Malgerus

Hello everyone in the EG forum!

I was wondering what the stock redline is for a stock, D16Y8... I'm running a 92-95 p28 ecu, so what's the rev limiter on that computer? How high should I rev this motor with this computer? Is the Y8 reliable at high rpm? No one anywhere else seems to want to tell me, and I'm getting the runaround. I'm running it in a CRX, in case you're curious.

I figure if anyone knew the answer to my question, it would be you guys in this forum. TIA

ITRacer121

hey put it in first,cruise down the street until you hit the rev limiter. when it cuts out, thats where it is.

Moosilla

I am about 90% sure the stock P28 rev limit kicks in at 7200 RPM

Cheers

Mugen(HCA)

Stock Rev limit for that ECU is 7500 rpm according to my VAFC

Your idle issues might be due to the fact that there is a difference in the cam timing between the two, I know ZEX produces a different cam for both the Z6 and Y8 due to the fact that there is like a 10 degree difference at the point where the cam connects to the distributor.

.hugo

the rev limit on my tach says 7200, but i've gone a bit past it (dunno why, it stops making power at ~6600), so i guess the ecu cutts off at 7500.

RR98DX

thats funny cause the D16Z6 is rated at 125 @ 6600...so right there it should be pulling its hardest...

Grimm

the d16y8 with the ecu of a stock 96 ex cuts out at 7200 maybe a bit earlier. I've done it plenty of times. As far as reliability seems strong to me

eg6ajk

stock revlimit is at 7200rpm (cluster will usually show 7400rpm), fuel cut off for the ecu is at about 7400-7500rpm

the d16y8 will definatly handle 7500rpm, but pointless to rev past 7200rpm

JZ_4_CRZN

What if you chip the ECU...what would be the limit there...and is it aight to push it with out having anyother work done to the motor.

ITR1071

7100-7200rpms

Quetzolcotl

i've got a generic chip in my ecu for my z6. 9000 rmp rev limit. i've had it up to 8k quite a few times and its all good. and its all stock internals. i can get up to 60-65 mph in second gear.

Mugen(HCA)

My Z6 with some bolt ons does max power at 6900 rpm (dyno tested), it is best to rev it that high in first so that you do not fall off vtec range in 2nd gear.....I think around 7300 rpm is a good shift point.....

Anyway, my car also gets to 62mph with the stock rev limit

127.0.0.1

Tiny engine + mad head work + large exhaust tip + even larger wheels + ME = Ill smoke ya

(hehe)

HarryB

Malgerus

Heh heh you probably will, mate But on the big exhaust tip, because sleepers rule Anyhoo, so the general consensus is that I should shift at 7200 rpm when I'm racing, and the rev limiter is 7500 on the p28? The reason I would shift at 7200 is to keep the motor in it's peak powerband longer. As for the idle, it seems to be getting better, but we'll see.

stkd16z6

i run a y8 motor in my 94 EJ with the stock p28, it fuel cuts at 7200. the y8 runs much better than my old z6. the y8 does have a better cam than the z6, so it might be better to shift higher like 7400 or 7500


[Modified by stkd16z6, 4:04 AM 6/18/2002]

Malgerus

ok, but if the fuel cut is at 7200, how can I shift at 7400-7500 rpm??? I think I'll shift at 7100

stkd16z6

get your p28 rechipped. i've been told that the prospeed chip is a really good program. look in the classifieds for hyperduck tunning (adrian) he rechips ecu and offers a socket chip that can allow you to change programs such as skunk2, feels, jun, etc. all of these programs have a higher rev limit than stock.

.hugo

actually thats what i meant, that its pointless to shift at 7200, since it starts losing power after 6600, guess i should've been more clear

Moosilla

Shifting at higher than red-line has some advantages in certain gears, EVEN if the cam's power-band is falling off. When you shift gear the revs drop, often out of VTEC, so by holding your rev's longer you can keep you car in VTEC all the time (even after shifting) ..which is vital on the track. Yes you are not making power at the higher rev' s BUT you do not drop out of VTEC ....


Chipping your ECU is a good low cost option to add some power and remove or raise the rev-limit and or speed-limiter.

Each program has quite different fuel/timing maps vtec activation points, and rev limit.
Each of the chips different configurations will yield different results with different mods. The only way to know for sure what program will give the best results with your setup is to try different chips (programs) and do some runs on the dyno.

I have done 30+ Dyno Pulls with 8+ chips after different mods have been performed. Each time I changed or add a modification the Chip that yielded the best power has changed ... I have gone from Prospeed to J's to Gude (current chip).

If you decide to go the Chipping route, order a couple extra chips and then try them out to see which works best for you.

FYI, changing programs on a CHIPPED ECU is as simple as removing the ECU, removing the top cover and changing the chip with another one.

Adrian has chipped my ECU's and has provided all my programs(chips). He provides excelent service at a great price. I highly recommend him.

His web page is listed below ..you can find his contact info on it.

www.hyperducktuning.com


Cheers

Moosilla



[Modified by Moosilla, 11:19 AM 6/18/2002]

Malgerus

Well, thanks for the all the input guys! As for the ecu, I probably will chip it someday when I can raise the cash (Im a broke ***). So right now I assume that I should shift at 7200 correct? I believe that the 92-95 Si's tachometer says 7200 rpm is the redline, so the limiter must be a little above that. I hope. Thanks!

Mista Bone

shift at 7200 on a stcok tach which is about 6800 REAL rpms. Stock limiter is at 7200 rpm, but the stock tach will read 7600-7700 rpm.

Quetzolcotl

is that right? maybe each car is different. my vtec used to kick in at 5500 rmp just like its supposed to and that would read right on the tach. does it only get off in higher rpm?

RedlineUBRF

My Si reads the same numbers...
At what point does vtec disengage for the D16z?

Malgerus

Hmmm. is the stock tach that innacurate??