How come no body has tried using a 300zx twin turbo MAF or a skyline maf sensor? Does it not work or has no one tried? Just a question i was pondering.:D :confused:

Andreas has suggested it in the past many times. The best I can make of it is that it is cost prohibitive. Though I doubt a used one can cost that much.

cause the mustange one is cheaper than the skyline one. But I ant no engineer so I couldnt tell you.

Though I just looked up on car-parts.com You can find both 300zx and q45 mafs for as little as $50 or so. So the next question is, are they both a direct plug into the stock harness or do you have to modify it to work. It seems like you can save a lot of money buy going with those mafs instead of a cobra maf which will cost you around $200 or less, plus the $90 jwt subtractor program for your ecu.

Originally posted by david
Though I just looked up on car-parts.com You can find both 300zx and q45 mafs for as little as $50 or so. So the next question is, are they both a direct plug into the stock harness or do you have to modify it to work. It seems like you can save a lot of money buy going with those mafs instead of a cobra maf which will cost you around $200 or less, plus the $90 jwt subtractor program for your ecu.

That is exactly what i am saying, but does anyone have any objections to using these maf sensors

Get the 300ZX MAF 90-96. This MAF will be the end all. No subtracter program. 550 HP readable limit 99.9% of you will never get there. It is a Nissan part, keep it original. You will have to get the harness with it so ask the junkyard guy to cut the harness for MAF about 8 inchs away from MAF and send it. I have used the 300zx MAF many times it works great. It wires up just like a Cobra MAF it has 2 grounds that you join together on power wore and one read wire easy as cake to wire in.

Have you taken A/F readings with the 300zx MAF in place?

The reason I ask is this. MAF units are all mapped according to airflow. In other words a 60mm MAF will have a chart that says at X voltage we have Y airflow, where a 75mm MAF at the same voltage will have MUCH more airflow.

The ECU takes that "map" into account when it calculates fuel and timing. It thinks at X voltage Y air is entering the motor.

Sounds to me that a larger MAF with the same voltage output would cause a lean condition.

Wolf does more than stick a subtractor in the ECU. The remap the fuel and spark tables to deal with the new airflow.

right Jay, but you are already sending your ecu to JWT to get reprogrammed so you are telling them you have a 300zx maf anyway. they are remapping the ecu for that.

Couple of other questions about it.

What is the maf size? 3 inch? other?

Have you ever had any problems with yards not wanting to cut the harness? If so can you simply buy the connector or short harness piece from a dealer?

Originally posted by david
right Jay, but you are already sending your ecu to JWT to get reprogrammed so you are telling them you have a 300zx maf anyway. they are remapping the ecu for that.

Couple of other questions about it.

What is the maf size? 3 inch? other?



Who told you JWT can do that MAF? Did JWT say that? I'm not saying your wrong, but from my understanding it's Cobra MAF or nothing for the SE-R.

Andreas has mentioned it in the past in a few threads on here. He has mentioned using a bored stock or gtir maf (bored or unbored), a 300zx maf and q45 maf. They are all good up to certain hp levels.

Here is a very good post about it with some very useful info posted by Andreas

http://www.sr20deforum.com/showthread.php?s=&threadid=10615&

Okay I still don't see an answer.

Has anyone called JWT and asked "Hey will you map the ECU for a Z MAF?" ***'ts my question.

That's my concern. I know JWT can do just about anything, but they don't always offer it to the public. Building a 450hp SE-R like I did, you learn that many of the "trick" items, is one off or they won't do it for the average "joe".

In regards to 4bar vs 2.5bar discussed, that's a whole other issue. The 72lb injectors are a different impedance, and larger injectors are not as streetable as a smaller injectors so at the time they raised the FP to 4bar to compensate for the 50lb injectors.

i will call jwt ,but if i am not mistaken reading an older importtuner mag they used 300zx maf sensors to upgrade a project skyline because the skyline mafs were maxed out. So thre is no doubt about the flow rate. Also i would think itwould be easier to program for a nissan component rather than using a different manufacturers component and adapt it. It shouldn't be that hard because they program 300sx ecu's, but i might just be stupid:D

Originally posted by camoser
i will call jwt ,but if i am not mistaken reading an older importtuner mag they used 300zx maf sensors to upgrade a project skyline because the skyline mafs were maxed out. So thre is no doubt about the flow rate. Also i would think itwould be easier to program for a nissan component rather than using a different manufacturers component and adapt it. It shouldn't be that hard because they program 300sx ecu's, but i might just be stupid:D

Please do call. Like I said, I'm not saying they don't but they also do a lot of one off work.

In regards to manufacturer specific MAF's. All companies source outside for those parts. The Cobra MAF is actually made in Japan, so it really doesn't matter about the name brand of the car it came from. I would think though that since JWT programs for Z cars, they would have a handle on the maps for the MAF.

well, the ttz guys start to top out around 425-450 hp, so that might be another reason they recommend to go with the cobra, because they know that they will have a hard time topping it out.

Jay Hass...the AF meter everyone runs is run off your O2 sensor, right? But a regular O2 sensor cannot read WOT conditions making it's readings at WOT absolutely useless. Am I right? I know a regular O2 is useless at WOT because my friend just bought a wide band set up because of this (he couldn't tune his TEC II without it).

No at WOT the O2 sensor works, but no matter where the throttle is they are not accurate. They vary with exhaust temp in a pretty wide range.

Widband is the best way to tune with an O2

On a stock set up , the computer only uses the O2 signal at steady state driving (closed loop) the computer ignores the input signal of the O2 on decel, accel and wot. the o2 is only there to fine tune the fuel air mix. the tps and mass air flow and coolant temp sensor are used for the bulk of the injector pulse width.

Did somebody figure this out? I don't want to waste a long distance phone call and waste their time answering it just to get resolution on a simple question...

Brian TT 300ZX start to top out 420 HP not becauxe of the MAF but because of the 370cc inj X 6 which gives you about 95% duty cycle. The reason 300zx guys go with a 300zx MAF on one side and a dummy MAF on the other side is because the Y bracket that splits behind the MAF causes a restriction and once they go with bigger turbos and 555cc injs they will top out the MAF quickly. This dummy MAF on one side setup takes the reading from the MAF and multipies the fuel by 2 because they are using one turbo to pull through the MAF.

Jay Hass I have sold may 555cc programs with 300zx MAF for the SE-R. You might be right that some people might not be able to get them but if some one wanted it, I could get it for them.

JWT does offer programs with the Z32 MAF. My friend with a stock Bluebird setup just upgraded to 50 lb MSD injectors and a Z32 MAF. No problems at all.

Another friend just sent his ECU in for a GTi-R program (444cc injectors) and a Z32 MAF.

JWT does it. For sure.