259 hp / 239 tq on 23 psi v-trim. Wait...what?

[tenn-gsx]

Again look at your pre turbo intake piping. If your using the stock mas and have a leak between the turbo and the mas that will allow unmetered air into the intake system. Having unmetered air will do a few things. You will show low boost est and low lbs per min airflow, as well as you will run leaner than you should. This will in turn make it very difficult to get your fuel trims inline, and cause ALOT of knock.

[daren_p]

Just took a very quick look (& haven't read through the thread yet) but I would say a big part of your lack of power is due to knock/very low timing. Your airflow isn't all that bad considering the cams your running & your stock 2g top end (can't directly compare to a 1g as their top ends flow better stock). One of my buddies dyno'd just over the 300 whp last summer on his 2g gst with all the basic bolt-ons, stock cams with an evoIII turbo & right around 20 psi. The vtrim doesn't move huge amounts of air but I do know someone that ran an evoIII then a vtrim back to back & he said the vtrim defently had more uptop. I'd start by being less agressive on leaning out the fuel & try to get your timing back up to something more resonable (atleast the 14-15 deg range). Timing has a much greater effect then running a leaner air/fuel ratio. If it takes running mid to even low 10 to 1 ratios to see the 14+ deg timing, still do it. More then likely you will make a good amount more power.

[spyderturbo007]

Originally Posted by iiiwildfireiii

That was one of the reasons I was asking how much airflow FIC 650's are good for.

Look here for injector and fuel pump calculations.

650cc @ 100% IDC will support 46.66lbs/min
650cc @ 80% IDC will support 37.32lbs/min

[UofACATS]

I'm hesitant to start looking for problems based solely on dyno numbers. What type of dyno? Have you been to this dyno before? Having another referance point would be helpful.

The log showing knock and low timing is part of the low power. Like someone mentioned there are many reasons this can occur from high charge temps to a bit lean on the pump gas tune. On pump, I shoot for an AFR of 11:1, but I also get 91OCT here, so take it with a grain of salt. Actually, that goes for all the dyno numbers being spouted.

What octane gas are you running?

[97EclipseGSX]

Were the cams degreed when you put them in? If not degreed did you at least try to play with them while on the dyno? You have to remember that the cam settings can play a huge role in whether the car makes power or not especially if they are way out.

Also do you have an EGT gauge? People seem to overlook this aspect of tuning. In cases like this your EGTs are very important and can tell you if something screwball is happening. You seem to be spraying a lot of fuel, for the amount of power that is being registered, I understand there can be many reasons for this, but if your EGT's are cold then your just blowing it all out the back. If your EGTs are hot then you need to consider lowering the timing or adding more or better fuel. This will obviously vary dependent on what you currently have and have tried. If your EGTs are normal then I would start to consider mechanical problems.

You have to remember knock can be created due to both lean and overly rich conditions and watching your EGTs will tell you this if monitored properly. Changing to a larger turbo in most cases will not help you if your cams are out of wack, your fueling needs are not up to par, ....

Just my reccommendations, hope they are useful to you.
Happy tuning.

[iiiwildfireiii]

All of you, THANK YOU for your replies and helpful hints and suggestions. Give me a few days to put together some of the answers to questions you asked and find out some facts and I'll give you an update soon. A LOT of the things you've said are.....very.....obvious things I should have seen for myself and I feel like an idiot for even having to ask. Expect an update very soon.

Once again, a huge thank you to everyone for your help!!! I freakin' love my fellow DSM'ers.

[dsm-onster]

A little side: the v-trim flows 50+ lbs/min at 60% efficiency as show on it's compressor map. Now I've not seen many people actually this. Mostly just the cy/ty crowd. But the map looks better than a 50-trim with respect to flow. The evo3 16g has never been reported to flow that much. I would just cotinue to tune. Our engines seam to like more fuel and more timing. I think your tune is backwards from the typical 400hp setup.

Your MAFRaw is a bit choppy 2000Hz and up. In fact the graph looks like maf overrun from my exprience. Below is what maf overrun looks like. Notice how the MAFRaw curve levels off and becomes choppy:


And to add to that. Your boostest is dropping down to 15psi by 7000rpm. But you're not seeing boost drop off that much are you? You could have an intake pipe leak. I don't know why you would have maf overrun with your 2g maf at this low a frequency. Plus dmlink is figuring 9ish:1 a/f when you're running much leaner. Which would also indicate overrun or intake pipe leak (not boost leak).

Also. Do you know that your Maf Compensation slider right at 2000hz is moved up 2%. . . This certainly richens things up a little. I'd check for boost leaks and intake pipe leaks, run richer, and add timing.

[tenn-gsx]

Did you get the problem fixed?