I've had one in my Z now for a little over a month and 1,000 mi. No blown engine and dynoed 404 HP on 91 Octane. Stock 7 psi boost. Stock internals.

 

thats awesome, good to hear good reviews about APS

 

Do you plan on doing the internals? How much stronger does it feel?

 

I too am awaiting feedback(and a price drop!!!! )

 

Hey really good power for a Twin Turbo Z on 93 octane fuel Zero2prove, shame that the weather is so ugly at the moment.

I'd love to see what time this Z would put down at the strip, can't wait for summer to arrive.

Peter

 

i cant wait to race him this summer

 

yeah, so you're gonna let us chicago guys know the when 'n where so we can all verify the results, right?

 

I think this will be a very interesting summer for all of us.

 

My APS having a problem with A/F Ratio
The more Problem is we don't have Dyno at my Island

This is MY Innovate LM-1 Show
At Idle 12.5 ~ 16 Jumping
below 0 Boost 12 ~ 15.5 Jumping
70 kpa Full Boost 7.3 ~ 8 Super Rich.........

I call Rosihan but even Brainstorm Performance Can't do noting
Bause they need Dyno sheet for remap the APS ECM.....
As you can see the below I had 9.5:1 CP Piston and Pauter Rod

So now I don't have choice I keep Driving Super Rich condition
Until I get some money ($5,000) ....... then I can ship my car to Brainstorm for Tuning

One more thing other then my A/F Ratio APS Work Very Nice

 

Nitrous,

You've got some extensive mods there. Even with all those mods your car shouldn't run like that. I have a feeling that something is messed up with the install.

 

nitrous350: are there any more mods than you have listed in your signature? Are you running the APS return fuel system or a different one? If not the APS fuel system, can you tell us what your fuel pressure is at different points?

 

I do plan to go the forged internal route next year. I've collected Pauter rods, Arias piston and head and main bolts. I hope to find a used block to build and then swap it out when I can get the coins together.

With APS TT kit the car "feels" a hell of lot stronger. I currently have a pain in my neck which I suspect comes from the whiplash caused by the acceleration.

 

At idle the engine should have an air/fuel ratio of 14.5 to 1, you may find you have a problem with one of the o2 sensors.

Do you have stock cams in this engine? If not what are the specs on ther cams you have?

Don't you have any experienced automotive techs on your island who could check the basics on your Z?

Peter

 

O.K
1> My Fuel system is APS System but my AAM Fuel System is on the way ( from GQ GB ) every one knows this .......

2> Fuel Pressure
At Idle 400 KPA
0 Boost = Drop Down to 360 and came back to 400 KPA
70 KPA Boost = 465~ 470 KPA Fuel Pressure........
I'm Used SARD Fuel PUMP not APS FUEL PUMP

3> Messed Install ?????
I did check two times Fuel and Vacum line but No Problem Find out

4> More MOD. === Yes
I removed APS Boost controll Solinoid and Install HKS EVC II Boost Controller
( My EGT was 800c in Full Boost , sensor mount 3" away from the Head )

Now I'm sending my car to Guam Island cause They have Drag event on this saterday so now i can have my Time Sheet

At track I'll shot some nitrous System mounting complete (How many shot?? I don't know base on A/F , EGT , knoc)

 

Thank you Peter

At idle the engine should have an air/fuel ratio of 14.5 to 1, you may find you have a problem with one of the o2 sensors.
You Mean Stock O2 sensor or my Innovate O2 sensor ????
Do you have stock cams in this engine? If not what are the specs on ther cams you have?
Nismo Cam
262 Degree Duration
.426" Lift
Cold Lash - .010" to .013"

Don't you have any experienced automotive techs on your island who could check the basics on your Z?
No experienced automotive techs in Saipan

As my car in Guam this week I'll looking for some one in Guam
I might be check nissan tech to check my car with Consult II

 

I would think that your pressure at 0 boost up to 10 psi of boost sounds about right to me... however I can take a shot in the dark here... i have APS kit here but I have not run it or tested any of that stuff....

Peter should be able to answer this... but with the APS 1:1 regulator I believe that your fuel pressure should be quite a bit lower at idle... and too much fuel pressure at idle could be making it hard for the closed loop cycle to maintain proper A/F.

If I am at all on the right track... its possible that the output of your SARD fuel pump is high enough that the factory siphon and swirl pot jets are too restrictive and causing a fuel pressure spike at idle when your return fuel ammount is the greatest.

What do you think Peter? What is the APS supplied fuel pump rated at?

Being that I havent run the APS kit yet and seen with my own eyes what fuel pressure it operates at, nor have I used the particular regulator that comes with this kit... but I would assume it is not only a 1:1 rising rate, but that it is probably a standard 1:1 meaning that under vacuum it will drop fuel pressure from base setting.

Could I be on to anything Peter?

 

I thought you may have had a problem with one of the factory o2 sensors as this is the signal the ECU receives to keep the engine running at stoich in idle conditions (14.5 to 1 air/fuel ratio).

With regard to the cam specs, is that the duration at 50 thou lift, if so that quite a big camshaft and this will cause idle problems as the vacuum at idle will be very low.

I'm 99.99% sure that the cam spec (size of the cams) will be the cause of the strange air fuel ratio at idle.

Peter

 

I had mind around 1000mil with After market Boost Controller
( HKS EVC II and Boost up 10 PSI )
Now I'm warry My 5AT Trans. not Engine.......
But I get little Problem on A/F Ratio (Super Rich on Full Boost 7.3:1)

 

My Vacuum at Idle is 0.5 Kpa and RPM is 750 ~ 800 at Idle

 

Isnt that waaaaayyy to rich??