So I built another B20VTEC, this time using a GSR crank, rods and some 85 bore YCP pistons that I got from FJ Distributors. I'm using a head that my buddy Huy at Inline ported for me a while back, supertech springs/retainers, custom ITB's, etc...

The last two motors I had on ITB's used the MAP vs RPM table for fuel and ignition on Crome. I noticed that some people use the ITB tools to switch over to maps that use both MAP and TPS signals. I'm thinking it may be easier to use the TPS values for the whole table for tuning this setup. Has anyone tuned like this?

PS I'm not going to buy anymore tuning software, so don't try to get me to buy Neptune or Hondata. I like Crome Pro since I can burn chips whenever I want, and it does a great job for me. I have too many hondas myself along with my friends that I can't justify buying a dozen licenses for someone else's software. What I'm looking for are ideas on what disadvantages a TPS only map would have.

here is a pic of what I want to try on the columns:



thanks for any input

 

Doing a full TPS tune is the best way to go. I wish i would have went this route since my first ITB build.
Just make sure that you get your closed and WOT voltages dead on if you're using an aftermarket TPS. I had a hell of a time getting my Jenveys dialed in.

 

thanks for the advice. I'm running a stock Honda TPS that I can adjust, so hopefully it will work well. I can also change the voltage range in Crome if I'm not mistaken.

 

well I got started tuning the car and decided to have a mixture of columns with some pressure and some throttle angle based. I've got the idle to idle around 600-700 mbar, so I left the first two columns for idle. It made sense to me to leave them with the exact same values for now, as the idle seems to be more consistent this way. I left the 100% throttle column numbers at what my old B20VTEC was tuned at with a change in the fuel multiplier since this time I'm using 440's instead of 310's. One thing I notice is I have a weird thing going on with the fuel curves on the low TPS angle maps. I'm not sure if this is due to the tip in needing to be adjusted or what.

anyways, here are the low cam fuel and timing maps. feel free to give me some constructive criticism. btw this motor is being run on 93 octane pump gas here in TX.

 

pro2 cams?

 

Blox C's which I think are the same as Jun 3's

so far I haven't even turned on the VTEC, as I have only had enough time to mess with the low cam maps so far

 

I thought you didn't want to mess with MAP-TPS crossover?
Couldn't get it to work properly?

 

Im curious about the low cam fuel map ...

 

the TPS reads 0 with no throttle and I didn't want to reclock the tps. So I decided to do the map with both both. Car is running good this way so far.

 

Map is a easier way..just a fyi.

When i had TWMs thats what i used.. i found it was a better overall tune vs tps.

 

I started it up on a MAP tune, and the problem I had was that some partial throttle driving has such low vacuum numbers that it was in the full throttle part of the map. If I had it running well at partial throttle it would go lean at wot.