travishoward

question answered, thanks everyone!

travishoward

also have toda adjustable cam gears if that even matters, haha, and a/c and p/s

94EG8

Just get the P28 chipped with a GS-R basemap and get it tuned. You could chip the P72 (assuming its OBD1) but the end result will be the same and your P28 is already socketed.

travishoward

well, someone wants to buy my p28 for thier single cam setup for 150
and i already have a p72, so i could just use $80 of the 150, get the p72 chipped and socketed from phearable, and still have money left over
it wont make any difference if i run the p72 chipped or the p28 chipped?
the p28 is obd1 and the p72 is obd2
i know ill have to cancel out the knock sensor, and o2 for it to run right, but what else?

and what should i have everything set to?
my buddy said i should rev it to 8k when i shift, but idk if thats too high or too low, safe wise as well

94EG8

OBD2 ECUs can't be chipped (sort of a lie, they can be, but no one does it) So that P72 isn't much good to you. You could pick up a P06 though and get it chipped and converted to vtec and it will be functionally equivalent to a chipped P28.

travishoward

well, i guess i could also just sell the p72 for like 100 and use that to get the p28 rechipped then use the other 20 for gas, haha

now that, that, is settled, how about the settings

93egSLEEPER

I would definately get the P28 rechipped and sell the P72.
I would set the P28 to GSR factory settings, or like said before get the GSR basemap and add the 2 step in at whatever RPM you like. My guess would be around 5k. I would not have the rev limit set above 8500. Let the tuner do the rest.

travishoward

its just that phearable is very impersonnal, so i wanna make sure i tell them exactly everything i need to to get the best out of this setup
i know i need to get the o2 and knock sensor removed, and tell them to set it up for the single butterfly valve in the skunk2 mani, because gsr's run 2 stock and without the tune its causing me to lose power at low rpms

id rather get it dyno tuned, however i dont have that kind of money yet

93egSLEEPER

Why do you want to delete the o2 sensor? Knock sensor and evap yes but o2 no. You also wont need the crank position sensor.

Are you running a Skunk2 IM? tell them that they will get it changed for you. IMO best thing would to be just get the basemap and have a local guy tune it for you...only way you will ever get spot on and the most out of your setup.

94EG8

A lot of tuners disable the O2 sensor and run in open loop mode. OBD1 ECU wont look for a CKF sensor chipped or not.

Definitely do this, a good tune will make all the difference.

93egSLEEPER

What is the difference in doing a o2 disable and o2 wideband tuning? I guess I understood the concept of the o2 sensor effecting the performance and emissions of a vehicle in regards to the tune.

travishoward

well i know when i ran the p72, the o2 sensor threw a check engine light and it bogged like crazy, but when i put in the chipped p28 that disabled the o2, it ran perfect, minus the loss or low end torque from the skunk2 intake manifold
i have no cels now with the p28, but thiers an o2 code with the p72

travishoward

should i rev it to 8k? ad have the limiter at 8200?

93egSLEEPER

Stock redline for the GSR is 8k, but you have the S2 manifold so i would rev it to 8200 to 8300, limit it at 8500. You should see a better and higher powerband with that IM and it should still make power up there. Get some ITR cams and your in business.

travishoward

thats what my buddy is running, but without a tune, it was door to door with an rhd s13 sr20det on 9psi

someone told me that i need to use a gsr tranny to get the real power out of my engine? hes says the gears are too short for it with the b16 trans

i lost to a 3.8l genesis by a car and a half, but i need a tune, 2'1/2 exhaust, and i need to time it perfect, with the dizzy too

travishoward

is it safe to rev to 83k?

93egSLEEPER

I dont know who told you the GSR tranny is better for "real power" they are mistaken. If its so much better then why does the ITR use shorter gears? Actually the same exact gears are in B16 trannys just a different final drive.

You should be fine to 8300, but i def wouldnt go above that, you wont be making power anymore.

travishoward

thats what i was thinking, but ima need a new tranny soon, second is going out forsure, and 3rd has started to grind sometimes. i want an itr trans, but theyre like impossible to find


so knock sensor, o2 sensor, crank position sensor, and evap sensor are all i need to cancel out

tell them to program it for the obd2 gsr basemap, with a skunk2 intake manifold and lightweight flywheel? with b16 trans

should i run bigger injectors and a walbro 255? im not sure if its in the car already or not, but if not, should i?


2step at 4k
redline at 8400
shift light at 8300
vtec at 4500? or 4800?

93egSLEEPER

vtec shuldnt engage til about 5800

travishoward

isnt it better to have it engage earlier?

94EG8

No. The way vtec is supposed to work is it should be a smooth transition. If you can feel vtec crack, kick or pop you're loosing power just before vtec. Unless you really know what you're doing leave the vtec engagement point alone.

93egSLEEPER

NO.

Engaging too early will create a loss in power and make Vtec less effective and efficient.
Engaging too late will create the same problem.
Stock B16 and ITR vtec from the factory is set at 5800.
If the GSr didnt have the "dual vtec" butterfly setup it too would engage at 5800.

travishoward

ive read in other forums, that its good for it to be lower, and some say its good to be higher
they all seem to say that stock isnt good enough

you seem to know what youre talking about, and i obviously dont, or i wouldnt be asking
but i would like more opinions

should i just let phearable set it themselves? cuz when they did with my p28, they set it to 4800 for a jdm d15b with a y8 intake manifold and ls throttle body...

travishoward

and is the "pop" the same thing as hearing it? because i dont feel it much, until high rpms afterr it pops, but not right away
however, when it does kick in, its ridiculously loud "mmmmmmmmmBBBBBBBBBAAAAAAAAAAHHHHHHHHH"
even if im not flooring it

travishoward

"no necessarily. Vtec can usually be set lower on most the DOHC vtec models because vtec was a honda market. It's something they used to sell their cars. If vtec was perfect from the factory, you wouldnt be able to feel it. If you are selling a car for its vtec, you better let people feel that its there. So you set it a little higher so that the low cam power drops off, then the vtec cam switches over and creates a huge power increase. That drop in power from the low and and surge of power with the high cam is what you "feel". With fine tuned motors, you dont feel the engagement point because it is set at the low cams peak power which makes up for the discrepancy in power at the vtec crossover in stock form.

this is just the typical case tho. Not all cases. Different intake and exhaust modifications will change where vtec needs to be.

Beyond that, you dont want to just change the vtec crossover and not make the respectable changes in fuel and ignition (or just fuel if you dont have proper engine management)
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