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I know there are a couple of threads similar to mine but:
I have Pulsar with stock Sr16 and considering 2 options:
1. Add N1 cam only
2. Stroke the current motor to SR20ve
Which will be better investment (hp per $ spent)?
What gains can I expect with both?
In both instances I plan to use sr16 stock ecu, stock injectors and may add headers and CAI. The car already has 2.5" exhaust.
Don't want anything complicated or expensive. Don't want to use a piggyback device (if i can avoid). Looking for reliability. It's a daily driven car
If I were to with option 2, my main concern is type of piston - Compression ratio - since the best pump gas we have is 90 octane.
What is the simplest way to achieve option 2 and what parts do i need - I assume I'm gonna need sr20 crank and rods but specifically what pistons so as not to have a very high CR (remember 90 octane!)
thanks for your input.
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2000 Sr20ve Powered Pulsar VZ-R
SR16ve Cams & Ecu, Greddy Emanage (Blue), Apexi RSM (SCD), 60mm Exhaust, JWT Pop Charger Air filter, Tein HA coilovers, 15" Wheels, ACT 6 Pad Sprung Center Clutch w/ Heavy Duty P/Plate, Prothane Motor Mounts. 175whp, 134ft-lb Torque, Top speed 140mph (so far) To come: Noise!
You should be able to put down 180hp to the wheels with the 2.0 motor and SR16 cams. Might be even 186 with SR16's pistons in there too.
20ve pistons will be too low and 16ve pistons will be too high so I'm a bit undecided here. Dont want to having to shave off portions of the 16ve pistons. The highest octane I have availbable is 90.
You can always get a calum real time ECU and tune it with a laptop computer. If the highest octane you can get is 90, how does the car run now? Because if you use the same pistons you are using now with the SR20 crank to stroke it, you shouldn't change the compression from what you are running now.
As far as power goes, you'll have way more room for improvemtent if you stroke it. Consider that:
1) N1 cams can always go in at a later date
2) Stroking the motor will provide more torque, making the car feel much faster
3) Running SR16 pistons with a SR20 crank will yeild even MORE power
4) A good ECU tune can pull even MORE power from a larger motor
Something to chew on a bit. CHime in VE gurus...
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Quote:
Originally Posted by Serban
Making your car RHD would be the MOST pointless mod ever. Go get a job for the Post Office, you can be JDM 8 hrs a day.
1991 SE-R -- SR20VE - Hot Shot intake w/ Pop charger, Megan cat-back exhaust, SSAC headers, 2000 SE disc, ACT HD pressure plate, B&M shifter, ADV22 brakes w/ SS lines, FSTB & RSTB, ES sway bar bushings F/R, & Prothanes
I dont have a fuel issue now but I am sure that with change of con rods, then the CR will go up. I cannot afford to run anything over 11.5:1 on our fuel.
If you don't have a header or cai you are kind of putting the cart before the horse. Why not get those and start preparing for the 1.6-2.0 conversion?
Point taken.
The CAI can be added when the upgrade is being done. Header? Well if I cant get a decent one (made for the ve) then I will stick to the stock manifold. Dont want to use a sr20de manifold that I will have to convert.
The CAI can be added when the upgrade is being done. Header? Well if I cant get a decent one (made for the ve) then I will stick to the stock manifold. Dont want to use a sr20de manifold that I will have to convert.
Peace
Then you are left with the Fujitsubo header and the 20V manifold from the 204hp VE engine as the options. The SSAC does do the job though its not like you have to weld to make it work.
Anyway I just thing that changing the crank and rods is a lot to go through. Will the cams hit the pistons if you do that with 16VE pistons/cams? I forget... Also that will put your compression pretty high. Might be tough for you on 90 octane fuel.
20ve pistons will be too low and 16ve pistons will be too high so I'm a bit undecided here. Dont want to having to shave off portions of the 16ve pistons. The highest octane I have availbable is 90.
How safe is this 16/20 set up without management?
Also what is the measure of the octane? Does it say MON or RON on the pump. One of them slightly exxagerates the actual octane. You could be dealing with 87
It's not true that the C:R will not change. The C:R is the difference between volume at BDC and TDC. I haven't calculated the SR16 going to SR20 combination, but I have calculated the SR20DE with N1 pistons vs. SR20DE w/ N1 pistons and then de-stroking the engine to SR16VE crankshaft. Taking into account same head gasket thickness, head volume, etc. the "SR16DE" hybrid engine would make less than 10:1 C:R, and with the N1 piston in the SR20DE it would have been 11.75+:1. Don't recall the exact numbers as I don't have that spreadsheet in front of me but don't make the assumption that increasing the stroke will not increase the C:R. If you have only 90 octane to work with put the N1 cams in and leave it there, unless you want to do custom pistons or SR20VE pistons to keep the C:R under control.
I have a spread sheet if you want to try and calculate where your C:R will end up. PM me with an e-mail address and I'll send it to you.
U are right. I was never of the opinion that the CR would not change. As a matter of fact the change in CR is my main concern. I would never use the 16 pistons. I am considering using the 20ve or 20de pistons but not sure how low those would take me.
Is there a part number for the SR20VE (20V) cam? Is this a US buy or Japan only? G Spec does not list this cam. It seems to be the best cam for street performance.
