To rom tune or not?

[Tom N]

Trying to decide if it would be really worth talking the car to Z-Fever and having a rom tune done at this time.
The car is a fairly stock swapped 98 240sx
Has a S15 swap with the T28 BB turbo and 480 injectors, a fmic, boost controller, 255 fuel pump, 3in turbo back exhaust and if I do the tune I will swap the stock maf out for a Z32 maf.
The rom tune for a S15 is a bit more that a s13/s14 and not sure if its really worth the money at this time.
Whats the consensus on doing this at this time? Should I expect much from it with the car fairly stock?

[fliprayzin240sx]

I would wait until you atleast get some 550cc, then get it tuned for 16-18 psi.

[Tom N]

I would wait until you atleast get some 550cc, then get it tuned for 16-18 psi.

I had considered ordering some Five-o 550's before doing the tune but I keep hearing that the 480's will be fine at that boost level.
I'm running 15 psi now and a/f on the wide band looks fine.

[jr_ss]

550's or bust...

[Tom N]

550's or bust...

550's cause I actually need them with the stock turbo or because I will need them one day when I upgrade turbos.

[jr_ss]

Because you're already pushing the limits of the 480's at your power levels. Why keep pushing the limit? Give yourself some breathing room, rather than risking 100% DC.

[fliprayzin240sx]

480 would be maxing out at about 300whp.

[Tom N]

Guess ill order up some 550's then. I believe Enjuku Racing has them on sale right now.

So with the 550's and Z32 maf will one of these enthalpy tunes by Martin be worth it on the stock turbo?

[bussitcustoms]

I have a similar setup, also 480cc injectors. I max them out at 16psi, and around 285whp. I told my tuner to keep the setup reliable- so while I'm sure you could get 300 from them, 550's or bigger would be ideal.

[fliprayzin240sx]

Personally, I'd go buy some 740cc. You're already gonna buy a set, why not buy a set that will be able to handle almost anything and everything you can throw at it.

[codyace]

Guess ill order up some 550's then. I believe Enjuku Racing has them on sale right now.

So with the 550's and Z32 maf will one of these enthalpy tunes by Martin be worth it on the stock turbo?

A Enthalpy tune will work fantastic in your setup. Turn key reliability, no worries, no issues :D

Personally, I'd go buy some 740cc. You're already gonna buy a set, why not buy a set that will be able to handle almost anything and everything you can throw at it.


For the negligable cost difference between injeectors, I agree with this.

[fliprayzin240sx]

Shit, I'd even consider SARD 850s...that will definitely be the last injectors 99% of zilvia will ever need. And I say SARDs, not some knock off/overflowed injectors.

[Tom N]

I am not a big fan of going with parts that are for hp levels you will never reach. I would never buy a turbo that can make 600hp if I never intend to go over 400. This is a every day car that will never exceed 400hp. Honestly it will probably never exceed 350.
The bigger the injector the harder they are to controll at low duty cycles. 850's would be severe over kill on this car.
I agree 850's would be all the injector most people aiming at high hp would need. I made 650 hp on my 4g63 with 850's. but like I said. I'm not going over 400 with this car.

[fliprayzin240sx]

I am not a big fan of going with parts that are for hp levels you will never reach. I would never buy a turbo that can make 600hp if I never intend to go over 400. This is a every day car that will never exceed 400hp. Honestly it will probably never exceed 350.
The bigger the injector the harder they are to controll at low duty cycles. 850's would be severe over kill on this car.
I agree 850's would be all the injector most people aiming at high hp would need. I made 650 hp on my 4g63 with 850's. but like I said. I'm not going over 400 with this car.

Nopes, not necessarily. Thats why I said SARD 850. They will idle like stock on a rom tune and PFC. Honestly, I'd run the 740cc in your situation, just in case you get the itch to upgrade the S15 turbo down the road to a GT2871R.

[MADE]

It all depends on the price and the tuners ability.

COA A: Are they are going to make you a custom map via street or dyno tune, for what your doing that cool if the price is right.
If you have the money go with 740's incase you upgrade later. It sucks to buy injectors twice.
(I would expect more if they're any good you will notice a significant difference, but don't expect alot of HP on paper)

COA B: Or give you a generic tune for mods XYZ?
In this case I would go with a FPR with the stock injectors, to help you out a bit.
(Unsure of it worth the noticable difference for the price)



I am not a big fan of going with parts that are for hp levels you will never reach.

More people should think like this, I've seen lots of the people have a shit load "supportive" mods running a stock tune and turbines. Besides Fuel pump/injectors, Clutches and MAFS, if it aint broke or failing Ill wait till its actaully pushing its limits. (If you going for tune with a bigger turbine)

I will say that most of the tuners here in my part of Japan 80% of the time stick with 550's on customers street cars when using bolt on turbines.

[Tom N]

It all depends on the price and the tuners ability.

COA A: Are they are going to make you a custom map via street or dyno tune, for what your doing that cool if the price is right.
If you have the money go with 740's incase you upgrade later. It sucks to buy injectors twice.
(I would expect more if they're any good you will notice a significant difference, but don't expect alot of HP on paper)

COA B: Or give you a generic tune for mods XYZ?
In this case I would go with a FPR with the stock injectors, to help you out a bit.
(Unsure of it worth the noticable difference for the price)





More people should think like this, I've seen lots of the people have a shit load "supportive" mods running a stock tune and turbines. Besides Fuel pump/injectors, Clutches and MAFS, if it aint broke or failing Ill wait till its actaully pushing its limits. (If you going for tune with a bigger turbine)

I will say that most of the tuners here in my part of Japan 80% of the time stick with 550's on customers street cars when using bolt on turbines.



It's not a mail order tune. I will be taking the car to Z-Fever where Martin ( Enthalpy Tuning ) will do a rom tune on a dyno.

I am going to talk to him Monday about leaving the stock injectors and doing a low boost tune at like 12ish psi on just pump gas and then a high boost tune where meth injection will be used.

[jamg]

go on ebay, and buy injectors from there.

JECS OEM type that are made in japan.

550's are right at $190 for a set.

but yeah, get an enthalpy tune. they are good. I will be running them- 550, 2871, built head- looking at 350whp at 17psi

[Tom N]

go on ebay, and buy injectors from there.

JECS OEM type that are made in japan.

550's are right at $190 for a set.

but yeah, get an enthalpy tune. they are good. I will be running them- 550, 2871, built head- looking at 350whp at 17psi

Never heard of JECS and I don't think I would trust them. I am not a eBay fan.

[fliprayzin240sx]

JECS make OEM parts for alot of JDM cars, including Nissan. Most of the electronics in your car is made by JECS.

[Tom N]

JECS make OEM parts for alot of JDM cars, including Nissan. Most of the electronics in your car is made by JECS.

So these JECS injectors that are sold on eBay are worth buying?

[jamg]

Correct. JECS is OEM parts that are made in japan. they are great injectors that are affordable.

I have a set of their 550's. They go for under $200.

They come with a 1 year warranty, and they also give you a flow sheet for every injector.

[fliprayzin240sx]

So these JECS injectors that are sold on eBay are worth buying?

Yes and no, all depends on what they are. Some companies like deatschwerks, will basically get stock OEM injectors and modify them to flow more. Its pretty much hit or miss...

[steve shadows]

No. Don't do it. If you do there are only two places I would trust JWT and Enthalpy Scott Avoy. Everyone else gets scammed or the units fail a few months after they get their ecus back.

Get a PFC, save some money up. It's only the MOST IMPORTANT part of your entire car. The thing that runs the engine...

[codyace]

I agree 850's would be all the injector most people aiming at high hp would need. I made 650 hp on my 4g63 with 850's. but like I said. I'm not going over 400 with this car.

850's would be pretty strung out at 650 Whp. Crank is another story.


Get a PFC, save some money up. It's only the MOST IMPORTANT part of your entire car. The thing that runs the engine...

:love:


The day the forum learns about more than Peak Hp, is the day we'll all be happier. A tune is the car's charecter. Who cares about peak HP so long as the mofugga runs. So many kids these days forget that, all chasing that unicorn that is the forum HP crown.

[codyace]

It's not a mail order tune. I will be taking the car to Z-Fever where Martin ( Enthalpy Tuning ) will do a rom tune on a dyno.

I am going to talk to him Monday about leaving the stock injectors and doing a low boost tune at like 12ish psi on just pump gas and then a high boost tune where meth injection will be used.


This sounds like a plan. Martin is a freakin GURU so follow what he says.

[Tom N]

No. Don't do it. If you do there are only two places I would trust JWT and Enthalpy Scott Avoy. Everyone else gets scammed or the units fail a few months after they get their ecus back.

Get a PFC, save some money up. It's only the MOST IMPORTANT part of your entire car. The thing that runs the engine...


As I said I'm not doing a mail in rom tune. I live in Florida by Enthalpy tuning. It will be done on a dyno with me there. Martin is Enthalpy tuning. Scott from secret services/enthalpy tuning stopped doing it years ago to my understanding.

[Tom N]

850's would be pretty strung out at 650 Whp. Crank is another story.



:love:


The day the forum learns about more than Peak Hp, is the day we'll all be happier. A tune is the car's charecter. Who cares about peak HP so long as the mofugga runs. So many kids these days forget that, all chasing that unicorn that is the forum HP crown.



The 650hp on 850's was awhp and I was also using alcohol injection. I tend to forget to mention that.
Power under the curve is what wins races. Not just peak power.

[jamg]

I wanted to get a nistune and pay a tuner to tune my car, but they were so hard to find used.

next best alternative was the enthalpy ECU i have to mail to him. PFC was just out of my budget, even in buying a used one.

[jr_ss]

If you do there are only two places I would trust JWT and Enthalpy Scott Avoy.

Scott from secret services/enthalpy tuning stopped doing it years ago to my understanding.

Scott sold the business/name to Martin quite a few years ago now.

[Tom N]

Scott sold the business/name to Martin quite a few years ago now.

To my understanding Scott pretty much just gave it to him.

[codyace]

The 650hp on 850's was awhp and I was also using alcohol injection. I tend to forget to mention that.
Power under the curve is what wins races. Not just peak power.

That's a pretty big to let out when giving injector advice :cops: :D


So what did Martin say?

[Tom N]

That's a pretty big to let out when giving injector advice :cops: :D


So what did Martin say?

My bad. I sold that car 5 years ago and forgot about the meth injection as I seldom told people about it.:duh:

Martin is on vacation till Monday. Hes on a cruise.

[Tom N]

So to update. I talked to Martin today and he said I do not need bigger than the 480 injectors on the T28 at 17-18 psi which according to him is just before it starts to just blow hot air. He has tuned many sr20`s with 480`s and get 310-320hp out of them with 480`s and stock fpr. Says I just need a z32 maf, fmic, boost controller and a Walbro 255 pump which I have. and my pump is even rewired.
I will be adding a water/meth injection set up for track use and so it can run a little more timing.

[mattsil80wis]

So to update. I talked to Martin today and he said I do not need bigger than the 480 injectors on the T28 at 17-18 psi which according to him is just before it starts to just blow hot air. He has tuned many sr20`s with 480`s and get 310-320hp out of them with 480`s and stock fpr. Says I just need a z32 maf, fmic, boost controller and a Walbro 255 pump which I have. and my pump is even rewired.
I will be adding a water/meth injection set up for track use and so it can run a little more timing.

martin is a great guy...he was a big help in getting my s13 running. i tell everyone to head to either him or JWT for ROM tunes

ps: let me know if you need that maf and boost controller...i have both for sale

[Tom N]

martin is a great guy...he was a big help in getting my s13 running. i tell everyone to head to either him or JWT for ROM tunes

ps: let me know if you need that maf and boost controller...i have both for sale

I do not need either. I already have them.