Is It Worth 1St Tune Your V35?

[Toshi]

You can buy HKS supercharger kit.

Its include piggy back ecu F-CON IS.

[scotty nm35]

Short explanation: Exhausts do not require an ECU tune.

In my time of installing and tuning engine management systems, there has never been a situation which has warranted me altering the maps because of different pipework.

I don't agree, in my situation I changed from a 3 inch to 3.5 inch system and the car leaned out badly. Without a retune or lowering the boost I would have melted pistons. I ended up gaining 35kw from that alone.

I guess NA at almost stock power with the stock o2 feedback it would make very little difference.

[The Max]

Sorry, I should have been more specific and referred to NA systems, though I wouldn't expect a serious difference in the tune as you did in a forced induction situation.

Was the location of the O2 sensor(s) changed? It almost sounds like they wound up on the other side of the catalytic compared to the original set up.

[scotty nm35]

No narrowband sensors in my setup, just the wideband for tuning atm. No need for a cat on ethanol.

[The Max]

So you don't have a wideband O2 sensor as an integral part of your exhaust? You only have it for tuning and then take it out?

[PN-Mad]

Bit of a misconception about the O2 sensors here. The ECU only uses the signal from the O2 sensors to correct fueling in light load areas of the fuel mapping. When you plant your foot down, the O2 sensors are NOT giving feedback to the ECU to change fuel, it is operating off the preset values within the fuel table. Basically, wherever the table says 14.7, the sensors will operate to trim the fuel to achieve that AFR. As soon as you come out of that, its left to the remainder of the table.

Cars from 2004.5 onwards have factory wideband sensors, one in each bank. Prior to that narrowbands were used.

Also notable is on your point of O2s in each cylinder- the factory ECU has the ability to trim or add fuel in individual cylinders, so if you were to set up 6 widebands, you could add fuel to cylinders that receive more air than others due to intake setup.

Scotty get off the net and fix your car brah!

[The Max]

Certainly applicable to OEM engine management systems which do go open loop at WOT but not necessarily so with good aftermarket systems, to within reasonable deviations from the base map of course. If the base fuel map is wildly different from the lambda table, then the ECU will struggle as in its PID closed loop regardless. There has to be a reasonable median for it to be effective.

Edited September 3, 2012 by The Max

[PN-Mad]

Self learning is for pussys. That is all

If only Motecs were more affordable.

[R6n350GT]

In terms of running super charger/turbo on stock engine, lets let the actual facts speak...

http://g35driver.com/forums/forced-induction/162066-stock-motor-forced-induction-how-badly-did-you-push.html

[The Max]

Self learning is for pussys. That is all

If only Motecs were more affordable.

...or easily pluggable. Though I still have many a fond memory of my old M800 in the Maxima after all that time wiring it in. Customised it to the teeth. Even my boost was controlled by it, based on ground speed to minimise wheelspin, torque steer and to minimise the strain on the slushbox. There was nothing I couldn't do with it. Still, it did have the lambda page which meant that it could deviate from the fuel map to a certain degree if it had to - what self-learning ECUs do, fundamentally. That's the beauty of a good aftermarket ECU.

The beauty of an OEM ECU though is that they've gone to a great deal of trouble in their R&D getting the right mapping for the vehicle. So reflashing it to alter the parameters as required is an excellent alternative in my opinion given you maintain the OEM driveability and you've got the perfect base map as your reference.

[Magic]

Uprev is the way to go. Great for either NA and FI VQ35's. I have a Split Second piggyback ECU at the moment but going Uprev once my new built short block on the way from America arrives as my current built motor has pistons and a bore clearance that are more suited for a track car. Uprev reflashes the stock ECU and gets registered with your VIN and ECU serial number. Mine being supercharged it's kind of necessary, but I'd go Uprev if I just had simple bolt ons too. Not sure about over east but for the unit to be registered to your car and dyno tune it'd be around $1000 in WA. The cars are pretty old now so no harm in retuning it.

Edited September 4, 2012 by Magic

[szymonsta]

hmm whats this Uprev thingy?first ive heard of it. is it a replacement ecu? made by who?

interested as my car (also supercharged V35) is running with HKS FconVPro which i am very happy with but its a problem if i ever wanted a re-tune as no one in Adelaide can tune HKS ecu's.

[The Max]

hmm whats this Uprev thingy?first ive heard of it. is it a replacement ecu? made by who?

It's not a replacement ECU. Also known as flash tuners, it's a cable that allows access to the factory/OEM ECU's parameters and gives the user the ability to adjust those parameters, including fuel and ignition maps.

I got one in preparation for possibly supercharging mine, or to at least get a more aggressive tune out of it.

Edited September 6, 2012 by The Max

[PN-Mad]

Tony, make sure you update your software regularly. You might get a little suprise as uprev keep cracking more and more parts of the ecu programming, and add it to the software.

I got a nice suprise when I found out I now can determine the fan switching temp.

If you have FCon, really there is no need for uprev, but IMO it provides good results for far less cost.

[The Max]

Tony, make sure you update your software regularly. You might get a little suprise as uprev keep cracking more and more parts of the ecu programming, and add it to the software.

I got a nice suprise when I found out I now can determine the fan switching temp.

Way ahead of you there. Even though I'm still in London, I've been running the software updater regularly to see what else Jared has introduced to his product. His support has been fantastic and when I sent him a dump of my ECU, he quickly found it was the same codebase as another ECU and sent me the upgrade file within 3 days. That's enough to impress me. As long as I can tune the fuel and ignition maps, I don't really care much for the rest at this point. At least I can actually tune this one, unlike my old Maxima. When I realised I'd have to wire in an aftermarket ECU for its turbo, I figured the only way to do it right was to go balls and all with the MoTeC M800 and then I found myself in hog heaven with all that I could do with it, speed-dependent boost control, etc.

The less hassle the better, hence why I'm trying to avoid all aftermarket ECUs since GTM's forced induction customers are successfully pushing about 400hp out of their cranks using the UpRev Osiris along with upgraded fuel components.

[Magic]

hmm whats this Uprev thingy?first ive heard of it. is it a replacement ecu? made by who?

interested as my car (also supercharged V35) is running with HKS FconVPro which i am very happy with but its a problem if i ever wanted a re-tune as no one in Adelaide can tune HKS ecu's.

You'll probably have the same issue with Uprev unfortunately. According to their website the only authorised Pro Tuner is in WA, TMS who are doing all the work on mine since I bought it at the beginning of the year. http://uprev.com/dealers.php

There may be people in Adelaide that still tune it but they're not official.

[PN-Mad]

Anyone can tune a uprev car. Doesn't have to be a pro tuner. If you have a bit of knowledge, you could do it yourself. I tuned parts of my turbo conversion, but left the power runs to DVS Jez/ unigroup.

The software is comparable to nistune and other tuner software but easier to use. Beats the shit out of emanage. Haven't used Hks yet.

[Magic]

Yeah. I think you can also get a 'generic' tune from Uprev directly if you send them your ECU and car mods/specs too. Just send them an email if you have any questions. They reply pretty quick.

[Nightcrawler]

Any idea on how much it costs for the hardware and software?

[The Max]

You'll probably have the same issue with Uprev unfortunately. According to their website the only authorised Pro Tuner is in WA, TMS who are doing all the work on mine since I bought it at the beginning of the year.

The fundamentals of tuning are still the same. It's a question of what resources the tuner has to do a good job of it. The only benefit I can see in finding an "official" tuner is that they would know the software (and where applicable, hardware) best in that they can work on it probably more efficiently than an unofficial tuner but it's not a dealbreaker by any means.

I'm taking mine in to Tunehouse since I've known Jim from when we attended the MoTeC training seminars back in 2003, he is a fountain of knowledge and experience and he has the Chassispack dyno, which he knows very well and which I'm a big fan of.