RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
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From: Greenville, SC
RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
For comparison purposes k20a2's with stock motor, stock IM, I/H/E on our dyno have made between 185-191whp (tuned).
This setup belongs to Barnie from Hickory who brought his RSX-S earlier today for a complete partial throttle & WOT tune.
RSX-S - k20a2
Toruku - street cams (stock valve springs)
RBC Intake Manifold
DC Race Header (designed for mid-range)
3" exhaust > 2.25 or 2.5" exhaust towards the end (customer didn't necessarily enjoy the sound of the 3" all the way through)
K-pro
93 octane
Vtec was set at 4800 rpms. It would of actually liked it around 4200 rpms but there wasn't enough oil pressure to consistently engage vtec at that rpm. We like to be practical in everything we do and more power at the expense of safety is not something we do.
After tuning all 10 cam angle maps, this is what we were able to safely get out of this setup:
We usually show charts with a smoothing of 5 (industry standard) but tune with a smoothing of 3. Somehow, I overlooked that when downloading the file and just now caught that after leaving the shop. Ohh well.
***EDIT / UPDATE 11-12-09***
Barnie was in today for a slight tweak on his tune. If you'll remember, he was going to clean his VTEC Solenoid screen, and then come back in to try to lower his VTEC engagement point, and play with the cam angles a little bit.
Here is his new chart:
and here is a comparison of all three:
The light blue chart is Barnie's base run from another tuner. The darker blue chart is the tune that we provided to him on last Saturday.
The red chart is the tune from today, and is just from lowering the VTEC engagement point and adjusting the cam angle. While there isn't a peak power gain, the power under the curve is huge, and should make for an all around faster car.
This setup belongs to Barnie from Hickory who brought his RSX-S earlier today for a complete partial throttle & WOT tune.
RSX-S - k20a2
Toruku - street cams (stock valve springs)
RBC Intake Manifold
DC Race Header (designed for mid-range)
3" exhaust > 2.25 or 2.5" exhaust towards the end (customer didn't necessarily enjoy the sound of the 3" all the way through)
K-pro
93 octane
Vtec was set at 4800 rpms. It would of actually liked it around 4200 rpms but there wasn't enough oil pressure to consistently engage vtec at that rpm. We like to be practical in everything we do and more power at the expense of safety is not something we do.
After tuning all 10 cam angle maps, this is what we were able to safely get out of this setup:
We usually show charts with a smoothing of 5 (industry standard) but tune with a smoothing of 3. Somehow, I overlooked that when downloading the file and just now caught that after leaving the shop. Ohh well.
***EDIT / UPDATE 11-12-09***
Barnie was in today for a slight tweak on his tune. If you'll remember, he was going to clean his VTEC Solenoid screen, and then come back in to try to lower his VTEC engagement point, and play with the cam angles a little bit.
Here is his new chart:
and here is a comparison of all three:
The light blue chart is Barnie's base run from another tuner. The darker blue chart is the tune that we provided to him on last Saturday.
The red chart is the tune from today, and is just from lowering the VTEC engagement point and adjusting the cam angle. While there isn't a peak power gain, the power under the curve is huge, and should make for an all around faster car.
Last edited by Spent; Nov 12, 2009 at 04:57 PM.
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From: Greenville, SC
Re: RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
Good question. That's what we'd rather do but regional dynos use STD so that's what we stick to for comparison purposes.
For the record, the chart is scaled exactly the same way with either method.
SAE#: 214.77 / 152.34
For the record, the chart is scaled exactly the same way with either method.
SAE#: 214.77 / 152.34
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From: Greenville, SC
Re: RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
We asked Barnie to clean his vtec solenoid since this is the usual suspect. He's bringing the car back to us free of charge and we'll see how much more she'll pick up down low.
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From: Greenville, SC
Re: RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
Guys, the following quote is from the following thread on k20a.org.
RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum
Just thought it would be something some of you guys who may be getting into tuning may appreciate. I'm GT35RK20 by the way.
First, keep in mind we are dealing with i-vtec (adjustable cam angles) and not a standard vtec motor who's vtec engagement point is as straighforward to specify as anything else.
It's really quite simple if you knew how the different cam angles cam into play with these particular cams and the characteristics of the DC header. DC headers show up as a "bump" in the midrange and then falls back in line. I know because I've seen this before on other K20's, including my own before I boosted.
The low cam likes the 30 degree cam angle for maximum power, the high cam likes 50 degrees right where vtec engages. A compromise has to be reached between how smooth the curve is vs power, etc... Keep in mind that it takes the cam angles .1 seconds for every 10 degrees of change and if you couple that with a vtec engagement where oil pressure is already a greater factor, can contirbute to a harsh engagement/noticeable dip... Hence, a compromise has to be found.
Changing it to 40 degrees on the low cam right before vtec engaged with a 50 degree cam angle would cause a loss in power of 10-12whp but it would of had a smooth transition and vice versa.
We played around with transitioning the cam angles best to gain the most power but still have a smooth of an engament as possible. What you see before you was the best compromise between practicality and power. Sure I could have made it even smoother but like I said before, doing so would of been at the expense of power due to how the cams respond at the different cam angles and thus a best case scenario compromise had to be met.
RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum
Just thought it would be something some of you guys who may be getting into tuning may appreciate. I'm GT35RK20 by the way.
First, keep in mind we are dealing with i-vtec (adjustable cam angles) and not a standard vtec motor who's vtec engagement point is as straighforward to specify as anything else.
It's really quite simple if you knew how the different cam angles cam into play with these particular cams and the characteristics of the DC header. DC headers show up as a "bump" in the midrange and then falls back in line. I know because I've seen this before on other K20's, including my own before I boosted.
The low cam likes the 30 degree cam angle for maximum power, the high cam likes 50 degrees right where vtec engages. A compromise has to be reached between how smooth the curve is vs power, etc... Keep in mind that it takes the cam angles .1 seconds for every 10 degrees of change and if you couple that with a vtec engagement where oil pressure is already a greater factor, can contirbute to a harsh engagement/noticeable dip... Hence, a compromise has to be found.
Changing it to 40 degrees on the low cam right before vtec engaged with a 50 degree cam angle would cause a loss in power of 10-12whp but it would of had a smooth transition and vice versa.
We played around with transitioning the cam angles best to gain the most power but still have a smooth of an engament as possible. What you see before you was the best compromise between practicality and power. Sure I could have made it even smoother but like I said before, doing so would of been at the expense of power due to how the cams respond at the different cam angles and thus a best case scenario compromise had to be met.
Last edited by Spent; Nov 13, 2009 at 02:46 PM.
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From: greenville, sc, USA
Re: RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
Good job huebert.
From personal experience these guys do excellent work. Very patient in tuning and give you the time of day you pay for (which is a flat rate). TDC honestly has the best honda tuner in my opinion in the carolinas and georgia area.
The dyno I believe is also pretty conservative on #'s.
From personal experience these guys do excellent work. Very patient in tuning and give you the time of day you pay for (which is a flat rate). TDC honestly has the best honda tuner in my opinion in the carolinas and georgia area.
The dyno I believe is also pretty conservative on #'s.
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From: land of the sheep, home of the hypocrite
Re: RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
Nice post, thanks for the plots and info on the setup! What did the cam angle maps end up looking like? Did you do any composites?
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Re: RSX-S: Toruku Cams & Bolt on's - Pump Gas Dyno Tune
^ It liked the 30 degree cam angle on the low cam. It liked 50 degrees right at vtec on the high cam, then 40 pass 5.5k rpms and then 30 right past 8krpms.
Yep, it was a composite map with the 0 (a.k.a limp mode angle),10,20,30,40,50 cam angles since Hondata doesn't have a basemap for these cams.
Just got home from the shop.. This is what we tuned today.
https://honda-tech.com/forums/forced-induction-16/b16a-borg-warner-s200-pump-gas-dyno-tune-2680531/
Yep, it was a composite map with the 0 (a.k.a limp mode angle),10,20,30,40,50 cam angles since Hondata doesn't have a basemap for these cams.
Just got home from the shop.. This is what we tuned today.
https://honda-tech.com/forums/forced-induction-16/b16a-borg-warner-s200-pump-gas-dyno-tune-2680531/
Last edited by Spent; Nov 13, 2009 at 04:37 PM.
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