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Post by monarchengr on Oct 23, 2022 13:40:46 GMT -5
I'm debating on whether it is worth exploring a different intake on my 2.3. Not sure if it's the restriction or the head is.
Current Setup:
93 hatch, not stripped
2.3T from Merkur
T5 trans
PIMPx
80lb injectors
93 intake stock throttle body
93 dual plug head
1.9 boport cam straight up
HX35
3inch exhaust
Stinger intercooler setup
22lbs boost and 19-20 degrees timing
Stock Head, lightly polished
No idea on power but have these times.
Car probably in the 3000lb range
2.4 60ft
9.01s 1/8
87mph 1/8
If both the head and intake are about the same restriction, I'll just go meth I guess.
Thanks!
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Post by Stinger on Oct 23, 2022 15:25:24 GMT -5
I think you're likely running too much timing (if you're still running dual plugs), and I wouldn't be surprised if there are issues with your valves leaking (non-hardened exhaust seats and stock valves will not hold up to the heat a turbo provides and the seats will sink and leak over time). That cam also requires an adjustable cam gear and for the cam timing to be dialed in so there is a pretty good chance there are gains to be had there as well. If I could look at a datalog of a pull and the tune that goes with that tune, I'd be able to tell more.
The 1.9 cam is likely not a real good match for the stock intake due to the long runners (peak power in the 4000-5000 rpm range) while the cam likes to make peak power closer to 6500 rpm. This is where cam timing adjustments can help to get these two peaks closer together/more optimized. I assume you upgraded the springs at the same time as the cam?
The 60ft time indicates this vehicle is not optimized for drag racing (likely street tires and either massive spinning or it spun and then bogged). This throws off your ET, and artificially raises your MPH (if it spun like crazy).
There is certainly something to be gained by even mild porting of the intake (and head if possible) but this isn't always feasible if you can't do it yourself.
Where does it feel like peak power is and/or does it feel like power falls off at a certain RPM?
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Post by monarchengr on Oct 23, 2022 15:39:20 GMT -5
Definitely considered the cam gear, I'll have to look into that. New valve job on the head, only 500 miles on it, so they probably aren't leaking yet. Did springs and lifters.
It is still running 2 plugs and I backed timing out 2 degrees from the base map when I received the PIMPx. Running ET Street drag radials, but I'm not launching hard so it does bog.
No wheel spin during the run. I haven't played much with launching yet since I still need to get the 2 step working. I did lightly port the head, left the floor alone, did the roof and the walls. Also smoothed the short turn radius while removing quite a bit around the valve guide. But I dont expect that did much maybe a 10% gain.
Seems to pull hard all the way to the top. It definitely doesn’t lay over anywhere. Total dog below 3k-3.5k, but I expect that to be the case and don’t really mind.
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Post by Stinger on Oct 23, 2022 19:43:03 GMT -5
Were hardened exhaust seats and SS valves installed? If not, it won't last long (and may already be starting to leak).
The startup guide's last step of the DIS section says this about timing:
If you’re using dual plug cylinder head, you’ll need to pull 5 degrees out of entire timing map since the dual plug configuration creates a quicker burn. To do this, go to (Ignition Settings > Ignition Table1), highlight entire table by clicking and dragging across it, or simply hitting “A” key on your keyboard while holding down “CTRL” key. Once highlighted, click “-“ button in the top right corner of the table and decrease selected cells by 5. You should see all of the values in the table decrease by 5 at this point. Now click Burn.
Ideally you'd use dyno testing or track testing to find where timing should be.
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Post by monarchengr on Oct 23, 2022 20:13:42 GMT -5
No, I did the valve job. Just cleaned up the seats on the stock head and ground the valves. I did read about pulling timing in the file, but misread and only pulled 2 instead of 5 degrees. I’ll pull another 3 out and see what times I get. I’ll definitely check out the adj. timing gear to help dial it in. With the timing, if I back out and see a big loss in HP, I should be able to add back until the gains are minimal correct?
2 other questions:
Can I run a single plug turbo head on a dual plug system, just leave one of the coils packs unplugged? I still have the good turbo head and have debated on sending it to Bo for porting. Will also get the hardened seats then too.
Will meth be a worthwhile addition? 400 bucks isn’t bad is I can gain 50?hp
Appreciate the help, you guys are a great source of knowledge for someone screwing around in their garage.
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Post by Stinger on Oct 23, 2022 22:02:36 GMT -5
Yes. Typically dual plug engines require significantly less timing on pump gas relative to a single plug engine. They are also less detonation sensitive though so you can normally "get away with" more timing than it needs, though there won't be a power gain associated with it.
Ultimately, if it's picking up MPH as you add timing then you're heading the right direction. If you add some and it gains nothing, back the timing down as it's already too advanced.
If trying to do this at the track, you need each launch to be as consist as possible so it doesn't skew the MPH.
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