a crack in it , so that was the reason why it was upgraded , along with the decat pipe at the same time ..

and im not new to rwd , ive had various rwd cars , sierra's ( x4 ) , beemers and a few hot hatches , and ive also raced 1:1 cars for 16yrs ...