Hello all i am asking this because i have a y8 swap in my 95 hatch and when i use a p28 ecu it sputters really bad and kind sounds like popcorn. No joke. But when i use a p05 it runs fine . I am using the dizzy from a d15b7. Do i need a dizzy from a z6??Oh and i don't think the vtec works when i use the p28.???Help plz.

 

Do I need a vtec dizzy for vtec to work?

no and a z6 dizzy won't fit a y8 anyway

 

So what could the problem be. Wne i use the p28 a cel comes on and it runs crappy and when i use a p05 it works fine. ????

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2004es2 &raquo;</TD></TR><TR><TD CLASS="quote">So what could the problem be. Wne i use the p28 a cel comes on and it runs crappy and when i use a p05 it works fine. ????</TD></TR></TABLE>

do the math. figure out what the cel is for

 

Mine does the same thing, but that's because my car doesn't even have a MAP sensor (for SOME crazy reason). It drives fine with a p05, cept white smoke comes out the tail pipe, but with a p28 my car sputters like crazy if i try to keep it at a steady rpm or mph.
And a non vtec dizzy won't bolt on a vtec head. It's slightly different.
check the codes and get back asap gl



Modified by Commiecircusbear at 7:31 AM 4/16/2008

 

check the internal harness of the car as well as the engine harness make sure you have the wiring for vtec..... i know some of the older cars that didnt have vtec engines werent wired for vtec

 

yeah the 92 is the only one that's prewired, all other years you would have to do it yourself

 

I have all my sensors and everything hooked up. The car is a 95 si so it is wired for vtec and if a non vtec dizzy cant bolt up to a vtec head then how is my car running with a dizzy from a d15b7?? Anyways i will chech the cel today and get back.

 

I'm not sure I had a d15b8 head and when I put on the d16z6 head the b8 dizzy didn't fit because the mounts were on slightly different angles. z6 dizzy fit perfectly tho

 

well i think ur car is running with a vtec dizzy. Isnt d15b7 the jdm 1.5vtec motor? or am i wrong?

 

d15b is the jdm, the d15b7 is canadian, and d15b8 is USDM
according to wikipedia

 

First of all, "vtec dizzy" is very misleading. Only the OBD1 VTEC heads are different than all the rest of the heads. But the OBD2 VTEC heads use the same distributor as the OBD2 non VTECs and will in fact bolt up to the 92-95 Non VTEC heads as well.

Now to answer your question. Are you even setting the ignition timing?! When you put the Z6 distributor on the timing will be way off and you wont have enough adjustment to get it to spec.

Did you know that the ignition timing map for a Z6 is absolutely horrible for the Y8? The heads are completely different. The Y8 is a much more efficient head requiring much less timing. By using the Z6 timing map, you are essentially lighting off the mixture so early that peak combustion happens as the piston is still traveling upwards. In effect you are fighting it on the way up. You're making less power than a stock Y8.

 

Get a list of all your bolt-ons and mods and have a new chip made for your p28.

 

Ok but if this is the case i have the ecu that came with the y8 with a jumper harness and it does the same thing as the p28. I am lost.