How Much Can Original Ecu Handle?

[ksx]

Hello everyone,

I have an R34 GTT with open air filter and 3" cat-back exhaust system. Thinking of adding a HKS EVC-S boost controller. Will that work just fine with original ECU or will the engine go dry (air/fuel mix)?

What if I install a downpipe and race-cat as well? Will it still work fine?

Thank you very much,

Karl from Stockholm, Sweden

[KiwiRS4T]

Obviously it depends on how much boost you run. If you want to run 12psi (max recommended for stock turbo) you may run into problems. First get the full turbo back exhaust then look into a Nistune chip for your ecu.

[ksx]

Yeah, 12psi is what I was thinking as boost level. So you mean that I should get a downpipe and de-cat/sport-cat and a Nistune chip before I buy a boost controller?

As I live in Sweden, and Skyline were never sold here, Nistune chip is quite hard to find. Can you recommend a web store that sell Nistune chips?

After installing the chip a re-map of the ECU is needed, right?

[mad082]

make sure you have a full turbo back exhaust and you can run 12psi just fine. the ecu will manage it fine without going a nistune, although a nistune would make it better. would be wise to also get a front mount intercooler as well if you don't already have one.

[joeyjoejoejuniorshabadoo]

keep it to 12psi max and the stock ecu will have no drama's.

if you can afford to o nistune, and dyno then it will be HEAPS better tho

the r34 SMIC is also an easy option and can flow up to ~200rwkw

[W0rp3D]

You wont lean it out, once you max out the ecu it goes into rich and retard mode, so once you hit the limit you will be losing power, also one you hit that limit (around 200rwkw) you will also need new injectors, afm and fuel pump, your next step should be a full 3" exhaust, if you have a 3" cat back then just buy a 3" dump (i have a 1 piece split dump that you can get from just jap in the traders section) and 3" cat or if the cops are not nazi's over there buy a de-cat pipe, should do the exhaust before upping the boost tho.

Also if you dont have someone over there that can tune nistune then dont bother, go for something more common like a power fc that any decent tuning shop will know how to tune, wont cost much more than nistune.

Edited May 22, 2010 by W0rp3D

[ksx]

Thanks for the tips guys!

Will go for a new front pipe and 3" cat and FMIC first, it seems to be the smartest way of doing, as you say. Boost controller will be the 2nd step.

If I don't want to go for a Nistune (which is hard to find in Sweden) or a Apexi (which is so damn expensive), is the HKS FCD the best option to control air/fuel-mix?

[joeyjoejoejuniorshabadoo]

the best option is to speak to your tuner and ask them what they are comfortable tuning

also stock injectors, fuel pump, and afm can all flow around 230rwkw

[W0rp3D]

also stock injectors, fuel pump, and afm can all flow around 230rwkw

depending on condition and what dyno you use, at 210rwkw my injectors were at 100% and my afm was tuned past its max.

[mad082]

can also depend on the condition of the engine as well. a stronger engine will make more power with the same amount of fuel, etc. but on a mates 33 that i did a turbo install on the AFM wasn't quite maxing out at 250kw. it was getting very close to it (high 90's %), but hadn't quite it 100% though. that was with a 3076 with the skyline rear housing running 16psi. can't remember if he had the injectors in at the time or not. i have a feeling the injectors may not have gone in until after that as the stock ones were getting extremely close to maxing as well. i'd have to go looking through the dyno thread to see whether they were on the mods list at the time of the dyno run.

[JonnoHR31]

definately does vary a lot. i was hitting 100% inj duty with 185rwkw. was 12:1 at WOT too

[mad082]

things like your fuel pressure, how well the injectors are working (how clean they are, etc), etc will all affect how much power you can make on the stock injectors.

[bubba]

The ECU's from the different models seem to be less tolerable as the years went on.

My R32 RB20DET ECU handled everything from full exhaust/fmic upgrades, 14psi on stock turbo, 12psi on 25 turbo AND in the end, a 3L bottom end.

Here's another bit of trivia.. stock afm made 183rwkw on the RB20 with no signs of maxxing. Same afm on the 30 making the same power (same turbo), maxxed out a little over 6000rpm.

[JonnoHR31]

things like your fuel pressure, how well the injectors are working (how clean they are, etc), etc will all affect how much power you can make on the stock injectors.

not to mention a crap exhaust, a motor that just doesnt wanna make power and a low reading dyno, which were the main factors for myne.

20det ecus seam to do fairly well with more airflow, but then again 20s need something to help them out

[Turbo_Knuff]

Hello

It´s not to hard to find Nistune here in Sweden. www.japtuning.se have it just contact them.

http://www.japtuning.se/index.php?page=sho...t&Itemid=35