how much psi running half 92 and half 110

DeezNutsForYou · 04-30-2003, 12:38 AM

I have a stock fuel system and I want to run half 92 and half 110. Some people claim they run 22 psi on straight race fuel, but I only want to run half race fuel. Would 18-19 psi be safe, really safe. I don't want to risk anything, I keep it at about 16psi for daily driving. Do I need to rewire my fuel pump also. Thanks for answering my noob question. And I would prefer only people that have actual experince using race fuel to respond. (no hard feeling for anyone else)

One more thing, is there any harm on my engine running half race fuel, or what about running straight race fuel? Any longterm damage, maybe piston cracking or burned pistons.

DSSA · 04-30-2003, 06:25 AM

It all depends on your setup and tuning. A few of us have/do run 27 psi on pump gas with no problems. Only way to tell is to monitor EGTs/Knock/timing/02s (prefferably with a wideband on a dyno) to figure out what peak "safe" boost is for your car.

allwheelTSI · 04-30-2003, 08:08 AM

Quote:

Originally posted by DSSA
It all depends on your setup and tuning. A few of us have/do run 27 psi on pump gas with no problems. Only way to tell is to monitor EGTs/Knock/timing/02s (prefferably with a wideband on a dyno) to figure out what peak "safe" boost is for your car.

you run 27psi on stock fuel system with your 14b huh? you sound like just the kind of person that he did'nt want responding to this thread.

with half and half,i'd say 17-18 would be about the limit with the stock fuel system,unless you're a damn good tuner. a fuel pump rewire would be a good idea.

nowayout · 04-30-2003, 09:17 AM

He was saying pump gas? Not stock fuel system.

allwheelTSI · 04-30-2003, 09:54 AM

Quote:

Originally posted by nowayout
He was saying pump gas? Not stock fuel system.

perhaps,but.. the situation in question,is stock fuel system,and even on c16 the 14b is highly inefficent at 27psi.

DeezNutsForYou · 04-30-2003, 01:24 PM

you can actually get your 14b to push 27psi, I thought they topped out at around 23-24. And is c16 the same as unleaded 110. And as fas as tuning goes, I have no safc and no monotoring system yet, net even a egt. Which I will hopefully soon be getting, but probably not till the end of summer, but I wana run my car at the track before then. So I guess I'll rewire my fuel pump and keep it around 18psi. Does anyone have any other suggestion, that they got from experience?

DSSA · 04-30-2003, 04:58 PM

Quote:

Originally posted by allwheelTSI

you run 27psi on stock fuel system with your 14b huh? you sound like just the kind of person that he did'nt want responding to this thread.

with half and half,i'd say 17-18 would be about the limit with the stock fuel system,unless you're a damn good tuner. a fuel pump rewire would be a good idea.

If your reading comprehension skills were up to par with your ability to try to run your flaps, you'd have noticed the very 1st statement of my post "It depends on your setup and tuning".

He said "Stock fuel system". He didn't state what turbo or anything else he had on the car.

As far as your "you sound like just the kind of person her didn't want responding to this thread", I would be willing to bet I've got more C16/Pump/Tuning/Dyno time on various customer cars than you've got in your own..let alone mine.

My post was in no way/shape/form trying to tell him to run 27 psi in his car. My point was that in order for anyone who knows what they're doing to adequately tell him what *SHOULD* be safe for him to run, he'd need to dole out more information.

Stock fuel pump, no rewire, 2.5 downpipe/test-pipe, 02 dump, porting, and an adjusted MAS on my 1st '92 GVR4, I was running 20-21 psi on pump gas. Does that mean that if he does, he'll be safe too? Depends on a lot of factors. Do I know anything about his car other than "stock fuel system"? No. Would one need more info to tell him accurately (and even at that point, without monitoring how the car reacts, at best a guesstimate), yes.

Get the point now?

allwheelTSI · 04-30-2003, 06:44 PM

Quote:

Originally posted by DSSA

If your reading comprehension skills were up to par with your ability to try to run your flaps, you'd have noticed the very 1st statement of my post "It depends on your setup and tuning".

He said "Stock fuel system". He didn't state what turbo or anything else he had on the car.

As far as your "you sound like just the kind of person her didn't want responding to this thread", I would be willing to bet I've got more C16/Pump/Tuning/Dyno time on various customer cars than you've got in your own..let alone mine.

My post was in no way/shape/form trying to tell him to run 27 psi in his car. My point was that in order for anyone who knows what they're doing to adequately tell him what *SHOULD* be safe for him to run, he'd need to dole out more information.

Stock fuel pump, no rewire, 2.5 downpipe/test-pipe, 02 dump, porting, and an adjusted MAS on my 1st '92 GVR4, I was running 20-21 psi on pump gas. Does that mean that if he does, he'll be safe too? Depends on a lot of factors. Do I know anything about his car other than "stock fuel system"? No. Would one need more info to tell him accurately (and even at that point, without monitoring how the car reacts, at best a guesstimate), yes.

Get the point now?

no,i don't get the point,its called a mods list.. its in the profile,and you were runniong terribly lean at 21psi with a stock fuel system and not even an AFC. of course you have more c16 tuning time than i do,i do most of my tuning on the street,and don't wanna pay 5/gal. for the local 1/8th mile track. all i said is the 14b runs out of steam at 25psi,even on c16,and at that you need a FMIC. i'm not questioning your tuning time or skill,simply stating facts..i can run low 13's with my 95% stock FWD laser,blah blah blah.. i really could'nt care less about what you have done. so go be a smartass to someone else,i'm not the guy you wanna act like that towards. have a nice day.

DeezNutsForYou · 04-30-2003, 08:23 PM

I have a completely stock fuel system, no way to monitor anything,(except a flashing light on my A/F), and no way to tune. So that said, can I run 18 pounds on half race, half super?

tallywacker · 04-30-2003, 09:06 PM

18 would be max i do this often i dont have an afc either. i wouldn't go over 19 with full race gas. i have done 18 safely without any harm so you should be fine. but its always mixed with sunoco 94 pump gas. 110 im assuming its leaded will eat away at your cat and your 02 sensor over time but i havent had a problem with it on my car yet

DSSA · 04-30-2003, 10:35 PM

Quote:

Originally posted by allwheelTSI

no,i don't get the point,its called a mods list.. its in the profile,and you were runniong terribly lean at 21psi with a stock fuel system and not even an AFC. of course you have more c16 tuning time than i do,i do most of my tuning on the street,and don't wanna pay 5/gal. for the local 1/8th mile track. all i said is the 14b runs out of steam at 25psi,even on c16,and at that you need a FMIC.

Ahh, then you might want to read the beginning thread. *YOU* are the type who he didn't want answering. (glass houses, throwing stones...). And actually, I *wasn't* running lean.

Quote:

[i]
i'm not questioning your tuning time or skill,simply stating facts..i can run low 13's with my 95% stock FWD laser,blah blah blah.. i really could'nt care less about what you have done. so go be a smartass to someone else,i'm not the guy you wanna act like that towards. have a nice day. [/b]

Actually, you are the type I want to act like a smartass towards.

Smartass comments, beget smartass comments.

DSSA · 04-30-2003, 10:43 PM

Quote:

Originally posted by DeezNutsForYou
I have a completely stock fuel system, no way to monitor anything,(except a flashing light on my A/F), and no way to tune. So that said, can I run 18 pounds on half race, half super?

I would suggest buying an EGT guage and/or at least hooking up a voltmeter to the 02 wire in the pass. side kickpanel to keep an eye things.

18 psi on half 110/half 93 should be fine though.

You can probably turn it up a bit with this mixture, although, like Tallywacker stated, if you have a cat, it and the 02 sensor are going to become clogged over time.

Using the 02 wire by itself is a rough idea, but at least you have something to go by.

You can also adjust the MAS to try to compensate if you find that you're running a bit on the lean side.

The next time you change plugs, you could put the new ones in, max a decent pull in the car, then pull over and pull them out. Check for detonation this way as well.

You can never know too much about what the conditions are like in your motor....

DeezNutsForYou · 04-30-2003, 11:02 PM

The guy at the 76 station told me they sell leaded 110 for $4.50 a gallon, but if I wanted, he could order me some unleaded 110 for $5.50 a gallon. Unless he's full of shit, I think its unleaded. And how do you hook up a volt meter, what exactly are you looking for? And I think I'll rewire my fuel pump to be safe, it looks pretty easy. But how do you know what your monitor your knock. And I think it would really help to run my IC water sprayer the whole 1/4, that should cool things down a lot.

Thanks for the help, I really appriciate it.
Keep it comin

Ha Ha

DeezNutsForYou · 05-01-2003, 05:49 PM

Does anyone know if running race fuel has any negative effects on your car, in the short and long term