Suggestions on built short block and compression ratio?

[FRS Justin]

Call Your Tuner!!! They Will Know!!!!!

[SoCal80six]

Originally Posted by Sportsguy83

If you plan on truly staying with E85 and not going over 20 psi, I fully recommend you keep the 12.5:1 stock ratio. Only reason to lower comp. is if you're going for the big power (25+ psi) and/or need to get off E85 and run just pumpgas.

Yeah heard that from a few people. Won't be on e85 all the time though will be switching between 91 and e85. And I'm still stuck on choosing just want the safest setup with good power and room for better power.

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[SoCal80six]

Originally Posted by FRS Justin

Call Your Tuner!!! They Will Know!!!!!

Yeah already talked to Zach at delicious and he recommended me staying with the 12:5. But kind of hesitant, was running tune by them and over boosted. Didn't know it didn't have over boost protection and the last thing I'd want is to spend even more money. Already have to do a rebuild now don't want to have to deal with it again.

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[Sportsguy83]

Originally Posted by 350matt

sorry but 20 psi is quite a lot of boost E85 or not and there's not a manufacturer out there running CR over 11:1 on a boosted engine
drop the ratio to 10.5:1 and you'll have far more headroom against detonation and not have to swing the cams out to lower the dynamic ratio

look at the rest of the industry and consider that the hundreds of engineers and talent applied to those engines and ask yourself why none of the comtemparies are running high ratio and high boost

Manufacturers do not build forged internal engines for the most part.

This thread is about forged internals designed to withstand way more than 20 psi of boost/ 500 whp/ 400 wtq.

All E85 does is give you a huge detonation free window. As long as you don't knock, the forged internals designed to take much more than 500 whp/ 20 psi will be just fine.

Heck, I am running stock unopened motor E85 552 whp for almost two years now.

There's really no need to increase lag and hurt the out of boost performance of the engine going with lower compression as long as you plan on having the knock resistance of E85 when going with the full boost (20 psi) map.

[Sportsguy83]

Originally Posted by SoCal80six

Yeah heard that from a few people. Won't be on e85 all the time though will be switching between 91 and e85. And I'm still stuck on choosing just want the safest setup with good power and room for better power.

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It's fine if you won't be at full power all the time. Get a flex fuel kit and have boost by map setup, or boost by E% content. That way when you go on 91, the ECU can adjust you to a low setting map, say 10 psi lower timing etc... then on E85 killer mode 20 psi, etc...

Best of both worlds, no need to compromise.

[SoCal80six]

Originally Posted by Sportsguy83

It's fine if you won't be at full power all the time. Get a flex fuel kit and have boost by map setup, or boost by E% content. That way when you go on 91, the ECU can adjust you to a low setting map, say 10 psi lower timing etc... then on E85 killer mode 20 psi, etc...

Best of both worlds, no need to compromise.

Yes already have flexfuel kit to.

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[EAGLE5]

I strongly suggest 6:1 and half a dozen of the other.

Problem with a delicious tune is you apparently don't know what you are getting. More your fault than theirs but sealed tunes are sealed.

Go talk to somebody who does the total package. Including building the engine and tuning.

[-Phil]

We have done a couple of FA20 builds this year, including mine. on my personal car i also run the MAP turbo kit (which is fantastic) but i am running a 3076. For my setup we went with a 11:1 compression ratio which worked out great for us

Best regards,
-phil

[FRS Justin]

Originally Posted by SoCal80six

Yeah already talked to Zach at delicious and he recommended me staying with the 12:5. But kind of hesitant, was running tune by them and over boosted. Didn't know it didn't have over boost protection and the last thing I'd want is to spend even more money. Already have to do a rebuild now don't want to have to deal with it again.

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I've run DT tunes for years set records with them and never had a problem. I would bet my house on you having a failing part, check your wastegate and lines check your mac valve too one piece of dirt in that valve and its game over. Im running 10.5 comp but I'm boosting over 30 psi too. 12.5 for 500hp or less will be fine. Or 12.5 for 20psi or less with E85 with 91 I wouldn't boost past 10psi personally.
I truly feel its not the tune, they don't just work one day and change the next, it has to be mechanical. Also do what I do and get a stand alone boost controller /protector that lets you control the boost and everything about it. I run a AMS 2000 Pro and love it!!!!!!!!!
Call Jeremy at Outfront Motorsports in Buena Park tell him I sent ya and to give you that big brother hook up on a motor and then cal Ian at MAP and tell him hook you up on a boost controller turbo smart isn't that expensive and work good. Mark at Spencer Fab runs one and likes it I believe Outfront stocks them too.

[spitfire481]

I've never had an issue with my ecutek setup. Closed loop boost control and boost cut, standard Mac valve with push loc hoses/fittings. I melted the rubber wastegate line back when I had my avo kit and the ecutek boost cut worked flawlessly

[weederr33]

What about for a built motor running a supercharger, what compression ratio would be good? I was looking at 10:1 compression.