Stroker Rev

[redeclipse7782]

Just wondering what the people who are running the stroker (2.3) motors are reving up to, and what cams and other head work you have done. Also do you notice any power loss after a certain amount of rpms?

Thanks,
-Brian

 

[92awddsm]

I personally do not run a stroker(I opted not to after I had purchased all of the parts and started machine work) but I can answer part of your question. A lot of people running the 2.3 tend to shift in the 7-7300 rpm range.

The head isnt the limitation of rpm on the 2.3, the piston to rod ratio and turbo size is. Some have fully built heads and some are just running stock heads. Some have run as small as a 16g where others have run gt40r's or larger. There are also people that run every combination of head mods and turbo sizes in between. There seems to be a wide variety as far as heads and turbos are concerned so there is no specific combo that works better than others.

As for power fall off, that again is going to be limited to turbo size and cams used. For the most part, you can use a stock head with a set of comp 101200's and a 50 trim turbo and power will not fall off unless you try to run the engine outside of its safe rpm limit.

 

[red91gst]

Every setup is different, but we run the TPG shop car to 8750rpms on a regular basis. The cam/head/turbo setup makes power the whole way there. As long as the motor is built right, there's no reason you couldn't spin it to 9k. Of course, most setups are going to make peak power way before that.

The 2.3 works great for a big turbo with the extra displacment, so make sure your turbo choice compliments that big motor.

Nate
TPG Tuning
Home of the World's Faster Pump Gas 4cyl
10.65 at 133.4

 

[andymoraitis]

I have to agree with both Keith and Nate. While Keith has a point about the rod ratio and piston speed, if the motor's well built it should be able to see a higher than stock rev limit. For my own personal use, I shift at 7000-7200 since the cams have a tendency to peter out around 7400 anyway. The turbo pulls like a freight train at this level as well, but I can assure you that if I had a larger snail, I'd want to rev much higher than that.

FYI, this on a 2.3 with 8.8:1 running a Garrett 50 trim with Comp 200's, stock head and stock intake manifold (same as Keith's reference).

I'd rather run a bit lower and be safe about it.

Andy

 

[fourreGsixty3]

Where's Jake H.? Well he is running the 2.3L, fully built bottom(Groden Alum. rods, Ross Racing pistons), fully built head, hell the whole cars built up crazy ass, he runns a GT42r @like 42psi (going to 50-55psi soon as he finds a way to keep it cooler). Well enough about that, he revs his to 9k+, I forget the exact rpm, its like 9350rpm, or something, but he does this so he losses less boost when shifting.
PS His S/N on here is Topstreet
Just go looking through the stroker forum...where this should be, and there are lots of discussions of what people rev their strokers to.

Dustin

 

[Kevin Jewer]

I shifted my 2.3s at 8500 rpm. At that point I wasn't driving the mileage I used to so I can't comment on how long it will last using this shift point however.

 

[topstreet]

Thanks for the introduction Dustin!

Of course there are many variables that will help or hinder how easily your 2.3 will rev. Many people have done the math and figured that it is not a good thing to rev the 2.3 much past 7k. I would say, that if this were a road race car that lived its life at "near rev limit" rpm, that I would agree. For every day street use and drag racing type use, there is no reason these motors cant spin past 9,000RPM.

I have not used them yet, but I have heard that the FP 3X's are though the roof, when it comes to making power on a stroker. I am currently using off the shelf 272 HKS cams. I have been using these cams for nearly 3years in every setup I have put in my car. At the time, this was just about all that was available that I would trust (not being a cam expert.)

There have been several times my motor has pulled over 10K rpm on the 1-2 shift. The setup I am using is somewhat unique in the sense that its running out of turbo in the higher rpm. This causes the air temp to be slightly warmer, and the torque to be pushed up in the RPM power band. So I will have a very strong onset of torque from 5k all the way to the point where I peak a dieing turbo, at 8500ish rpm. The power band currently is insane. There are claims of 100ft/lbs gains using the fp3x's as well. If this happened in my setup that would be nearly 700ft/lbs of torque to the wheels.

The reason I bring the torque up, is because that is the large factor to what you are going to rev to. I consistently rev mine to 9600rpm.

If you are attempting to run a 100k mi. forged stroker motor that lives a very abused life at 9k+. DONT. If you want to know if this motor is going to handle the next few setups without ovaling a cylinder or throwing a rod... Then Build it!

To be honest, I think the head is more suited for a 2.3 than it is for a 2.0. Just my 2cents.

Hope this helps.

Jake H

 

[AL92]

I have a 2.4 motor.Pretty much stock head just stainless valves and manely retainers
and crower springs and titanium retainers. I have wiseco think they are 8.8 and crower rods and crower stage 3 with the jm fab intake manifold. The fp3065.
I usually set rev limiter to 7500 but was hitting it so easy in first it was just stupid.The car pulls all the way up likely would pull to 10,000 but I reset my rpm limit for 8000 and think leave it there and likely shift 7000 to 7500. Going to get me a shift light.
Autometer makes a cool new one that matches my phantom guages.
Also car revs maybe faster since have act flywheel. And don't think the crower titanium retainers hurt either. Top end rpm you need good springs to go with upgraded cams so you don't get valve float. Bottom end rpm limit guess depends on what you have used down there. Also would think occasional little trips up to 8000 is different than living at that rpm for long periods of time .

 

[Kevin Jewer]

The head isn't much of a limiter at those RPMs. The stock rev limit is set to 7500. The stock head has been reved to 8500 repeatedly by many DSMers for many years. The head upgrades sure do make you feel better about going to those rpms though, in addition to allowing you to go to higher rpm...