someone posted a while back something like if i tune for 14psi, the hondata will also tune all psi levels leading up too that 14psi... so the question is..

if i have my hondata tuned for 25psi on the dyno..perfect 12.5a/f all the way across..

if i only run 12psi on the street with that program, will it give me a perfect 12.5a/f all the way across @12psi daily?? or will it give me the fuel id need as if i was running 25psi, making me run piggggg *** rich @12psi? thanks alot..really needa know this

 

also what about timing retard??does it act in the same way???does hondata have timing retard for boost like the msd btm??or wouldi use aseperate unit for it..like the msd btm?

 

Your a dumb *** hehe j/k.I think hondata has its own built in ignition timing stuff and i think you will run hella rich because you have a map for 25psi of boost but your only boosting 12psi.Its gonna rich cause the ems thinks your running 25psi.

 

It depends how how good a job your tuner did. He may have tuned for a 12:5 AFR/25psi/8000rpm. But 12psi/8000rpm is in a different section of the fuel map and he may have left those fuel values alone. The only way to check it is with a wideband. Your timing should be ok for 12psi, but then again you'll need to check your maps.

Bottoz

 

If you are properly tuned to 25psi, then you will be properly tuned for every boost setting in between, so yes, your 12psi will be fine.

 

I dont think so. There are different injector pulse widths for 25psi @ 8000rpm as compared to 12psi @ 8000rpm.

Bottoz

 

ye ai hear it interpolates the values, but i dont see howit can , im curious about this also .
i was just gonna make 2 diff chips with 2 seperate tunes on thme . one for streets and one for track .
but thtas a pain in the as i would like for it to self adjust with the diff boost settings.

 

sigghhhh.. I never said that the injectors would behave the same at the same boost/rpm... your Hondata maps are based on rpm v manifold pressure (yes and other variables). If you are at 12psi at 8k rpms you are taking inputs from your map in a totaly different area than if you were running at 25psi at 8k rpms. Check out the Hondata website for just some examples of what the fuel/timing maps look like, then you'll understand.

I'm sure I'm not explaining this very well....

 

yea, i've been wondering about this topic a lot too.

i've been riding a lot in my bud's supra...& he's got the greddy Profec-B boost controller. & you can go between hig & low boost settings & the ecu will adjust the fuel & ignition maps accordingly, since its using a maf sensor.

but does the hondata have different fuel maps according to the boost it reads...if so, you've have to have it tuned for every boost setting you're plannign on running...& that would be some major dyno time...

 

It all depends on how it was tuned. If it was tuned at the max boost level only without tuning the increment boost level, then lower boost level might not have the correct A/F. It's the same thing like when only tuning for boost without tuning for part throttle.

 

Hondata systems have columns on their maps for 4, 8, 12, 18, 24 and 28 lb of boost. Boost points in between are calculated by the computer.

Have your tuner tune your car for 12lb 18 lb and 24 lb. You will only need one program for both.

 

What if you wanna run C16 for a race setting around 20 lbs. and pump gas for 15 lbs. Would you still go with one program?

 

this is a good topic. keep the info coming

 

You can still use same the map. Do the tuning on the lower psi levels on pump gas, then put race gas in and tune the higher psi levels. Its not rocket science, one map can cover it all since the ecu interpolates. Its the same deal with the partial throttle maps, the ecu interpolates between data points. Its like saying that you would need to have the ecu retuned when you drive at different vacuum points in partial throttle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bottoz &raquo;</TD></TR><TR><TD CLASS="quote">I dont think so. There are different injector pulse widths for 25psi @ 8000rpm as compared to 12psi @ 8000rpm.

Bottoz</TD></TR></TABLE>


Yeppers. Not only that, but the % efficiency of the compressor for said turbo is going to be drastically different at 25 psi compared to 12 psi. SO, you have to tune all the boost maps, which should be done anyways as the transision to 25 psi would have a hole in it.

 

Good infoormation!!