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Timing on a d15b7

2.9K views 9 replies 4 participants last post by  FestiveErode  
#1 ·
I have a mostly stock d15b7 (just i/h/e for now) on a chipped p06 ecu. I have my distributor timing set to stock using the stock tune (not on any tune I made, on the tune that came with the stock ecu) following the repair manual. I was just wondering if I could get a ballpark for timing numbers at full throttle between 2000-7000RPM. I use HTS and I got a base map through HTS and went off of that. I have my AFR dialed in throughout the whole RPM range at all throttle positions and now I'm just curious what to set timing at. Currently I'm running 22 degrees after 3500RPM at full throttle. I can post pictures of my current timing table if that will help any of you. Not expecting exact answers, just some insight on some round about numbers.
 
#3 ·
This is very helpful thank you. I did bump it up from 22 degrees to about 24 degrees @7k RPM and it richened up quite a bit. Any idea of why this would happen?


Would it be possible for you to send the full graph of timing tables for both? Would be great to have something proven to base my tune off of. Thank you!
 
#4 ·
pay attention to column 5 and around 3000 rpm. where I was getting 53 mpg US on E0 boat gas as well as put 121 whp down on a Mustang dyno.

I just took what I knew about V8 timing curves and playing with springs and weights and had a local tuner translate it into 1's and zero's....

Those are the graph's I screenshotted years ago when I was messing with CROME viewer....
 
#5 ·
If it is 100% a bone stock d15b7 that is running great, find a 99-00 d16y8 factory exhaust manifold, leave it uncut/untouched, and run it. It will give you a bit more opportunity for more ignition timing, the d15b7 exhaust manifold will limit you.

The manifold isnt about max power, it is about letting the engine breathe a bit better so you can run a bit more timing.

Plenty of opportunities in the future with very easy and basic parts can get you beyond 130whp pretty easily. The 1.5 engines benefit from a decent rotating weight difference, and a bit of creativity allows a TON of power.


Highly recommend you find some factory K series fuel injectors and clips/wiring, and run those (junkyard, ebay, amazon, beware knock-off's)

Or the cheapest, easiest to find that adapt very well are 01-05 civic d17 injectors. They need height adapters, but they can electrically plug and play as 96-00 civic injectors, so search for those plug adapters.

Once you have modern injectors, you will find EVERYWHERE on your fuel mapping will need a change. IT is just that huge of a difference going from dinosaur single hole injectors to basic 4 hole injectors.
 
#7 ·
I like FIC. Here's their Honda offerings:


They have 3 offerings in the size range you're looking at: 445cc, 525cc and 650cc.

Use their injector sizing calc to figure out which size you need to reach your power level.


You pick injector size based on your target power level and intended fuel type. Your HP target will be a certain Brake Specific Fuel Consumption value for certain fuel types. You need to be able to flow that amount of fuel in order to reach your power level. Use the calc, it will tell you what size you need.
 
#8 ·
Thank you, you all have been a big help! I do have one more question for you though: I’m now running 26.5 degrees of timing at 7000 RPM (which is where I set my limiter) does this seem a little retarded for 87 pump gas? ps. I don’t hear any spark knock and I’ve been regularly checking my plugs for signs of detonation and I don’t see any signs. Then again, I’ve never heard spark knock in real life before.
 
#9 ·
I have a set of ID600's. Somewhere in my listings is pictures and such, thoguh it might have been deleted.

I personally have not ran them, but I think I bought them lightly used. Dwell data is somewhere.
 
#10 ·
Thank you for the offer but I’m not interested. I prefer to buy really nice brand new stuff, just works way easier that way plus it’s future proofing.

I like FIC. Here's their Honda offerings:


They have 3 offerings in the size range you're looking at: 445cc, 525cc and 650cc.

Use their injector sizing calc to figure out which size you need to reach your power level.


You pick injector size based on your target power level and intended fuel type. Your HP target will be a certain Brake Specific Fuel Consumption value for certain fuel types. You need to be able to flow that amount of fuel in order to reach your power level. Use the calc, it will tell you what size you need.
Thank you, I took a look and found out I want some 625CC Injectors. I’ll order them in probably a couple months. Got some other things to buy and save up for.

Hi just an update for you all who have participated (I can’t thank you guys enough!) I’ve spent some time wrenching on the car and tuning it and I’ve come to something pretty conservative for now. This tune up doesn’t spark knock and I cannot find any signs of detonation on all of my spark plugs. It also sits happily at 12.8 AFR at full throttle from 2000 to 6500 (6500 is my limit for now.) I put some better quality pump gas in it just to be extra safe. Do you think I could run some more aggressive timing and leaner mixture? Would it make a noticeable difference if I did? Once again, thank you all for your replies, you have been a big help.
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