Link G4 Plug-In Vs Vipec V44 Plug-In

[DVS JEZ]

I tried auto tune on my GTR with link. Issue i had is the variation between dyno afr and my innovate's afr. So i found it easier to just tune on dyno as i normally do.

With this however the innovate was in the tailpipe which wouldnt be helping. I will put a bung in the dump pipe and retry when my new tur bro arrives

[Hanaldo]

What's your overall opinion on the Link, Jez? I ordered and paid for mine on Friday, fingers crossed it solves my problems.

[DVS JEZ]

Love it. Made me think a little when i had to set up a 4D fuel map. Is very nice to use

[WMDC35]

I just got g4, am putting in IAT sensor etc this week so hopefully should have some results soon!

[discopotato03]

So I gather no one sticks with a mass air flow meter like a Z32 ?

I did ask Scott at Insight a couple of years back about Vipecs and MAF sensors and he said all good . I just like the idea of an air flow measuring device that takes temperature into the equation and spits out one I think 0-5v signal . I was never happy with trying to factor in air temp sensor compensations and map sensors when trying to play with early Haltechs and an SM4 .

I think MAP sensors are the go when regulating boost pressure but personally I was never happiy using manifold pressure for primary load sensing .

If I end up with one of hese plug ins it will use my Z32 MAF meter .

Just my thoughts , cheers A .

[Piggaz]

Too much thinking about it/text book maybe? I'd never go back to a AFM based ECU again.

[scotty nm35]

Pop a cooler hose and just drive home like a boss, not laying on the road under the car wondering why you were running 30psi anyway...

[discopotato03]

I just think on a single turbo car its easy and if you have a Z32 already these plug ins are literally plug and play . I'm not so sure a Z32 is a major restriction and if it was the V8 one shoudn't be .

If I remember correctly these Vipec/Links are set up as a throttle position signal load sensing with either a MAP or MAF correction table ?

Just as a point of interest years ago I ran my Autronic SMC on the old FJ20 with the air temp sensor in the manifold , throttlebody actually but after several of them died I was told to put it in the plumbing just short of the throttlebody . It sort of made sense here because it was measuring air temp upstream of the TB so probably closer to ambient , well post intercooler anyway . I noticed Guilt Toy has his in the plumbing rather than the inlet manifold .

A .

[RRob]

ITB's like on the RB26 is the only time you really need 4D tuning. Single throttle bodied engines don't usually need this.

[WMDC35]

So I gather no one sticks with a mass air flow meter like a Z32 ?

I did ask Scott at Insight a couple of years back about Vipecs and MAF sensors and he said all good . I just like the idea of an air flow measuring device that takes temperature into the equation and spits out one I think 0-5v signal . I was never happy with trying to factor in air temp sensor compensations and map sensors when trying to play with early Haltechs and an SM4 .

I think MAP sensors are the go when regulating boost pressure but personally I was never happiy using manifold pressure for primary load sensing .

If I end up with one of hese plug ins it will use my Z32 MAF meter .

Just my thoughts , cheers A .

i gained mid range response removing z32 afm and using link g4, looked all pretty similar on dyno but feels alot better to drive

(IAT sensor in plumbing)

Edited September 1, 2012 by WMDC35

[rob82]

So I gather no one sticks with a mass air flow meter like a Z32 ?

I did ask Scott at Insight a couple of years back about Vipecs and MAF sensors and he said all good . I just like the idea of an air flow measuring device that takes temperature into the equation and spits out one I think 0-5v signal . I was never happy with trying to factor in air temp sensor compensations and map sensors when trying to play with early Haltechs and an SM4 .

I think MAP sensors are the go when regulating boost pressure but personally I was never happiy using manifold pressure for primary load sensing .

If I end up with one of hese plug ins it will use my Z32 MAF meter .

Just my thoughts , cheers A .

The sm4 has a charge temp estimate table. Plus you enter compression ratio so it can work out charge temp after compression. What other ecu has that.

And as for 4d tuning its a snack when you have a ve equation.

I tuned an ls1 that was in a plane with individual throttle bodies and medium size cam (238@50 square) So I was tuning in 5d if you factor in baro compensation. That was fun......

[discopotato03]

Yeah well thats what used to make me wonder - estimation . How the hell can they estimate every different conceivable engine combinations charge temperature ? Sure for type approval a manufacturer can probably afford the test gear to know what a mass produced engines charge temps will be .

A mass (measuring air by weight) flow meter tells the computer whats on the way in and knows its densityand therefore temperature . To me its reasonably simple in that if you know how much air is being injested its not hard to inject a suitable amount of fuel to come up with workabe air fuel ratios .

With a MAP sensor system theres more crunching going on and you want to be sure that the constantly changing air pressures/temperatures/density can be accurately measure by a pressure and a temperature sensor and processed to give a reliable and accurate load signal .

In the recent past most but not all production engines including performance engines ran some form of mass flow meter and to get todays emissions and consumption results the system must work pretty well .

Just my thoughts , cheers A .

[old grant]

Hi guys,

there seems to be lots of confusion over the plugin Link and Vi-pec Nissan ecu's. They are made by the same company-true. Are they the same? No they are very different on the Nissan plugin board. The Vi-pec has a 4 bar inbuilt map sensor. The Vi-pec has an ignition output channel for each cylinder, the Link runs wasted spark. The Vi-pec has built in individual cylinder knock control. The Link needs an external knock unit and then can only retard 2 cylinders at once due to the wasted spark. The Vi-pec has more outputs than the Link. The Vi-pec comes with a high speed air temp sensor. The tuning software on the Vi-pec has one very important feature called the MIXTURE MAP table which makes tuning on the track or road very easy which the Link does not. This works by setting your a/f targets in the open loop table, then setting the fuel numbers so the engine runs richer/safer than you want to end up with, drive the car around on the track, road or run up on the dyno. Go to the mixture map page and the fuel sites that the engine has been into will come up on the page telling you what your target a/f ratio is, your actual a/f ratio, how many times it has looked at the a/f ratio. For example at 5000 rpm and 1.5 bar boost your target may be 12/1 (it could be anything the tuner wants the target to be you just put it in the target table - 11/1-13/1 whatever ) so say the actual comes up as 10.5/1 all you do is double click on the box and it will change the number in the main fuel table to suit the target 12/1. This is really useful when tuning high horsepower cars on the dyno where holding 2 bar of boost at 7500 rpm for very long is really hard on everything. If I am wrong on anything written here please tell me. These are the reason why the Vi-pec is more expensive than the Link. Cheers, Grant.

Edited June 4, 2013 by old grant

[discopotato03]

Dredging up old thoughts , well mine uses MAP sensing and while its working better than I thought it would I can't quite get the fuel consumption I had with MAF/PFC . All thats changed aside from the board is the intercooler which is a Blits rtn frow instead of the GTt one . My guess is that the MAF signal works out a little better right where you go into positive pressure and have to ensure the mixture doesn't lean at that point .

My IAT sensor is in the back of the factory crossover pipe and shows some reasonably high temps (high 40s) when idling for a while . I have to wonder if the temp of the pipe affects things here .

I must ask Scott if there are any inputs unused so a MAF signal can at least be viewed

A .

[Lithium]

Hi guys,

there seems to be lots of confusion over the plugin Link and Vi-pec Nissan ecu's. They are made by the same company-true. Are they the same? No they are very different on the Nissan plugin board. The Vi-pec has a 4 bar inbuilt map sensor. The Vi-pec has an ignition output channel for each cylinder, the Link runs wasted spark. The Vi-pec has built in individual cylinder knock control. The Link needs an external knock unit and then can only retard 2 cylinders at once due to the wasted spark. The Vi-pec has more outputs than the Link. The Vi-pec comes with a high speed air temp sensor. The tuning software on the Vi-pec has one very important feature called the MIXTURE MAP table which makes tuning on the track or road very easy which the Link does not. This works by setting your a/f targets in the open loop table, then setting the fuel numbers so the engine runs richer/safer than you want to end up with, drive the car around on the track, road or run up on the dyno. Go to the mixture map page and the fuel sites that the engine has been into will come up on the page telling you what your target a/f ratio is, your actual a/f ratio, how many times it has looked at the a/f ratio. For example at 5000 rpm and 1.5 bar boost your target may be 12/1 (it could be anything the tuner wants the target to be you just put it in the target table - 11/1-13/1 whatever ) so say the actual comes up as 10.5/1 all you do is double click on the box and it will change the number in the main fuel table to suit the target 12/1. This is really useful when tuning high horsepower cars on the dyno where holding 2 bar of boost at 7500 rpm for very long is really hard on everything. If I am wrong on anything written here please tell me. These are the reason why the Vi-pec is more expensive than the Link. Cheers, Grant.

Hmm - I've been making a little collection of spreadsheets/apps for myself to make tuning a bit easier, and been pondering what else might help... I have no idea why I never thought of making a background app which could open an LLG file and map out the mean AFRs for load cells hit in a logging session for a Link - given none of the guys I know use ViPECs. That isn't QUITE as good as clicking a cell and having the map adjust itself, but with the quick trim feature the Link does have it will be close enough, and should only take a couple hours to build. If you have set up the AFR target table quick trim will bring up a suggested AFR target so you don't have to head scratch too much.

Thanks for the idea

[Guilt-Toy]

the new plugin vipec with the v88 top board is indeed different, but for many years the plug ins were the same.

[Joshbigt62r]

How can you tell if you have a v88 top board version or a old version?

[old grant]

Hi guys, you can use the maths key on the log file with the Link-its a lot slower than the Mixture map but does the same job. Cheers, Grant.

[SimonR32]

Hi guys,

there seems to be lots of confusion over the plugin Link and Vi-pec Nissan ecu's. They are made by the same company-true. Are they the same? No they are very different on the Nissan plugin board. The Vi-pec has a 4 bar inbuilt map sensor. The Vi-pec has an ignition output channel for each cylinder, the Link runs wasted spark. The Vi-pec has built in individual cylinder knock control. The Link needs an external knock unit and then can only retard 2 cylinders at once due to the wasted spark. The Vi-pec has more outputs than the Link. The Vi-pec comes with a high speed air temp sensor. The tuning software on the Vi-pec has one very important feature called the MIXTURE MAP table which makes tuning on the track or road very easy which the Link does not. This works by setting your a/f targets in the open loop table, then setting the fuel numbers so the engine runs richer/safer than you want to end up with, drive the car around on the track, road or run up on the dyno. Go to the mixture map page and the fuel sites that the engine has been into will come up on the page telling you what your target a/f ratio is, your actual a/f ratio, how many times it has looked at the a/f ratio. For example at 5000 rpm and 1.5 bar boost your target may be 12/1 (it could be anything the tuner wants the target to be you just put it in the target table - 11/1-13/1 whatever ) so say the actual comes up as 10.5/1 all you do is double click on the box and it will change the number in the main fuel table to suit the target 12/1. This is really useful when tuning high horsepower cars on the dyno where holding 2 bar of boost at 7500 rpm for very long is really hard on everything. If I am wrong on anything written here please tell me. These are the reason why the Vi-pec is more expensive than the Link. Cheers, Grant.

That is very interesting... We use the closed loop lambda control but have never used the MIXTURE MAP before.

I have been playing with some my logs vs my current tune over the last few hours to test it out and it actually seems like a very clever idea. Sometimes it's popping up numbers on the fuel that seem to a tad high or low but that's without actually testing. Have you found that the numbers are spot on after a "double click" or is it more of a estimation that still needs tweaking?

Also like how you can isolate so it only shows when you have a decent amount of samples so you can ignore any random readings

[discopotato03]

The late ViPec does 6 coils but not sure about any other difference . I'm interested to know if the V88 top board does anything else differently .

A .