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Yellow R33 At Calder Last Friday! (please Read)

Nabil

By Nabil,
in Engines & Forced Induction

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Nabil Rising Star

Nabil

Posted
Posted

Hey guys I ran my car last Friday at Calder backed of at say 5000rpm in first gear coz it bogged and held back.

Initially, I assumed I had a vaccum leak from were i plumbed my blow off valve from. Cant be fuel supply coz I had a full tank.

However, after removing the tube and returning the blow off valve set up back to atmospheric It bogged a little again. It only happens when Im hard on the throttle every now and then. Some times its cool and sometimes it decides to bogg.

It made 211.8 rwKW on 14psi at C&D with a dump back exhaust (no cat), SAFC, APEX fmic, fuel pump. Car showed no signs of problems on the dyno. It made 193 rwKW on 8psi. Will post dyno graph shortly.

Need to know before Friday coz im running it again at Calder. Any info will be most appreciated.

PS plugs are gapped at 0.6mm, motul turbolight and use BP ultimate.

Any ideas what i should expect from 1/4 mile time and mph. (Using standard suspension and street tyres.)

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

.6 is far too much, should be no more than .8

If you need to go to .6, you probably have a coil issue, or plugs arent good condition

As for times, 105mph @ 13.5 is my stab for around the 190-200rwkw mark, bein you do have a stock turbo...

And i wouldnt be using 14psi. Its really pointless IMO.

Go back to 10-11psi, will save the turbo from dying aswell.

I ran 12.9 @ 109 in 225s with 215-220rwkw :ermm:

Nabil Rising Star

Nabil

Posted
  • Author
Posted

My mate has 235rwkw 12.4sec 1/4mile and runs the same plugs with 0.6mm gapping and has never had a problem. btw the plugs in my car are brand new. Just to remind you... there were no signs of problems in ignition or fuel supply on the dyno.

Any ideas on my suspension set-up?

Thanks in advance.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

So what if he didnt have a problem?

Are we talking about your mate and his or your car here dude? :D:ermm:

Things might well have been fine on the dyno, but they (obviously) arent now are they? :sorcerer:

Plugs being new doesnt mean a lot when the gap indicates you have ignition issues if they are gapped down that far, hell... i was running 24psi, 269rwkw and race fuel and i didnt need them gapped that small.

No-one is going to have a magical answer for you, it could be lots of things, ignition is the place to start however.

As for your suspension, you have what you have is not going to affect times greatly when you have what is essentially a stock car

It will come down to driver/launch/tyres more than suspension at this stage of the game... plus tyres are cheaper, and expirience is free.

So again, my prediction above of 13.5 @ 015mph stands... if you cant drive, closer to 13.8

Robo's Mentor

Robo's

Posted
Posted

Reducing your plug gap to 0.6mm is only hiding your miss. You have a problem with it so you need to fix it. Reduce your gap will fix it, but your performance will suffer slightly. Your call.

I had the same problem and had to reduce the gap to 0.65mm , then i bought some spitifires and now run them at 0.85mm gap with alot more boost, no misses what so ever.

Sydneykid Grand Master

Sydneykid

Posted
Posted
Hey guys I ran my car last Friday at Calder backed of at say 5000rpm in first gear coz it bogged and held back.

Initially, I assumed I had a vaccum leak from were i plumbed my blow off valve from. Cant be fuel supply coz I had a full tank.

However, after removing the tube and returning the blow off valve set up back to atmospheric It bogged a little again. It only happens when Im hard on the throttle every now and then. Some times its cool and sometimes it decides to bogg.

It made 211.8 rwKW on 14psi at C&D with a dump back exhaust (no cat), SAFC, APEX fmic, fuel pump. Car showed no signs of problems on the dyno. It made 193 rwKW on 8psi. Will post dyno graph shortly.

Need to know before Friday coz im running it again at Calder. Any info will be most appreciated.

PS plugs are gapped at 0.6mm, motul turbolight and use BP ultimate.

Any ideas what i should expect from 1/4 mile time and mph. (Using standard suspension and street tyres.)

In summary, 212 rwkw and an SAFC with the standard turbo.

Night time, colder (denser) air compared to daytime, hotter air on the dyno.

My first guess would be that the standard ECU is getting into R&R mapping because of the increased airflow.

My suggestion would be to ake it back to your tuner and tell him what is happening. He may be able to sneak a bit more corection into the SAFC to allow for the night time running

OR

Wait unilt summer before you run it at night time drags.

:P cheers :huh:

  • 2 weeks later...
Nabil Rising Star

Nabil

Posted
  • Author
Posted

Yeah ran again the following friday.

14.2sec @ 100.9mph @ 8psi

13.8sec @ 104.9mph @ 10psi

13.9sec @ 105.5mph @ 12psi

13.7sec @ 104.8mph @ 11psi (this last run i plumbed my blow offf valve back whilst waiting in line)

My 60ft times were shocking they ranged from 2.3-2.6secs. My tyres let me down they were only 25/225's and hard compound. So in regards to my mph im guessing a low 13 with good traction.

I did hit R/R mode about three times but once I put my headlight back in place it ran fine.

One thing im worried about is that whilst burning up the tyres before my run i noticed that my rev limiter does not exist. My leg was still flat on the throttle and somehow i pushed the clutch in at the same time (dont ask why i was nervous!!!) so thereby placing it in neutral; my revs went all the way to 9000rpm.

Any idea to wether or not my engine has been rebuilt in japan? Or am i dreaming? Im guessing when the SAFC was installed by the previous owner in Japan they removed the limiter. But it must be for a reason!

Now, should I opt for a PFC first or a Turbo upgrade (thinking of something with response say GT2871R with 0.86 exhaust A/R) ?????

Thanks you to all in advance.

Bill

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