Posts by Bugzilla

  • Bugzilla's supercharged destroked 2.4L build

    Quote from Dave@DDMWorks

    The 2.4L has to have a smaller diameter reluctor wheel since the stroke on the 2.4L is longer, if you use the same size reluctor wheel as the 2.0L the piston would hit the reluctor wheel when it gets to the bottom of the stroke. You are correct though, the 2.4L block gets machined about .100" more at the crank sensor to get the correct spacing for the sensor off of the reluctor wheel.

    Yep, just wish I figured that out sooner. I should have caught it during assembly but I put the crank sensor in once the engine was in the car. So I never hand spun the engine with the sensor in. I am actually surprised it lasted about a 125 miles with how bad it was rubbing. Now back to trying to get it on the dyno while the weather is good!

  • Bugzilla's supercharged destroked 2.4L build

    Well ya for the past couple of days the weather has been pretty good. Good enough I have been driving the Bug to work. But of course, the weather gets good and works gets crazy at the same time. So no dyno yet and I have my race tomorrow. Will shoot for next week if the weather stays nice.

  • Bugzilla's supercharged destroked 2.4L build

    Quote from LargeCar

    Loved reading this thread, except for one thing. RPM is the correct term, RPMS or RPM's is not correct. It is Revolutions Per Minute. Only one minute is measured, not several minutes.


    I'll go hide now, but I will still read the thread because y'all are really smart people doing what I wished I could do.


    LC

    Well you didnt mention "RPMs" (note the lowercase s / no apostrophe) so I guess I am still good!

  • Bugzilla's supercharged destroked 2.4L build

    Quote from Dave@DDMWorks

    Absolutely, once we release the total package, we will release a lot of information about the best setup.

    Awesome! Thanks Dave. Cant wait to see the results. It will be a good comparison to my build to see if destroking it really did help the top end power or was just an all around bad move. If you guys can get a 2.4L to peak power around 7500rpms, I will be very impressed.


    Also, didnt want to quote what you said before cause it was getting to be way too long but I get what you mean about having the rev limiter set past peak power. Thats how I always set mine but to a point. I race Autocross as well which is why I was shooting for more rpms. Like you said, some tracks just need that extra rpm to make it to the turn and you have to push it past its peak power to do that. The reason why I am shooting for more rpms is in relation to the graph you posted. The higher up the peak power/torque is in the rpm range, the flatter those lines will get. The flatter the lines are, the more power you will be using when averaged out. Sounds like we are on the same page now.

  • Bugzilla's supercharged destroked 2.4L build

    Quote from Jeff@DDMWorks

    The big points here would be this test was done with the Alpha header and 1320 exhaust. These are both limiting factors that can not breath on the top end. Like I said before we have found the limits and found ways around them.
    @Slingrazor is one of our most modded customers on a stock engine.

    So any chance you can release some info? Like on your package with the correct intake and exhaust + cams and a supercharger, where does it peak power? Maybe a dyno graph?

  • Bugzilla's supercharged destroked 2.4L build

    Quote from Jeff@DDMWorks

    With our DDMWorks engines and Rotrex Supercharger kits the rev limiter is peak power :evil: . We have ran into restrictions like exhausts and so on but we can and have found ways to over come and push for more. We set our limiter at what we know is safe and what we know makes power.
    As far as the cams go we will not be dropping any specs on you guys just yet as that is what you might call proprietary information ;) . Testing has gone well with them and as soon as we get the rest of the package together we will let you all know. Spare time is hard to come by these days and we are not complaining.


    Thanks for the continued interest and support :thumbsup: . Hopefully we can get some more exciting parts out soon.

    Jeff - After doing some searching around on the forum, I found something Dave posted earlier. He also gave away partial cam specs if you know what stock cam specs are... Here is what he said in another post.


    "We have been super busy, but finally had time to test some custom cams we had made for us and the results were pretty awesome.


    For those that are not super familiar with the cams on the LE5/LE9, the cams have integrated passages in the front that allow oil to flow up to and back from the cam actuators on the front of them. This VVT mechanism is really a nice benefit, but because of the passages in the front of the cams, cam blanks are not available. This has left the options for cams in the past limited to reducing the base circle on the cams slightly, which does increase lift, but does not really change duration much. The duration is what is going to allow the engine to breathe in the upper RPM range and is what we were after with these cams, since it also complimented the power profile of the Rotrex supercharger also. The custom cams we had made for us increased the duration of the intake cam 19 degrees and the exhaust cam duration was increased 25 degrees overall. This allowed the engine to breathe much better on the top end of the RPM range with some drop in torque in the lower RPM range, which was the tradeoff that we were looking for, the end result was 358HP at the wheels @10.5PSI."



    So first off, according to this dyno chart, it makes 358hp @ 5700rpms. Looks like the pull was made to 6700rpms. So with the cams, supercharger, header and exhaust peak power is 500rpms sooner then a stock 2.4L? Where is the limiter set on that combo? Not trying to bash, just looking for some clarification.


    @Slingrazor What mods do you have? If your limiter is set to 7300rpm, I am guessing you are modded in some way.

  • Bugzilla's supercharged destroked 2.4L build

    Thanks guys. I must say, there is a chance the blower is coming off before it even hits the dyno. Like most of you, I need more power. So, I already have the header and turbo, just need a heat exchanger and to make some piping. Then turbo time. And big power time.

  • Bugzilla's supercharged destroked 2.4L build

    Quote from Slingrazor

    The red line for our ECUs are around 7300. That is HP at the rear wheel. With the single drive wheel I believe crank is about 35 higher. Most of the numbers you see posted here are at the rear wheel, what is actually on the ground.

    Red line and peak power are two different things. I can set my limiter to 8500 rpms but it would be pointless since the engine peaks power around 7800 rpms. If I remember right, a bone stock 2.4L peaks power at 6200 rpms. Having a limiter set at 7300 would be pointless. I would say 7300 is a good limiter for an engine that peaks power at 6900 rpms.

    Quote from Neosolidus

    DDM said the "more info coming soon" that was said back in January , so i guess that is their version of polaris "in two weeks". :00008356:

    Haha that is very true! Maybe Dave will pop in with some specs.