How Important Is A Tune After Front Mount Install?

[Munkyb0y]

oh man. i'm not angry. that'd be cyber-weird. i just dont want to pollute this thread with crap....and you might've noticed, i dont like excessive negativity for the sake of demeaning ppl, or their opinions.

so we'll agree to move on, yeah? done

edit: seriously, this will be the last 'GTST is hard to like' post of the thread. keep it on track.

Edited December 18, 2007 by Munkyb0y

[R33GOD]

oh ooo. u givin out hugs man lol.

i can see this gettin locked soon enough.

monkeyboy dont take peoples opinions too seriously if you dont agree with them. end of the day forums will be forums

[swanny180]

Lol @ thread

IBTL yeahhh...

Edited December 18, 2007 by swanny180

[Jmaac]

stock ecu has provision for slight changes so I wouldnt bother unless you added a pod as well etc.

[GTR-80Y]

At the end of the day its your car, don't let any1 tell u what u can and cant do with it.

And don't mind Tolga (GTST) hes jus cut cos he couldn't have me and his bf moved to Canberra haha

[GTAAAH]

If you ask me, just look at ur FMIC as a supporting mod and it'll all seem worthwhile. I lost a lil throttle response with mine, but at least you don't have to worry about the intercooler hampering performance for future mods.

The 2 reasons i wanted mine were 1) for when i upgrade the turbo and 2) because fmic's look pimp

[Munkyb0y]

lol, yeah i'm not regretting it. the only thing i regret is now it's got me looking at upgrading the turbo

[jase-r34]

Hi guys, first of all great entertaining thread! :laughing-smiley-014:

I dont mean to butt in on this topic, but ive been thinkin bout upgrading to a FMIC on my 34. From everything ive read on this forum from most people its really only worth doing if im looking at upgrading my turbo....which im not doing anytime soon...

I only plan on running 10psi and have just added a 3" turbo back exhaust so is a FMIC really worth the money?

Once again sorry for butting in on the thread

[TTT]

At the end of the day its your car, don't let any1 tell u what u can and cant do with it.

And don't mind GTST hes jus cut cos he couldn't have me and his bf moved to Canberra haha

trying to work out who my boyfriend is supposed to be.. I don't think I know anyone in Canberra...

Sure it wasn't your husband?

AND, I believe I turned you down.

Jase-R34 - have a search for R34+SMIC on the forums

you will find peoples results on what power they have while still using the stock cooler etc.

as this thread will show you, the final decision is up to you.

I'm guessing that with 10 psi and stock ecu and normal intake and exhaust mods on your R34 GTT, it will be making around 165 - 180rwkw.

if you are looking for opinions, mine is that you do NOT need to upgrade that intercooler.

[jase-r34]

Thanks for that GTST, I think i might save some money and not do the FMIC until i eventually do upgrade the turbo. Im brand new to turbo cars so all of your opinions and info are much appreciated!

[GorGasm]

I have to wholeheartedly disagree with GTST about the R34 SMIC to FMIC issue.

I gained 16rwkw kw between my R34 SMIC and 600x300 FMIC install.

Also the difference in performance was instantly noticeable for me. Have you ever noticed how your car drives harder during the evenings or on cool days?Thats how it feels all the time with the FMIC fitted.

After a brief thrash you can feel the r34 cooler is heat soaked. Not so with the FMIC.

I think the FMIC is totally worth it in Aussie heat let alone in NZ.

heres my dynos, differences are from R34 SMIC to FMIC and a touchup on the SAFC/SITC

before

after

[zertek]

this thread has gone to s**t.

P.S no its not very important, wait for further mods before a tune

[Sydneykid]

On the dyno I could eassily duplicate that result without even changin the intercooler. Simply do consecutive power runs, heat soak the intercooler and make sure the dyno fan is pointing at the radiator, not the SMIC. Then let it cool, point the dyno fan at the intercooler, not the radiator, and bingo there's your power increase.

Many dyno guys don't even know that they are skewing the result on a car with a SMIC by pointing the dyno fan only at the radiator. Then when it comes back with a FMIC, of course the dyno fan is pointed at it, to get air to the radiator behind.

Obviously when you are driving along the road the air is going to both the radiator and the SMIC. That's why our dyno has two fans, because we try and duplicate race conditions.

As for the cool night power increase, that's mostly to do with the lower ambient air temperatures. Mostly the air temp going into the turbo, that has a 100% effect on power output, Whereas the most efficient intercooler I have seen was 70% effective at best.

Merry Xmas

Gary

[Adriano]

Um gorgasm, do you think the power difference in the two power runs could be due to the different boost being run, 11.5psi vs 6.5psi.

[jase-r34]

Have a closer look adriano, its 11.2 psi vs 11.5 - so very minimal difference...

[J_Red33]

I have to totally agree with your analysis there SK about the dyno-fan set up. I went to a dyno day SAU SA had last year & had my 33 run on the dyno (Full turbo back 3-inch system, everything else standard including SMIC).

I watched other 33's that didn't have a complete 3-inch system & while their power figures were lower, they were more consistent with a maximum of about 2-3 RWKW variation, like every other car that went on the dyno (primarily skylines & other nissans of various specs).

However when my 33 went on it dropped 7 RWKW from the first to second consecutive run (warm day ~28-30 degrees) on a well warmed up engine. Power figures were 177 then 170 RWKW respectively.

While I believe that the efficiency gained from the exhaust system had also highlighted the inefficiency of the intercooler, it had been exacerbated by the fact the fan had not been blowing very much air on it, if any.

Having said that. I do notice a significant power loss on warm to hot days (feels a lot more that just 7RWKW) regardless of the speed being travelled at, and am sure that it would maintain a higher & more consistent amount of power from a much larger fmic in these conditions.

Edited December 22, 2007 by J_Red33

[swanny180]

Have a closer look adriano, its 11.2 psi vs 11.5 - so very minimal difference...

Looks like 11.2 vs 6.5 psi to me...

In which case the dyno results are compromised to the point of being absolutely useless at proving any modification related gains

[rev210]

as per the original question, the retune may be benificial.

The front mount will be of limited value if any to the stock turbo but, will help once you step up to a bigger unit as planned.

Further to what sydneykid stated, a dyno is a bit lacking when it comes to high speed indications of both intake air draw /cold air feed and the intercooler performance. Thats what makes data logging and your own O2 wideband such a cool thing to have. I've always asked for my final tweaks done with the bonnet down on the rare trip to the dyno to try and help this out. Always results in a lower power figure but, I have found my cars always run more consistantly.

[GorGasm]

both runs were at a shade over 11 psi.

Ambient temps were roughly the same, dyno is the same, the fan may have caused a bit of a difference.

The 6.5psi run was with the boost controller, safc and sitc set to zero.

I noticed the difference in performance though

[Munkyb0y]

i thought i should finally update this thread

question: How Important Is A Tune After Front Mount Install?

answer: very important!!!

had the tune done a while ago now. dyno showed gains of around 15-20kw at same boost. but more importantly, the proof is in the driving. and there are certainly benefits throughout the range.

if you're upgrading to a fmic, get it tuned, eventually

thanks nismoid and a few others for the good advice

Edited July 23, 2008 by Munkyb0y