30# of boost, few questions

[TwinyTwin]

last weekend I went to the dyno to get my car tunned and put down 321hp and 301 tq with a a/f curve at 13.9. We could not lower the a/f with out running really rich on the low end of WOT. So tonight I was tinkering around with the car and put in a new fuel pressure gauge and adjusted my fuel pressure about 2 psi. So originally, it was 40 with the line on the day of the dyno and tonight at 42 with line on and 47-48 with line off. Took the car for a spin after warming it up and saw 30psi . Instantly I let off because something was not right and my chip is not burned for this ( turbo tweak chip 93 oct, 17-19 psi) but I did not see any knock on the scanmaster or hear any. I dont know what my o2 volts where because I was paying to much attention to the road and the boost gauge. I came to the end of the road and pulled a U-turn and stepped on it again, this time I saw 25 psi and about 1.2 degrees of knock. o2 volts the same as the first run, was not paying much attention to it. So my question is, did I do any damage to my engine while seeing 30 psi, knowing that my chip is not burned for that much boost?
Thanks for your time.

 

[DMan]

Provided you didn't get any sustained, runaway knock, I doubt you caused any damage. We routinely run 25-30 psi with water alcohol on stock engines.

 

[TwinyTwin]

Is it ok to run more boost than what the chip is set for? I ask this because I would like to run a little more boost than 19psi than what the chip is designed for with out having to get another chip.

 

[Fuelie600]

Yes you can. With a adjustable FP reg, and sufficient octane. Brian

 

[turbo2nr]

Once the MAF gets maxed out, which is around 18-20PSI on most cars, the computer will stop adding fuel, unless you have a chip burned to keep adding fuel. So, no, I would not run more boost than the chip calls for, unless you are spraying alky or just like having trouble.

 

[1 RARE T]

It sounds like the hose blew off the wastegate. I'd be checking that.

Next thing is to figure out why it only makes 300ft/lbs.

 

[TwinyTwin]

I'll check the hose to the waste gate tonight but I dont believe it came off.
The only reason we did not see more than 321hp and 301tq is because we let out early due to running lean but after last night, running 30psi, no knock and adjusting the fuel pressure only 2psi.... that raises a few concerns. thanks for the info guys.

 

[pacecarta]

with erics chip if you want to run more boost you can add fuel up to 10% using the chip and not have to touch the FP regulator, so watch your O2s and add accordingly.
and you can take out 1 degree of timing , now if you add octane (race fuel or alky) you can bring the timing up 4 degrees
in low gears you can tolerate more boost on less octane but you still need fuel
with erics chips fp should be started at 42 line off and then adjust accordingly based on your BLM,
with 48 psi of base pressure you arent leaving much room for running boost
your line pressure when you hit 30 would have been 78psi and odds are your pump wont keep up with that and you will go lean , if you want to run more boost i would lower the base pressure and increase the fuel in the chip

on the comment of once the MAF maxes at 255 the computer stops adding fuel , thats totally wrong , the fueling continues if it didnt there would be lots of blown up motors , my car sees 255 before i get 1 foot off the line , eric uses other methods to control the fuel than MAF one you go WOT.

if you have a question concerning your chip dont go by what others who dont run his chip tell you just call eric and discuss it with him.

 

[turbo2nr]

Most street chips, like the Red Armstrong 93, will not add fuel beyond a certian point. Period. So to say you can run more boost with any chip is wrong. I have plenty of race chips that add fuel differently, and don't really use the MAF, but that's for another thread.

 

[VadersV6]

LS1 MAF.
Translator.
Extender.
No pegging MAF issues.
Assuming you dont hear any knocking of death, Im sure the engine is fine. I would pull all the plugs and look for the little dark grey/silver speckles on the porcelain indicating detonation. Just give them a good look over. They can tell you alot more about engine condition than your mechanic can.

 

[TwinyTwin]

Thanks guys for the help, I will take a look at the plugs tonight. The car is going to seturbo this weekend to get tunned next week and my issues taken care of. Thanks again!

 

[Fuelie600]

Most street chips, like the Red Armstrong 93, will not add fuel beyond a certian point. Period. So to say you can run more boost with any chip is wrong.

Sorry to inform you that your statement is wrong. Reds chips do add fuel beyond the MAFs metering limit. The difference is that fuel is caculated after this point, and not real time. You can run as much boost as octane will allow, and your pump can deliver. You need to add fuel, then slowly creap up in boost untill your O2's are to your liking---then repeat. I've been doing this for years with several different chip burners. I've also known Red and run his chips for years ( back when his black car was still a 109 running 11's ). Brian

 

[Turbo1dr]

Sorry to inform you that your statement is wrong. Reds chips do add fuel beyond the MAFs metering limit. The difference is that fuel is caculated after this point, and not real time. You can run as much boost as octane will allow, and your pump can deliver. You need to add fuel, then slowly creap up in boost untill your O2's are to your liking---then repeat. I've been doing this for years with several different chip burners. I've also known Red and run his chips for years ( back when his black car was still a 109 running 11's ). Brian

True.

 

[turbo2nr]

According to my Direct scan, the 93 does not allow enough fuel for anywhere near 30PSI, you have to get the right chip. You are an idiot to run 30PSI on any street chip. I have all of Red's Chips. I am aware of the do's and don'ts. And this is definitly one of them. Of course a 107, 108 etc, will dump in plenty of fuel when your MAF gets maxed out, but try running a race chip with low boost and you get crazy rich. Same with running high boost and a street chip. If you think otherwise then fine.

 

[pacecarta]

his question was a "little more than his chip was burned" , not 30 psi ,

with a street chip eric sets the timing lower usually 20/18 for 93 octane, if more is desired you could always add in up to 4 degrees . he can start adding more boost provided he watches his O2 and KR and adds fuel accordingly in the chip , in the old days before all these good chips all there was gets some octane in the tank crank up the fuel pressue and crank up the boost and run it rich near 800s. as far as fuel eric provides enough to cover the boost he puts on the chip , to go beyond that he can increase the injector output by 10% in the chip and depending on how big his injectors are he can get from 3pph (with 30# inj) to 5pph (50#inj) more fuel , and with the increased boost signal the regulator will increase fuel supply some by raising the Fuel pressure .

if he cant get the car to run right and have safe O2s through a run at the chips current specified boost he needs to adress that first.

like I said best way is if he calls eric and he will tell him what he can and cant do .

 

[pacecarta]

and since when did DS monitor fuel flow



on my 87 I run egt and wideband and stock O2 sensors are pretty useless
with 770s on my 87 spraying meth AF is 10:1 and egt1530 , plenty of room to lean

on my 86 i run best with O2s 714-720 , a/f shows 11.5 and egt 1570s

780mv is reccommended because unless you know your car well theres a lot of cushion

 

[turbo2nr]

Direct scan shows what the injectors are doing, have you ever seen it? Shows DC and PW.

 

[VadersV6]

You are an idiot to run 30PSI on any street chip. )

If you had the most rudimentary reading skills and attention span, you would see he didnt do it on purpose. Whats the flaming for?

 

[Lee_Burough]

Subscribed

 

[turbo2nr]

Sorry to all. I'm an idiot sometimes. I hope you can figure out why such high boost is not getting you more power.