Prodeje79

I eventually plan to go turbo. I am not sure when it will be, it could be a year away.

My injectors and FPR need replaced ASAP.

I have a JWT that can be sent in for programming.

I have a MEVI, JWT intake, ypipe, greddy exhaust, UDP, UR FW,etc.

I have the stock fuel pump.

Here is my plan.
I would like to go ahead and get 370 injectors and an adjustable FPR (I am thinking AEM, please interject).
I could then send my ECU to JWT and have it programmed for this? My understanding is that it will learn the new injectors?

My concern is the fuel pump.
Can I get by with the stock pump and have JWT program it accordingly?
Or should I just pay up more and get the (Walboro) fuel pump now?
My main concern with the Walboro is that the previous owner of my ECU got a fuel pump ECU code with his walboro GSS342 255lph. See http://forums.maxima.org/showthread....81#post2464181

[maxi-overdose]

iTrader: (3)

fuel pump - stock fuel pump will pump no more than 50psi. with 370cc....I would say you still need about 65psi of fuel p. during boost.

if you worried that the walbro will give you problem, you can use an inline pump combo with stock pump. Airtex makes a 60 - 70gph (about 250lph) pump and peaked at 125psi. the part no. is E4248.

you can get it thru Carquest.

Prodeje79

Thanks for the reply. I will of course upgrade once I get boost, but I am concerned about the year before I get boost.
any opinons?

[maxi-overdose]

iTrader: (3)

sorry, didnt read your thread completetly.


so if you decided to run 370cc before you got boost. use the adjustable FPR to lower the base fuel pressure to about 28psi. available aftermarket FPRs are AEM and SARD. but I heard SARD is discontiuned in U.S. IIRC. I think you can get by with the stock pump because it is not enough to produce the pressure. Therefore it will not flood your car after you installed the JWT turbo ECU.

IceY2K1

iTrader: (3)

125psi?!?!?

Did that solve your lean issue?

[maxi-overdose]

iTrader: (3)

the new pump is still on my desk. I didnt have time to install it


but....there's something that I didnt tell you guys.

instead of using stillen's relay and fuse to power the fuel pump......the power wire of my inline fuel pump is tapped to the MAF sensor power wire. Chunger told me that MAF 18V source is not suitable for the fuel pump.....I am still checking to see if this will affect the pump's performance.

hope this can end the lean issue.

what do you think.

Stephen Max

iTrader: (59)

You can install the larger injectors first, like maxi says, and use an adjustable fpr to lower your base fuel pressure so that your engine doesn't idle too rich. Several org members have successfully done this, the latest being ejj, I believe. The stock ecu will learn the injectors and you will have normal NA closed loop operation. At WOT, the ecu will revert to open loop operation with premapped injector pulse widths based on rpm and air flow. The stock air-fuel mapping at WOT is based on 240 cc/min injectors, so you may be very rich when you floor it if your engine is not boosted, but you can adjust the afr with an air flow convertor, if you have one. Or you can just not go WOT until you have your ecu programmed by JWT.

JWT's boost program is based on the particular injector size you are using and stock fuel pressure (unless you tell them to base it on a different fuel pressure), so once you install the JWT ecu, you have to adjust the fuel pressure back to 34 psi at idle and 43 psi at WOT. You can run the car like this without any other modification, NA or boosted. JWT can program your ecu based on the Maxima maf, in which case the power is limited to 350 hp, or based on a Z32 maf which is good for 420 hp. If you go with the Z32 maf you have to place it before the blower inlet and run a recirculation hose from your bov to a place in between the maf and the blower inlet. To place the maf before the blower inlet with enough room for a recirc hose in between, you have to do the SCCAI mod and run the maf and air filter in the wheel well.

It is probably a good idea to install a Walbro fuel pump when you install the turbo just to be sure you have sufficient flow. I don't know if the stock fuel pump can supply adequate fuel flow for boosted operation.

IceY2K1

iTrader: (3)

I get nervous when guys start tapping random power wires ESPECIALLY the MAF withOUT a relay! You never tap something critical like the MAF and use it strictly as your power source for some aux device. You can do this if you need it to only be turned on whenever the MAF is being heated, but you MUST use a relay to isolate it. Run a fused power wire DIRECTLY off the battery and use the MAF tap or something better like a rear 02 or any ignition switched device, to switch the relay on/off NOT the fuel pump.

Only reason the MAF should EVER get tapped is for a S-AFC.

It's DEFINITELY NOT a suitable power source, however I don't know if it's causing your problems or not.

[maxi-overdose]

iTrader: (3)

I am going to move this to my new thread.....

http://forums.maxima.org/showthread....39#post2479739

Prodeje79

Thanks!

I am about to order my injectors........

I am searching for the part numbers as we speak :>

[maxi-overdose]

iTrader: (3)

no problem...didnt mean to steal your thread.

hope stephen's info will help you out.

good luck with the turbo project.

Prodeje79

http://forums.maxima.org/showthread....ighlight=370cc

OK so I found the part # for the 370s 16600-21U01 , right?

what all do i need exactly?
The rings? anything else?
16618-10405
16618-10400
16685-10410

thanks again!

edit: Currently for replacing the stock ones I was getting these:
16600-96E01 INjector
16635-53J00 Insulator-Injec
16636-72P00 Insulator
14032-97E00 gasket-manifold

was the dealer not ordering o-rings?

[maxi-overdose]

iTrader: (3)

since I have a 5th gen....I couldnt help you much on the part no. of the Z injectors sorry. I would ask Stephen max or ejj for the part no. I believe Stephen have a set of 370cc for sale.

Stephen Max

iTrader: (59)

They're gone.

As far as o-rings are concerned, study this and you will probably find what you need: courtesy parts page

IceY2K1

iTrader: (3)

Stephen add that to your injector thread!

Should be very useful to anyone buying injectors anyways.

Prodeje79

Can someone please confirm the 370cc part numbers? PLEASE!!!

TT new style injector 95-96 ? 16600-00006?
Then just that lower left colum of o-rings on the courtesy page?


Per JWT, they said my best bet would be to keep a stock FPR and just have my ECU reprogrammed for the 370s running NA for now. Later I could send it back and get it reprogrammed for boost on the 370s and add a fuel pump upgrade.
They do not like to hear the words FMU, AFC, or adjustible FPR.
They insist the stock system is fine. There HAS to be limits to this stock system though. It seems everyone on this org is using FMU, AFC, or adjustible FPR, etc.

Nismo87SE

If you get the ecu reprogrammed U should get the boost program from the start. The engine will run with the boost program while NA no problem however it won't make the same power as the NA program due to different timing/fuel curves. Also consider that on the org outside of a stand alone and JWT the real only other choice is piggyback + fmu for management. If U looked at other nissan's like se-r's, z32s, altimas they usually go to JWT for the fuel management. The stock system isn't that bad but clearly the limits are injectors, fuel pump and MAF, but those can be upgraded. I've read that the z32 maf, 370cc injectors should be good for up to 400whp at 4 bar fuel psi.

Prodeje79

Here is the list, thanks Stephen!

According to the Nissan FAST system,

16600-21U01 is an alternate injector part number for 16600-21u00. Either one should work.

16618-10V05 is the lower o-ring

16618-53J00 is the upper o-ring

16635-53J00 is the upper insulator

16635-88G00 is the lower insulator

That should be everything you need.

JAY25

iTrader: (38)

If your planning on going boosted you can run JW ECU like he said for boost. The car will be fine. Brodaiga was running 370s w/JW ECU NA and his car ran just fine. Once you get your SCer just bolt it right up and dont worry about FMU just drop A walbro and roll out and go play!

Prodeje79

thanks jay and everyone!

So I will send out my ECU and get the boost program for the 370s.

Will there be any drawbacks running the boost program while my car is NA for awhile such as loss in MPG, running too rich, etc?

Does JWT need to program anything to use the z32 MAF?

I currently have the 7200rpm limit, should I lower it down?

slimer

iTrader: (13)

how can you have a 97 and send jwt the ecu? you would have to get a 96 ecu first, wouldnt you?

Prodeje79

I have a 96 JWT ecu from Allgo's 1998 I30t :

http://forums.maxima.org/showthread.php?t=245591

slimer

iTrader: (13)

do you get a cel or did you rewire the harness

JeffesonM

iTrader: (5)

Just a suggestion that maybe someone more knowledgable can confirm, but could he also use a stock ECU while NA, given that the 370cc injectors will be offset by the Z32 MAF (Interesting Discovery)? And if it worked, would it be any better or worse than the JWT?

Prodeje79

OK I got my 370 injectors, SARD FPR, knock sensor, and MEVI installed now.
The o-rings were the wrong ones, I think I needed the maxima o-rings and not the z32? oh well.
I just set the harlan for 5300rpms switchover, I could not remember the ideal setting and it is not in the MEVI instructions I had printed out.

My JWT ecu is still in Cali so I am using my stock ecu.

I am also NOT currently boosting and am on the stock fuel pump. I have a Walbro ready to install though.

I did not have a fuel pressure gauge, but I will have one tomorrow to do my final tweaking.

So for question.........

I need to attach my fp gauge, turn the car on and set the fpr to 28psi?

EDIT: I know the stock fp is 34 at idle and WOT is 43.5 .

I could use a little more feedback on how to do this and what psi to use. JWT said to use 43.5 psi though.

What can happen if I go WOT on my current setup with the base FP lowered?

EDIT2:
OK the Walbro 342 is going in now.
I do not feel comfortable lowering the FP below what the manual calls for.
Haynes says with key in ,but car not on, it should be the 43 psi and at idle running about 34psi.
I will not have my electronic gauges in to monitor issues for a week at least.

So I guess I will be running rich, getting bad mpg, and toasting my o2s and cat? :>

Please convince me it is safe to lower the fp.

Stephen Max

iTrader: (59)

You can run the 370 cc/min injectors with an A32 maf and oem ecu if you lower the fuel pressure to about 26-28 psi at idle. This should get the fuel pressure within the range needed by the ecu for closed loop operation. If you don't lower the fuel pressure, then the larger than oem injectors will deliver too much fuel and you will be way too rich, as you suspect.

[maxi-overdose]

iTrader: (3)

It is safe for low end. As long as your fp raising along the rpm, you should be fine. Plus, you already have a new injector flow rate of 370cc.....you should get enough fuel delivery with lowered FP.

if you running higher fuel pressure with 370cc, your low end might bog a little. You should see your mpg drops more if you do more local driving. cruising on freeway wouldnt change much. I used to run my car with the vacuum hose on the FPR disconnected so I can get more base (~50psi base) and boosted fuel pressure. The low end definitly bogged a little.

btw, your electronic fuel pressure gauge should be there on Wednesday or Thursday.

Prodeje79

Thanks for the replies!

My borrowed mech FP gauge is now gone.

The Walbro is in.

We lowered the FP to the stock 34/43. I did not read these in time, oh well!

I do not want to turn that screw without a FP gauge.

I will do some more tweaking once I get that stuff Maxi! hehe

To do list is now: to do a compression test
install gauges
obtain z32 MAF and intake & crossover piping
install SC!

YEAH!