Tuning for Bosch 210 lb/hr Injectors (0280158829)

[Killer95GT302]

Ive had the car in the garage tuning idle and just revving thru the RPM range...I was having a built 8.8 getting done and now just waiting on driveshaft so I couldnt take it out to tune on the road.

After I scaled the tune, both with my old injectors and the new Bosch injectors it was a bit lean, I dialed in the low slope to get it back to stoich.

I hope to have driveshaft in this week so I can put it more testing behind it, but just idling and revving the engine runs smooth. If I have issues under load Ill send them out for flow testing.

BTW these arent knock offs and appear to be legit bosch from the source I mentioned above - others have had good luck from them too.

[Killer95GT302]

I was finally able to get out on the road with the new setup. Car is responsive in part throttle driving and runs good, I haven't taken it WOT yet though.

I'm still figuring out fueling though - ever since scaling my tune it seems a bit lean, I'm not sure if I should mess with injectors or MAF curve to fix that - I've started with just adjusting the low slope to get me close since that's mostly where part throttle driving will be with these. Idle and really low throttle seems OK but in other areas I'm seeing I could be off as much as 10% still.

I've noticed a condition with these injectors when it enters DECEL mode, it pegs the lean adjustment limit of 1.25 lambda and trips the CEL. Not sure why this is the case. I want to tackle getting the majority of driving conditions sorted out and then I'll look at DECEL

Did you happen to run into DECEL issues like this?

[decipha]

No my decel is usually spot on.

[Killer95GT302]

Getting closer to dialing it in, but had to rape the ID2000 data more than expected, in the area of 15 to 20% smaller slopes to get the AFR from lean to stoich. I also figured out my lean tip in and decel issues were related to air manifold volume not being set right... bumped that 20% and it really cleaned up tip in response.

Curious if you use the ID2000 data and if you've had to adjust it that much - supposedly their data is spot on. If not then maybe these injectors have too much variance. Either way I'm going to get them flowed to see where they are at.

I've taken it up to half throttle now and surprisingly it feels like it drives better than with the 80s, but still needs some tweaking.

[decipha]

I use my own data.

Attached.

[Killer95GT302]

I should have known you would :)

Well those slopes are much closer to the ID data than mine are, I guess I got some investigation to do - will be looking at the MAF curve and getting injectors tested. Possibly introduced a vacuum leak while my car was under surgery.

I really appreciate you sharing that info!

[Killer95GT302]

OK big update - Found a few things that were affecting my ability to tune this thing

1 - I did have a vacuum leak that I found and plugged under the upper manifold where a vacuum hose connects.
2 - On top of that I had the injectors cleaned and flowed - he said these are indeed legit Bosch 210s, however, somehow I already got some black sediment in there that was able to get cleaned out. I'm not sure where this came from, possibly didn't have a fine enough filter from the tank but the lines should have been clean. I threw on a 10 micron tank filter and hoping it doesn't happen again.

After fixing these things, redoing my eec settings, things have become a lot easier and are now acceptable where I can tune it at the track. See below for results from the injector flowing after cleaning - before cleaning the numbers were slightly lower, and slightly wider margin but nothing crazy.

I did notice that since scaling the tune, minor tweaks make a much bigger difference than unscaled but I guess that makes sense.