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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 03-03-2022, 09:52 PM   #15
Garvin29
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I see, it seems that the most reliable and least complicated thing will be to buy the CP 10.5:1 pistons and not complicate my life, thanks anyway, I know that many easily reach that goal with E85. and for the guys above it will not be a stock block the question is for me to decide which piston was more suitable for my goal, I already have a lot of accessories to help keep everything good, oil cooler, a configuration of oil cans that have lowered the pressure in the crankcase, oil deflectors, oil pickup, ect. The last thing I need is to build the engine.
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Old 03-03-2022, 10:33 PM   #16
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You could get an IAG short block instead of building it. They also machine it to help the oiling issues.
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Old 03-04-2022, 01:24 AM   #17
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I see, it seems that the most reliable and least complicated thing will be to buy the CP 10.5:1 pistons and not complicate my life, thanks anyway, I know that many easily reach that goal with E85. and for the guys above it will not be a stock block the question is for me to decide which piston was more suitable for my goal, I already have a lot of accessories to help keep everything good, oil cooler, a configuration of oil cans that have lowered the pressure in the crankcase, oil deflectors, oil pickup, ect. The last thing I need is to build the engine.
I think the FA20F in the WRX is 10.6:1. People seem to be knock limited on the stock block sub 325whp with pump gas. I don't know if aftermarket rods and pistons can take a beating surviving 400whp with knock or worse. Direct injection helps, but lower compression ratio is a good idea. I don't know how much direct injection improves knock resistance. Older EVOs and STIs were maxing out pump gas around 400-425whp and that was with a 8-9:1 compression ratio.
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Old 03-04-2022, 06:08 PM   #18
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Doesn’t seem like stock block lasts long over the 3-350whp range regardless of octane.

But is there even any documentation of anyone even hitting 400whp on pump regardless of built block or lower compression or not?
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Old 03-04-2022, 06:12 PM   #19
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The other thread claimed 693hp was the record on the stock block (probably not pump gas though). I'm sure that isn't a daily driver, lol.

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Old 03-04-2022, 06:38 PM   #20
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The other thread claimed 693hp was the record on the stock block (probably not pump gas though). I'm sure that isn't a daily driver, lol.

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Yeah not on pump gas. And making 693whp once on a dyno to never go over 10% throttle again and never actually use the power isn’t really the same thing.

300-320whp w/ sc or 330-350whp w/ turbo even on Ethanol seems the top end of reliable on stock block if you’re actually going to use the power.

But reliability aside, I don’t think I’ve seen anyone hit 400whp+ on pump gas regardless of compression.
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Old 03-05-2022, 12:32 PM   #21
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Doesn’t seem like stock block lasts long over the 3-350whp range regardless of octane.

But is there even any documentation of anyone even hitting 400whp on pump regardless of built block or lower compression or not?
I got it. Built Block. Head work. +1 Intake and Exhaust.
GTX2867R Gen 2. 18.5 Pounds. 420WHP On a Dynojet 93OCT.
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Old 03-05-2022, 01:59 PM   #22
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I got it. Built Block. Head work. +1 Intake and Exhaust.
GTX2867R Gen 2. 18.5 Pounds. 420WHP On a Dynojet 93OCT.
Have a dyno? Build thread?
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Old 03-05-2022, 05:22 PM   #23
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Have a dyno? Build thread?
No build thread. But here it is.
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Old 03-05-2022, 10:43 PM   #24
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No build thread. But here it is.
Attachment 210102
Nice power.

What was the change from red to blue?
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Old 03-06-2022, 04:27 AM   #25
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i haven t understood if that is with stock compression or lowered? i guess lowered?
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Old 03-06-2022, 07:03 AM   #26
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Nice power.

What was the change from red to blue?
2 different Maps.
Map 1, Red Line is gate pressure at 17 PSI. 380WHP I think somewhere around 320 TQ.

Blue is Map 2, 18.5PSI More timing. 420 WHP. 347 TQ.

Both gets on boost 3-3.5K. Lots of response, very linear power.

It’s my track car, so there was more power with more aggressive timing. But wanted to keep it more conservative.
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Old 03-06-2022, 07:03 AM   #27
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i haven t understood if that is with stock compression or lowered? i guess lowered?
Lowered compression. 10.5:1
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Old 03-06-2022, 10:51 AM   #28
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My understanding is you start eating transmissions and axels at those levels. So you change one thing in a huge way, you need to reenforce everything else ancillary to it. I’m just puttering around at 252whp, but also research for the “one day” thoughts.

The gen 2 transmission is supposedly stronger, but I’m not sure if it is a direct bolt-up.
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