Need comments 20v dyno chart

[speedmaster]

Good call on the AFRs. I missed that graph. That lean spot is in perfect coincidence with the power dip.
Once you get rid of that it would be good to do a run running a little richer and see if you gain any power across the board.

Could that be the vvt solenoid?

[speedmaster]

if you want more torque and hp ur going to have to scrap the VVT and get a higher lift set of cams...

Im not using vvt pulley now.

[yoshimitsuspeed]

Im using water methanol injection so I need to keep my airbox. I have several stacks but cnt fit in them. The only I can fit in is the imec stacks

I have been wondering about why you are running meth. You don't see that very often on an NA build but the only reason I could see doing it would be to raise your octane and prevent detonation. With big cams and 12:1 it doesn't seem like you would benefit from that. If you wanted to make the most of meth on an NA build I'd think you could run some crazy compression.

[yoshimitsuspeed]

if you want more torque and hp ur going to have to scrap the VVT and get a higher lift set of cams...

How are bigger cams going to improve his low end?
The whole point of the VVT is retaining low end while opening up the top end. How will he gain in both areas by sacrificing the tool designed to gain in both areas?

[speedmaster]

Im using water methanol injection so I need to keep my airbox. I have several stacks but cnt fit in them. The only I can fit in is the imec stacks

I have been wondering about why you are running meth. You don't see that very often on an NA build but the only reason I could see doing it would be to raise your octane and prevent detonation. With big cams and 12:1 it doesn't seem like you would benefit from that. If you wanted to make the most of meth on an NA build I'd think you could run some crazy compression.

Yes. Im trying to increase my octane and reduce knocking. Do you think by using longer stacks will improve?

[jabran200]

if you want more torque and hp ur going to have to scrap the VVT and get a higher lift set of cams...

How are bigger cams going to improve his low end?
The whole point of the VVT is retaining low end while opening up the top end. How will he gain in both areas by sacrificing the tool designed to gain in both areas?

VVT will give him low end torque up to about 4500-5000 but may not even benefit him if it is a drag car. I don't see how VVT will open up the top end when vvt is off it would be the same as running as running a 264 cam without VVT.

If the car drives fast I wouldn't be too worried. Is this dyno eddy current or inertia?

[speedmaster]

if you want more torque and hp ur going to have to scrap the VVT and get a higher lift set of cams...

How are bigger cams going to improve his low end?
The whole point of the VVT is retaining low end while opening up the top end. How will he gain in both areas by sacrificing the tool designed to gain in both areas?

VVT will give him low end torque up to about 4500-5000 but may not even benefit him if it is a drag car. I don't see how VVT will open up the top end when vvt is off it would be the same as running as running a 264 cam without VVT.

If the car drives fast I wouldn't be too worried. Is this dyno eddy current or inertia?

Inertia

[jabran200]

Scrap what i said last i thought rokurunner said duration, I agree higher lift will help. Although my 16v without any of the fancy stuff this engine has produces almost the exact same torque with a better curve makes me think the current setup should have more in it...

[speedmaster]

Scrap.waht i said last i thought rojurunner said duration. I agree higher lift will help. Although my 16v without any of the fancy stuff this engine has produces almost the exact same torque wirh a better curve makes me.think the current setup should have more in it...

you mean my current setup shud produce more?

[onnaj]

For comparison, this is from my Blacktop. Take note it had only 1800 miles after the rebuild so it isn't fully loose yet. This is a bone stock rebuilt Blacktop (except the open air intake and with a very very restrictive 7AFE exhaust).

I think the little dip @6600 rpm is where the VVT is disabled.

Power is corrected to the crank, wheelhp was only 121.x i believe.

[yoshimitsuspeed]

if you want more torque and hp ur going to have to scrap the VVT and get a higher lift set of cams...

How are bigger cams going to improve his low end?
The whole point of the VVT is retaining low end while opening up the top end. How will he gain in both areas by sacrificing the tool designed to gain in both areas?

VVT will give him low end torque up to about 4500-5000 but may not even benefit him if it is a drag car. I don't see how VVT will open up the top end when vvt is off it would be the same as running as running a 264 cam without VVT.

I meant that it gives you the ability to retain both.
If he wanted he could change the intake gear timing to give him more mid range as the VVT does when on but then he would loose some top end.
If he had the intake cam timing where the VVT was when it was off you would loose the mid range but gain top end.
Unfortunately you can't keep the intake cam gear with the VVT to tweak things further but you can tune with the ST gear and the BT gear to see if one works better than the other.

[yoshimitsuspeed]

Im using water methanol injection so I need to keep my airbox. I have several stacks but cnt fit in them. The only I can fit in is the imec stacks

I have been wondering about why you are running meth. You don't see that very often on an NA build but the only reason I could see doing it would be to raise your octane and prevent detonation. With big cams and 12:1 it doesn't seem like you would benefit from that. If you wanted to make the most of meth on an NA build I'd think you could run some crazy compression.

Yes. Im trying to increase my octane and reduce knocking.

I wonder how your fuel compares to ours in the US.
I am much more experienced with tuning on boosted motors but 12:1 with big cams just doesn't seem that aggressive. I wouldn't think you should be anywhere close to knock.
I am running 7 PSI on a stock blacktop with stock cams and 11:1 compression. If I had your cams I would think 10 to 12 PSI would be easily achievable.

Are you experiencing knocking? How are you monitoring knock?

Do you think by using longer stacks will improve?

Anything that you do to increase VE in lower to mid RPMs could actually increase chances of knocking since the low and mid RPMs are the most likely places to knock. More air in the cyl in that range will just increase that.

How did you optimize your timing? Is it just as advanced as you can get it without knock or have you tuned it to the point of peak power? Or do those two coincide?

[speedmaster]

How did you optimize your timing? Is it just as advanced as you can get it without knock or have you tuned it to the point of peak power? Or do those two coincide?

yes advance until there is no knock. and also tuned until i get peak torque. I did get 171hp / 157.58nm at some point and then retuned to 170hp / 158nm

i have the Knock Box installed but too much noise coming from the sensor, so the tuner did not use it.

[rrego]

my input on this.
you seem to have soem ignition problem, the fluctuation in your power curve needs to be worked on,
two things that are typicall to this are not enought spark and you are not firing here and there and knock sensor getting triggered.
knock sensor problem normally happens on highter rpm lean condition.
But 20V's do not have good spark from factory.
Did you try doing a full pull on new plugs pull them out and read what is happening.

your power numbers are pretty good.




the dip for VVT if you are using a stock ECU I could understand as the switchover is typially mapped pretty badlly on the ECU.
but it look slike you are using something tunable?

[speedmaster]

Its Adaptronic e420c ecu.