Hondata tuning for B16A
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Hondata tuning for B16A
Hey guys,
I just finished building a B16A with JDM 4-1 header, intake, 2.5" exhaust, CTR intake cam, ITR exhaust cam, valve springs, retainers, and adjustable cam gears.
The car drives great until VTEC engages at around 5,000 RPM, at which point the car loses power and studders quite a bit. Then, at 6,000 RPM, the power comes back and pulls well all the way to redline.
Currently, I have Hondata installed, but still using the stock maps for now until I get it tuned at Secret Services.
Base fuel pressure is set at 56 psi (without vacuum), which equates to about 48 psi with vacuum. Running with 38 psi (with vaccum) fuel pressure still ran the same way.
TPS voltage is 0.500 V at closed throttle and 4.35 V at WOT.
Ignition timing is set at 16 BTDC.
I think that this weird behavior in the powerband will disappear once the fuel pressure is adjusted and the new Hondata maps implemented. Does this sound right?
Thanks a lot,
I just finished building a B16A with JDM 4-1 header, intake, 2.5" exhaust, CTR intake cam, ITR exhaust cam, valve springs, retainers, and adjustable cam gears.
The car drives great until VTEC engages at around 5,000 RPM, at which point the car loses power and studders quite a bit. Then, at 6,000 RPM, the power comes back and pulls well all the way to redline.
Currently, I have Hondata installed, but still using the stock maps for now until I get it tuned at Secret Services.
Base fuel pressure is set at 56 psi (without vacuum), which equates to about 48 psi with vacuum. Running with 38 psi (with vaccum) fuel pressure still ran the same way.
TPS voltage is 0.500 V at closed throttle and 4.35 V at WOT.
Ignition timing is set at 16 BTDC.
I think that this weird behavior in the powerband will disappear once the fuel pressure is adjusted and the new Hondata maps implemented. Does this sound right?
Thanks a lot,
Hatorator
Joined: Jun 2002
Posts: 0
Likes: 0
sounds about right.
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1997 Prelude, H23A1 VTEC
Items for sale:
H22/23 block and all internal parts
4 5th gen Prelude wheels, 16x6.5, 5x114.3mm bolt pattern
More stuff for sale:
https://www.tamparacing.com/forums/showthread.php?s=&postid=472993#post472993
1997 Prelude, H23A1 VTEC
Items for sale:
H22/23 block and all internal parts
4 5th gen Prelude wheels, 16x6.5, 5x114.3mm bolt pattern
More stuff for sale:
https://www.tamparacing.com/forums/showthread.php?s=&postid=472993#post472993
Tetris on a stick
Joined: Apr 2001
Posts: 389
Likes: 0
aren't the ctr and itr cams set with larger cam lobes for vtec? sounds like you could bump the vtec point up a bit also until tuned.
nevermind, you don't have a stage 4 do you?
nevermind, you don't have a stage 4 do you?
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Eat a live toad every morning, and that will be the worst thing to happen every day.
Eat a live toad every morning, and that will be the worst thing to happen every day.
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Originally posted by "Mr Self Destruct"
sounds right for now, seems like a rather safe setting. Might I suggest some larger injectors however?
sounds right for now, seems like a rather safe setting. Might I suggest some larger injectors however?
Is it also possible (for the time being), to increase the fuel pressure and tune from there to obtain the target A/F ratios? Or, are the stock injectors STILL too small, even with increased fuel pressure, to compensate for the increase in volumetric efficiency afforded by the cams and bolt-ons?
If going with 310cc injectors is the only way to get it to run right with this setup (and the Hondata), then I will have to talk my customer into getting them before getting it dyno tuned.
Lastly, is it correct that Honda injectors run at almost 100% duty cycle at WOT....and that is why we need bigger injectors?
Thanks again,
Tetris on a stick
Joined: Apr 2001
Posts: 389
Likes: 0
the problem with just bumping up the fuel pressure is that you are stuck with the setting, it can't vary like the curve would need it to. 310s will prb be fine for that application. with the hondata, john will build a map using 310s which the system will interpolate the nesc changes to run the larger injector, based on hondas original maps with the stock 240s. you could do it with the stock injectors and just bump pressure then use hondata to change the timing as well, but you are asking for injector failure on that.
when we had the blower on my ls, along with the jr boost dependant fpr, i saw pressures as high as 90psi, and had a basic hondata map with my 240s... no fine tuning vail when it hits like that
when we had the blower on my ls, along with the jr boost dependant fpr, i saw pressures as high as 90psi, and had a basic hondata map with my 240s... no fine tuning vail when it hits like that
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Eat a live toad every morning, and that will be the worst thing to happen every day.
Eat a live toad every morning, and that will be the worst thing to happen every day.
