Nolimit's Re-Build Thread

[DCaff300ZX]

^^^Thanks Ace on ECU, heard the same from my swap guy but also thought during research that I read where there was something to do with ECU mapping and the idle settings- for takeoff where AT is always under load, and MT not when clutch depressed/engine idling under no load? He says he can tune me to happiness with Nistune, just am not into tossing a grand+ into my 218K motor and am looking for reasonable alternatives...

[NolimitZ32]

The nistune is being prepped by Houston z as i type this. picking it up monday so hopefully that solves the issue. I am very well aware what the AFRs are supposed to look like, which is why I freaked when I saw this DCaff that loaded feeling is probably the car retarding the igntion timing

[DCaff300ZX]

^^Thanks NoLimit...I assumed the same as it seems to be somewhat rich/? when the problem occurs causing ECU adjustments, and the resulting lack of performance which is why I am thinking that the ECU is wrong for the swap, bad fuel map like yours may have, or fried?
Definitely interested to hear what you think with Nistune and if it cleans things up!

[legion]

Nistune is awesome. I got it through houston z as well and had a premade tune for my exact mods. I plan to have it street or dyno tuned once I swap in a new block (and maybe some dual mafs too lol)

[NolimitZ32]

Yeah man, I'm pretty excited, I hope it fixes my issues.

[jona300zx]

hey man i see you almost have it running! we need to get together for a cruise!

[es.biggs]

You're overdue for a major pic whorage when she's back on the road

Good luck man, just read the whole thread. Cool stuff. I know how much work it is - and how rewarding it is in the end. Hope you can get those gremlins chased away

[NolimitZ32]

Thanks guys, and yeah this weekend the weather was perfect I was itching to go on a topless cruise to the seawall for some g-town pic whorage, but couldn't

[NolimitZ32]

Ok so Nistune through Houston Z fell through (Dane is loaded up and doesn't have time) so I am in talks with the Aussies to get it direct. If I get it from them I'll be doing the tuning myself. In the meantime I have finally found the problem err problems.
1) Cyl 5 is flooding for some reason, the inj seems to have a pulse when tested with a screwdriver but I wont know for sure till I pull it, I went to ohm it last night but my multimeter decided to take a s*** so woohoo more money spending on tools. So here is the plan: Got 94 lower plenum on the way, looking for 93/94+ fuel rails, I'll be using factory Subaru STI injectors (same ones I'm running in my WRX) in the Z, they are physically the same (made by JECS) but cost muuuuuuch less than any of the Nismos (used can be had 4 injectors for $150 + $18 a piece for cleaning and bench test), come stock flowing 520cc and can be modified to flow 850cc.
1.5) When I do the plenum pull I'll be going over every single vacuum line very carefully as it seems I also have a fairly large vacuum leak somewhere.
2) When I tested the O2 outputs in test mode II I am getting inconclusive reading so I'll be swapping those out very soon to see if this changes the unstable idle and rough running condition. I already have the sensors so no extra money spent there WOOOHOOOO.
3) Once the above 3 are done and if the car starts running semi normal and not flooding any cylinders or having other s*** issues I'll be ordering the Nistune for my NA 16bit ECU so I don';t have to deal with the 3rd speed fuel controller issue on a TT ECU and hopefully taking her out for some pic/video whorage and some high speed runs with my multi-vehicle-brand crew.

Its been a pain but the way I see it is with every new discovery I'm one step closer and getting to know the car better than I ever hoped to do so I won't be a negative Nancy no matter what, in fact you can call me Positive Pete cause I'll maintain a positive outlook on this and I am not giving up damnit!

[BigTDogg (MA)]

come stock flowing 520cc and can be modified to flow 850cc.

Bad. IMHO, use them as 520s or get the upgraded sizes. When injectors are bored out to flow more, it's a peak number and the flow curve goes to s***. I understand you're trying to do this as economically as possible, but this will make your tuning a living hell.

Vac leak, check the fuel rail to lower plenum sealing. Also check your brake booster and IACV valves and their assocated hoses. Zip tie every vac connection.

[blue13]

come stock flowing 520cc and can be modified to flow 850cc.

Bad. IMHO, use them as 520s or get the upgraded sizes. When injectors are bored out to flow more, it's a peak number and the flow curve goes to s***. I understand you're trying to do this as economically as possible, but this will make your tuning a living hell.

Vac leak, check the fuel rail to lower plenum sealing. Also check your brake booster and IACV valves and their assocated hoses. Zip tie every vac connection.

http://www.motoiq.com/magazine_articles ... ctors.aspx pretty informative article by jim wolf regarding fuel injectors and tuning.

i agree, fuel injectors i just don't want to mess with.

[NolimitZ32]

Way ahead of you man, I've spend the last month under the hood of that car checking every electrical component and I have checked the fuel rail to plenum connection for leaks as well, thanks though and yes zipties on all vac lines I know, believe me i've had enough vacuum headaches already, everything is getting sealed and attached as permanently as I can get it. I am planning on running them at 520, i don't need more out of them and would only get the caps cut if I needed to get more than 520 out of them. I've played with the tuning of chopped injectors on subies and its not too bad, at least the top feeds weren't bad and those go from 440cc to 820cc, but like I said they're goin in as 520cc in stock form.

Blue:
I've seen that article a million times, modding injectors is a pretty big thing in the Subaru community and lots of people have great success with them because they don't get drilled out, they get cut. The only problem with cutting is sometimes you get a s*** spray pattern which is usually why people will mod 6 injectors and use the 4 best ones.

[RubyRed300ZX]

I have a set of '93 fuel rails; though, they are off a N/A not a TT.

[NolimitZ32]

You have PM sir.

[NolimitZ32]

UPDATE: My Z is finally Roadworthy and whats more Road-legal, I got my registration last week and added it to my insurance, then got my "inspection" done over the weekend so now I'm sticker-ed and insured up and ready to rock and most importantly roll! YEAAAAH! In the works ATM is a custom made cat-back and hopefully in a very short time a custom downdraft split FMIC and some custom 2.5" intake piping which I will be making instead of buying (No offense to Ash or Z1 but 1k+ for some pipe, f-in really?)

P.S. if any of you Houston guys are down for a small Z oriented Meet and Greet and Eat (or drink, within legal limits though ) hit me up here or on FB if you have me. I live in Clear Lake so good possibility of Galveston Cruise next weekend.

[300ZXttZMAN]

UPDATE: My Z is finally Roadworthy and whats more Road-legal, I got my registration last week and added it to my insurance, then got my "inspection" done over the weekend so now I'm sticker-ed and insured up and ready to rock and most importantly roll! YEAAAAH! In the works ATM is a custom made cat-back and hopefully in a very short time a custom downdraft split FMIC and some custom 2.5" intake piping which I will be making instead of buying (No offense to Ash or Z1 but 1k+ for some pipe, f-in really?)

P.S. if any of you Houston guys are down for a small Z oriented Meet and Greet and Eat (or drink, within legal limits though ) hit me up here or on FB if you have me. I live in Clear Lake so good possibility of Galveston Cruise next weekend.

So how did you fix the problem??? Un modded injectors???

[NolimitZ32]

No there were some grounding issues and a few vacuum leaks I had to chase down. The Venoms suck a fat, hairy, gonorrhea infested PEN15 at idle and low loads but at WOT they are just as good as anything else. The car is blah at low revs because the fuel mixture is so inaccurate but above 3500 and especially at WOT its a beast, it gives a little tail wiggle when the boost comes on in 4th which is so fun ,mind you through all this my Subie is still much faster from 0 to 100 but from 100 to wherever the Z has such awesome pickup.

[300ZXttZMAN]

Well hell yea im glad to hear you got it running you should post a video

[NolimitZ32]

I might try to get one today. I have some yard work to do when I get home (when it cools down some) after if I have the time I'll try to get some quick vids.

[300ZXttZMAN]

Ok cool

[NolimitZ32]

Got a little present in the mail today with a big Z1 on the box, I wonder what it could be?





In addition I picked up over the last few weeks some STI injectors 520cc, some pigtails from TLF (Venoms suck a** but Tom at TLF is a really good guy always willing to help, has swapped numerous venoms for me and hooked me up on the brand new pigtails) a second MAF from legion/Matt (sorry that you gotta part it out dude but at least a small part of your car will be around so you can always see it) and a second MAF pigtail from Mark/300zxTTMAN (thanks for the hookup dude)


Now I just need to take the injectors to EngineLogics/InjectorRX, get them cleaned and tested and I'll be ready for safe 15psi (kinda tired of running wastegate boost, but better safe than sorry)

[nuttin but Z32]

Non-stop updates
Sweet!

[300ZXttZMAN]

Hell yea

[NolimitZ32]

SO I haven't done much to the Z lately and since this thread hasn't seen the light of day in a while I'll go ahead an put this up here. The dual intake is not yet on and I haven't switched from the Venoms to the STI injectors yet (waiting on the Nistune to do all that) however, driving around on Wednesday night I decided it was time, braved fate, and cranked the boost from .5 bar (7.4 psi) which is what I was running it at at for the first 2k miles (extended break-in) to 1.1 bar (16.7 psi) and WOW!!!! I now have absolute need for wider tires out back. Running through the gears on the NA 225s, it kicked out the rear in 1st, 2nd, 3rd, & 4th, what an amazing feeling having your car try to kill you with every shift. Overall I couldn't be happier with the result, no lag (gotta love the tiny stock turbos) and butthole-puckering performance

[BigTDogg (MA)]

Were your STI injectors new or redrilled Deutchwerks?

[NolimitZ32]

Tony, what kind of question is that? After having the Venoms I'll never run ANY remaned/redrilled injectors again. The STI units run 520 with caps and 850 without caps. For the time being they are stock (not yet installed), once I have the need I'll be removing the caps (no re-drilling of any sort)

[BigTDogg (MA)]

Just looking for a decent LGT upgrade. Definitely don't want to do doucheworks, though many subie guys swear by them.

[NolimitZ32]

Your LGT should have the same yellows as the STI, In fact AFAIK if the the same exact EJ257 as in the GD STIs, I know lots of guys that run cap-less injectors and do just fine ( a few of these guys I know personally, like been inside their short-blocks personally), as far as remans/redrills go lots of guys run DWs and Witchhunters without issue.

[NolimitZ32]

Little update, as some of you know I recently blew the coolant seal on my DS turbo (stocker), as it happens I came across a BAMF deal and have just purchased 2 - HKS2530 turbos that are being loaded into the back of a UPS long haul truck as I type this I was planning on holding off with the big build for a few years but I guess here it comes, look out for updates as they come.

[300ZXttZMAN]

Little update, as some of you know I recently blew the coolant seal on my DS turbo (stocker), as it happens I came across a BAMF deal and have just purchased 2 - HKS2530 turbos that are being loaded into the back of a UPS long haul truck as I type this I was planning on holding off with the big build for a few years but I guess here it comes, look out for updates as they come.

YES!!! Big build