Live Tuning Session!! Does VCT (Variable Cam Timing) actually give you more useable horsepower? We're about to find out! . ------------------------------------------------------- 00:00 Introduction 00:49 How VCT works on an SR20DET 01:43 Test Car Specs 03:07 Software walkthrough 05:42 Gear Position Setup 08:13 VCT off dyno run 09:06 VCT permanently on dyno run 09:29 VCT Tuning 11:52 VCT tuned dyno run 12:34 Final analysis
Please tune a VVL VE head on DET engine next :) Interesting to see some hard data on best times to switch intake and exhaust in a turbo application, there is much debate on the subject.
I’ve actually had my VVL s15 tuned at haltech and saw exactly this. Did one run entirely on the small lobe and one on high to see the switchover point and just made it changeover exactly where they meet in the middle
@@G.B yeah we did one run on the small for both and one on high for both. My changeover spot ended up being around 5500rpm but this would differ depending on engine capacity, cam choice, turbo choice etc etc.
Thank you for covering this in an easy to digest manner. My S14 has a similar setup and with this information, I'll be applying this methodology to my tuning strategy. Sharing your knowledge and experience this way makes owning a Haltech Elite 1500 one of the best decisions I've made for my car.
Would love to see an example tuning v cam on RB26. There's so little information about how much of a difference it actually makes outside of that one Best Motoring video from 20+ years ago.
Amazing explanations, as always! The S14 SR20DET has the same VCT setup as well, not just the S15. My S14 has it and it's a Zenki and works the exact same way.
@@mahinork Turbo is slightly different along with a few mechanical bits in the engine. But overall, the exact same engines. ECU may be different as well, but im not too sure. Anyone feel free to correct me!
Funnily enough, your optimised VCT dyno graph looks very similar to my own S15's! I've got a built engine with Tomei Poncams, Tomei cam pulleys and a GT2871R making 410hp and hearing Scott say how good these engines are is such a nice change from "SR20s are so unreliable"
Really enjoyed all your vids so far, great video. Just some suggestions for the SR engine family: SR16VE 130kw-Nissan Pulsar VZR (JDM), SR20VE - Primera P11(JDM),Sr20ve 150kw- Primera P12 (JDM)
Cheers mate! Very well explained and thorough. Please get a Toyota 4AGE 20 Valve (preferably Blacktop) in for the same VVT tuning. I'd love to see you tune that and get some pro tips from you ;)
This is super clear explanation. Same story with NA engines and variable air intake systems. But! can we have same video about VVT-i variable cams? and tuning the intermediate positinos? or such fine tuning can be skipped and on/off style applyed without much loss?
Haltech, on an SR20 since the CAS is on the exhaust camshaft, how to run a "VVTI" / HKS Vcam system ? (mechanical side apart) To my knowledge Haltech software need the position of the camshaft with the Variable cam system (not the nissan VTC style one, the true infinite one like Honda VTC). Do i need a full trigger/homing kit ? And put the homing on the intake rather than the exhaust cam, unlike OEM ? I know for a fact that RB26 with HKS VCAM run pretty much like a VVTI 2JZ, but i'm not to sure on a 4 banger.
I know some newer Toyota engines have the vvt gears fail if you use thick oil. The main reason people don't usually use vct on big cams is simply because of valve clearance. You need to keep the valves away from the pistons at all areas that the vct can reach. Certainly high comp it's a big issue. Turbo lower comp engines you don't need such big cams if at all anyway, so vct is obvious
Hi, Scott and Haltech! I have lots and lots of problems with my car but just wanted to throw out a question to you. Can a bad evap canister cause irregular engine running when the engine is cold? Like a rough idle(when cold)...
funny thing is ive been looking for something like this for months. in theory i can use this same thing to activate VVL minus the off condition, correct??
@@G.J.G.P. more or less.. but v-cam do variable not just on/off. stiill not using full 50/30deg if still using stock cam... btw hks source then enginered the vtc pulley itself from subaru engine
@@goodboy_aqee58 ok, thx. So variable. Ive read about the subaru thing. But still, the rest not. You still need the special cam with timing marks and special valve cover with oil feed and solenoid. So its not just the cam sprocket. So you have one installed? Was tuning complicated? And is the difference worth the money?
Wait since when can a stock bottom end sr20 make 380+ hp at the wheels This means that it makes 440+ at the crank I thought that stock sr20s can handle about 400hp at the crank
I think the main caps on stock SR’s are the issue, I think redsun Motorsport (specialise in SR20’s) said they can handle 450kw, because the main caps break at that power due to their design.
![5 Things You're Doing WRONG | Camshaft Selection and Tuning [#TECHTALK]](/img/1.gif)
Live Tuning Session!!
Does VCT (Variable Cam Timing) actually give you more useable horsepower? We're about to find out!
.
-------------------------------------------------------
00:00 Introduction
00:49 How VCT works on an SR20DET
01:43 Test Car Specs
03:07 Software walkthrough
05:42 Gear Position Setup
08:13 VCT off dyno run
09:06 VCT permanently on dyno run
09:29 VCT Tuning
11:52 VCT tuned dyno run
12:34 Final analysis
Kan u do vid like this on k24 153kw model
We should do a honda video together lol.
Try the same way but on the neo vvt head.
This high level of tuning and perfectly clear explanations is what I miss the most, if only we had a Japanese Based Scotty 😂
With the cloning technology advancing so quickly, who knows.....
@@haltech 😂
Please tune a VVL VE head on DET engine next :) Interesting to see some hard data on best times to switch intake and exhaust in a turbo application, there is much debate on the subject.
@@elitecol69 Never say never... I would also be very interested in this setup, as I've done it on B13s
I’ve actually had my VVL s15 tuned at haltech and saw exactly this. Did one run entirely on the small lobe and one on high to see the switchover point and just made it changeover exactly where they meet in the middle
@@jimm5091 did you just opt to change intake and exhaust at the same time?
@@G.B yeah we did one run on the small for both and one on high for both. My changeover spot ended up being around 5500rpm but this would differ depending on engine capacity, cam choice, turbo choice etc etc.
+1 on this plz scotty
Loving the S-Chassis episodes lately.
Cant imagine ever owning an SR20 but ill watch anything with Scotty in it!
dont worry you cant even afford one:)
@@theronbacev8030 I mean i could afford the engine, not the car the engine came in though
Had an SR20det in a Silvia I bought for $8k back in 2006. God how times have changed!
@@wedgett1 8k in 2006 was 20k today and the price of that car typically … just hard to justify 20k off a 30 year old Nissan
Thank you for covering this in an easy to digest manner. My S14 has a similar setup and with this information, I'll be applying this methodology to my tuning strategy. Sharing your knowledge and experience this way makes owning a Haltech Elite 1500 one of the best decisions I've made for my car.
Would love to see an example tuning v cam on RB26. There's so little information about how much of a difference it actually makes outside of that one Best Motoring video from 20+ years ago.
Thank you Haltech!
It's my bday today & I've got a S14a up here in Brissie!
Love the SR20DET ❤❤❤
My S14a has VCT Scotty, and Australian delivered
Amazing explanations, as always!
The S14 SR20DET has the same VCT setup as well, not just the S15. My S14 has it and it's a Zenki and works the exact same way.
Hej du!
I believe the only real difference between zenki and kouki/S15 sr20det physically is the coil pack size.
@@mahinork Turbo is slightly different along with a few mechanical bits in the engine. But overall, the exact same engines. ECU may be different as well, but im not too sure. Anyone feel free to correct me!
@@terranceaskew3165 Kouki S14 SR20DET is exactly the same as S15 SR20DET except the turbo. Zenki has a different ECU
@@obaapohjois-laosis4394 s15 sr also has larger injectors to match the turbo
Funnily enough, your optimised VCT dyno graph looks very similar to my own S15's!
I've got a built engine with Tomei Poncams, Tomei cam pulleys and a GT2871R making 410hp and hearing Scott say how good these engines are is such a nice change from "SR20s are so unreliable"
I've been waiting for this kinda info for ever.
Amazing info and video
Thank you!!
Awesome class Tuning Fork! 💪🏆
deffo trying this on my high strung Chevy Aveo 😎
Thank you! I finally understand how to tune the VCT on my rb25det Neo. Hopefully I can pickup some midrange.
Really enjoyed all your vids so far, great video.
Just some suggestions for the SR engine family: SR16VE 130kw-Nissan Pulsar VZR (JDM), SR20VE - Primera P11(JDM),Sr20ve 150kw- Primera P12 (JDM)
Cheers mate! Very well explained and thorough. Please get a Toyota 4AGE 20 Valve (preferably Blacktop) in for the same VVT tuning. I'd love to see you tune that and get some pro tips from you ;)
Legend!
I hope you get to show this same sort of demo with a neo vvl head.
Great explanation. ❤ Haltech. 💪🏼
I also hope they reproduce them. Definitely with vvl though. We need more of those around
What is the input name in the haltech dash so I can show vtec engagement on my ic7 please
Cam control.
This is super clear explanation. Same story with NA engines and variable air intake systems.
But! can we have same video about VVT-i variable cams? and tuning the intermediate positinos? or such fine tuning can be skipped and on/off style applyed without much loss?
Would love to know more about the Mitsubishi 2.4 Mitch engine
Can the Haltech elite control HKS VCAM as well? Can you do a demo of it taking advantage of the fully variable cam timing?
Haltech, on an SR20 since the CAS is on the exhaust camshaft, how to run a "VVTI" / HKS Vcam system ? (mechanical side apart)
To my knowledge Haltech software need the position of the camshaft with the Variable cam system (not the nissan VTC style one, the true infinite one like Honda VTC).
Do i need a full trigger/homing kit ? And put the homing on the intake rather than the exhaust cam, unlike OEM ?
I know for a fact that RB26 with HKS VCAM run pretty much like a VVTI 2JZ, but i'm not to sure on a 4 banger.
Is the vct an advantage in a race engine that is constantly over 5k. Probably not?
Great video.
Yea nah get s13 or better yet k powaaaa
Maybe not, but if you have the hardware it is free power and less penalty if the track or situation requires less then 5000 RPM
I’ve heard big cams will kill the vct though. People remove it because they don’t want to have to replace it frequently.
I know some newer Toyota engines have the vvt gears fail if you use thick oil.
The main reason people don't usually use vct on big cams is simply because of valve clearance. You need to keep the valves away from the pistons at all areas that the vct can reach.
Certainly high comp it's a big issue. Turbo lower comp engines you don't need such big cams if at all anyway, so vct is obvious
Some cams do some don’t. Drop ins usually no
No. Stiffer springs kills vtc.
S14 have VCT as well Scott
Hi, Scott and Haltech! I have lots and lots of problems with my car but just wanted to throw out a question to you. Can a bad evap canister cause irregular engine running when the engine is cold? Like a rough idle(when cold)...
Can you guys look into VW' EA888.3 ❤️
funny thing is ive been looking for something like this for months.
in theory i can use this same thing to activate VVL minus the off condition, correct??
Where is the vet/vvl.....100% sr20 love needed
I’ve got the red top SR non vct
SR20VET next please! 😁
Nice!! How much boost does it run? Is it on e85? Pretty solid build with "oem look" engine bay
If you were to unplug the vct solenoid while retaining vct can gear, would you need to retune the car?
omg i love uuu
So is the k engines vvt way better ?
How does the afr vary between the two? Do you need to correct it between the two?
Honda K series VVT and VTEC next 😊
Same principle for NA version??
As always, thx for you videos. Is the HKS V-CAM for the rb26 also an "ON-OFF" switch, or completely variable?
hks v-cam is variable, step 1 is 20deg max.. step 2 is 45deg max
@@goodboy_aqee58 yeah, im aware of that, but i wanted to konw, if its variable cotrollable, or also just an on/ off switch
@@goodboy_aqee58 btw, step 2 and pro have a 50° range, not 45. Also step 1 has 30° and not 20°
@@G.J.G.P. more or less.. but v-cam do variable not just on/off. stiill not using full 50/30deg if still using stock cam... btw hks source then enginered the vtc pulley itself from subaru engine
@@goodboy_aqee58 ok, thx. So variable. Ive read about the subaru thing. But still, the rest not. You still need the special cam with timing marks and special valve cover with oil feed and solenoid. So its not just the cam sprocket.
So you have one installed? Was tuning complicated? And is the difference worth the money?
Now how do we fix sync error
Wait since when can a stock bottom end sr20 make 380+ hp at the wheels
This means that it makes 440+ at the crank
I thought that stock sr20s can handle about 400hp at the crank
I think the main caps on stock SR’s are the issue, I think redsun Motorsport (specialise in SR20’s) said they can handle 450kw, because the main caps break at that power due to their design.
Keep in mind that’s with forged internals haha, totally didn’t mention that 😂
What the hell are those red alloy paddles attached to the wiper and indicator stalks? Are they meant to fake look like shifter paddels lol
I think it's because the steering wheel is so far away when fitted with deep dish
Oh you’re a rookie ahahha, it’s because the quick release pushes the wheel so far out making it difficult to reach the stalks so they’re extensions
Hehehe, hey Tuning Fork, did you write for Zoom back in the day?
No but one of script writers did ;)
Can a GPS speed sensor be used for calibrated the gear ratios?
Who you kiddin lurch ya barely fit in em scotty, you need a big seppo muscle car Scotty 🤣
Its no 2j though haha
Gods motor. 🫡
Hopefully my tuner is this smart with mine 😆