KnightmareLS1

iTrader: (12)

Like the title says, I have an APS car running 8 psi with a stock bottom end. When I get home on R&R I was planning on putting some 110 in the tank,pushing 12lbs, and gettin some glory dyno numbers. I was wondering, do I need to pull any timing? It's only got about 12-14deg right now,AFR is 11.4 at WOT,pulling it to 6800rpms. Numbers on 93 are in my sig. Any advice is helpful.

Big_Bird_WS6

iTrader: (7)

what is your compression?

KnightmareLS1

iTrader: (12)

That's a good question lol. It's still high, should be around stock or maybe a little higher. When I got it, it was a heads/cam car and the owner didnt know if they'd been milled or not. I'm not sure of the chamber size.

MosesMcgregor

iTrader: (16)

good numbers but sounds like you're rollin' the dice. I'd bump octane or run straight meth injection if you're going to run over 7 or 8 psi.

corpserodeo666

iTrader: (12)

I second that. I'd run straight meth for the ultimate results. Also which APS kit are you running? I'd also do so research before you push the boost on those things, it can be deadly! Don't want to scare you but just wanted to give you a heads up.

KnightmareLS1

iTrader: (12)

I guess my question is can I run 12psi on the same tune I have now, but put 110 octane in it instead of 93? A place right down the street from me sells 110 unleaded from the pump for $5.99/gal. I just wanna bump up the boost for a few dyno pulls and then bring it back down to 8psi.

hellbents10

iTrader: (10)

As long as you have enough fuel for 12lbs it will be fine on 110 with only 14deg. You running SD or MAF tune?

KnightmareLS1

iTrader: (12)

I have a Racetronix 255 kit with the hotwire add on. Think thats good enough? Oh, and 60lb injectors.

MY99TAWS6

iTrader: (3)

I would think you should be fine with the higher octane and that amount of timing and that afr.You could go down a bit richer on afr and also a bit more on timing ,its hard to know exactly every car is a bit different and maybe you have 11 to 1 compression who knows? You really should be monitoring the engine especially for knock retard,afr with wideband,those two things for sure.
I would think 60s and the pump might get borderline at the higher boost levels more so likely the single pump.You can usually push injectors especially the seimens past 80% for short amounts of time with no ill effects.

I wouldn't personally be doing any stuff like this on stock bottom engine unless you have money in the bank for rebuild or new motor. I have seen far too many broken ringlands on stock bottom FI builds. Not my cars as I didn't put my kit on until had my built 6.0 as knew would get tempted to crank it up ,boost is very addictive and so easy to just dial it up.

Anyway be interesting to see what numbers you get .Best of luck. And you are running the kando centers now right???

KnightmareLS1

iTrader: (12)

Yep, Kando centers lol. I'm deployed right now and saving money so if I grenade it, iron 408 it is Maybe I should only try 10psi? haha.

MY99TAWS6

iTrader: (3)

Well if you got the money for a 408 I say go for it! I would think with high octane it should be fine for a few pulls. Some guys do run pretty high boost for a long time on stock engines.

Josh@PremierAutosports

iTrader: (11)

I have one locally that I tuned. Its been at 640whp over 2 years and recently did 670whp at 12-13psi. Bone stock ls6.

ohshixgoat

iTrader: (14)

I dont think you will have enought fuel for 10+ pounds. might have to go to a double 255 setup

SLOWWZ28

iTrader: (1)

I agree, I have an aps car w/less power than that and lonnes twin intank and thought I could get away with just the one pump for low boost but I went lean at about 5500! So I installed the hobb switch to run the second pump and it was all good! I say try 10psi and watch the afr, go from there. Great #s for 7.5psi and stock cubes! Will be awaiting results good luck!!

ohshixgoat

iTrader: (14)

I made 608 rwhp on a shot with 1 single walbro, but normally a fi car will run out of fuel between 550-600 rwhp with 1 single walbro..

KnightmareLS1

iTrader: (12)

Thanks for all the replies guys :-). I guess I'm on the ragged edge when it comes to fuel then lol. Looks like I'll be adding a second pump and Hobbs switch over leave. I'll def keep you guys posted when thime comes..

Mike 01WS6

Why take the chance on junking your ported heads when you blow the ******.....cuz it will blow.

Just put the money into some forged pistons and rods now instead of spending double down the road because of your current greed......

InsaneDomestics

iTrader: (28)

+1 I would have to agree. It would be better to Forge the bottom end now then have to Forge the bottom end & possibly have to buy new heads later.