APS,Stock Bottom End, 110 octane??
APS,Stock Bottom End, 110 octane?? 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.
. 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. 
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.
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.
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.
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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???
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???
lol. I'm deployed right now and saving money so if I grenade it, iron 408 it is 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.
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!!
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!!
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..
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.
.
. I'll def keep you guys posted when thime comes.. 
TECH Fanatic
Joined: Jul 2002
Posts: 1,218
Likes: 1
From: MI
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......
Just put the money into some forged pistons and rods now instead of spending double down the road because of your current greed......
