Soooo everything was fine until you changed the plugs and fiddled with the vacuum hoses? Seems like the issue is obvious to me. Triple check your changes to the vacuum connections...

Also, your MAP sensor may be dead. Blown S2k's have limited MAP life. I know from experience. Pressure fatigue kills 'em.

 

Fair point above, I misread it and thought you were having probs before changing the plugs etc...

Wonder if its initial spark blowout? Did you re-gap them Kevin?

Also, how does the car drive with the FMU and electronics in place, and with the belt off? Not in relation to your problem but just interested if its happy running like that. If so I may have to do this for a short time. It will run way too rich up top as there isnt enough air to mix, but v short term it should be ok?

MB

 

He said he went back to his previous plugs and the problem persisted.
Any response from Vortech yet?
Found your problem yet?

 

No response from Vortech!

And I still have the problem!

I'm going to a Dyno day today so maybe I'll solve the issue there. I'm going to try and temporarily swap the MAP sensor with another S2000 owner and see if that helps.

I have noticed that now I've installed the VAFCII between the Vortech boxes and the ECU the problem seems slightly worse. I don't understand this as the VAFCII is in purely monitor mode.

Mark, the car drives perfectly with the SC belt removed, no hesitation at all. As you say I'm sure it'll run a little rich due to the air intake restriction caused by the SC.

 

Yup, customer service at its finest!

 

[QUOTE=xviper,Dec 11 2005, 09:36 AM] Yup, customer service at its finest!

 

Comptech seem to be very good at CS, Im appalled at Vortech tbh. It doesn't take long to reply to an email and being in the Uk there is nobody to help me here! The guys on here (Xviper etc) have been very helpful.

MB

 

Problem still exists but I did manage to rule out one more possible cause the MAP sensor.

I changed my MAP sensor with that from another S2000 and the second Dyno run was exactly the same.

The Dyno plot which I will post as soon as I have it digitized showed severe hesitation just prior to VTEC change over and then spikey power delivery all the way to 9000rpm.

Peak power was 248 rwhp which is down from 275 rwhp when this SC was used on my original engine.

I'm running out of ideas as to what is causing this problem, so if anyone can help I would much appreciate it.

 

has you done a valve adjustment? since you changed you shot block it is worth to check it, when I returned bact to FI I had to adjust all the valves intake distance was 19mm instead 21mm.


Regards

 

I haven't checked them since I adjusted them when I installed the shortblock (+/-6000kms ago).

The engine sounds good and seems to run perfectly without boost (SC belt removed).

I really suspect one of the Vortech boxes or the ECU, it is strange how the problem seems to get slightly worse when the VAFCII is inserted between the Vortech boxes and the ECU.
I can confirm that the VAFCII never sees boost as the manifold pressure never reads higher than it is with the engine off.

Also I don't get any CEL's thrown.