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Post by boostbird on Nov 7, 2019 21:56:26 GMT -5
Hello all, I am new to the forum but have been in the 2.3 game for a while. I have a 88 Turbocoupe and had a 85 Xr4ti before that. I have been working on this car for a few years now and recently got the car running and driving but with issues.
My set up is:
Stock 2.3 turbo long block Stock LA3 and big VAM Motorcraft spark plugs gapped to .025 Motorcraft plug wires MSD blaster coil
Holset he351cw turbo
custom made tubular manifold out of schedule 10 304 stainless piping
Tial MVS 38mm external wastegate Custom upper intake with 70mm BBK throttle body Large Godspeed front mount intercooler 3" in and out and 3 " piping walbro 255 pump
Kirban fpr 40psi pressure vacuum disconnected -8an braided fuel line pressure and return Moroso catch can setup custom 3" exhaust with straight through 3" amazon muffler I feel that I am forgetting something but anyways I feel that my wastegate is to small for my desired boost level. I started with a 8 psi wastegate spring setup and it would creep to 10 to 12 psi. I then swapped the springs out for 15 psi and would creep to 20 psi and would get fuel cut with AFR in the mid to low 11 range. Then I figured there still was not enough wastegate spring for the Holset and tried 20 psi spring setup but hitting fuel cut before full boost.
Now I figure that I am maxing out the stock brown top injectors but I do not know if it makes more sense to upgrade to a Tial 44mm wastegate for more flow which means I have to re-engineer my manifold or just stick with the 38mm and go PIMPx standalone and larger injectors. I know the rule of thumb is big turbo on low boost = big waste gate or big turbo high boost =smaller wastegate. Curious if anyone has encounter this problem before, I figure the Holset would work okay with the 38mm tail since the exhaust housing is 9cm maybe I was wrong.
I am just trying to get some advice from some real 2.3 turbo Guru's that have run a setup like mine.
Thanks
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Post by Stinger on Nov 7, 2019 22:45:38 GMT -5
Got a pic of the header, specifically the wastegate tube and how it connects to the header?
What's the ID of the WG tube?
Why did you decide to not use the internal gate with a lower pressure actuator? If you need a little more WG flow to control boost, you can always throw the stock actuator back on there and let it crack open at 18psi or something.
You "should" be out of injector for sure and -8AN braided lines with a stock ECU/VAM/Injectors certainly doesn't make much sense so I assume you had upgrade plans either way. If it's not running lean yet it's not "out" of injector flow though, it just means it's not making much power yet.
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Post by boostbird on Nov 7, 2019 23:00:38 GMT -5
I will take some pictures tomorrow. I welded the stock wastegate flap shut. The wastegate and manifold primary's are 1 1/2".
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Post by boostbird on Nov 7, 2019 23:03:07 GMT -5
I welded the wastegate dump on the front on the collector because of clearance.
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Post by Stinger on Nov 8, 2019 0:13:07 GMT -5
The angle of the WG tube is what I'm hoping to see. Ideally it's angled "up" or it's a bend with the part going into the collector being "up" some before it turns and points forward.
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Post by boostbird on Nov 8, 2019 13:10:20 GMT -5
Here is my setup, sorry for the average pictures there is not much room for my phone in the bay to get good shots.
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Post by Stinger on Nov 8, 2019 15:51:14 GMT -5
Yeah, 90 degree connection and then angled down is far from ideal. Exhaust has a hard time turning that 90 degree corner to enter the tube, and having a down turn after that makes it a little worse.
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Post by boostbird on Nov 8, 2019 16:31:32 GMT -5
Do you think If the gate was position more towards the exhaust gas flow I could run 10-12 psi with out creep? Probably will have to ditch that location and move the gate to the back of the collector. Wish I thought about that before I cut a hole right there .
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Post by Stinger on Nov 8, 2019 19:06:39 GMT -5
I can't say definitively but it will certainly have a better chance of being able to control boost. You can use a bigger pipe that tapers down to the gate flange as well if you want, and you can even have a slight "ledge" at the top of the opening where the gate tube extends into the collector a 1/4" or something to catch a little more exhaust and direct it that way as well. Every little bit helps but the angle it meets the collector is most important. If you use a bend where it connects to the collector then you end up with a larger oval opening in the collector which will flow more than a straight pipe.
I guess if you don't want to cut another hole in the collector you can cut the whole collector off and spin it around so the current hole is in the rear...if you have access to weld everything where the 4 pipes merge together.
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Post by boostbird on Nov 8, 2019 19:38:30 GMT -5
I will cut the waste gate tube off and start from scratch at that location again but with the proper angle to allow flow to the gate. Hopefully this solves my problem so I can run a lower boost pressure with out needing an ecu and injectors just yet. Thank you for the advice I was running out of ideas.
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Post by Stinger on Nov 8, 2019 20:24:43 GMT -5
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Post by boostbird on Nov 9, 2019 11:19:45 GMT -5
Reminds me of homemade turbo forum.
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