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Old 07-03-2018, 12:36 AM   #1
LeedomtoFreedom
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Default Boost in first?

Running an HX35, obviously very large.

Just checking to see if others with similar setups haven't been able to develop boost in first. I understand why it wouldn't build boost but I'm just gauging the audience.

If not, have any found ways of improving this, possibly manifold, wastegate, 16v im guessing.

Not running any ECU with anti-lag as well.
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Old 07-03-2018, 04:21 AM   #2
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I've had two redblocks with HX35 and both had boost on 1st gear. Other had only really quickly made exhaust manifold and mildly ported 531 on top of a B230F and the other was a stock B230FT. External 38mm wastegates with ~0.5bar spring and a boost control valve above the diaphragm.

HX35 isn't that big really.
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Old 07-03-2018, 09:11 AM   #3
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depends on a lot of things. stock lh? auto or manual? what's the final drive? what engine? what cam?
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Old 07-03-2018, 09:25 AM   #4
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With my m47 and an automatic trans rear axle (3.73) I rarely ever got into much boost in first gear, maybe a little, but then you'd gone 30 feet and needed to shift into second already. Occasionally you'd get luck (cold day, going uphill maybe) and get some good boost going, but then it would break a motor mount. This was before I put a ratchet strap on it.

Then I got a Mustang T5 with a significantly taller first gear and could routinely hit boost in 1st gear. But that would jsut spin the tires, not a lot of traction on a 240 wagon with a stiff-ish suspension.
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Old 07-03-2018, 12:56 PM   #5
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AW71 with 3.73 final gearing, never have any issue getting boost in 1st.
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Old 07-03-2018, 01:49 PM   #6
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Sorry let me clarify what I've got

lightly ported 90+
lh2.4
t-5 tranny (cant remember t-5 model to find first gear ratio)
3.55 rear end
IPD turbo cam (which is all up top in the range)
530 head
stock intercooler from 940(about to upgrade to large one)
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Old 07-03-2018, 02:00 PM   #7
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3.55 rear gears, should for sure make boost in first. I would suspect WGA stuffs if everything else is up to snuff. What PSI are you running?
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Old 07-05-2018, 01:40 PM   #8
LeedomtoFreedom
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22psi. I paid closer attention and it seems to just barely build boost. I'm not sure if I'm just being naive and expecting boost build like the 15g.
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Old 07-05-2018, 02:18 PM   #9
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Old 07-05-2018, 02:42 PM   #10
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Thanks chief
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Old 07-05-2018, 02:59 PM   #11
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spraying it will get it up on the pipe faster
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Old 07-06-2018, 02:45 AM   #12
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He351cw yes to first gear.

NPR intercooler
K cam
Mildly ported 530
Bondo Exhaust header
3" exhaust
15# of boost by 3200
42# injectors
LAO chips
3" AMM
1st os pistons
Squirters
Chevy T-5
4.10 rear end
Three stickers of various origin= an extra 15hp
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Old 07-08-2018, 08:18 PM   #13
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Yes.

Also will be pretty much an on/off switch and don't expect much below 4K.
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Old 07-08-2018, 08:44 PM   #14
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Not a hx35, but hy35 and the datalogs show positive pressure from about 2700rpm in first gear on my old b21. But at that rpm we are only talking 1-2psi... If I rev it in neutral it would almost hit 14psi @ 7000rpm.
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Old 07-11-2018, 10:09 PM   #15
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What turbine housing?
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Old 07-12-2018, 11:39 AM   #16
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12cm housing with internal wastegate I believe. I just installed an ebay special intercooler and got rid of some small pinhole leaks, helped a little. It builds boost, but like you said, very little.
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