Removing the rev limiter?

MMamdouh · Post by **MMamdouh** » Tue Dec 21, 2004 9:06 pm

All waht you said is correct guys but let me ask... what are the benefits of going to 7000 or 7500 RPM?? we still have the same torque and HP so we will achive nothing by hitting higher RPM.

anyways the torque and HP tend to decrease at the max stock RPM and they will continue to decreas past the rev limiter so i see no point of that whatsoever.

MMamdouh

KnightWalace · Post by **KnightWalace** » Wed Dec 22, 2004 1:48 am

is it not possible that you may add certain components to change where max torque and max horsepower at 7000+ rpm. Of course after strengthening the engine internals.

-=Exiled=- Chris · Post by **-=Exiled=- Chris** » Wed Dec 22, 2004 2:13 am

the more important thing to realize is for example on the 1.6 the car is rated at 105 hp @ 5800 RPM, in other words once you pass 5800rpm PEAK hp gain the powerband will go back down, however if you wanted to make it peak higher you would need to TUNE it for that, longer intake runners, longer intake, longer exhaust manifolds, etc...

you must remember the goal is to keep the car in its peak rpm area, anymore and anyless will not be optimal, whenever you race and you have modifications you should find out where you peak hp is made, then when you race thats around where you want to keep it in that area

nasser · Post by **nasser** » Thu Dec 23, 2004 5:37 pm

when you hit 7500 rpm and use short gear ratio you will get faster acceleration and higher top speed.

daewooluvr · Post by **daewooluvr** » Thu Dec 23, 2004 6:04 pm

nasser wrote:when you hit 7500 rpm and use short gear ratio you will get faster acceleration and higher top speed.

Is this a fact or just your opinion?

If it's a fact I'd like to see some proof of this on a Daewoo Engine.

MMamdouh · Post by **MMamdouh** » Thu Dec 23, 2004 6:08 pm

short ratio gears and high top speed doesn't go together at all... that's why those things got 6 or even 7 gears to reach a subistantial top speed.

MMamdouh

-=Exiled=- Chris · Post by **-=Exiled=- Chris** » Thu Dec 23, 2004 9:29 pm

yeah gearing is really important, i would thinkg taller gearing would be more important with a higher revving engine, giving her more of a smoother powerband, not just a high peak and drop which a shorter gearing would give i believe.

the goal is efficiency and timing, keep her in the sweet spot

Post by **PrecisionBoost** » Thu Dec 23, 2004 11:56 pm

If you want proof increasing the redline will make your car slower simply look at the Dynojet diagrams from the intake project.

You will see that after 6000Rpm the power drops like a rock.

This is most likely due to restrictions caused by the cylinder head and exhaust system.

To get more power at high rpm (which almost allways comes at the expensive of mid range power) you will need to have the cylinder head totally redone... the ports and valves will need to be enlarged, you will need a multi angle valve job, stiffer and or dual valve springs, lighter valvetrain components, cam shaft profiles.... the list goes on.

So to raise it 1000 RPM your looking at some very serious money.

If your only interest in raising the RPM is to be able to brag about your redline to your buddies I would suggest beating yourself with a large stick until the thought leaves your mind. (preferably before causing brain damage) :P

Torque should be your main concern not RPM.

Lets say we have two guys.....

Guy #1 spends $2000 on upgrading his valvetrain & connecting rods to reach 8000 RPM.

Guy #2 spends $2000 on a turbocharger and keeps everything else stock.

Guy#2 will absolutely destroy Guy #1 in a race..... power/torque is everything.... RPM means nothing without power.

Ok..... here is where this whole "high RPM redline is better" comes from.

If you have a drag racer and you've upgraded absolutely every engine component for maximum power gains then the only thing left that can make you more power is to increase the Redline.

But increasing the Redline is nearly last on the list of "things to do" when your upgrading your engine.... there are far more productive things to sink your money into when it comes to upgrades.

Anyways.... you have my 2 Cents.... take it or leave it.... but I hope you listen to me as your in for trouble if you want higher RPM with a stock engine.