Hi Guys,

My boost was increased from 7psi to 14psi today and man its very quick.. big big difference. The car was road tuned and will go on dyno next week. My tuner said that I can drive the car for the weekend but I would like to know how safe is running 14psi.. he said that my car is doing about 470whp. It was running 380whp on stock engine with 7psi. Its really a big difference now. plz see the following for my list of mods.

https://my350z.com/forum/new-owners/274462-my-twin-turbo-veilside-350z.html

Do you perhaps know what the max i could get out of my car with the Unichip running at 14psi with standard APS 440cc injectors.

Regards

 

Hold on...Your running 14 psi, on the stock 440cc injectors,fuel system and Unichip? That is NOT a good combo for longevity man..Those injectors are maxed out at 450-460whp from our experiences.

 

What PSI would you recommend? and can I just change my injectors and leave the Unichip.. I am planning to go Haltech but only at the beginning of next year.
I am also adding water meth injection next month.

Also what is the worst that can happen with current boost at 14psi. By the way we have awesome Unichip tuners +- 8 years experience with Unichip.. Its made in SA as well. Also the 470hp above is an estimated value my tuner gave me. What should 14psi give me on my build.

 

Alot can go wrong..If the car goes lean especially in the cold weather, you can do damage to your motor..I wouldnt reccomend above 11-12 psi on a piggyback like the UniChip, Just be careful man...A built motor is alot of $$$$ to blow up.

 

What fuel system u have available for my car which will work with my unichip?

 

You can´t run more than 11 lb with the 440cc injectors , when I have my built engine with the unichip , and the aps fuel return , the 440cc injectors were max out with only 10.5 lb ( 440rwhp )
I would recommend that don´t raise the boost at no more than 10 lb , until you get a tune.....

 

buy a utec and get ANY FUEL SYSTEM.....ie bigger injectors...prob 750cc...i have altered atmospheres fuel return...no probs....

 

We do not have any UTEC tuners.. only excellent Unichip Tuners.. I am going for HALTECH next year.. Is there anyone that is running Unichip with bigger than 440cc injectors? Will the 750cc work with Unichip and what is the max my fuel system can handle.

 

No , you can´t run more than 440cc injectors with the unichip , is only +-50% maf correction , unless you have reflashed your ecu for biggers injectors ,anyway is not recommended that you run more than 10-11 lb with only maf corrections , you would need a map sensor.

 

if u want a cheap piggyback i was using the apexi afc-2 with the 750's before the utec...too bad i dont have it anymore....u could pick that up for like 250

 

If you wanna run higher boost, considering going to the Haltech sooner maybe?

 

Does anyone know someone on the forum that is running 480whp+ with standard APS injectors, fuel system and unichip?

 

On a stock compression motor, you could do 500 whp on the APS injectors, fuel system and unchip, but not on a dropped compression motor.

I completely maxed out my injectors at 14 psi midrange and had to taper to 11 psi at redline (8.8:1 CR). car made something like 450 whp.

At 14 psi you may be fine if it was tuned like my car was, but if you are running 14 psi at redline, no way will that hold up on those injectors. You can definitely just upgrade injectors and retain the same fuel system, but tunning will become an issue. If your tuners are good enough and know a few tricks, you may be able to run the unichip with a 500+ cc injector. Atherwise, look at picking a unichip Q, I believe that does injector scaling.

At this point, I wouldn't run the car at 14 psi. Stick to like 9-10 psi and be happy with that until you upgrade the two most important components - EMS and Fueling

 

What does that mean?

 

Hi, I just bought a water/meth kit.. what will happen if i add this to my build without tuning it. Also, how do i get my boost to drop to 11psi at redline. How long did you drive your car with that setup?

 

I wouldn't mess with the water meth kit. I would have your tuner/shop set it up for you. You can get a unichip module to control the meth injection.

You should be able to adjust the boost controller, unless you are using the supplied unichip solenoid. If you are using that, you will have to have your tuner turn the boost down.

I ran my setup for about a yr on the 14->11 psi tune. I ran that until a proper EMS was released and then I jumped up to an HKS Fcon Vpro and APS Extreme fuel system