Boost Controller

Post by **tony31** » Sun Sep 26, 2004 4:40 pm

I was looking to put a boost controller on my 91 z32. Im kinda worried about damaging my turbos and or engine. The car has 75k miles on it. I was thinking about upgrading the injectors also to 555cc. i was wondering how much boost i can safely run on 93 octane gas with the stock injectors. Also is there anything else i would have to do or should do before i get the boost controller?

Post by **aaacomp** » Mon Sep 27, 2004 3:53 pm

Profec B-II boost controller works great. Changing to 555 requires upgrading the ECU too. 15 Lbs is max on the 370 injectors and stock turbos. Some people will disagree but the cfrm on the T-22 is only good for 304 cfm. I assume you have an engine in excellent condition.. I have three different chips for the 555 injector rich and lean and with a dual pop on it.MOst guys mess up putting the injectors in by twisting the 0-rings. Put some petroleum jelly on the 0-ring and insert with a quarter turn. The stock fuel pump is good for 600 hp so need to change it. While you have the upper plenium off you could polish the intake and do the coolant line removal. If you're car has been taken car of and hopefully you have a turbo timer. You should be able to take it to the Stage III upgrades with no problem. The 555 is a Stage IV and above. A consult or Nprobe is great to set timing TPS, Injector balance, idle , etc.

Post by **tony31** » Mon Sep 27, 2004 6:12 pm

You make that sound so easy. Im pretty good mechanically but im a little hesitant to work on my own engine. How hard is it to do? Are there any help guides or websites? The stock injectors can go 15 lbs of boost for each turbo right cuz theyre already at 14 total. So you are saying there is no need to upgrade the injectors for stage III upgrades? or only 15 psi total cuz of ecu? where did u get your injectors?I have a turbo timer since i bought it but the guy before me loved the car so much and said he let it cool down every time he drove it. the engine and turbos are strong.How much is a consult or nprobe and where can i get one?

Thanks for the help-Tony

edit-do u have a private email address or aim or somethin we can talk on?
Modified by tony31 at 9:38 PM 9/27/2004

Post by **PalmerWMD** » Tue Sep 28, 2004 2:32 am

Tony:

Plz dont take it to IM , all of us would love to follow this discussion.

Fred..

Post by **boileralum00** » Tue Sep 28, 2004 8:21 am

One thing not mentioned, is that you shouldn't run a boost controller without an upgraded ECU, even with stock injectors. The reasoning behind this is that the stock maps don't go past 12psi (or something around that level). You can run 14-15psi safely on stock injectors w/ 93 octane, and can even run quick bursts (like at an autocross or the drag strip) up to 17psi pretty safely, but you will definitely be beyond the efficiency of the turbos at that point.

Post by **tony31** » Tue Sep 28, 2004 4:27 pm

I see... so i should definately get the ECU before i do anything else.... Is Jim Wolf good for ecu? also I am still confused when you say "You can run 14-15psi safely on stock injectors w/ 93 octane" do you mean on each turbo or total? If im not mistaken it already runs 14psi total so im assuming this is for each but just to clarify. Thanks

Tony

Post by **boileralum00** » Wed Sep 29, 2004 4:54 am

Stock boost for a TTZ is 9psi. If you are already running more than that (as measured on a good aftermarket gauge, not the crappy inaccurate stock gauge), then you may already have an aftermarket ECU and boost jets installed. Pull up the floor mat, carpet, and wooden floorboard on the passenger side and look at the ECU. If it has an aftermarket chip it should say Jim Wolf Technologies or Z1 or AshSPEC or something similar.

Post by **tony31** » Wed Sep 29, 2004 11:06 am

how come the stock boost gauge says 14 then?

Post by **boileralum00** » Thu Sep 30, 2004 5:58 am

Your stock tachometer goes past 8000 rpm - do you rev that high? The stock boost gauge is notoriously innacurate and slow to react in our cars. Get a good quality aftermarket gauge before playing with the boost levels - or a good electronic boost controller that has an easy to read gauge on it.

Post by **aaacomp** » Tue Oct 05, 2004 4:18 pm

The ECU upgrade for Stage III is readily avaible thru Z1, JWT, Z from Japan I even have them to read more if you have any kind of programing background go to http://www.ztechz.net and learn the maps for yourself. If you look on the Infiniti forum or even ask Azhitman or Palmer they know me from providing the ECU upgrade for the Q45 1st generation along with a water /alcohol injector system for the Q45. To start using the higher boost levels you need to check the condition of your engine and ALL hoses before proceeding. The number 1 problem with the Z and upgrades is Boost Leaks due to aged hoses and clamps. You can upgrade your engine by doing the EGR and Coolant by-past. The number 2 problem with the Z is that of idle and rpm hunting due to aged Air regulators and AIAA (may have the AIAA name wrong but it's connected to the air regulator). BTY the injectors in the Z32 and 1st generation are the same 370cc side feed. If you decide to go further find someone or shop that has the consult.. I use the username TXQ45 on Ztech and other forums. The user name here was one I carried from Yahoo in which Q45tech and a few of the orginal Q45 group changed to NICO while it was still under Birkmire...

Post by **tony31** » Wed Oct 06, 2004 8:15 am

Yea i had tests run on my car using nprobe. The only code that showed up was 34 which is the detonation sensor. The guy said if i buy a new one i can easily relocate it to the rear of the head. I was wondering if my #5 cylinder not firing when idling cause the ecu to throw that code. I dont want to buy a new detonation sensor if its working fine.We pressurized my intake system and there were no leaks.One of the o2 sensors was dead so im putting 2 new ones in. could this possibly be the reason for my #5 cylinder not firing (only when idling)?I have decided to buy a new ecu before anything else.

Post by **aaacomp** » Wed Oct 06, 2004 3:08 pm

I hope you mean upgrade your ECU (eprom) not replace the ECU since your ECU is throwing codes. From what you've reported there is no need to replace the ECU. The knock sensor and/or wiring is a problem for the Z's. I just replaced one over the week end and relocated it.. The wiring was brittle and had old electrican's tape wrapped around it. Once the new knock sensor wiring harness and sensor had been relocated I cleared the code from the ECU and the car now has boost and idles smoother. BTY the knock sensor for the Z32 is the same one for the Q45,J30, and of course the 300zx NA. If a rod is turninged on the Z it is most likely the number 5 cylinder just a for your information .

Post by **tony31** » Wed Oct 06, 2004 4:29 pm

not buying the because of codes lol...for performance.... before anything else like a boost controller (what this thread was originally about). Well the #5 cylinder does not fire when idling but as soon as i touch the gas it fires again and is smooth. Its kind of weird.Back to the knock sensor. My car doesnt seem to be running safety boost. The car runs just the same as it always has (ive had it for a little over a year) with the exception of the rough idle caused by the #5 cylinder. So i should buy a new wiring harness for the knock sensor also?

Post by **aaacomp** » Thu Oct 07, 2004 1:16 pm

Yes, the harness is cheap compared to the sensor replace it at the same time. The knock sensor relocation that I've done is on the rear most bolt on the plenium. You'll need a bolt about 1/2" longer than the one in it now. The number 5 cylinder is a problem on the Z along with the Q . Except for the fact that the casting on the Z has extra flashing on it.. Most rebuilders do a little extra flashing removal when rebuilding because of it.