ok so I have been plagued with problems with crome this year and I don't know if I am missing something or not but I am almost ready to move onto another engine management.
- First of all (and this has been a problem for 2 years) whenever I am tuning my car, for some reason crome is not actually using the high cam map even though vtec is engaging. Why? I have to tune the car for low and high cam on the LOW CAM map only.
- Also for some reason after I have dyno tuned the car (on an dyno dynamics load dyno) and everything goes ok, I then road test the car make sure everything looks good (a/f's, limiters, vtec crossover, etc...). Then for some strange reason (perhaps days later) the car decides to forget what it was told and the A/F's begin to change.
For example:
- In low cam the cars runs pig rich but then goes lean in vtec.
- The vtec crossover is occurring 1000rpm later than programed.
- The rev limiter doesn't work. (but never did)
So I road tune the car and straighten out those new issues except the rev limiter still wont work(for the time being).
Is it possible that crome isn't using the advances table (ECT maps and IAT maps, etc, etc..)?

The other question that I have is (and believe me I have searched long and hard) what exactly is Debug Mode doing??? (O2 and more.....)?

For some reason no matter what I try I can not get the Rev limiter to work in crome. I have burned chips, ran on the Ostrich and still no limiter. I am at the end of my rope and I am competing Targa Newfoundland in 3 weeks!! I need my limiter! Please help Crome gurus!!!

Oh and I never get any Check Engine Lights BTW

My setup:
1995 Integra RS
P28 chipped using Ostrich and Burn1 (tried 2 different Laptops and makes no difference)
Newest version of crome pro (due to time bomb) 1.5 I believe
P30 Rom (tried making a new Rom and copying over the tables)
Boosted setup at 15psi on 91 pump gas (The best we can get in Newfoundland)
GM 3 bar map sensor
B16A1 Head
RC 750cc sat Injectors
TD44U Dizzy with 93 accord Dist cap and 94 Del sol rotor
MSD blaster II coil
Taylor Wires
BKR7E plugs
SST 28pins chips (Burn1 setup for the proper chip) (tried multiple chips)
All sensors appear on the datalog to be functioning properly
Mechanically VTEC is functioning without any codes

 

Are you datalogging to ensure the ecu is seeing proper signals etc ?

To eliminate all of your major headaches I would recommend switching to a more stable ems such as Hondata, Neptune, eCtune.

 

Nothing wrong with crome if you know what your doing.

As for the problems your having with the high cam maps...
The map trace only works in the high cam maps when you hit vtec as oppose to the low cam maps the map trace is always there.

 

I have researched and tried everything to fix these problems and nothing works... As for the high cam maps (J.Mills) what are you saying? that i can only make adjustments when the car is in vtec? I know where the trace goes and I make the adjustment and it makes no difference. Ive tried "put" to ecu verified the ecu... gotten from the ecu and my changes are made but the car is not using the high cam map... Its almost as though its using both the maps at once. the adjustments are needed in both maps in order for there to be any change in the Air fuel....

 

I would try another ECU.

 

no one really knows what debug mode is lil... just leave it unchecked...

do you possible have a "low cam maps only" checked somewhere in perameters?

 

do you have a vtec pressure switch on this vehicle? Also you should go to the forum.pgmfi.org and post your .bin in the crome section. That way others that are used to tuning with crome can review your .bin and give you suggestions.

This advice goes out to everyone. If you are not comfortable tuning ecu's and you want to use crome then you should pay someone that knows what they are doing and is comfortable with the software to tune your car. I have seen people waste 100's of hours on a car just because they are overthinking simple problems.

 

and if you do move on, go to e-ctune. and get it from xenocron!

 

Unfortunately I don't have the option to pay someone else to tune my cars because no else in Newfoundland has as much knowledge about crome as me and thats saying something.... I have tuned other peoples cars using crome and i have not run into these issues... I have a half chipped P06 ECU which I am in the middle of chipping now so i am going to try that next. if that doesn't work i will just get an MSD 6AL for a limiter and move on to Ectune or Neptune next year. I'm not prepared to switch programs now, work out the bugs in that, and have to completely re-tune. I will post up my Bin file on PGMFI.org to see if anyone spots anything.

Also, whats the better program value, Neptune or eCtune? Neptune is a fair bit more expensive but what are the benefits to make it worth while? It looks to me that eCtune is just as good and user friendly but i have no experience with either...

 

are you sure that j1 is jumped? if you aren't hitting the right rev limiter, then it sounds like the car isnt running the right firmware..

The reason i ask is: the rev limit code is tried and true, and if it isnt working, it is a good bet the car may not be running off the chip at all..

is datalogging working? i dont think i saw an answer to that question, but if it isnt, or freelog or whatever is not connecting to the ecu, then the serial interrupt handler isnt present on the chip, and therefor you are running a stock program, which may also explain why you are seeing rich idle and lean top end.

thats all ive got, there is just way too much strange stuff for it to be something crome did.

 

Datalogging works, the car does respond to the tune just not correctly... Like I said, it does take from the high cam maps as it should it seems as though its taking mostly from the low cam.
The rev limiter worked last year but only spontaneously started working after we gave up trying to get it to work.. But has since stopped working and refuses to work anymore. I've tried thinking of what may have been changed or altered to cause it to start working but couldn't come up with anything. Now lets say there is a hardware problem with either the wiring harness or something in the ECU, Where should I look? I mean what could possibly be wired wrong or shorting that would cause the rev limiter not to work? The launch control limiter works!! I would think that would work on the same principal.

 

yeah, it should work.. I guess you could look for burned traces on the ecu to see if the ecu itself is bad. i would definitely be trying another ecu though..

 

off the wall question, when did you upgrade to 1.5?
If you upgraded early, reinstall it with the version on tunewithcrome.com.
Ive seen strange things with a very early version of 1.5 that I pulled.

Crome doesn't follow good release version control. I have three different versions of release 1.4.9. The version of 1.5 that's on the site right now seems to be where he was aiming, it's reasonably stable.

Also I've seen revlimiter issues in the past, rebuilding the bin seems to always fix it. No idea why they pop up.