CALL911

iTrader: (17)

When you say you don't think I'll be able to run that much, are you referring to the amount of boost through the turbo? How much boost can you reliably/consistently get out of the S475 or the PT7675?

Or did you mean you don't think I'll be able to run that much boost safely?

Preston99WS6

iTrader: (7)

I know of a guy local thats doing it. Its a street car too, only difference is he is running a 5.7 and 10.5:1 with a bigger turbo in a fox body, so its doable but the tune needs to be spot on. Running meth should knock the IAT's down, especially if you are going to run a intercooler.
I would run pure meth because it will knock the temps down better and will give that 93 more octane depending on the nozzle size it should bring the octane rating up to near 110. I run a M8 nozzle (800cc) buy a wide band and keep on eye on the air fuel ratio. Although putting that kind of power down on the street is another issue all together his car pretty much goes on kill mode at the track and then the boost is turned down for the streets.

That motor rode out like that for three years before it gave up. Theres another in it now it was and the new one are stock internals.

Preston99WS6

iTrader: (7)

Here's a link to a new S475 from custom racing turbos. Cheaper than what you quoted above too.

Chris is a great guy to work with too and stands behind his stuff.

http://stores.customracingturbos.com...-T6/Detail.bok

4SFEDZ

iTrader: (6)

Don't think a stock 5.3 can handle it. Turbo might make it.

CALL911

iTrader: (17)

Thanks for the info Preston. I want something rock solid reliable. Not something that probably could be done, but would be on the edge. I am also contemplating going with a 6.0 block instead of the 5.3 block. Price seems to be not much more, and gives more options on pistons and with the larger displacement, more boost may not be required to hit my power goal.

That being said, I think I might feel safer running a lower CR in at least the 9.5:1 or even 9:1 range. Any thoughts on this?

Preston99WS6

iTrader: (7)

It will for awhile, the big advantage of turbo charging is you can turn the boost up and down so it wont be seeing this abuse 100 percent of the time.

But it is a time bomb, but then again so are built motors they just have more time before they go boom.

CALL911

iTrader: (17)

Gotcha. Thanks for clarifying. When I mentioned it would be a budget build, I should also mention that it wouldn't be completely stock. 5.3 or 6.0 I would do rod bolts, main/head studs and some good rods and pistons.

Turnin20s

iTrader: (12)

You could possibly find a set of 317 heads and that would drop the compression.

But if you are planning on building a 5.3 with rods and pistons you may as well buy a 6.0 and go that route IMO.

The 4.8/5.3 blocks are suppose to be stronger than the 6.0 blocks due to thicker cylinder walls. And most guys are using them because they are generally 1/2 the price.

I would say that you would be ok with that much boost and e85, but pump and meth I think you would be pushing your luck. But maybe a quality intercooler would make a difference.


And sorry for cluttering your thread before, just thought I'd share since they will be similar setups.

CALL911

iTrader: (17)

I'm all about a good meth injection and an intercooler. However, I am not going to hack up my front bumper so air flow to the FMIC will not be optimal. I will likely do the same thing I did on my Z28, and run an air duct from underneath to help direct air flow to the FMIC.

I don't want to go E85 because E85 has different blends. Meaning I will need to have a way of not only testing for the different blends, but adjusting the tune for them as well. It's just too much of a PITA.

So, I will do the meth, and FMIC and make the rest of the difference to keep me away from detonation with a lower CR. I am thinking 9.5:1 or 9:1 should do it.

I have a source that I can get both the 5.3 or the 6.0 for not much money at all. The difference between the two is about $100 from my source. At that point, it's just a matter of what would be better. So, unless you think I might be more reliable running more boost with the thicker 5.3, then I will go with less boost and the 6.0. Even with the 6.0 and less boost, I am guessing I still may need to hit 20 pounds or more of boost in order to achieve the 850 RWHP goal.

Sarg

iTrader: (6)

Ha, I am going to attempt 800s on a stock rod, piston and crank 5.3 aluminum block, but will be doing so on E85.

CALL911

iTrader: (17)

You may very well be successful. Then again there's an equal to greater chance it may not last.

I am going to keep things on the safe side by building it up a bit more than stock.

ricky6991

Selling my whole turbo kit for 1500! Its as budget as youll get for the parts. Brand new s472 BW with fuel pump/reg n jgs wastegate 60mm , fmic, bov.

CALL911

iTrader: (17)

Ricky, I am looking for 800-850 RWHP. Although what your selling may be a good deal, I doubt the smaller 72mm turbo you are selling will get me there. I am not even sure the larger S475 will do the job. I may need to go to an 80mm turbo to reach my power goals.

skinnies

iTrader: (33)

Precision 7675 will do it with ease, we've proved that on several JY 5.3 builds.

Sarg

iTrader: (6)

We shall see! I hope you are wrong, but the good part is it is just a $250 short block that has been cleaned up and had a cam thrown in it.

CALL911

iTrader: (17)

Do you mind if I pick your brain a little? What setups were the 5.3's? And what RWHP did they make? Did it take E85 or race gas? If I can just see a few combos on the 5.3 with that Turbo making 800-850 at the wheels, it would give me more info that I need to start.

Boosted Firehawk

iTrader: (11)

e85 on a stock fuel rails Skinnies has done too. I was told 3 fuel pumps and only aftermarket rails, lines to the rails and a boost ref. regulator. Over 800hp on e85 and STOCk lines, which vendors and a few others say CAN NOT happen. He proved it with a few cars for sure.

Hank Peabody

iTrader: (2)

That one is the standard turbined one and T6, not comparable to a PT7675 like the more expensive T4 smaller turbined one listed above for $900.

CALL911

iTrader: (17)

My biggest thing is attaining my goal within the criterea listed (pump gas, meth injection, FMIC, 800-850 RWHP). I need to see a few combos on peoples cars that have done this, and see what their exact setups were.

I say more than one or two, because we all know how you can put almost an identical setup on two different cars, and end up having different results. Skinnies is the #1 highes RWHP 5.3 on the list here in the FI section, and he did 855. Other than him, there are only 3 other guys who have broke the 800+ mark out of the 5.3. When you have so few guys doing it (or maybe there are more that just haven't posted on the list), I find it possible that I may not be able to get there how I want to with running pump gas, and staying fairly inexpensive on the build. I would hate more than anything to copy someones setup, and then in the end with everything maxed, NOT attain my power goal. I want to be sure I can hit it, with little to no question. If I need to go bigger to the 6.0 I can. But if I can do it with a 5.3 and a PT7675 I would love to.

skinnies, if you get the chance, please let me know what the info was from the cars you spoke of.

Hank Peabody

iTrader: (2)

Is everyone making over 800whp with a 5.3 using e85? Anyone on 93 oct gasoline doing it?