-
Here is a little more information on the Honda timing re-cuve:
After Endyn's first test of the Ultra, Larry made a suggestion about adding a programmed advance/retard curve to the unit. He knew I had already developed similar software for some of our Miata and Subaru applications, and asked if I could add it to the new unit.
It took me a couple of all nighters over the Christmas weekend. Just before I shipped it back, I thought of another cool thing to program in: Switches 3 and 4 select 2?, 4?, 6?, or 8? of programmed advance/retard. He loved that.
The new curve retards gradually as the RPM's increase. It maxes out in the mid range, stays there a while, and then re-advances gradually as the RPM goes on up.
The amount of RPM retard is also modulated by vacuum. No retard is allowed if the vacuum is greater than 10 in. Hg. Full amount if the vacuum is less than 3 in. Hg. Proportional amounts in between. Natch.
Larry did some quick tests on his type R last week in 40? weather. We should be hearing more from him this week. Don't know what boost he was running, but he likes the way it works.
He got brave and bumped the initial timing up to 15?. He had the Ultra set to pull a small amount of boost retard, had the programmed RPM retard set to pull 6? max, and he did see the knock retard lights flicker on and off.
With this amount of control, I don't think we'll have to worry about spending thousands of hours on the dyno optimizing the curve. Each application is going to be a little different, anyway, so whose car would we pick to optimize for?
-
Thanks for the info guys. So I have 290cc injectors.
-
John, what is retail pricing going to be on the newest J&S unit?
------------------
1998' 4dr GSR, 8psi JRSC w/hand ported plenum, 320cc injectors, Cartech adj. FMU, Walbro HP fuel pump, TPS trick in the works, valves set to .005i/.006e, MSD BTM, B&M CommandFlo regulator, stock intake w/ITR "cool air" resinator, Greddy sp exhaust, Tokico Illumina 5-ways, ITR springs, Skunkworks 22mm rear swaybar(removed due to mount torn out at present), ES motor mounts and front swaybar bushings, 205/50WR/15 Kumho Supra 712s, KVR Carbon Fibre pads, Super blue dot 4 brake fluid, B&M fuel pressure gauge, Autometer sport comp A/F gauge in dimmer location
...
YLW 00' Type R #00-1011 with "special tuning" and 143db triple air horns
Honest officer, I had no idea how fast I was going...the speedometer only gos to 150...
-
If you get the new ultra safeguard you'll also get the MSDBTM and JRBTC features, so it'll actually save you money.
------------------
Mods
-
The stock injectors on my 1994 GSR are 240cc. I am considering running 310 cc (saturated) injectors with 8 psi boost.
-
H22A injector sizing:
'92-96 H22A: 330cc
'97 and up H22A: 290cc
I agree with Holden on your parts list.
Basic blower kit
upgraded pulley
GSS-342 fuel pump
Cartech FMU
JR BTC
Autometer elec. fuel pressure gauge
Boost gauge
A/F gauge or EGT gauge
Also, I think that larger intectors are a really good idea... keeping fuel pressures to a lower peak reduces the strain on the fuel pump and eliminates some inherent fuel flow characteristic problems that are normally experienced above 90 psi.
As for the J&S... I have not tested a new design yet, however, I understand that it now comes with some type of boost sensitive retard capabilities. As for having a re-mapped timing curve... unless John has tested a Jackson powered GSR or Civic, I do not see how his curves could be optimized for this application like the BTC is. In any event, John makes an excellent product and his continual advancement of the piece is commendable.
I agree with Greg: there is no substitute for good tuning...
------------------
'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph
-
Hey 1994GSRFL...
You are close. The injectors are 235cc in the '94 GSR. Running 310's is fine, however, you need the PEAK AND HOLD (low impedence) type. Your ECU will not run the newer type injectors well... and you may eventually burn up the injector drivers in the ECU. Let me know if I can be of any help.
------------------
'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph
