dragonsmp

I have a bone stock GSR motor w/ a Drag T3/T04b. I am currently running stock injectors, 12:1 FMU, Bosch Fuel Pump, missing link, V-AFC, and AVC-R. Lately I have been bosting about 10 psi and an occasional 12 psi. The other night I was running 14 psi at the street races, no detonation what so ever.

My question is:
<ul>[*]With my current setup, what type of boost levels should I be running?[*]Can stock GSR's run 14 psi safely?[/list]Keep in mind I have yet to dyno the car, therefore no fuel tuning is present.


[Modified by dragonsmp, 10:22 AM 9/18/2001]

IgniteTeg

Wow you can boost around 10-12psi or so with stock injectors with the 12:1 FMU no tunin whatsoever damn how you manage it? I Heard people say at 7psi is max with stock gsr internals. Did you change pistons and rods etc?? You said bone stock gsr so maybe you didn't. What are your setups? I'm very interested to see how you manage to boost so high without changin the internals and the injectors. Is your VAFC tune? Or you just set it by yourself? I'm surprise you haven't shoot a rod through the block? With the High compression pistons. I would like to know how you manage all of this under high boost on stock gsr internals. Thanks for your help.

VaporTrail

you may not be able to hear the detonation over all the other noise present. 14psi with stock injectors is a blown motor waiting to happen.

RGAZ

I am impressed. 12 psi on stock internals, 12:1 FMU (that'd be over 140psi fuel rail pressure!! if the pump could keep up) that is incredible. Are you pulling back the timing something serious or what? maybe running 110 octane? Are you sure about those boost numbers?? Stock injectors!! Doh!

That's pretty scary!

Randy

dustin

Yeah do you have a J&S Safeguard? detonation at full throttle is like impossible to hear.

Most people that use stock injectors + FMU at 10psi+ blow their motors within a matter of weeks.

Dustin

Jared

You guys would be surprised about what will blow a motor, listen to this setup my friend has in his drag car:

B18C1 in '92 hatch
rollcage, m/t slicks on bogarts
T3/T04E & custom piping, spearco fmic
9:1 SRP pistons, stock rods
12:1 FMU
stock injectors
120psi fuel pump
15psi sometimes more

I keep telling him he's asking for trouble with that much pressure behind a stock injector, but he wont listen. But who am I to argue, my car is on jackstands in my driveway, and he is running 7.29 in the 1/8 mile consistently.

liam821

I am running 14psi on a stock d16z6 with a erl mf2 fuel computer, stock honda injectors, 55psi fuel pressure, and a walbro fuel pump.

Runs perfect.

Its all about tuning.

The GSR is a super strong engine..it will hold 14psi without a problem of boost as long as it tuned correctly. There is people out there running 10's with mostly stock GSR blocks (just new pistons).

liam

VTC_CiViC

Truth be told, witht he proper fuel/ignition management (and this is SOOOO vital), you'd be amazed what a "stock" bottom end can actually hold. But remember, the harder you push the stock bottom, the easier it get's to screw up, and the smaler the margin of error get's. One small glitch in the fuel.. ::

DIRep972

iTrader: (1)

i think u have a freak motor..

anyone wanna take bets on how long it takes him to blow his motor? @14psi id bet 20 bucks it takes less then 10 runs..

not sure

LsTurbo91

i'll take 9

liam821

haha..i will let ya all know. But so far..no problems. You wouild be surprised what a stock honda motor can handle.

As VTC_CiViC says, its all about tuning. A stock motor can take alot of boost as long as the fuel is correct. But it does lower the margin for error.

My last engine i was boosting 15-18psi..without any problems...on 91 octane pump gas. Ran sooo awesome! SOOOO fast. But one run i blew a vacuum line to my fuel computer, which in turn stopped adding fuel. The motor detinated really bad and i broke holes in the top of my forged JE 9:1 pistons....

Look right above where the valves holes are on the piston...see how there is two big pieces missing and you can see the piston rings? (hint hint thats *not* good)



But a stock motor can handle lots of boost..just make sure its running correctly. Its all about tuning.

And i will let ya know about the 14psi and how long it lasts..of course..if i blow it up..i will post something about it.

fyi my current 14psi motor has 140,000 miles and still counting.

liam

SIK IN DA HED

hmmm thats interesting...

DIRep972

iTrader: (1)

exactly, with tuning, this guy has no tuning.. otherwise id bet 14psi could last awhile if it was tuned PERFECT..

dragonsmp

Damn... I guess . Maybe I will just take this as luck and turn down the boost before I kiss like $4,000 down the toliet. Too answer everyone's question, there has been no fuel tuning done. V-AFC is set to the default parameters.

Are you pulling back the timing something serious or what? maybe running 110 octane? Are you sure about those boost numbers?? Stock injectors!!

Timing is stock... and I am only running 92 octane. I am positive about the boost numbers. I hit a peak boost level of .97 ~ bar the other night.

I'll keep it down to 10 psi. max fella's. Thanks, for all of the replies.


[Modified by dragonsmp, 1:51 PM 9/19/2001]

Blown90hatcH

Hey Jared....are you sure that you are not thinking of my car on the jack stands? That is funny

dustin

Honestly though, anything beyond 8psi w/ stock injectors and an FMU is just gonna blow the motor.

Dustin

Kamin

ok im an idiot i know, but can someone define detonation?
and i give him no more than 20 runs at 14 psi lol, even with tuning i wouldnt run a stock motor above 9 at the most espically with stock fuel system.


[Modified by KAMiN, 5:53 AM 9/20/2001]

dustin

Stock pistons, rods, and sleeves can probably handle 14psi OK for quite a while with no detonation. His fuel system definately cannot, though.

Dustin

IgniteTeg

geezes he is very lucky i guess. I wouldn't push it too far.

liam821

With a FMU i dont think its a good idea to run much over 8 or 9psi also. The fuel pressure just gets too high. Using a AIC works pretty good...i have run 18psi with one without a problem.

liam

liam821

detonation sounds like pinging or little explosions (which is what it is). Sometimes you can feel the car hesitate or jerk at high rpm because of it.

And my engine will hold more then 20 runs at 14psi...you will see!

liam

dragonsmp

What's an AIC? Do you need to upgrade from stock injectors when running an AIC?

Rob03Pro5

AIC's or EIC's are Additional Injector Ccontrollers. You leave your stock injectors alone. The AIC and EIC controll extra injectors that are 1.) mounted in front of a TB (2 extra injector example) or 2.) are mounted in each intake runner (4 extra injector example). These things are my favorite fuel solutions for the po' man. FMU's are way too dangerous with those high fuel pressures.

dragonsmp

Would it be safer to run big *** injectors like 450's or 550's and like a 4:1 or 6:1 FMU. What do you guys recommend is the safest injector/FMU combo to run 10 - 12 psi?

If I were to go with a DFI... would it be ok to run 12 - 14 psi.

jinxproof99

run 440's with a afc and 12:1 fmu. thats what i run. at 9:1 compression and pistons, with what i've listed, you will have no problems running 14 lbs on pump gas. with stock pistons/compression, run a inline pro headgasket instead and still run 12 lbs on pump gas. just tune it correctly. you can run 20+ lbs on race gas. i run the headgasket and have had NO problems.


[Modified by jinxproof99, 4:58 PM 9/20/2001]