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Problems On Start-up

WYTSKY

By WYTSKY,
in Engines & Forced Induction

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WYTSKY Veteran

WYTSKY

Posted
Posted

Hey guys, just wanted to ask a question about when I start up my recently turboed R33 GTS4 (rb25deT)

I got it dynoed now and got the timing fixed up, it is running rich, but a powerfc or something alike will fix that,

Problem is when I start to drive the car in the morn and it is cold, I'm finding that at about 5 grand it is sounds like it is missfiring, it wont go past bout 4,800 - 5,000.

When the car is warm she is better, still finding when you want to get it in the high revs that she hesitates for a lil, which it didnt when it was an N/A.

I dont know what it is,because as I said the timing was fixed up and new sparks, which were gapped correctly.

Is this a turbo thing or do I need to fix up sumthing?

Thanks, Adam

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mad082 Grand Master

mad082

Posted
Posted

it is probably your coils aren't able to keep up with the job. try and borrow someones coils and see if that gets rid of it. if it does then you need new coils.

also, find out what sort of plugs were used, with what gap and what heat range.

WYTSKY Veteran

WYTSKY

Posted
  • Author
Posted

LOL.... I was just waiting for somone to say it is stupid to push her first thing... but when u live on a main road and trying to get out in morning traffic.....

but that still doesnt explain when the car is warm and at 5 grand.. why it is still a lil hesitant

so coils then? hmm... as this is my first car everything is new to me.. could anyone point me in the right direction? places to buy? etc... anything is handy!

Cheers,

Adam

UCD15R33 Experienced

UCD15R33

Posted
Posted

well split fires are a dirct replacement coil thats gives youa few more horspower, negun.com have splitfires for 500 buck delivered to ur door or try a local jap wreckers they range from 110 to 150 depends on wrecker and what series the car is one is a little cheaper than series 2

WYTSKY Veteran

WYTSKY

Posted
  • Author
Posted

Thanks for the help guys, I would have thought the current coils would handle alright... unless do turbo skylines have more powerful ones?

Im only getting roughly 150-160 rwkw + 10-20% at front so max would be bout 170 - 180 awkw all up.. you wouldn't need $500 coils yet would you?

thought my fuel pump would go before anything

WYTSKY Veteran

WYTSKY

Posted
  • Author
Posted

Hey guys.. update...

The miss firing is also when the car is at operating tempurature.

I did find it wierd when the car got dynoed roughly 3 days ago and there was no missfiring, but I figured out why when doing a few tests...

NOTE: The missfiring or whatever problem is happening starts at bout 5 grand

1. It happens when I drop a gear and put my foot down..

2. It happens when I put my foot down in any gear..

3. It DOESNT happen when I slowly rev the car up...

Which is why when the car was on the dyno and it was powered up slowly why it didn't do anything.

Does this change anything? am I still meant to be looking for coils? any good reccommendations on brands?

Thanks, Adam

joeyjoejoejuniorshabadoo Grand Master

joeyjoejoejuniorshabadoo

Posted
Posted

After 2 hours on a dyno my car was fine on stock coils.

on the road it misfired

to fix it the plugs were gapped down to 0.6 then more dyno....

but i'm still getting new coils when the new turbo goes in.

WYTSKY Veteran

WYTSKY

Posted
  • Author
Posted

So basiclly new coils are the only way out of this? cuz at first the turbo conversion was a bargin.. now everytime I fix up one thing the next happens!

Im happy with the power gains.. but can 33 gtst's use other engine coilpacks?like ... 34 gtr's ? or 32 gtr's...etc...

GRR... Annoying little things these are.

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