k24/k20 frank w/ 5 speed - what rpm for vtec?

[DericSh]

bout to start collecting swap parts :mtongue:

curious - what rpm are you guys setting vtec at on k24 frank swaps. revving to about 7k how bad do you drop out of "teh vtak"

thanks
-D

[1GR8EP3]

my vtec was set at 4700 and the rev limit at 7700... what bottom end are you going to go with, k24a1,a2,a4????

[DericSh]

k24a1 i purchased a couple weeks ago

[kon]

I would recommend setting vtec wherever the engine likes it. Its worse setting vtec below its efficiency point (so that you would remain in vtec after shifts) as it would be to set it efficiently and fall out of vtec after shifts.

If that doesn't make any sense, I understand lol. The point I'm trying to get across is that you'd rather have a smooth powerband then having a low vtec engagement point purely for shifting.

[DericSh]

gotcha. well my next question is does anyone wanna share a cal that can get me to a dyno?

[clizoman]

depends how fast you cruise on freeway. i have mine 5k upper boundary, 5k lower boundary

[Slip_Angle]

Your VTEC cross over needs to be set at the point where the low cam stops making more power than the high cam. To know this you need to tune it on a dyno or with theta/raz dyno.

Having said that, I have mine set at 4600 and rev limited at 7500. I can send you my cal but it's tuned for a CAI and RBB manifold. What intake and manifold are you running?

[JP_909]

When I had mine swap it was tuned and set at 3700. Felt good, but its was on a z3 head if it makes a difference.

[Deadphishy]

I've been playing around with mine. Right now it's set for 4k, and i feel that is to low. Although the powerband is smooth it sucks driving around the city because it pops into Vtec right before i shift sometimes. I think 4.5k feels the best on my set up. 11.5/1 compression and TSX head. I found the TSX map to be a great starting point with only a little bit of modding to get the car running smooth. Highway travel was a B!TcH because mine knocked like hell untill i did a lot of tuning.

Edit:

Either way with the Vtec set in the 4-5k mark you won't drop out of Vtec.

[talonXracer]

When the VTEC Xover is properly tuned you should feel absolutely no VTEC bang. You will hear it, but not feel anything but a continuous seamless acceleration, so even if you were to fall out of VTEC when shifting, there would be no impact at all. The K24's prefer a lower xover than the K20 does, due to the longer stroke and rod length.

[Guardian]

Mines at like 4k with 7700rev limit


I could give you my kal but its with 1000cc injectors, tsx kal would be better for you to start with.

[JP_909]

Mines at like 4k with 7700rev limit


I could give you my kal but its with 1000cc injectors, tsx kal would be better for you to start with.


yup use the tsx cal just add 15% fuel all around.

[JP_909]

I've been playing around with mine. Right now it's set for 4k, and i feel that is to low. Although the powerband is smooth it sucks driving around the city because it pops into Vtec right before i shift sometimes. I think 4.5k feels the best on my set up. 11.5/1 compression and TSX head. I found the TSX map to be a great starting point with only a little bit of modding to get the car running smooth. Highway travel was a B!TcH because mine knocked like hell untill i did a lot of tuning.

Edit:

Either way with the Vtec set in the 4-5k mark you won't drop out of Vtec.

Why dont you set up your Vtec for your lower and upper. That way you wont hit Vtec driving around the city?

[Slip_Angle]

My K24a2 calibration.

If you use it, let me know how it works for you.

[DericSh]

thanks, i have CAI but would the type s manifold make that much of a diff?

[Guardian]

thanks, i have CAI but would the type s manifold make that much of a diff?

type-s manifold = same as ep3

[JP_909]

thanks, i have CAI but would the type s manifold make that much of a diff?

Yup,up grade to an rbc.

[FoReVaPmP]

Yup,up grade to an rbc.

:yeahthat: :msmile:

[bchaney]

I've heard the PRB is best unless you have aftermarket cams. You'll end up losing more down low than you gain up high with the RBC.

[civicsibaby04]

When the VTEC Xover is properly tuned you should feel absolutely no VTEC bang. You will hear it, but not feel anything but a continuous seamless acceleration, so even if you were to fall out of VTEC when shifting, there would be no impact at all. The K24's prefer a lower xover than the K20 does, due to the longer stroke and rod length.

so your saying its all right to fall out of vtec when using a 5 speed????

[Slip_Angle]

thanks, i have CAI but would the type s manifold make that much of a diff?

With the Type-S/Stock manifold your giving up lots of torque through-out the power band, especially low to mid range. The top end HP is the same.

DO NOT go with an RBC with a K24 unless it's built up quite a bit. You'll lose more torque and gain only 2-3hp.

The Kal will probably work OK but you'll be rich until the higher RPM's.... Either way, you need to tune it or get it tuned.

[DericSh]

so i need what a tsx manifold?

[bchaney]

I say stick with the PRB.

RBB will be about the same low/mid range (maybe a little more) and restrict the top end. I don't actually have experience with these IMs but this is what I've been told (by Talon). Slip has experience too but I think him and Talon have differing opinions.

From what I understand: PRB = slightly better top end, RBB = slightly better low/mid range. Can't go wrong with either. I'll prob go PRB because I already have one :msmile:

[talonXracer]

so your saying its all right to fall out of vtec when using a 5 speed????


If the tune has been properly done it will not matter.
But for most setup's a WOT run wont fall out of VTEC if the xover is set properly, the stock xover point will drop you out, but most setup's actually thrive on a lower xover point, so it is a easy workaround with Kpro.

[civicsibaby04]

thanks for answer. i was not to sure if i should run the a3 tranny with the k24a2 . so i can save some money cause i dont have to get a 6 speed tranny

[talonXracer]

thanks for answer. i was not to sure if i should run the a3 tranny with the k24a2 . so i can save some money cause i dont have to get a 6 speed tranny

It wouldnt hurt to open the trans up and add a TSX 6th gear to your 5speed. It will help drop the rpm's on the highway.

[civicsibaby04]

It wouldnt hurt to open the trans up and add a TSX 6th gear to your 5speed. It will help drop the rpm's on the highway.

how much would i be looking to spend if i did that just in parts???

[DericSh]

will a type r lsd or 06+ lsd fit in our trans?

[civicsibaby04]

will a type r lsd or 06+ lsd fit in our trans?

yeah it will fit

[bchaney]

how much would i be looking to spend if i did that just in parts???

http://ephatch.com/forum/showthread.php?t=44807

~$450 + shipping.

If you can do it yourself it's def cheaper then a tranny swap.

[Slip_Angle]

I say stick with the PRB.

RBB will be about the same low/mid range (maybe a little more) and restrict the top end. I don't actually have experience with these IMs but this is what I've been told (by Talon). Slip has experience too but I think him and Talon have differing opinions.

From what I understand: PRB = slightly better top end, RBB = slightly better low/mid range. Can't go wrong with either. I'll prob go PRB because I already have one :msmile:

I have tried both. RBB is hands down the winner. Not just a little more torque low-mid but lots more torque. Top ends are the same.

[Deadphishy]

In my tuning 4600 is to high for my vtec cross over. front end of the car lifts up when it hits...

[02CivicSI-VTEC]

With the Type-S/Stock manifold your giving up lots of torque through-out the power band, especially low to mid range. The top end HP is the same.

DO NOT go with an RBC with a K24 unless it's built up quite a bit. You'll lose more torque and gain only 2-3hp.

The Kal will probably work OK but you'll be rich until the higher RPM's.... Either way, you need to tune it or get it tuned.

I TOTALLY agree with you. i feel like the RBC is hurting the My motor. i am thinking of goin back to STOCK PRB IM.