<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by truesleeper &raquo;</TD></TR><TR><TD CLASS="quote">i had problems with mine not engaged..couldnt hurt to try. Also a problem i had with vtec was it engaging at a point 1000rpm above what i set it at in uberdata, like if i had it at 3000 it wouldnt engage till 4000. Try setting vtec at like 2000 lower than what its at see what happens.


Modified by truesleeper at 11:09 AM 5/5/2005</TD></TR></TABLE>
fuel modifiers aren't going to cause that. Maybe your vtec wasn't engaging late, but instead your stock tach is off. I have this problem and my vtec doesn't engage until 5500 rpms according to my tach when really it is set to 4900 rpms. Same goes for my rev limiter...i rev out higher on the tach than what i'm really at.

 

Stock tach off by 1,000rpm I dont think so. Also datalogging rpm is same as actual rpm on tach. I think uberdata somehow got confused when u import the maps onto the gsr base and thinks its at 1 rpm when its at another....like a said b4...why not try these i think they take about 2.567 seconds to try

 

well my stoch tag is off by like 600rpms

 

damn...he should jsut do the LED trick so he knows when vtec is engaging if at all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">Maybe your vtec wasn't engaging late, but instead your stock tach is off. I have this problem and my vtec doesn't engage until 5500 rpms according to my tach when really it is set to 4900 rpms. Same goes for my rev limiter...i rev out higher on the tach than what i'm really at. </TD></TR></TABLE>


EX tach is off by ~2-300 hundred RPM, my Fields controler displays this... Which of course is wired via harness to Ecu.

 

yea i guess it depends on your tach. Some are off more than others.

 

Did you replace your cams at all? Nopi sent me NA cams and I totally didnt notice till i hit the dyno and i had the same results. the na cams had to long of a duration.

 

which dyno did you tune your car at? just wondering. was it elite, rs, msc?

 

super rupair, i'm in denver.

 

you should of gotten more hp for that. must be in the tuning. at least 190-200 whp. keep in mind it's only a sohc. the turbo is small.

 

the turbo isn't that small. and don't forget he's a MILE above sea level.

but yes he should be putting out 180whp no prob.

he is still self tuned tho.

paul get that vtack light in and your oil pressure gauge. that'll show alot

 

How about you simply check your oil level

And i dont think you can generalize about any tachs... i know my Si tach is almost 1000rpm off at around 4k. Even though my tach is farther ahead than where the motor really is, but by the end of the gear, the motor is ahead of the tach

 

guys, my tach isnt off.. lol. regardless, look at the graph, it doesnt lie. I made more torque than hp and that means something is wrong


about the oil level, i check my oil level obsessively. it was completely topped off at the dyno, always is.

 

basemap on a small T3 on a Y8 motor @ 7-8 psi.

Sounds about right, now tune it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by s1ngle &raquo;</TD></TR><TR><TD CLASS="quote">guys, my tach isnt off.. lol. regardless, look at the graph, it doesnt lie. I made more torque than hp and that means something is wrong


about the oil level, i check my oil level obsessively. it was completely topped off at the dyno, always is.</TD></TR></TABLE>
yes you are right you should be making more horsepower than you are. That torque curve falls off pretty bad.

 

not to mention the HP curve.. i really dont think i can blame it on tuning totally... my tune is honestly decent, not bad enough to cause my hp to fall off after like 5300 rpm!! i mean cmon, thats ridiculous.

 

Do you know what your afr was at full boost? try adding a little bit of timing. but get an oil pressure gauge first.

 

is your boost falling off?
possibly a leaky wastegate, gasket, charge pipe, or bov.

we had a guy with a similar problem on the dyno 2 weeks ago. turned out he was leaking at teh tb gasket.

 

my boost doesnt fall off at all.


QUESTION: I just hooked up a little LED light to see if my ECU was sending the VTEC signal, which it is, pretty much right where its supposed to be. however, vtec isnt JUST electronically activated right? I mean, if the ECU sends the signal, could vtec still not be engaged if oil pressure isnt high enough? Or does the ECU check for that first?

help me out!

 

My Y8 tach would read 8500 when at 8k.
Everyones is different.

Make sure vtec is working. Hook up a light to the solenoid. Easy way.

Even for the elevation the #'s sound low so something is up.

Good luck dude.

 

did you read the posts? i just did that, hooked up a light.

 

Why did you only run it up to 6300 rpms? Isnt the revlimiter at 7200? Or maybe the whole graph should be shifted over to the right 1000 rpms. It makes more sense if you do that. Just a thought.

 

ya think??? hrmmm, i dont know that the mechanic even ran it out to redline, he probably saw the power dropping off and decded not to. But i wonder....

 

try a different ecu
i had an ecu that was giving me troubles similar to that. it turned out to be the transistor that is needed to activate vtec.

 

i think the ecu is fine, i made a vtec test light, and it comes on when its supposed to. its gotta be mechanical, oil pressure or something.