LT1-LT4 Modifications 1993-97 Gen II Small Block V8

How many lbs of boost?

Old Jan 15, 2014 | 10:58 AM
  #61  
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Originally Posted by DUDCOUPE
You need 60lb injectors for 500hp?
Boost has much higher injector requirements then NA motors, and E85 is even more thirsty by ~30% so boosted E85 builds run insane size injectors. 60 is pretty small actually.

Originally Posted by SwampWS6
Ok last question. With the 70mm turbo and 80lbs injectors and all other mods, what hp area would you think I'd be in? Im thinking and hoping 450+?
Lol? Dude even with the small turbo and only ~6-8psi your TFS headed 383 will be over 600 crank and ~530rwhp through a manual.
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Old Jan 15, 2014 | 11:11 AM
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Originally Posted by DUDCOUPE
You need 60lb injectors for 500hp?
Not necessarily unless you are going forced induction.........
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Old Jan 15, 2014 | 11:13 AM
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Originally Posted by Puck

Lol? Dude even with the small turbo and only ~6-8psi your TFS headed 383 will be over 600 crank and ~530rwhp through a manual.
Woooohoooooo!!!!!!!! I'll drink to that!!!!!!!!!!!!!!!!!
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Old Jan 15, 2014 | 11:30 AM
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Just a thought but if the engine is as already out and your looking at changing head gaskets why not try to find someone to trade pistons with? Might be a long shot but you can maybe find someone in the opposite situation as you and make an even trade. You would have to be out maybe buying a new set of rings. Hell find a machine shop and see what they can do. They would usually have all sorts of parts laying around from other builds and could maybe help you in that sence. Like I said maybe a long shot but worth a try.
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Old Jan 15, 2014 | 11:37 AM
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Do not put that 91mm on there, with a manual you will hate life.

Good race car turbo, bad street car turbo.

You want around a .96ar, a PT7675 or 7875 turbonetics area.

Also, a T6 turbo will not work on a T4 kit, you will need a new flange and most def support added to hold that 91mm.
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Old Jan 15, 2014 | 11:41 AM
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Originally Posted by 96ssindeed
Just a thought but if the engine is as already out and your looking at changing head gaskets why not try to find someone to trade pistons with? Might be a long shot but you can maybe find someone in the opposite situation as you and make an even trade. You would have to be out maybe buying a new set of rings. Hell find a machine shop and see what they can do. They would usually have all sorts of parts laying around from other builds and could maybe help you in that sence. Like I said maybe a long shot but worth a try.
Only thing about that is having to block honed to those specific pistons. So the machine work was done and numbered according to what piston fits best to what cylinder. The trading pistons idea would make me susceptible to having piston rock which is never good, especially with FI. I appreciated the help in trying to lower my CR the right way............Lol
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Old Jan 15, 2014 | 02:05 PM
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Originally Posted by SwampWS6
Only thing about that is having to block honed to those specific pistons. So the machine work was done and numbered according to what piston fits best to what cylinder. The trading pistons idea would make me susceptible to having piston rock which is never good, especially with FI. I appreciated the help in trying to lower my CR the right way............Lol
Like I said just a thought lol. Ive done it before is why I mentioned it.
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Old Jan 15, 2014 | 03:35 PM
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If you are going to pump a lot of Boost into the motor the PTW clearance is going to be larger with each increment in power. So If you are building something that can be ran quite a bit harder then you will get piston rock even from a 4032 piston. A piston is almost like piston rings, enough gap so that even at the max power potential nothing is butting up against anything. The piston swap thing is an idea but the rotating assembly would need to be rebalanced.

Another thing is that Turbo motors love automatics the stalling allows the turbo to spool rather quickly. Manuals like centri and PD blowers.

If you aren't against nitrous it can really help the turbo spool at low speeds aiding the manual trans a bunch. Also the nitrous used in low levels would help keep that air nice and cool.
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Old Jan 15, 2014 | 04:36 PM
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Originally Posted by nitrous2fast
If you aren't against nitrous it can really help the turbo spool at low speeds aiding the manual trans a bunch. Also the nitrous used in low levels would help keep that air nice and cool.
Im not oppose to nitrous at all. HP is HP. The only thing is that I think meth is cheaper and more efficient. Now by meaning efficient, I mean I can get more of quantity when it comes to meth. I dont want to have to fill the bottle up every other day. I never actually really considered nitrous because I didnt think it would work the same as meth.(I knew it, but never put 2 and 2 together)

Since you brought it up, I'll do more research on it since im not a nitrous type of guy so its tons that I dont know. The reason im thinking real hard is because nitrous is guaranteed hp. I've watched so many dyno's and people only gained no more than 5hp with meth.......... But I guess that its serving its purpose and helping the engine run cooler.....
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Old Jan 15, 2014 | 05:56 PM
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Originally Posted by SwampWS6
Im not oppose to nitrous at all. HP is HP. The only thing is that I think meth is cheaper and more efficient. Now by meaning efficient, I mean I can get more of quantity when it comes to meth. I dont want to have to fill the bottle up every other day. I never actually really considered nitrous because I didnt think it would work the same as meth.(I knew it, but never put 2 and 2 together)

Since you brought it up, I'll do more research on it since im not a nitrous type of guy so its tons that I dont know. The reason im thinking real hard is because nitrous is guaranteed hp. I've watched so many dyno's and people only gained no more than 5hp with meth.......... But I guess that its serving its purpose and helping the engine run cooler.....
Stop thinking meth will be used to gain you power. If it is, your intake charge is poorly routed, or you have too small injectors for the power you are trying for.

Meth is a safety blanket for if IATs skyrocket, and in case a plug goes etc.

Otherwise, design it for using meth as additional fuel and you will gain HP on meth, but if the system fails, well, bye bye motor.

Nitrous in what you want is not gonna get you HP (well it will but meh). You will be staging, getting up to whatever launch RPM you want, and spraying say like a 25/50 shot to help get a large turbo lite off. Thats really it, once its spooled up you can usually stop spraying but could spray the whole track
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Old Jan 15, 2014 | 06:17 PM
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Originally Posted by Shownomercy
Stop thinking meth will be used to gain you power. If it is, your intake charge is poorly routed, or you have too small injectors for the power you are trying for.

Meth is a safety blanket for if IATs skyrocket, and in case a plug goes etc.

Otherwise, design it for using meth as additional fuel and you will gain HP on meth, but if the system fails, well, bye bye motor.

Nitrous in what you want is not gonna get you HP (well it will but meh). You will be staging, getting up to whatever launch RPM you want, and spraying say like a 25/50 shot to help get a large turbo lite off. Thats really it, once its spooled up you can usually stop spraying but could spray the whole track
Question, how is your fuel system setup?

Which is the safest to run? In you honest opinion (Even though you have meth)
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Old Jan 15, 2014 | 07:36 PM
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Originally Posted by SwampWS6
Question, how is your fuel system setup?

Which is the safest to run? In you honest opinion (Even though you have meth)
-10an sump off a stock tank, magnafuel 625, then stock hardlines, -6an braided up to a aeromtoive reg and aftermarket fuel rails with 80# injectors. Runs at 60psi base, and goes 1:1 with boost.

I like that I will know if a injector goes or the pump dies just driving round, but if the meth system dies at WOT, I would never know till I melt down a piston etc.
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Old Jan 16, 2014 | 11:42 AM
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Meth mix is a complete band-aid if needed on the street. Street trim should be able to be handled easily by the intercooler. The meth mix really should be used if pushing the setup hard at the track. So with that being said, Nitrous is a better option for the track; you get the massive cooling effects, extra hp, and a great ability to spool the turbo faster. The downside of nitrous is finding someone to fill the bottle. But in your case a 10# bottle with a 25-35 shot should last a long time.
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Old Jan 16, 2014 | 11:53 AM
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Originally Posted by nitrous2fast
Meth mix is a complete band-aid if needed on the street. Street trim should be able to be handled easily by the intercooler. The meth mix really should be used if pushing the setup hard at the track. So with that being said, Nitrous is a better option for the track; you get the massive cooling effects, extra hp, and a great ability to spool the turbo faster. The downside of nitrous is finding someone to fill the bottle. But in your case a 10# bottle with a 25-35 shot should last a long time.
I have a large enough IC to where im comfortable. I mean if im on the street playing around I should be fine with meth or nitrous. With street driving im not going to be running no more than 6-7lbs, in fact if im just driving it to work on nice days I will probably run less than that. Street racing (illegal) and at the strip I will have it running full on and run 10lbs+ with meth or nitrous.

Im not using the meth as a band aid, just as a safety precaution. Using it as a band aid is running 10lbs+ everywhere I go and driving it like its on fire all the time.

Im just weighing my options on nitrous and meth...........

What do you see as the pros and cons of each?????
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Old Jan 16, 2014 | 11:54 AM
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Originally Posted by nitrous2fast
Meth mix is a complete band-aid if needed on the street. Street trim should be able to be handled easily by the intercooler. The meth mix really should be used if pushing the setup hard at the track. So with that being said, Nitrous is a better option for the track; you get the massive cooling effects, extra hp, and a great ability to spool the turbo faster. The downside of nitrous is finding someone to fill the bottle. But in your case a 10# bottle with a 25-35 shot should last a long time.
But.. those late night blasts on the road to Mexico...
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Old Jan 16, 2014 | 12:02 PM
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Nitrous pros are the massive cooling effects and Hp gain. Also you have the ability to up the shot for even more HP. The cons are availability and price.

water injection/meth is good for cooling the charge down and can be ran at a certain boost level with a low amount of cost but still cost. Also once the tank is empty it is empty just like nitrous. Pros is that you can run some washer fluids.

Those late night blasts to mexico n e v e r h a p p e n e d. . . . . . . .
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Old Jan 16, 2014 | 12:21 PM
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Originally Posted by nitrous2fast
Nitrous pros are the massive cooling effects and Hp gain. Also you have the ability to up the shot for even more HP. The cons are availability and price.

water injection/meth is good for cooling the charge down and can be ran at a certain boost level with a low amount of cost but still cost. Also once the tank is empty it is empty just like nitrous. Pros is that you can run some washer fluids.

Those late night blasts to mexico n e v e r h a p p e n e d. . . . . . . .
Could you just run straight alcohol injection?

Its sounding like I would be more beneficial with nitrous........
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Old Jan 16, 2014 | 03:01 PM
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Just get the thing going and then decide IF you need water injection. If you are running E85 then you are much better off than if you were running 93 pump gas. So get the build running and then see if the intercooler is keeping the charge down or not.
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Old Jan 20, 2014 | 09:47 AM
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Originally Posted by Shownomercy
I run an old PT76gts

A 70mm will be pumping your motor full of hot air well before 6k rpm...
With the 70mm, my a/r on the turbine was .63 which is more suited for an import and not for my cubes.

Well you had got me thinking, and I bought the T6 92mm and it was waaay to big(65lbs) for my application, so I sold it and I will be running a ball bearing 78mm with 75mm turbine wheel with 1.15 a/r.

I started specking out turbos in general and learned a lot more about them and this will be perfect for my application.
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Old Jan 20, 2014 | 10:52 AM
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Originally Posted by SwampWS6
With the 70mm, my a/r on the turbine was .63 which is more suited for an import and not for my cubes.

Well you had got me thinking, and I bought the T6 92mm and it was waaay to big(65lbs) for my application, so I sold it and I will be running a ball bearing 78mm with 75mm turbine wheel with 1.15 a/r.

I started specking out turbos in general and learned a lot more about them and this will be perfect for my application.
I would stick with a .96a/r personally but an auto car would do better than a stick car with the larger a/r

Turbonetics unit right?
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