Alright So my engine is all back together after a couple nightmarish problems with RS machines, and the guy that ported my head, but im still having some problems.

The car is an LS/Vtec 10:1 CR running Hondata s200 with precision 1000cc injectors, MSD 6al.

Now the problem is that at 5000rpm's the car just breaks up like crazy like it can barely go over that rpm

Here is what I have tried and ruled out...
Tunning is not the issue...car does not respond to anything
complete new Dizzy
redid all grounds
new MSD 6al box
Plugs and wires


I have a CEL of a VSS due to the fact that I put an LSD in and it keeps eating my VSS gears. Can this be aproblem? Could it not be jumping to high speed maps?

Also I ran the car without boost and it did the same thing at the same RPM.

Any help would be appreciated.

 

God doesnt like LSV...thats the only logical reason

 

tried regaping the plugs.

 

you sure someone did not **** in your gas.

J/k chad. Hopefully you get it running for this saturday. Did you try smaller injectors? Like 750 or 880's?

 

whats the wideband say?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by underpressure02 &raquo;</TD></TR><TR><TD CLASS="quote">you sure someone did not **** in your gas.

J/k chad. Hopefully you get it running for this saturday. Did you try smaller injectors? Like 750 or 880's?
</TD></TR></TABLE>

I don't know my brother was zipping up his pants when he was walking away from my car

I am about to try diffrent injectors tonight, and maybe pull out the hondata and run the hack on a diffrent ECU to see if the hondata ECU is bad.

Also the widband is showing11.5-11.8 then as sson as it hits 5000rpms it just starts throwing black smoke, but like I said I changed the fuel and ignition maps drastically and was on the dyno for about 5 hours with no luck.

Atleast it runs great and is making great power till 5000.

 

MAYBE I could let you use my aem. MAYBE JUST MAYBE.

 

Anyone have any other ideas? IM really lost here!

 

The breaking up problem is easy to fix , no VSS no vtec . Why you are eating the gears is the gear on the diff have a problem like burr or something . I have never had the gear problem but I have had VSS sensors go bad and no vtec and care will run rich as hell because of mapping .

 

[QUOTE=Highrevs99]The breaking up problem is easy to fix , no VSS no vtec . [QUOTE]

Thats what i am kinda thinking, but with Hondata I thought if I have a fixed vtec crossover point it will engage anyway.

Also on the dyno we put a switch on the vtec selenoid to switch it to vtec at 4500rpms(just to make sure it is engaging) and it still did the same exact thing.

 

It really sounds ignition related. Can you try it without the MSD? And when you say tried new dizzy you mean another used one or a new aftermarket one?

 

Sounds like ignition, make sure the plug wires are not grounding out before the spark plug. Also, what fuel pump you using? Have you used it before?

Also, can't you disable the VSS with hondata? I know mine is disabled with uberdata. VTEC engages when fully warmed up, even at a standstill.

 

i dont think its th VSS&gt; i think i ran mine without it one time and it was fine.

 

I tried a brand new dizzy and I tried pulling the MSD box along witha new MSD box.

m R g S r, im trying to find out if my vtec does engage regardless of the vss but im unsure if it does engage like you say your uberdata does....anybody know for sure.

thanks guys...any other ideas?

 

sounds to me like it is running crazy rich , and is it mapped for the 1k injectors ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C1CYA &raquo;</TD></TR><TR><TD CLASS="quote">sounds to me like it is running crazy rich , and is it mapped for the 1k injectors ?</TD></TR></TABLE>
thats what i was going to say.. mine use to do what your saying it it was because of over fueling.. also check to make sure all you msd wires are tight mine came loose once and it made some crazy stuff happen..hope you figure it out..

 

do you have access to rom editor? you can tell in there if it switches to the hi speed maps.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">do you have access to rom editor? you can tell in there if it switches to the hi speed maps. </TD></TR></TABLE>

on dataloggin it switches to the high speed map, but only for a split second and then it breaks up.

 

like I said before I don't think its the fuel maps...cus myself and two other reputable tuners have tried numerous things on the dyno and had no luck with any of the maps. and if we cna get it to run flawlessly until 5000rpms why couldn't we do it after that?

 

What is the AFR when it starts to break up?

 

air fuel was 11.8-11.1

 

Is it only at WOT, or partial throttle?
What fuel pump?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by m R g S r &raquo;</TD></TR><TR><TD CLASS="quote">Is it only at WOT, or partial throttle?
What fuel pump?</TD></TR></TABLE>

it doesn't matter what throttle i am at it still does it. Im also useing a walbro 255 fuel pump.

 

Little update....

I put a v-afc in got rid of hondata and ran my 1000cc injectors with the vafc. I know it sounds weird, but it worked and only ran in like 10.9 area. Also I just want you to know I only did this to test if the car would break up it is not my managment. Well the car still broke up just like it did with the hondata...dame RPM...same everyhting.

I also pulled the MSD box and just put on a new cap coil, and rotor which actually alowed me to run the car up to whatever RPM I wanted, but as soon as I went more than a 1/4 throttle it broke up(basically lost all power) This was with the hondata!

Anyone have any other suggestions?

 

DOHCarp,

This last week i've had 2 allmotor cars come in with hondata do this same problem. Both cars run MSD boxes and hondata s200. Both cars would be fine up until vtec engages or 5000-5500 rpm, then i'll hit this mysterious rev limiter. While on the dyno with both cars i was monitoring AFR's and everything was fine, Fuel pressure was fine. I replaced distributors, ecu's, map sensors, tps sensors. I know this sounds funny but for ***** and giggles i replaced the VTEC SOLENOID and viola! It pulls smooth all through to redline!!! I think the solenoid was sticking and causing the vtec crossover to be a rev limiter....Just try replacing it and see...Hope this helps...Good luck.


Jeff@torquefreaks.com