need some insight, I am going to be installing my turbo before thanks giving, but I am doing it in small sections at a time since this is my daily driver. basically all I have left to bolt on is the turbo, mani, injectors, oil lines, dp, intercooler and pipes, wategate, bov. basically the heart of the entire turbo project. I have already done extras like, installing the bost controller, 255 walbro, all gauges, hondata, radiator swap to a 92 civic all aluminum.

what I need to know so that I can cut down on down time the day of the install is....
1. can I swap the injectors (450cc dsm) and sparkplugs (bkre7-11), then tune the hondata as naturally aspirated with the bigger injectors and get the idle smooth as well as partial and full throttle. I am thinking it'll work since at idle and really low throttle the car doesn't see boost even with the turbo.

and

2. if I can tune it this way does that mean when the turbo goes on I have to retune totally or will the extrapolate for boost work? this is all street tuning, with aem wideband uego gauge style.

thanks for the help

 

Sure, you can throw the injectors & hondata on....

Your map sensor is not going to see boost when your running n/a so, you just don't touch the boost sections of the hondata boostmap until youre boosted.

 

Yea you can but the a/f might change when you put on the turbo

 

I figured it should work since the injector multiplier changes with the 450cc to almost half, and since the hondata tuning manual advises to tune unboosted first then tune boosted this should be the same thing. the a/f may change but only when the psi or vacum does, whether its -10 vacum boosted or n/a its still -10, the only diff is at what rpm. I intend to go ahead and set the target a/f to what I want when it's boosted, since the turbo goes on next week, and I am currently seeing 11:1 and 13:1 as my part throttle and wot. thanks for the help just wanted to confirm my line of thinking since this is the first one I've tuned.

 

Yes you will have to retune it when you get the turbo on just to make sure your a/f is safe.

 

I figured the extrapolate would get the ball park for boost, but since the manual says to fine tune to smooth out any spikes or dips, I kinda figured a little tuning would be needed but not like a full tune from top to bottom.

 

ok did the injector swap and I had to reuse the injector seals (the ones at the intake mani side) because the ones honda sold me for a 99si were 3mm shorter than what was on there. also was a tight fit since the tip end of the injector was 2mm bigger than stock, but I used a little oil on them and used the fuel rail bolts to pull them into place.

Burned a new rom with the 450cc set in the injector multiplier, and the car fired and ran as good or better than with the stockers. I couldn't tell the diff at idle, but the ass dyno says I added a few hp I know its in my head and it didn't really add to the hp but its kinda like a placebo.