Big_Bird_WS6

iTrader: (7)

will the LG upgrades support a 427?

if not what do i need to go to get forced performance to do a upgrade.

thanks
D

MY99TAWS6

iTrader: (3)

I thought you have a built ls3?
Or is it a 427.

Couple things usually determine if turbos can support such and such an engine size.
Airflow of the turbos and rpm limit is another one. If you are not going to be spinning the 427 to 7500 but maybe to 6500 then it can make a difference.

So far I think pretty much everyone with the LG upgrades in on smaller 402/408 sizes. Not sure if anyone is running a 427 yet. I kicked around buidling an LSX but decided that realistically anything over 1000 engine hp and for sure anything over 1000rwhp is just absolutely a waste of time for any car that is not pure track car and really think you would have to start backhalving the car to have any chance of hooking up with plus 1000rwhp.

I am running around on maybe 750 engine still on the small aps stock turbos on my 408 and realistically can't hook up that great even on drag tires like my toyo tq or et street radials on the street. I would think at 800 plus rwhp you will be spinning them at 100mph and maybe even higher with plus 1000rwhp.

Have you been in a car with plus 1000rwhp? Have you driven one?
The LG should support around 1400 engine hp. For sure in a 408 would think possibly in a 427 where likely you would redline less. I wouldn't be too afraid to spin my 408 to 7000. I would think 6500 is lots on a 427 build.
Nitrous is also another answer if you want more power occasionally. I can mix and match my spray and boost but seriously don't see going past 800rwhp on the street and 1000rwhp at the dyno for bragging rights. I am going to be trying out gear based boost ramping but seriously doubt its still going to be hooking up too good on the street.
With a 427 and its even more brutal on and off boost torque would be even harder to hook up unless maybe guy runs like 2.73 gears or something. Personally I hate the feel of low numerical gearing off boost. They might load the turbos up faster don't really care. Turbos spin up plenty quick for me as is with 3.54s and the 3.54s feel a lot better to me off boost around town and you aren't in boost that much in town unless you like jail.

But I guess its kinda of the same money if you say get the LG upgrades for you existing APS kit or maybe sell the kit for 3k or whatever and then maybe try the new Modular kit .
The modular does sound like it has more options and may have fixed some of the aps problems. Not sure am big fan of water to air intercooler and I seem to have fixed most maybe all of my aps little problems on my car.

Decisions ,decisions..eh?

MY99TAWS6

iTrader: (3)

Here found this just quick search..

https://ls1tech.com/forums/forced-in...1040-rwhp.html

Big_Bird_WS6

iTrader: (7)

i do have a LS3(377),

but i have a customer that wants to buy my APS kit. and we are building a 427 for it. and then LG upgrades.

the motor would be a
427
afr 225 heads
ls2 intake
shift at 6500 rpm


and i called LG. they said there upgrades will work with a 427

MY99TAWS6

iTrader: (3)

I just posted that link to a 427 showing them working fine.

Hope your modular or whatever kit you get works out for you.

So shouldn't he be running 6 bolt heads, I sure would if I was running a 427 lsx or mabye his is an ls2 or ls3 and if so wouldn't they be too thin wall in that size. Or are these ERTL or whatever builds.I guess then it would be fine.

Big_Bird_WS6

iTrader: (7)

it is a ERL 427. let 18-20psi be the highest. ERL said i would not need the 6 bolt heads.

WARPNOVA

iTrader: (3)

Awesome, I was just about to post the same question as you Big Bird WS6. I am working on getting things setup to do an ERL 427 with the APS LG upgrade option and wanted to know if I should have ERL quote me a smaller sized engine or just use their standard 427 superdeck option. There is just something about saying 427 TT that makes me smile and for a street machine just sounds like fun.

Thanks also MY99TAWS6 for the good find, I now feel good about my decision.

Good luck to us all.

Big_Bird_WS6

iTrader: (7)

biggest reason customer wants a 427 is to say it has a 427. ERL has some price on 402-454 so why not right. lol.

WARPNOVA

iTrader: (3)

Exactly what I was thinking. I am all for trying to use the most efficient motor size for the turbos that I will be using but like you said the 427 costs the same as a 402, 408 so if I won't be hurting myself for my intended use then why not. LOL And the cool factor when you go to the car shows and people ask what’s in it, the look on their faces when you say a 427 TT will just be priceless.