problems after installing new FMIC

[Munna]

Yesterday I install a brand new Hybrid FMIC to my r33 gtst.

about 12 months ago I had a SAFC installed and tuned as I had flat spots (running to rich) the SAFC fixed that problem.

I had being running 10psi before the cooler was installed but now I cant run anymore than 7 or the car seems mess and cough under load. I think this may be due to incorrect setting on my SAFC because now im getting so much more cool air. Do you need to get your SAFC retuned after the installation FMIC? Or am I on the wrong track what else could cause this?

[Jay95R33]

Using a FMIC will mean cooler inlet temps, so your SAFC may need a touch up tune.

Although the coughing and missing sounds like a spark plug issue.

Do you know what type of plugs you have and what size gap they are ?

J

[Munna]

Using a FMIC will mean cooler inlet temps, so your SAFC may need a touch up tune.

Although the coughing and missing sounds like a spark plug issue.

Do you know what type of plugs you have and what size gap they are ?

J

Plugs are near brand new gapped at 0.8. pretty sure its no thats not the problem because the car was fine before the cooler went on. its hard to explain but the car is no realy missing its more of a hesatation might be a boost cut or something?

[Munna]

anybody else had a similar problem after installing a new cooler

[Guest Robo's]

Your SAFC will need to be redone but i shouldnt have thought it would make it spluttery. When i done mine it still ran fine with the old settings. I would be checking for leaks, trying clamping it up a bit more. I encountered this after the first test drive with the new FMIC.

[GTR-Ben]

Try fuel pump.. i have seen a FMIC show up a weak fuel pump and do exactly as you are explaining.

[Munna]

Checked all my piping connections all were nice and tight with no leaks. Called the guys form Ice performance they think that its probably overfueling again now that the engine is getting cooler denser air so im going to get it retuned Wednesday. I will let you all know how it goes.

[rs73]

same thing happens to my car, engine wasnt happy for anything above stock boost, and it was a dying fuel pump.

[Munna]

I guess if it is a dying fuel pump they will be able to pick that up although I had my fuel pump checked out last service they said it was fine.

[rs73]

Just suggesting something that you should check. I know it doesnt make sense, even in my case, but that's what the solution for mine anyway. I've had my dying pump almost a year before it was detected. On dyno the car made good A/F ratio of around 11.5:1 but tweaking the SAFC just doesn't want to change this. Very weird but the stock ECU seemed to compensate for the lack of fuel and fiddled with the timing. Only found out about the fuel pump when testing the fuel pressure and that's it. Got it changed over to a bosch item and the car is happy now with 12:1 A/F ratio and 192.5rwkw (before it wont go past 152rwkw in any boost level).

[Sydneykid]

Yesterday I install a brand new Hybrid FMIC to my r33 gtst.  

about 12 months ago I had a SAFC installed and tuned as I had flat spots (running to rich) the SAFC fixed that problem.

I had being running 10psi before the cooler was installed but now I cant run anymore than 7 or the car seems mess and cough under load. I think this may be due to incorrect setting on my SAFC because now im getting so much more cool air. Do you need to get your SAFC retuned after the installation FMIC? Or am I on the wrong track what else could cause this?

My guess, freer flowing FMIC means more airflow. More airflow is detected by the AFM and signalled to the ECU which is going into rich and retard (engine protection) mode sometime erroneously called "over boost" protection. You don't need extra boost to get it.

Just my guess of course, based on about 10 Skylines I have seen do exactly the same thing.

[Munna]

My guess, freer flowing FMIC means more airflow.  More airflow is detected by the AFM and signalled to the ECU which is going into rich and retard (engine protection) mode sometime erroneously called "over boost" protection.  You don't need extra boost to get it.

Just my guess of course, based on about 10 Skylines I have seen do exactly the same thing.

Thanks for all your replies Rs73 I will get my fuel pump checked out while it is there.

Sydneykid ive read some of your other posts about over boost protection and it made sense. If I understood correctly when I get my SAFC retuned it should fix the problem as they will be able to minipulate what flow the ECU thinks it is getting. Is that right?

[Mark0]

hrmm sounds liek the post I just started

is the only fix if it is the engine retarding to get a SAFC or similar

[NickR33]

My guess, freer flowing FMIC means more airflow.  More airflow is detected by the AFM and signalled to the ECU which is going into rich and retard (engine protection) mode sometime erroneously called "over boost" protection.  You don't need extra boost to get it.

Just my guess of course, based on about 10 Skylines I have seen do exactly the same thing.

I get this exact symptom but ONLY when the car is cold... after almost exactly 15mins of driving it runs fine... go figure

I suppose it will get worse when my FMIC goes in... might have to get it looked at... lol *so lazy*

[Munna]

I get this exact symptom but ONLY when the car is cold... after almost exactly 15mins of driving it runs fine... go figure

I suppose it will get worse when my FMIC goes in... might have to get it looked at... lol *so lazy*

Before I got my SAFC mine did a similar thing to what it is doing now only not as bad. you probly need to one to funny it only does it when its cold.

[NickR33]

yeah I've got a SAFC... still does it... only when cold... will get it looked at when the cooler goes in, prolly just the temp sensor rooted. Let me know if you find the problem.

[Munna]

Well I took my car to ice performance in melbourne yesterday. Found that I had dirty coil packs and my plugs wern't gapped to 0.8. The last time I took my car to a local macanic I had new plugs put in and I asked them to gap them a 0.8. So all this I thought they were gapped correctly when they were not. very anoyed. Anyway after the coilpacks were cleaned and sparkplugs were regapped the missfiring was gone. So they retuned the SAFC and the result was 196 Kw at the wheels on 10.5 psi of boost. very happy with that result and I recomend Ice performance to anyone.

[Guest Robo's]

Haha, i didnt know you get dirty coil packs after installing an intercooler.

Nice results!!

[wilch]

I'm getting a front mount installed on the weekend.

Apart from full exhaust, pod (in cold air box), and electronic boost controller everything else is stock. Is there anything I should watch out for?

wil..

[Munna]

I'm getting a front mount installed on the weekend.

Apart from full exhaust, pod (in cold air box), and electronic boost controller everything else is stock. Is there anything I should watch out for?

Regap plugs to 0.8 install the cooler and see how you go. But you may find installing a SAFC or simmilar will give you a lot better results as your ECU will probably see all the extra air flow and richen your air fuel mixtures with hurts performance big time.