lbfd48

I just got my custom turbo truck tuned today. The tuner told me if I hit the revlimiter under boost, it will cut fuel and prob blow the motor, is this true? If so how do I prevent this from happen?

SilverSS

iTrader: (30)

I blew my motor hitting the rev limiter or at least that's the only reason I can think of that it blew. Boost was at 16psi with 100% meth still spraying when the fuel cut-off kicked in @7K due breaking traction. Cracked a cylinder. Don't know if hitting the rev limiter was the actual cause but im gonna raise the limiter past 7k in my new motor once it gets tuned.

lurker1978

Complete fuel shut off will not blow the motor, but cut the fuel and still spray meth--yeah that will create a super lean condition and could melt a piston.

lbfd48

This might help its a 99 ls1 317 heads 918 springs 10psi.

daniel6718

iTrader: (36)

it could cause some damage...to prevent it you need an ignition cut not a fuel cut...or put the limitor at like 7500 or so

smokinHawk

iTrader: (48)

i've hit the rev limiter many of time on hard boost, my engine didnt blow.
and it was set about 7200 and duty cycle on my injectors were %110

hellbents10

iTrader: (10)

Like stated above total fuel cut will not hurt it because the power will be gone instantly. If you are spraying a good amount of meth when it cuts the fuel then you will have troubles if it sprays enough to make hp still.

ls1290

iTrader: (20)

I assume you bought a Lotto ticket right after that happened.

'Trust'

iTrader: (24)

That is interesting. How much is "enough to make hp"? Say a single nozzle Alky Control kit for example? 80/20 mix.

MY99TAWS6

iTrader: (3)

Factory turbo cars have rev limiters and they don't blow the motor when you hit them. I have never heard of this before.Fact using a two step is common with turbo cars and it don't hurt anything.

smokinHawk

iTrader: (48)

haha, should have, was running about 85psi of fuel pressure.
ran 135mph at about 3700-3800lbs raceweight. was trying to get to 130mph, over shot it by 5.
those were with some 42lb injectors, got 96's now.

moehorsepower

iTrader: (3)

Now using Nitrous and hitting the factory rev limiter, Thats a whole different story....Just say Ka-Boom!

MY99TAWS6

iTrader: (3)

Nitrous usually you run a window switch so it dont' come on too low and don't spray into the limiter.

moehorsepower

iTrader: (3)

Yup, tell those fools that say they don't need no window switch, believe me I have seen a few...

Drewstein

Should have been running a window switch on the meth.

Another reason I don't run that crap.

NicD

iTrader: (7)

As long as you are not using another fuel adder like a meth kit or anything else that is adding fuel like a wet nitrous kit than no you will not blow your motor by hitting the rev limiter. The factory computer cuts all fuel going in to each cylinder as necessary, not half or anything other amount so it will not run lean.

SilverSS

iTrader: (30)

Good for you! It's just more **** to go wrong. I'm leaving it out with my next build.

stevieturbo

Or just dont hit the rev limiter ?

BigRich954RR

iTrader: (1)

ding ding

Sluggish

iTrader: (10)

2-steps pull the spark out not the fuel.