Just spoke to JWT, and am considering using them to flash my stock 1996 ECU.

Going with the 300Z MAF, and need to change the injectors. So far I am told I need "top feed" because it is a VQ35 fuel rail. I have already converted it to a return system.

JWT wanted to sell me a "drop in replacement" 410 injector (I think that is what he said) for $125 each. Kind of expensive considering what I see injectors go for from other vendors.

Does anyone have a suggestion on what injector to go with, such that JWT can give me the correct program?

Thanks.

 

Brand or size? Size will depend on your boost levels and power expectations.

 

precisely.

 

give me a PM , i sell injectors for whatever App you need

 

JWT suggested a 410 injector. I am looking to get about 400HP, so I imagine anything in that general range would be OK.

Like I said, I'd love to find some more common "off the shelf" injector that they can tune the ECU for.

 

You could get injectors from a for sale thread on my350z.com, those guys upgrade injectors sometimes, then tell jwt what you got.

 

Get a set of deatschwerks vq35 top feeds, you could get either their 380s or 440s. no way you should pay the exorbitant price JWT wanted for injectors. $125 a piece is a joke.

 

+1 for the deatschwerks... good stuff, and go with the 440s if you want 400 hp's

 

already PMed you

 

The stock 350z injectors will work? What is the flow rate on those? Or, are you saying the 350z guys upgrade from one after market to another?


Thanks for this information. I saw a number of deatschwerks injectors when I did my searches. Looks like a number of people have used them on the VQ35, but it looks like I have to change the connectors? Not a big deal, just asking.

 

No, you don't have to change the connectors if you are using VQ35 injector wiring harness already which I assume you are since you said you already have a top feed fuel rail. DWs whole business model is built upon not having to change anything, their injectors drop right in unlike some other brands (namely RC).

What he's saying is that a lot of 350Z guys upgrade from 440s when they have their basic turbo setups to much larger injectors when the build their motor, turn up the boost, etc. So there are a lot of 350Z 440(ish)cc aftermarket injectors available out there. Stock 350Z injectors are too small for the power you want.

 

I agree, go over to the 350z forums. I got my RC440s for really cheap, i think like 200 shipped. Then later on I got DW600 for cheap too, 250 for those.

$125 per injectors($750), thats insane. ****, you can get brand new forged Pistons for cheaper lol.

 

Sounds like Deatschwerks 440 injectors are the way to go, with the RC440s a good alternative..

 

IN a related topic, will the Z32 MAF plug in to my VQ30 harness?? Or, do I need to modify that connector too??

 

good question..... im just finished my 00VI, 2.87 pulley and now about to do E mange... i have DeatschWerk 600cc VQ30de-k injectors... and i heard tha with tunning i will be turning down the injector pulse, so tha i might me able to still use my stock MAF.... anyone know if this is tru?


NOT TRYING TO JACK YOUR THREAD!!!

 

Just get the z32 and call it a day. You can tune down the maf but it will take a little trickery, clamping if you are up to it. z32 maf you need the pigtail to splice into our harness since the connectors are different.

 

The stock maxima maf will not be able to meter air above about 300 hp. it doesnt matter what size injectors you have. This means that at the airflow required to make 300 hp... the maf is putting out around 5.1 volts to the computer, and 5.1 is the highest voltage that the computer can recognize.

 

JWT is telling me DW injectors are drilled, and they have had problems with them. As an alternative, they have 555 injectors but those need new connectors (not the end of the world).

I am not sure if JWT is giving me a line so I buy their stuff, but I am not comfortable with the fact that they wont give me any details on their injectors. Like, who makes them? For all I know, their injectors are RC450's drilled out!

Any advice?

 

Hes just feeding you a line, Ive never heard good things about JWT as a company. They have some great products but everything i have ever heard about the people that run it has not been great. There are ALOT of credible companies that use DW injectors.. AMS being one. Ive been using there Top feed style injectors for 4 years now and there still GREAT.

 

I guess I am sorta stuck with JWT for flashing the ECU. I can't find anyone else that does it, and they are pushing hard for me to use their injectors.

again, it would not be so awful if they told me what they were! the 555 injectors are not that outrageous (price wise), but what are they?

Also don't want to be in a situation where they don't support me because I did not use their injectors.

I guess they conduct themselves in this manor because they can! They seem to be the only game in town.

 

I dont understand, mostly everybody here who did go with a JWT ecu at one timesimply called and said program the ECU for ##cc inj, Z32 MAF and etc. I dont see what the problem is. Of course they are going to suggest you buy the inj from them, but i dont see why you "have" to.
If you dont want to go with a flashed ECU, you can do a Piggy back which is a better way to go really.

 

Why is that better?

 

As said, they make some good products, but they have no problem throwing better products under the bus to make their buck off of you. DW injectors have taken the injector industry by storm over the last 5 years or so, and RC (who is in league with JWT) and Power Enterprise are scrambling to use whatever methods necessary to stem the bleeding that the tighter tolerances and superior quality control methods of that DW injectors use have caused to their business.

Call DW and talk to them about injectors, don't ask the competition (JWT/RC) about DW injectors, ask the company that manufactures them.

 

Because JWT's forced induction maxima tunes are utterly terrible, that's why.

 

You can get whatever injectors you want and send them in so they confirm the flow rates. Or you can do what I did and tell them your going to buy nismo or rc injectors and just buy whatever you want.

JWT doesn't like DW injectors cause back in the day they would reuse cores and drill them out and there was a problem with the injector flow rates matching as a set but this is no longer a problem.

JWT loves nismo since they are factory and the spec's are normally spot on not sure why they like rc's but they do and will not question you if you say that's what your going with.

BTW, if you think they are giving you crap about injectors should have heard them when I asked for a additional 10 degree's of timing

 

It will allow you to get the most power out of your setup by giving you the abilty to actually tune it.
The JWT is simply a plug and play setup and their tunes a very conservative.

 

No, DW injector flow rates have always been matched to the tightest tolerances in the industry, always match to within 2%. That was not the problem. The 'problem' was that JWT wasn't used to tuning for OEM injector latency times at high flow rates (which DW injectors had since they were rebuilt from OEM coils), they were used to Nismo latency times, which are different from regular OEM latency times, so they had problems with idle and low IDC tuning. A simple thing that JWT could have tuned for, but their general apathy and unwillingness to go beyond the most basic crap tunes is why they had problems running DW injectors at low duty cycles. At high duty cycles (where latency/lag time makes little difference) the DW injectors worked fine. It was drivability that suffered because JWT was lazy and didn't bother to tune for it. They wanted to make their $600 in the easiest and quickest way possible.

Don't go saying that DW injector flow rate matching was a problem because proper injector flow rate matching has always been DW's strong suit. JWT's inability/unwillingness to tune for different lag times (particularly between DW 550s and Nismo 555s) was a problem back in the day. So many guys use DW injectors nowadays that JWT had no choice but to stop being lazy and actually develop a tune for DW 550s, so it's no longer an issue.

 

your opinion sounds alittle basis, I have no problem with DW injectors. Hell I just ordered some today but you don't think redrilling old cores had anything to it. Cause when I had my ecu reflashed the only thing they asked is that a 2nd party flow test them but I did not feel like shipping them to JWT or someone else since there is no shops local that will do it.

 

One reason is that company has roots in this forum and has been good to this forum. i believe they still do maxima.org discounts. Mike D was one of the members that helped me with my turbo setup information wise and his turbo i30 was an inspiriation to get my setup running. I had some injectors flow tested and they had good quality and customer service. Redrilliing old cores wasn't a big deal to me since years ago finding a high flowing set of injectors at a decent price was an issue. Deatschwerks was the place and still is to find injectors for our setups that's the reason we promote them.

 

I guess my concern is, if I go with the DW or RC, or any other injector that is not officially endorsed by JWT, they will for sure blame the injectors for any problems I have..

IIRC, the 555 injectors from JWT is only $60 or so more than the DW's. Other than having to splice in new connectors, is there any other disadvantage to the 555's? I think $60 is well spent if it gives me a single entity to call if there is a problem with the setup.

 

You also have to consider at what fuel pressure they are saying its 555cc. I have never dealt with JWT and never will, like mentioned above a piggy back will be more beneficial to you (unless you are absolutely cluseless on how to tune yourself). Dont know if money is an issue to you but, I would get an EU over a fixed ECU that requiers $100-$200 everytime you make a big change to your setup and have to get it retuned (with another crappy tune). EU you will save you money, have way more features and flexibility. Then buy any injectors you want.

 

Clark leaves room for you to tune , thats why there program is always rich.

I have no knowledge on the JWT maxima program

But in 97-2000 I sent my ECU back to Clark 4 times on a 1994 Nissan Altima KA-T

No matter how many times I sent it back

( 370cc )
(550 ccs cobra maf )

The car would run fat rich, some tuners tune to the edge and leaves no room for mistakes.
thus why JWTs ecu programs run rich as they are.

 

This is why I can supply you with plug and play instead of going with clips or cutting and splicing,

Some people take short cuts and dont properly solder and heat shrink the wires.
Also Ive seen people wire them backwards as well.

have you made a decesion on what size you want to go with ? if you do I can give you a good price on brand new injectors for your setup.

 

Yep they sure will or you can buy whatever you want and send them to JWT so they can test them. I would do whatever whatever gives you peace of mind. Last thing you want is a bunch of woulda, coulda, shoulda's running around in the back of your head.

BTW, ask for a 100 octane tune, JTW timing map is a joke

 

Right now I don't have the means, or the confidence to "tune it myself", which is why I am willing to pay JWT to give me something that (for the most part) will be plug and play.

Yes, I get that if I tune it myself on a dyno I can get a better tune.. But, what are we talking about? and extra 10HP? even 20? I am not building a car to race, just one to enjoy so squeezing every bit of power out of it is not a big concern.

 

But why pay the 5-600 just to have to go back and fine tune it yourself?



Then why be concerend about hitting the 400hp mark? If the car makes 360whp would you be just as happy?
I used a JWT ecu for a while and it was nice just to be able to turn the key and go. But it killed me knowing that the car could make more power if the abiltiy to tune was there. After all the money invested in a boosted setup, doesnt make sense to me not get the most out of it.

 

I agree, and expect that at some point in the future I would go back and do something with a full replacement ECU. Maybe even MegaSquirt, but for now I just want to get the car running again. Summer is here, and the show season has started.

With that in mind.....

Is it a good compromise to go with the JWT ecu and their 555 injectors?

 

FYI, I only paid 480shipped for my DW 600cc injectors new