alex14

I have just chipped my ecu and raised the rev limiter planning on revving it to about 8000. my issue is that when I hit about 7000, the car just looses all power. the guy that burned the chip for me, gave me the explanation that "Just because the rev limiter is higher, doesnt mean its going to make power up there"

I do understand that, but the power shouldnt just fall off like it does. the car with out a doubt slows down in those rpms, and doesnt even maintain the current speed.

I am thinking its because he didnt extend the fuel/timing maps to go up that high, he simply left the stock P28 map, and just raised the limiter.

How can I solve this problem? I have a VFAC hooked up as well if that makes any difference. Do i need to add more fuel up top? less?

Thanks for the help guys.

grumblemarc

iTrader: (4)

Get a real tune. All he did was put a basemap on it. Get rid of the VAFC. I don't know why people still run those archaic devices.

And you should listen to the guy that did the basemap. He's knows what he is talking about.

alex14

So how can I fix this problem? take it to a local tuner?

also, does anyone have a picture of the base map for a p28 they could post for me to look at?

grumblemarc

iTrader: (4)

Who put the basemap on it? Does he not do street tunes at least? He raised the rev limiter because you asked him to.

alex14

A guy online. not someone local.

grumblemarc

iTrader: (4)

Then start looking for a tuner locally. That's your only option unless you want to risk tuning it yourself, if you have the means to that is.

Wrona

so you raised the rev limiter on a stock Z6 why? im looking forward to ur thread about what swap should i get cause my motor blew good job

ozh_hawaiian

making power between 7 and 8k in a 120ish hp 4 cylinder civic? what kinda of power do you expect in that range? you are asking to blow up your motor...

grumblemarc

iTrader: (4)

I'm guessing the OP thought that if 7k was good then 8k would be better. if you're thinking of tuning it yourself go here first.
http://forum.pgmfi.org/

apexi_rsx

def do not rev a d series to 8k unless u have a cam and this car is not daily driven to 8k a lot. an n/a d series rev'd to 8k is overkill especially on a stock cam. Honda would have reved higher if they thought it could bring more power reliably but they didn't and the reason u should not go over 7200-7500rpms

alex14

Car is not daily driven. Its a slow *** race car. I do a lot of 8th mile drag and I am trying to get the car to stay in 2nd gear untill the end of the track. about 150ft. short of the finish, I am shifting into 3rd and by the time i get it in gear there isnt enough track/power to use 3rd. i think that being in 2nd at 7500-8000 would be quicker than shifting into 3rd and being at 4500.

I drove it to an Autox over the weekend and I drove 90 miles there. I burned a quart of 20w-50. the motor is already in terrible shape and i could care less if it blows up.

strategy400

Try some valve springs maybe they're floating and hopefully not still in the way when your pistons swing around...

You should try to make better power within your engine's specified redline unless you change internals to accomodate the higher revs. (lighten valve train, better springs, strengthen bottom end).

I've heard of good results with a jackson supercharger on these engines with stock internals. Would probably be an easier mod than the above mentioned mods at a similar pricetag. Although the low end torque would probably be better on a street car. I'd much rather have low end as this is where these cars really suffer.

apexi_rsx

if u want to not run out of gear why not run a dx transmission not a short ex transmission? then u wont be running out of gear and wont have to raise the rev limiter to do so. it does sound like the motor is in horrible shape. 1st gear in both transmissions is the same the rest of the gears tend to get longer then the ex transmission from there.i had a boost stock z6 myself and the power was good until it hit about 6k on it seems like it started to die off or remain level in power maybe a slight gain but u could hardly feel it.

ktsciv93

intake port size, camshaft.. just to name a couple reasons why u probly won't make power stock passed 7k...

also there's a map for stock d16z6 on Chrome.

alex14

The car is an 88 ef sedan, cable trans. I figured i would get more help about the computer/motor in the EG forum than the EF. I am thinking bigger tires might help also, maybe go from the 60 sidewall I have now to a 65-70 if I can find my old tires.

The motor is in terrible shape, I am keeping it in untill I have money for my buddy's B20.

grumblemarc

iTrader: (4)

If it's in terrible shape then why even bother?

alex14

Why would I not bother? it gives me a good excuse to get that b20 early. lol

looking at the fuel maps for a p28, at 6500-7000, the fuel charts just flatten out. I think that is my problem.

grumblemarc

iTrader: (4)

Well that definitely is PART ofyour problem.
You should go to this forum.
http://forum.pgmfi.org/

alex14

i've been searching for similar topics there, and havnt found anything. Time to start a new thread for them to look at I guess.

ktsciv93

yeah ur a little lean up top there.

but honestly, you're not going to make much/if any more power at 8k then u will at 7k with a basically stock motor, so i wouldn't throw much money into someone changing ur fuel map a little bit just so u can rev to 8k

but to each their own..