358 CI mod motor

[09bbbkgt]

Billet 67 will spool like 61's and flow like 76s up top.

ok thanks

 

[lito]

i guess with those size turbos it would spool a lil bit faster. What about 76s

You can go with those but that would be too big if you ask me right now, but until some math is done I can't tell for sure, I may be wrong.

My partner has twin 61s on a shitty 2V 298 (if he hears me he would kill me ) and is making 730rwhp at 18psi and turbos are way too big for his combo (too way left of the compression map, I don't how they don't surge)

If I am not wrong the 358 made 870@17psi with the 3.4L on our dynapack, add a couple of #s, ditch blower losses and some more proper race fuel tuning and you would be easily on the 1000s.

 

[09bbbkgt]

It would be a street tune and race tune setup. street tune wit 93 pump gas and race tune wit race gas. If it didnt make 1000 on street tune but did on race gas id be fine.

 

[Germeezy3]

It would be a street tune and race tune setup. street tune wit 93 pump gas and race tune wit race gas. If it didnt make 1000 on street tune but did on race gas id be fine.

So why would you not want twins where you could change boost on the fly. Heck you could even have a 0 boost valet setting if you want it.

 

[Mach1Marauder]

Had nothing to do with the sleeves, Bill. John told me personally that it wouldn't rpm worth a shit nor would it build middle rpm power. Even with four valve heads it had decent low speed response but not much power over a standard 5.4 engine. Higher up....same thing. Just didn't make a lot of power over the standard 5.4 setup.

Now....add boost, however, and it was a bad motherfucker.

Ahhhh.....I wasn't talking N/A............boring

So why would you not want twins where you could change boost on the fly. Heck you could even have a 0 boost valet setting if you want it.

WHat does twins and changing boost on the fly have to do with each other?

i guess with those size turbos it would spool a lil bit faster. What about 76s

For the street?.........no LOL!

 

[Germeezy3]

WHat does twins and changing boost on the fly have to do with each other?

You can't do that with a supercharger.

 

[white05gt]

You can't do that with a supercharger.

Don't say you can't, it's been done before.

 

[Germeezy3]

Don't say you can't, it's been done before.

To whatever boost level you want?

 

[US-1]

Billet 67's and be done with it.

 

[white05gt]

To whatever boost level you want?

Spin the blower close to max rpms and whatever boost the supercharger is capable of, then add the wastegate and boost controller. I'm not saying it's ideal but it can and has been done.

 

[US-1]

That works on a centrifugal. Not so much on a roots or twin screw.

 

[Germeezy3]

Billet 67's and be done with it.

So you agree with me? I think it would be the perfect combo of power up top and spool.

Spin the blower close to max rpms and whatever boost the supercharger is capable of, then add the wastegate and boost controller. I'm not saying it's ideal but it can and has been done.

Its not as easy or as ideal as with a turbo system, also why would you go through all of that trouble and still make less hp per lb of boost if you are looking at a big power / dollar build?

 

[white05gt]

I thought I typed the part about the centri but reread and I left that part out. Like I said, it's not ideal, just letting you know it can be done. Turbo is the way to go, knowing what I know now, I wish I went that route instead of my paxton.

 

[Germeezy3]

I thought I typed the part about the centri but reread and I left that part out. Like I said, it's not ideal, just letting you know it can be done. Turbo is the way to go, knowing what I know now, I wish I went that route instead of my paxton.

No biggie, I actually had PD blower on the brain...I was not thinking of centri blowers.

 

[Chris06GT]

Some of you people kill me.....

67's would be more ideal for street manners yes.... But if you think 76's want spool fast enough on a 5.4 based engine you are sadly mistaken....

You can't throw turbo's on an engine and say they don't spool fast so let's change them.... Many more variables in play.... Heads, cams, intake etc etc.....

A friend of mine is running a d-stroked 5.4, .020 over, ported Supercar heads, custom turbo cams with twin 76's.... Spool's better then you think.... 25lbs it made right at 1460.... And he plans to turn it up to 30-32.... Only pulled it to 7800 on that run and the motor was built to turn 9500 with ease.....

It can be done.... This car is street driven with a glide in it

 

[Dreadknought]

^^^^FML thats a hell of a motor...

 

[s8v4o]

So why would you not want twins where you could change boost on the fly. Heck you could even have a 0 boost valet setting if you want it.

Can you explain to me how you would have a "zero" boost valet mode? The least amount of boost you can run is what your wastegate is setup for. If you have a 10 PSI spring in it, that's as low as it can go. With a boost controller you can go higher, even on the fly, but not lower then what spring is in it.

Spin the blower close to max rpms and whatever boost the supercharger is capable of, then add the wastegate and boost controller. I'm not saying it's ideal but it can and has been done.

That works on a centrifugal. Not so much on a roots or twin screw.

Not just that but you'll be pumping an extra amount of hot air and possibly be running the SC on a part of the compressor map that's not ideal.

 

[lito]

thanks man i would appreciate it.

Here it goes.

That is with a 3.5" pulley on a 3.4L whipple.
Foxlake cnc'd FGT heads.
Livernois 358cid on FGTalu block.
On a pretty conservative tune with race fuel on 18psi avg.

 

[Germeezy3]

Some of you people kill me.....

67's would be more ideal for street manners yes.... But if you think 76's want spool fast enough on a 5.4 based engine you are sadly mistaken....

You can't throw turbo's on an engine and say they don't spool fast so let's change them.... Many more variables in play.... Heads, cams, intake etc etc.....

A friend of mine is running a d-stroked 5.4, .020 over, ported Supercar heads, custom turbo cams with twin 76's.... Spool's better then you think.... 25lbs it made right at 1460.... And he plans to turn it up to 30-32.... Only pulled it to 7800 on that run and the motor was built to turn 9500 with ease.....

It can be done.... This car is street driven with a glide in it

The OP said he is fine with around 1000 rwhp , billet 67's are going to flow up top as good as some of the old cast wheel journal bearing 76's and give you better boost response.

Can you explain to me how you would have a "zero" boost valet mode? The least amount of boost you can run is what your wastegate is setup for. If you have a 10 PSI spring in it, that's as low as it can go. With a boost controller you can go higher, even on the fly, but not lower then what spring is in it.

You are right I should have said low boost setting, and not 0 boost.

Not just that but you'll be pumping an extra amount of hot air and possibly be running the SC on a part of the compressor map that's not ideal.

He already said that it was not ideal.

 

[Chris06GT]

I agree with you... That's why I said the 67's would be better for street manners in my post... I just didn't understand why some people were saying running 76's is pointless...