My understanding is that Haltech Platinum running on a 2003/2004 Z should be able to set the max RPM, anything post this will require a flash. I know others that have bumped the RPM limit without flashing the oem ECU with Osiris.

I tested the the RPM limit by setting it to 4000 rpm and works fine however when set to 7500 it peaks at factory ~6800rpm

Any ideas why it works on some 2003's and not others?

 

no idea. Hal told me it should work fine on all of them when i asked about doing a flash to up my rev limit. He said not needed and mine works fine. Set the rpm max to whatever i want in haltech and it's golden.

i thought factory on non-rev's is 6600, not 6800

 

every 350 running haltech requires a reflash to bump the rev limiter. the haltech rev limiter is a secondary rev limiter. its a "in addition to" not a "replaces" the only one that can bump the stock rev limit without a reflash is proefi if you have it take over control of the throttle body(well mayby vipec? idk only one person using it that i know of and hes going ls now lol)

edit im not sure how hat happened with you binder i was told i needed the reflash right before i deployed if i wanted to set my rev limit to 8k and that was by several vendors, actually a primary reason im going with the proefi since letting it control the throttlebody will bypass the stock rev limit and stock speed limiter

 

Are you using the fuel cut? or ignition?

 

2003 and early 2004 use fuel cut. 2004.5 and up use DBW.

 

interesting mid, might have to have another talk with jason at proefi he even asked me the year of my z and told me that it would be able to bypass everything by controlling the throttle body, i would like the haltech with the racepak dash but dint wanna spend the extra cash for a reflash. of course hal told me to over the phone when i first talked to him i would need a reflash to bump the rpm limit and speed limiter even with the haltech. now im just confused

 

hal installed my haltech and tuned my car twice. He was the one that told me i didn't need a reflash to up the rev limit. Unfortunately the car wouldn't idle right until about 1000 rpm so we ended up having to flash for an idle increase since the cipher can only raise it to 900. Still didn't mess with my oem rev limit though.

 

I have a 2004.5 and I am pretty sure I have a fuel cut (not a soft TB cut) for the stock rev limiter. That said, I also have reflashed the stock rev limiter to 8k rpms so I am not sure 100%. I seem to recall that the UTEC was able to raise the rev limiter for me without a reflash...

 

Anyone that I know with a 2003 and was able to bump the RPM limit is using the red box haltech platinum. Is there anyone that has got this to work with the silver box?

binder i was just going by the graph. I assume it was just bouncing hence the higher cut out logged on the graph.

midz350 i'm using fuel cut.

 

ah, ya, 6600 cut and it bounced to 6800.

There is zero difference in internals from the red or the silver haltech. They just changed the case.

I have a silver haltech.

 

my last dyno pull with my haltech was to 8000 rpms, so ya, no problems with teh rev limiters on a non-rev up

 

I have a silver haltech n Hal had to flash the ecu to raise mine... I've since played around with different things n tried to raise it higher with the haltech but nothing happens.... I also have a 2003.... Revving to 6800+/-

 

^^^ So hal raised yours to 6800? It seems odd if Hal had to raise it with a flash for you but flashed it to 6800. Would of thought he would flash it to 8000 and let the haltech limit it to 6800. Means you only would need to flash it once?

 

We handle this on a case by case basis due to the variances in vehicles... the early Z's (most 03 and early 04s) only cut fuel and do not cut throttle. Since Haltech has complete control of fuel, you can set the rev limit to whatever you like. Newer vehicles have both fuel cut and throttle cut, and since the stock ecu is in control of the throttle, they need a reflash to increase/remove the stock throttle-cut-rev-limit.

This goes for red and silver boxes.

MR RIZK, show a log of rpm, injector 1 output, and throttle position. Assuming throttle is closing, then you need a reflash. This may be due to having a non US spec Z, and Nissan could have implemented throttle cut earlier on yours.

 

Hal, When you say inj output I assume Inj 1 Time. Below is the log from post 1.

Agree it is on case by case basis however I was just going by some of the local AU owners that have got this to work on their 2003's.

Is the below what you are after?

 

A quick update. Purchased the Osiris software and flashed the ecu. Now the limit is about 7200. Still though based on the above input from hal and graphs i would of thought the haltech would do it for me.

 

^ Must be an international difference in OEM-ecu rev limiting strategies.

 

I remember my 04 AT 350z would do burnouts and the ECU won't cut power while pressing the gas pedal and brake pedal at the same time and its speed limited to 151mph , but my 08 won't do it stock and is speed limited to 160mph. My 350z isn't an USDM.