Well in terms of interita, moving the rod pin further out to increase the stroke will increase the rod angularity, but more importantly you are slinging the mass further out from the centerline of the mains.

Picture a figure skater spinning, why do they revolve faster when they pull there arms and legs in close to the central plane of their body, and when they want to slow down they spread out. So you want to take your motor, spread its arms and legs further out of the center line, but ask it to spin even faster. Like I said, wear a helmet.

 

91 Octane and 22 psi of boost graphed in red. My car stock with a boost control set at 21psi graphed in green for comparison.

 

Darkhorse,

I understand what you're saying but I'm only asking this engine to run about 8000 -8200 revs. If this can't be done then someone needs to tell RNR, Boost Solutions, AMS, and about 1/2 dozen other reputable tuners before all of the stroker Evos start to blow up. And I do wear a helmet, I'll bring extras for those standing around watching me race.

 

3240, two things.

1) Your racing, there are risks, there are no guarantees, that's (I think) what Darkhorse is implying. Sure, there are shops that do 8,500 rpms, because they're racing, you take risks when racing.

2) For comparisons, it looks like you make 200whp at roughly 4200rpms on C16. No offense, but that's very poor for spool up with the added .3L of displacement. I don't have too many dyno graphs saved but I believe the AMS 667whp GT35R on a 2.0L actually spools quickers than that.

 

A lot of DSM people joining in which is cool since they, in many cases, have many years of experience with this engine. So, bottom line, am I asking for trouble reving a 2.3l to 8000rpms even with a stronger crank, Pauter rods, and Toda pistons? RNR, Boost Solutions, and AMS so no but I'd like to hear from some more people that may have seen problems with 8000 revs on a 2.3l. RNR is making this crank and they're convinced that this engine can handle it without any long term problems. I'll admit that I don't have any experience with the 4g64 engine or Japenese cars in general. But, I've been relying on RNR, Boost Solutions, and AMS for advice. Are they wrong?

Darkhorse,
You're not an idiot. Your post was just a weak attempt at humor, happens to everyone. Thanks for the input.

 

Well, since Darkhorse is an idiot, why don't you just muster up an ounce of man-sauce and take it to the track. Rev to 8500, if it stays together at 32psi you'll find out the answer to your question.

 

Metaphysical,

A) I said that Darkhouse is not an idiot. Just joking around his posts on this forum are very informative.
B) That's my plan. Go to the track. Run 30psi and 8k revs. I'll let you know how it goes.
C) Post some dyno charts that show better 2.0l spool up with such a large turbo. They may be out there but I can't find any including the AMS pull that you were talking about.
D) I'm making 500whp and 500ft/lbs of torque at 5200 rpms. If that's laggy then I like it! Also, I'm at 6000ft above sea level. It's a little tougher to get things "spoolin" up here.
E) "Man-sauce?" I've got three little kids, sorry but no man-sauce left.

 

dam take it easy guys. We are trying to help each other out. 3240 if I were you I would listen to darkhorse (my opinion) it's up to you.

 

I know, sometimes it comes across not as good as I hoped, take the NightRider post- phew! that was a real gem.

Ok, but in all fairness, give me another shot at it? Ok, ready, here goes...........

The helmet on your head isnt that one that I was suggesting you try to protect

 

Much better!
I kind of liked the knight rider post.

 

Az3ar,

I may listen to him. It's a tough decision due to all the difference of opinion. That's why I like this forum, you can learn a lot by listening to people with experience building these engines.

 

3240, perhaps it's the HKS turbokit that's hurting your spool up. Because here's a chart of the AMS 2.0L on a large GT35R, his dynochart (not the real world) indicates faster spool-up than yours. Bear in mind Al had the same turbo as you and added 150whp and improved his spool-up with the AMS turbo.

http://forum.aempower.com/bbs/viewtopic.php?t=9396

 

David, would you please elaborate on your experience with strokers.

I think most people realize that the higher rpm available with the stock stroke will always deliver more Peak Power in an "all out" drag application or Dyno Queen, but............

Since EVO's are relatively heavy, 99% of them are daily drivers, quite a few are road raced/autocrossed and they are all fairly gutless- (off boost and with low boost), I think it should come as no surprise that we NEED more low end grunt.

Edit: forgot to add that synch'ed trannies don't like to shift @ high RPM.

I'm curious to know if you feel that the added friction, subsequent wear and reduced revs of a stroker make it unattractive for ANY application. This is the "vibe" I've gotten from your posts on the subject.

Thanks for any and all input,

JDB

P.S. I've always been impressed with your work and I appreciate your willingness to share your time and knowledge around here!

 

1. He's running 39psi vs my 26psi.
2. At 3,500 RPM's AMS is making about 140 whp, I'm making about 130whp. But, AMS is only making 100 ft/lbs of torque while I'm making almost 200 ft/lbs of torque.
3. At 4.500 rpms's AMS is making just over 300 whp while I'm making about 290 whp. But, he's only making just over 230 ft/lbs of torque, while I'm making 330 ft/lbs of torque.
4. At 5,000 rpm's AMS is making 500 whp and I'm making 450 whp. But, he's only making about 390 ft/lbs of torque while I'm making about 480 ft/lbs of torque.
5. After that his 39 psi kicks in and I'm toast!

In addition to increasing spool up time a stroker is supposed to add low and mid range torque (mission accomplished.) It will be interesting to compare these charts when I increase my boost to about 30-32psi but not AMS's 39psi. What has AMS done to their car that allows them to run 39psi? That's incredible!

I do agree that AMS makes an awesome turbo kit but it wasn't available when I began this project. However, I am pleased with the HKS kit. If I had to start over would I have bought it over AMS? No.

Keep in mind that I'm in Colorado when you compare my spool up to anyone at sea level. Also, Al ran an HKS 3040, I'm running an HKS 3240 which is slightly larger.

Thanks for the link. The AMS car is impressive.

 

David,

Since I've already completed my stroker and it's too late to change back to a 2.0l, would you also comment on the rev limit on a 2.3l. I appreciate your help.