10:3:1 compression too high for turbo motor? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 23 Old 11-23-2012, 08:06 AM Thread Starter
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10:3:1 compression too high for turbo motor?

Put together a dart iron eagle 427ci and the compression is a little over 10:1. This is to be a turbo motor. Not sure if its too high as I have no knowledge of boosted motors


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post #2 of 23 Old 11-23-2012, 08:27 AM
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Depends on how what gas? E85? , pump, race? And how much PSI? Because your not crazy high just on the ahhhh I don't know end of pump gas, but the others you could.

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post #3 of 23 Old 11-23-2012, 08:29 AM Thread Starter
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Planned on pump has with meth injection for the street and c16 on the strip. Didn't plan on running more than 21psi in either case.


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post #4 of 23 Old 11-23-2012, 08:52 AM
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Years ago I ran around that compression with a B-trim Vortech and I think it was 12lbs of boost. I had no after or inter cooler or meth or even a custom tune. I ran 93 octane on the street and dumped 116-118 into it at the track. Only other thing I did is at the track I adjusted my 6btm.


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post #5 of 23 Old 11-23-2012, 09:36 AM
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I have 10.16:1 on my 5.4 and I'm planning on going turbo. I'm hoping to run e85 if we can get a local station, but if not I'll run 93 and meth.


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post #6 of 23 Old 11-23-2012, 09:45 AM
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As I understand it the modular motors handle boost with compression much better than the pushrods.

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post #7 of 23 Old 11-24-2012, 09:49 PM
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What turbo?

I would run good fuel always with that combo.

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post #8 of 23 Old 11-25-2012, 01:05 AM
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it will be close on 21psi but with pump gas cant see more then 10psi


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post #9 of 23 Old 11-25-2012, 11:30 AM Thread Starter
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Bullseye power 96mm 1.10 billet withT6 housing


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post #10 of 23 Old 11-25-2012, 12:47 PM
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This is my first stab at a turbo sbf, but with my old Turbo Dodge, it had much better throttle response and spool up with a little more static compression, I think with either
e85 or meth. it will be ALOT of fun on the street and a complete animal at the track.

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post #11 of 23 Old 11-25-2012, 01:15 PM
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Are you looking at a S400 chassis? With those cubes I'd look more toward a S500-88 or GT50-55.

If you're stuck on the S400 put use the 1.32 housing.

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post #12 of 23 Old 11-25-2012, 01:44 PM Thread Starter
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Yea it's the s400, I went with what Steve Morris race engines suggested, I've been nitrous and procharger guy so turbos are all new to me


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post #13 of 23 Old 11-25-2012, 01:48 PM
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If that's what they suggest they know your goals better than me. Wouldn't hurt to get a second opinion from Reed at Work Turbos or Chris at CRT.

That turbo will probably be done at 6k, but depends on what you're doing with it. It'll make some steam.

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post #14 of 23 Old 11-25-2012, 03:27 PM
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Is the 96mm the turbine wheel or compressor?

E85 would be a great choice

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post #15 of 23 Old 11-25-2012, 03:36 PM
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The 96mm is the turbine. The common wheels for the S400 are 87mm, 92mm and 96mm.

Check out Yellowbullet in the turbo section. Wealth of knowledge over there.

E85 with that compression would make for a responsive street car. I will be running E85 as I have a station 5 minutes from my house. Living in the corn country has its perks.

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post #16 of 23 Old 11-25-2012, 05:21 PM
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I agree its the turbine, I was curious though cause it sounded off when I asked what size turbo.
Most would think he is running a 96mm compressor with a reply like that.

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post #17 of 23 Old 11-25-2012, 05:28 PM Thread Starter
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We don't have e85 within 50 miles of here so that's outta the question. Thanks for all the info guys.


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post #18 of 23 Old 11-25-2012, 09:27 PM
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10.2:1 here, 12lbs on pump gas, conservative tune made 603/618. 408W through a TKO 600.

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post #19 of 23 Old 11-26-2012, 12:10 AM
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Quote:
Originally Posted by strebar View Post
Not sure if its too high as I have no knowledge of boosted motors

What are your goals/ plans for the car???

The compression is fine, DEPENDING on the fuel you choose and amount of timing.

Will it have EFI or a Blowthru Carb??

If it were mine, E85 would be my first and only choice for several reasons. Cost, tuning window (compared to pump gas/meth), cooling capabilities (no intercooler needed). I would buy a 55 gallon drum of it if its not readily available in your area.

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post #20 of 23 Old 11-26-2012, 02:03 AM
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With a good tune and fuel, 10.5:1 is totally acceptable. The block will handle upwards of 1300HP, as long as your rotating assembly is forged up, it'll be quite a beast. I plan to go 10:1 on my 327 with Super T76.
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post #21 of 23 Old 11-26-2012, 08:17 PM Thread Starter
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I'm shooting for 8s, I have a good intercooler, Holley avenger efi with a dynamic racing c4 with transbrake, I plan on straight a c16 tune for the strip and just a healthy street tune.


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post #22 of 23 Old 11-26-2012, 09:43 PM
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Hope that C4 works for ya. It'll be close to the edge IMHO..

I plan on a TH400.

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post #23 of 23 Old 11-27-2012, 01:12 PM
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My little 284ci 4v is 10.0:1 and made 636 rwhp 606 rwtq on 13lbs of boost and only 12 degrees of timing at WOT on 93oct only....... Added water/meth and upped boost to 15.5lbs and power now is 702rwhp 670 rwtq.... The precision 7675 spools quick and boost hits like a twin screw when I shift and it re spools.
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