premium fuel

[jcrules99]

i was wondering if anyone would know if premium fuel would be needed for a 2000 prelude?

[QuasarCav]

What does your owners manual say?

[b_t]

It would say on your gas door or gas cap if you needed premium gas, but your car would run just as well on premium or regular gas since the ECU can compensate for it.

[jcrules99]

Originally posted by QuasarCav
What does your owners manual say?

there was no manual with the car


Originally posted by b_t
It would say on your gas door or gas cap if you needed premium gas, but your car would run just as well on premium or regular gas since the ECU can compensate for it.

alright cool, thanks for the info :thumbsup: :D

[Audio_Rookie]

As long as the knock sensor is working :D .....cost me a motor once.

In anycase I highly doubt that car would require anything above 87 octane.

[rc2002]

Yes that car needs premium fuel.

[romanianmagic10]

i got an h22a is it bad to put 92 gas in?

[liquidboi69]

Any VTEC engines that have a redline over 7000 rpm NEEDS premium fuel. No premium = messed up engine timing = less milage/performance. Not just VTEC, but any car with variable valve timing with redline over 7000rpm (and turbo'd cars).

[5hift]

It says right on the inside of my gas door only to put in premium fuel. But then again, what do those Honda guys know? :rolleyes:

[JspecB16]

It all has to do with compression. The redline has little to no effect on the fuel requirments, a high compression ratio is what requires the high octane fuel. I have a Jspec SIR and it needs premiem, so i have to assume the ludes do too

[Speed_69]

yup any DOHC VTEC engine needs premium fuel :thumbsup:

[HRD2PLZ]

Dealership told my regular is fine in my TL, despite what the owner's manual and gas cap say :dunno:

[yellowsnow]

^^ don't trust the dealers, probably won't do anything right now if you use regular gas, but 5-10 years down the road, you'll notice big problems, less mileage, etc.

[k98303]

5TH PRELUDE NEEDS PREMIUM!!!! it says in my 99 prelude manual =)

[afrotl]

Originally posted by HRD2PLZ
Dealership told my regular is fine in my TL, despite what the owner's manual and gas cap say :dunno:

hmmm so have you been using premuim or regular?

[b_t]

My mom's taurus wagon only needs regular gas to make more power. It does not need premium, it is only a suggestion.

[HRD2PLZ]

Originally posted by afrotl


hmmm so have you been using premuim or regular?

Regular. I run premium through about once every 4 fills... so about once every 3 weeks :dunno:

What about you, what do you run in the TL?

[kane584]

Originally posted by k98303
5TH PRELUDE NEEDS PREMIUM!!!! it says in my 99 prelude manual =)

:werd:

[afrotl]

Originally posted by HRD2PLZ


Regular. I run premium through about once every 4 fills... so about once every 3 weeks :dunno:

What about you, what do you run in the TL?


premium since the day I bought it.

[GTS Jeff]

Originally posted by liquidboi69
Any VTEC engines that have a redline over 7000 rpm NEEDS premium fuel. No premium = messed up engine timing = less milage/performance. Not just VTEC, but any car with variable valve timing with redline over 7000rpm (and turbo'd cars). Care to explain how variable valve timing and high revs influence the need for higher octane?

[liquidboi69]

Because if you don't use premium on Variable Valve Timing, the ECU will retard the ignition timing so the lower octane doesn't combust at an unwanted time. Therefore your ignition timing will change/be messed up. VVT and VTEC engines need Premium because at high RPMS, you don't want uncontrolled combustion/dentonation.

Also, variable valve timing goes hand in hand with high revs, as most VTEC and VVT engines have high revs (which is only made possibile by variable valve timing, and lift bolts.)

But even if you don't have VTEC or VVT, yes high compression ratio will warrant a need for high octane.

It's just a pattern that all VTEC and VVT engines need premium because they all have Variable Valve Timing with Lift Bolts which enable those high rpms, and they also all have at least a 10.5:1 compression. Mine has 11.5:1.

Turbo also needs it because you don't want uncontrolled deontonation/knock due to heat...even tho most turbo built motors are around 9:1 or 9.5:1.

[b_t]

Last I checked I could take a small block Chevy with pushrods and no VTEC, build it, and spin it to 9000rpm. And Toyota's Group A racing motor has the VVT removed and spins to 12,000rpm.

VTEC is not a requirement for high RPM, high RPM is a requirement for a tiny motor to make decent power and VTEC is a compromise for emissions and torque.

Other then that you are mostly right. Please do not continue to attempt to describe the requirement of high octane in a boosted application.

[CrvenaZvezda]

all DOCH VTEC engines need premium fuel!!!

[Xtrema]

Do what the manual recommends. Staight and simple.

If car's manual recommends premium, it means engine's full potential is reached with premium. You can use regular but don't expect the performance as advertised.

If car's manual recommends regular, putting premium in it won't do it any better (other than the slightly extra cleaning additives).

If you can't afford the gas, don't buy the car or get a different one.

[HiSpec]

so even the new Fit with VTEC requires premium?? I doubt Honda would promote an economy vehicle yet requires expensive high octane gas.

[moe007]

cant u use normal fuel?

[barbarian]

Originally posted by b_t
My mom's taurus wagon only needs regular gas to make more power. It does not need premium, it is only a suggestion.

There is a Ford TSB recommending using regular unless your manual requires Premium due to ECU adjusting problems.

[k98303]

i used premium on my lude. even though it is god damn expensive............................:banghead:

[Audio_Rookie]

Seems to be some people are just throwing premium into there cars to make it a high performance unit. In most of these cases the fuel has about the same effect as adding a fancy decal.

Yes octane of fuel required does deal with compression ratio and ignition timing.

My owners manual says If I ever run more boost on the stock turbo than its rated for, it will break immediately and destroy the engine. Seems to work fine at 17psi (7 above the rated).

My mothers owners manual for her saturn says she isnt supposed to run less than 89 octane fuel....has been running 87 for 4 years now... runs great...53mpg.

True the knock sensor will pull timing if there is knock due to fuel being too low of octane, but will this decrease your mileage by 20%? because the gas is about 20% more.

Is there actually knock when running lower octane? How many people do you think nevery looked at the owners manual and run 87 octane...I would guess 90% of people. Many of them never have problems.


I ran the fricken piss out of my 89 shelby daytona with 15lb of boost and a small ass intercooler with 87 octane. After I blew up my motor for the new daytona (17 psi boost spike on 87 octane) I put that motor in my car and no problems, still 140 compression all across the board. Yet the manual says to use minimum 91 octane.

[USHER]

my moms corrola has vvt but doesnt require premium so it cant be true in all cases.

just do what the manual says. and yes your prelude does require premium

[A2VR6]

Originally posted by HiSpec
so even the new Fit with VTEC requires premium?? I doubt Honda would promote an economy vehicle yet requires expensive high octane gas.

No, it all depends on the Compression Ratio of the engine and not if it has VTEC or not. The Fit does not require premium because it only has a compression ratio of 10:4:1. Same goes for the base Corolla with VVT -i it only has a compression ratio of 10:0:1. If you look at a K20 outta a Civic Si or the F20A they all require premium fuel and have a compression ratio in the 11's (11:7:1 and 11:01).

[Dren]

get any better fuel economy on a fit..with premium?

[MudCrawler]

Originally posted by Dren
get any better fuel economy on a Honda Fit..with premium?

You wouldnt. It would most likely result in worse fuel economy. My 06 civic gets worse fuel economy on premium. Higher octane fuel is harder to detonate, and thats why it is required in high compression situations, NOT in cases such as my civic, and the honda fit.

[GTS Jeff]

Originally posted by liquidboi69
Because if you don't use premium on Variable Valve Timing, the ECU will retard the ignition timing so the lower octane doesn't combust at an unwanted time. Therefore your ignition timing will change/be messed up. VVT and VTEC engines need Premium because at high RPMS, you don't want uncontrolled combustion/dentonation.

Also, variable valve timing goes hand in hand with high revs, as most VTEC and VVT engines have high revs (which is only made possibile by variable valve timing, and lift bolts.)

But even if you don't have VTEC or VVT, yes high compression ratio will warrant a need for high octane.

It's just a pattern that all VTEC and VVT engines need premium because they all have Variable Valve Timing with Lift Bolts which enable those high rpms, and they also all have at least a 10.5:1 compression. Mine has 11.5:1. I just made you look stupid by forcing you to post all that junk. ;)

[adam c]

so am i right to assume my '01 gsr requires premium?

[Speed_69]

Originally posted by HiSpec
so even the new Fit with VTEC requires premium?? I doubt Honda would promote an economy vehicle yet requires expensive high octane gas.
all DOHC VTEC engines require premium, SOHC VTEC engines just need regular gas

[Speed_69]

Originally posted by adam c
so am i right to assume my '01 gsr requires premium?
right :thumbsup:

[HiSpec]

so i'm guessing here the Fit is SOHC?

[Gen4Accord]

i have an f series therefore low compression i still use premium how much is at a fill really like 5 dollars

[Howl]

Not all dohc vtec's need premium fuel!!!!!