Rev limiter and Cam to crank timing

[mugenprelude86]

hey guys what is the stock rev limiter on the honda a20 series engine ecu? i'm just wondering because sometimes in my racing when we're on a tight track setup i'll bounce it off the limiter in first gear down the straight because it'd be faster than shifting. I know it sounds bad but it would only bounce like 3 times.. i just want to know what this rpm would be?

[mugenprelude86]

also, my car has a major powerband.. there is nothing really until 4500 rpm and then it just SCREAMS right until limiter, it's a good thing it screams yes but i have nothing down low. would this be because my cam belt is off a cog? i have heard of cars running like this with cam belts that are off a bit

[A20A1]

I think it's because of reversion at idle rpms and a little at lower rpms. The reversion act as resistance to the incoming air. or do you have a stock cam?

In that case it could be cam or even ignition timing... this post should be in the technical section.

[mugenprelude86]

well it's in tech now... my car has the stock cam in it,

[A20A1]

oh I moved it... yeah forget that part about reversion.

Have you checked the cam gear with the marks on the flywheel?
Stock A20 rev limit is 6,500 rpm

[mugenprelude86]

i have not checked my cam against marks on my flywheel.. i think i am going to take it to a shop and get it checked out, and btw i have had my tachy over 6500 street driven without the limiter yet.. thats why i am thinking limiter is in the 7000-7500 range because street driven i have never hit limiter, only at the track and i don;t have time to look at the tach. my car dos'nt have an a20 in it either though.. in canada our cars came with an engine called a BT - 1 and then i swapped out the block and head for a european accord 1.8 sohc BT...

[Sabz5150]

I believe the revlimiter is 7000. Justanothermike at Openloop had a vid of his car hammering the revlimiter at 7000.

MP86, you need an aftermarket cam somethin fierce. Openloop all the way :)

Intake: 258* - .420 lift
Exhaust: 270* - .420 lift

[mugenprelude86]

yes... i want the biggest lumpiest cam that i can possibly run with stock springs and whatnot.. to warm it up in the mornings i don;t care if i have to play with the pedal to get it to idle... i'll check out this openloop

[mugenprelude86]

i think i might be going with colt cams because they are so much closer to where i live, not to mention duties and such. and if i wanted to drive to colt cams i could do so in 3 hours

[A20A1]

get the tri-flo if you can.

I got the regular race cam. 4,000 - 7,500
I like it. :D

[Justin86]

Get the Colt. As for the rev limited it is just a realy on the back of the fuse box. It is under the dash and I think it is the lower right one from the drivers view. It should be marked and if not check the repair manual. Just pull it out and see if it makes a difference.

[A20A1]

Oh you mean the fuel cut... I thought he had EFI.

[Justin86]

I though he had carb??? I know that the carb has the fuel cut (revlimiter) and I didn't think the EFI had a type of limiter. :confused:

[A20A1]

look at mugenprelude86 sig pic... in the bottom right it says PGFI... that was my only clue.

[Justin86]

Man you can hardly see it. I have never reved that high to find out but this is the first talk that I have see about a rev limiter on an EFI car. Cause there is other people going 8000 with EFI.

[A20A1]

Well the recent post of the EFI reving to 8,000 actually had an engine swap done.

[Justin86]

Yea there was that one and what he had an Ls/VTEC swap or something or was it just a B18C1. he he he

[mugenprelude86]

like i said i'm not sure what it is bouncing off at when the limiter is kicking in but it sure as hell do it way up in the rpm.

A20: as for the colt race cam, can that be used with my fuel injected engine because he said it is race only carb only... yet i want the highest gains possible, i am not som elittle bitch that is worried about street-ability if it idles really rough on the street so be it, it's the price you pay for hp

[A20A1]

hmm... well I know that openloop had a cam made for the EFI and they weren't able to use it fully because of the rev limiter.

Did Geoff recommend a different race cam for efi? Just tell him your powerband and he should be able to accomodate you.

[Sabz5150]

Originally posted by mugenprelude86
i am not som elittle bitch that is worried about street-ability if it idles really rough on the street so be it, it's the price you pay for hp

Openloop's mild grind idles nicely but produces nice power from 3500 all the way till you bang the revlimiter.



Originally posted by A20A1
hmm... well I know that openloop had a cam made for the EFI and they weren't able to use it fully because of the rev limiter.

MWAHAHAHAHAHAHAHAHAHAHA!!!!!! :smokin:

[cruznz]

if i recall correctly, there's a couple of screws on the back of the dash you remove to disconnect the rev limiter on EFI

[guaynabo89]

rev limiter on efi a20 is 6500. The computer cuts off fuel at that rpm.

The tach is not a perfect instrument so its off a little.

I use to think the rev limiter was like 6750 but I found the specs on the fuel cut in the genuine Honda shop manual.

[cruznz]

....and by removing these contacts , the ECU doesn't receive the signal....but it may bring up a "check engine" light

[mugenprelude86]

ooohh la la.. well dear sir, if you could point myself and the guys at openloop in the direction of these screws it would be greatly appreciated, i e-mailed geoff at colt, and he's like we've got 3 cams, one for fi and 2 for carbed, the full on race cam was for carb only and then the other 2 were the same but one for carb and one not.. then i e-mailed him back asking if the carb one was useable on my engine and whatnot because i want the highest performance possible out of my camshaft if i'm going to buy one. no response and that was over a week ago. I don;t really want to go thru openloop because it is a long fucking ways away, and then coming back over the border with customs and duty and whatever it's bullsht

[mugenprelude86]

where colt cams is like 3 hours drive from my house... it's really no problem to get it done there, but if i'm going to do a cam i want the best i can buy or i'm not going to do one at all, no sense in going halfway on a project because you'll always want to upgrade later

[A20A1]

You should try and get a custom grind.
Intake: 270° duration / .406 lift
Exhaust: 280° duration / .406 lift

Here is mine
Intake: 280° duration / .392 lift / .008 clearance
Exhaust: 288° duration / .394 lift / .010 clearance

I opened up my intake manifold and there was black soot coating the inside of the runners... I think that the reversion might end up fouling the injectors somehow and thats why they don't use it on EFI.

Plus sometimes a flame will shoot out the carb on start up... so it might be more dangerous if that happned with EFI. I dunno.

[89 Accords Rock]

The Carb Version does not have a (rev) limiter. I have the A20A3 Jspec. And ive had mine pinned on the brink of explosion. about 8200 RPM. And i have never had a bounce or any type of fuel cut off. Car sounds like its gonna blow up! but thats the price of speed and performance!

[Sabz5150]

Originally posted by mugenprelude86
ooohh la la.. well dear sir, if you could point myself and the guys at openloop in the direction of these screws it would be greatly appreciated, i e-mailed geoff at colt, and he's like we've got 3 cams, one for fi and 2 for carbed, the full on race cam was for carb only and then the other 2 were the same but one for carb and one not.. then i e-mailed him back asking if the carb one was useable on my engine and whatnot because i want the highest performance possible out of my camshaft if i'm going to buy one. no response and that was over a week ago. I don;t really want to go thru openloop because it is a long fucking ways away, and then coming back over the border with customs and duty and whatever it's bullsht

They'll mail you the cam ya know. ;) I didn't drive to Cali for mine.

[mugenprelude86]

I don;t really want to go thru openloop because it is a long fucking ways away, and then coming back over the border with customs and duty and whatever it's bullsht...

and for all this i mean in the mail... a 235$ cam turns into a 500$ cam in canadian funds

[mugenprelude86]

when the colt cams one will be in the 200's no matter what because he is in canada shipping is baby shit compared to the states , i just need to get a high hp producing cam like openloop makes