OK... 6000rpm rev limit!?
 

WTF?! Since I built the mini and dropped it in last week, I've had a ~6000rpm rev limit. It seems to change by a few hundered rpms in different gears.

Cam timing? Fuel pressure? VTec oil pressure? Could any of these thigns cause rev limit? Or is it something else?

Re:OK... 6000rpm rev limit!?
 

i dont have the answer to your question but since u live in the kc metro area like i do....can i ask you a question or two...you know anyone who has a DX head laying around...a good one that is...cause i have a lady who needs a new head on her 91 crx DX....wouldnt an SI head just work the same if you have one of those ??? i think they would...not for sure though...and last but not least...you know anyone here in the metro area who is selling an SI motor,tranny and ECU ???? if so i will buy.

thanks
lewis
kc,ks

Re:OK... 6000rpm rev limit!?
 

Actually.. I have a DX head, and the Si (PM6) ECU.. as for a tranny, I'm in search for one of those myself. Have you checked the locals? Rich Ind., JD's, A to Z, Parts Pull, Midway, MO-Kan? They tend to have everything I need..

As for the head, I'll let it go for $50. The ECU for the same.. Let me know, and we can get together and make the deal.

Re:OK... 6000rpm rev limit!?
 

ill take the head most definatly....ill have to get the money from the lady....does it have all the internal parts for it ?? is it in good shape ? no bent valves or ---- like that ?? well let me know...she just needs her DX up and running....thanks again

lewis

email me @
bugman83@kc.rr.com

Re:OK... 6000rpm rev limit!?
 

So your actually hitting the fuel cut? not just 'feeling' like it? Wierd
What ECU? Any codes?
The only things that pops into my head is the cold rev limit caused by a unplugged or faulty temp sensor?

Re:OK... 6000rpm rev limit!?
 

are you feeling VTEC cross over? I have the same problem on a z6 head on a y8 block... every now and then when I hit 6200 RPM the fuel cuts off, seems like some of that ECU memory bullshit to me because it will stop until I restart the car!
Just curious are you using an AFC? I had a really fucked up problem with mine, where I never set my engine to a 4 cylinder and it kept changing my RPM signals... of course the del sols have a tendancy to have the RPM gauge stop reading so I had to rely on the AFC which was saying I was at 3,000 RPM when I was really at around 5-6 :P

Re:OK... 6000rpm rev limit!?
 

Wow, those are both good ideas that I never really thought about... I need to check that crap! :-D Simple things that get overlooked during the swap could easily be the problem.. thanks guys, I'll check that when my car gets home. My g/f took it to work.. she's a junkie, addicted to boost!

Re:OK... 6000rpm rev limit!?
 

Ignitor.......

does the tach jump?
if it does... replace the ignitor kiddies. asm will tell u why i say this...

email me and i can give u a procedure on how to check it.

Re:OK... 6000rpm rev limit!?
 

weelllll ????

Re:OK... 6000rpm rev limit!?
 

Yes, VTec crosses over.. so far, nothing has been fixed. Air Temp is working, per EcuControl datalog output...

Hrm.. Ignitor (Coil?).. ya.. I'll swap that out. Maybe I'm just not getting enough spark and falling off. Now, also, I am using a Y8 head with a 91 Si dizzy.. Every Mini-Me setup I have ever seen said this shouldn't be a problem.. but.. it's also the Internet. Maybe that's it?

Re:OK... 6000rpm rev limit!?
 

the ignitor isn't the ignition coil.

its the ignition module.
180 buck new piece...

pretty soon its gonna die completly.

Re:OK... 6000rpm rev limit!?
 

I would try another Dizzy if you have one on hand... before you start replacing ignitiors...

Jeff

Re:OK... 6000rpm rev limit!?
 

IT's just strange that it worked fine to the minute that that I took the 1.5 out.. and ptu the 1.6 Mini in.
Fromt he moment I started new engine, it's done this. Hrm..

Re:OK... 6000rpm rev limit!?
 

What are you running for fuel management?? Are you using ghettodyne?? Or just ecucontrol??

Re:OK... 6000rpm rev limit!?
 

Well, uhm, EcuControl isn't fuel management.

I'm using my V-AFC for fuel..

My a/f gauge says it's not a fuel related issue, pressure, or otherwise..

I think we're ont he right track with the ignition issue, except it's weird that it would start only with the new motor.

And even so, I should run way rich when it happends because of the lack of fire.. soo.. who knows.. this sucks. :(

Re:OK... 6000rpm rev limit!?
 

I have seen stranger things. I put a new head on my car and it seemed like everything went bad after that. )2 sensor was the first thing to go. After that the iacv valve and then the cap and rotor started acting up. You might be surprised as to how simple the problem is. Check the things you don't think it could be first.
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Re:OK... 6000rpm rev limit!?
 

them two ignitors are interchangeable..
just take the one out and put it in the new one....

should take care of the problem.

Re:OK... 6000rpm rev limit!?
 

this is probably really not likely, but maybe your plug wires are backwards?

I have done this so many ------- times its not funny...of course if nology at least made their plug wires different lengths it would be nice

Re:OK... 6000rpm rev limit!?
 

check the damn revlimit setting on the afc. I bet thats most likely the problem.

Re:OK... 6000rpm rev limit!?
 

I think turboef9 is a bit smarter than that :-\

Re:OK... 6000rpm rev limit!?
 

Yeah he is but i was taught something. KISS. Keep it simple stupid. Sometimes I get really in depth with problems when its just something so simple. Basically its like ripping a wiring harness looking for an open when all it really was is just a F-in fuse.

Re:OK... 6000rpm rev limit!?
 

OK.. let me start to answer somethings..

!) Swapped ignitors, same problem..
2) With VTec off, I can rev to 6500...
3) I'm not sure what AFC you have, but, mine doesn't have a "Rev limiter" anywhere that I have seen. I'm using the Apexi V-AFC.
4) I seem to have a head gasket leak!! I'm SOOOO hoping that this is the problem.

Lets think about this, and tell me how probable it is:
Mini-me, high compression motor. Runs fine when low RPMs, low boost.. why? Power output is very low, and steady.. when boost kicks in, at higher RPMs, more power, more stress on the gasket.. Causing my engine to buck out. Maybe I get more RPM out of it (6500) when VTec is off because I'm producing less power due to the shorter valve duration?

Does this sound possible? (Either way, I'm throwing an overhaul party this weekend.. I'm going to repalce a bunch of things, and hopefully tackle this bitch)

Re:OK... 6000rpm rev limit!?
 

yeah, or your bleeding boost off into other crevises of the motor since there is an increased lift on the cams (its leaking through the gaps of the headgasket). Or its just running unsteady... all in all get the fucker fixed dont rev it up anymore :)