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high compression guys with 93 +meth step in

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Old Nov 17, 2015 | 05:39 AM
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Default high compression guys with 93 +meth step in

Curious to see how many guys are running over 10.5:1 with a dual nozzle meth kit and how much boost have you been able to safely run?

I have a forged motor that I really don't feel like tearing apart to change things around on it. Goal is around 700-750rwhp and I think it will take about 10-12psi to get me there possibly less.

Aluminum 5.3 block
3.78 wiseco piston +6cc dome
Eagle H beam Rods
Ls9 Gasket
Trickflow 205 heads
11.2:1 Compression
BTR stage 4 cam 235/242 111+3
1 7/8 long tube headers
Whipple 2.9L with big heat exchanger
10-12psi
Dual meth nozzle kit


Im guessing this motor makes about 550 flywheel. If atmospheric pressure doubles your HP output 14.7psi would net me approximately 1100HP. Divide 550÷14.7 that should get me about 37hp per psi. 8psi should put me around 883hp and meet my 750rwhp goal.
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Old Nov 17, 2015 | 06:02 AM
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Well i have a forged 370 and milled l92 heads. Compression should be around 10.9-1. I'll be running 91/93 and dual nozzle meth injection. picking the short block up today. curious to know who else is doing the same also
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Old Nov 17, 2015 | 08:24 AM
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10:1, single nozzle 50/50. 93 pump, stock bottom end, 20 PSI.
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Old Nov 17, 2015 | 07:52 PM
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10:1, dual nozzle 100% meth, 93 pump, 20psi with ZERO problems
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Old Nov 17, 2015 | 11:54 PM
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That is good to hear! Maybe 11.2:1 won't be that bad of an idea. I need to find out how good the Whipple is at keeping inlet Temps cool. Might need an ice tank.

Thinking about it more, might take a little more than 8psi to make 750 to the tire. It is a 6 speed tho
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Old Nov 18, 2015 | 08:37 AM
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10.7:1 here with 93/100%meth and running 11.3 psi. Got some new stuff being done so new results soon.
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Old Nov 18, 2015 | 08:44 AM
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Is running higher compression safer on a turbo setup over say a blower setup, or does it not really matter as long as you run either e85 or meth?
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Old Nov 18, 2015 | 09:18 AM
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I'm on a stock LS3 running 14psi with a novi 1500 meth+93 octane.
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Old Nov 18, 2015 | 09:47 AM
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Originally Posted by Rise of the Phoenix
Is running higher compression safer on a turbo setup over say a blower setup, or does it not really matter as long as you run either e85 or meth?
Varies greatly. Depends on whether or not running an intercooler, IC type, blower type, etc.

Centrifugal blower with an A/W intercooler typically has the lowest IATs and detonation threshold, because the compressor isn't bolted to the exhaust and it produces lower peak cylinder pressures than a turbo does.
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Old Nov 18, 2015 | 10:34 AM
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D1SC or Vortech T or JT trim blower with a FMIC.
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Old Nov 18, 2015 | 06:05 PM
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Originally Posted by Rise of the Phoenix
Is running higher compression safer on a turbo setup over say a blower setup, or does it not really matter as long as you run either e85 or meth?
Centrifugal as are "safer" per se since its linear ans not seeing torque so soon like a positive displacement blower or turbos.

One of my friends cars is TT and cr is at 9.5:1 and another one is a ProCharged setup and cr is at 10.4:1

Originally Posted by Rise of the Phoenix
D1SC or Vortech T or JT trim blower with a FMIC.
I like the procharger headunits better. The bracket design leave a little to be desired.
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Old Nov 19, 2015 | 12:40 PM
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I like the procharger headunits better. The bracket design leave a little to be desired.[/QUOTE]

You talking about the Procharger bracket setup? There is a Vortech T-trim blower with a pretty trick bracket/pulley setup for sale on here, but with the Vortech head unit/bracket, it mounts pretty high up in the engine bay, so I don't know how hard it would be to route piping for a FMIC setup.
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Old Nov 19, 2015 | 03:28 PM
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Originally Posted by Rise of the Phoenix
I like the procharger headunits better. The bracket design leave a little to be desired.
You talking about the Procharger bracket setup? There is a Vortech T-trim blower with a pretty trick bracket/pulley setup for sale on here, but with the Vortech head unit/bracket, it mounts pretty high up in the engine bay, so I don't know how hard it would be to route piping for a FMIC setup.[/QUOTE]

Yeah the procharger bracket. More so the tensioner than anything.

Should be fairly simple to get everything going.
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Old Nov 19, 2015 | 03:46 PM
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Thanks! From what I've been hearing, the Vortech T-trim blower is pretty comparable to the D1SC blower, while the JT-trim blower is capable of making more power than a D1SC.
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Old Nov 19, 2015 | 05:53 PM
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Originally Posted by Rise of the Phoenix
Thanks! From what I've been hearing, the Vortech T-trim blower is pretty comparable to the D1SC blower, while the JT-trim blower is capable of making more power than a D1SC.
The T-trim is rated for a little less while the Ti-trim is rated for a little more than a D1SC. The JT/2200 is like a F1D/F1A.
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Old Nov 20, 2015 | 10:16 AM
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Originally Posted by Detoxx03
The T-trim is rated for a little less while the Ti-trim is rated for a little more than a D1SC. The JT/2200 is like a F1D/F1A.
Okay, the one in the classified section is a Ti-trim Vortech blower. Damn, decisions, decisions.
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Old Nov 20, 2015 | 02:25 PM
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Stock LS3 Jam Cam and 91 octane and meth 814 rwhp/664 tq.

Runs 10.4@138.31 at 4120lbs too.

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Old Nov 20, 2015 | 04:18 PM
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You just have to figure out the cam timing with static compression. DCR can be easier.

My car was 10.5-1 at 22psi with 93/meth and well over 1000rwhp. Ran high 7's ect. My problem was lifting heads and burning out the rings at that level.
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