Power Output

[Mr Camouflage]

Originally posted by Deus Ex

Well i had it tuned and put it on the dyno..115kw at the wheels, about 161rw Hp i think. Not bad, i had hoped for abit more, i didnt get to see the torque curve but im sure that would have been huge.

So basically im now looking for some easy mods for easy power, putting trumpets on my triple webbers will be the first, then i was thinking of re-grounding my cam to make it alittle mild.

Anyone have any other suggestions?

Not easy but,

Take the p90 off and put a e88 on it (or N42). That will bring the compression up, increasing horsepower. The p90 has larger cc chambers (It has a 53cc chamber) than the e88 because its for a turbo engine, and along with the dished pistons lowers the static compression ratio down for the turbo.

The p90 is supposed to flow better, but the e88 will have higher compression. Putting it on a flattop L28 motor puts compression in the mid 10's.

[Deus Ex]

OK

Its seems i have made som etypos () over the course of this post. The details are as follows (thanks for jumping in doug. No doung im not putting an RB in);

P90 head

Triple 45mm Webbers

MSD ignition

Aparently it has a ground cam but im not sure

Bored to 2.9L

200B flat top pistons

Nothing has been shaved or ported as far as i know. I have no idea about the diameter of the pistons or the length of the rods as all this was done before i bought it and i havnt pulled it apart (gotten doug to pull it apart rather) to look at it.

I was wondering about the head, being a higher flowing head for a turbo i assumed that it would run a lower compression, but after we pressure tested the cylenders we got an average of 175 Psi. I believe that is relativley high, so if i replaced the head and maybe made the cam mild (again not sure HOW ground it is) that should add more ponies.

With my setup i believe i should be getting more power, but i have no idea where the bottle neck could be.

[Brett240]

I don't know the specifics, I just take the tacho into a gauge workshop & tell them to modify it to suit the square wave output of the MSD rpm signal.

fair enough then,

i have to say im somewhat concerned about the original tacho wirings ability to handle the 460 odd volts that the MSD puts out.

Deus ex,

i wouldnt be switching anything until you know exactly what combo you have there, who knows what your compression is now, let alone what it will be if you switch heads

[Ben]

The MSD 6A series have a male spade connector on the end that is the tacho ouput signal connector. It's a high impedance, low voltage/current square-wave output. There's more infor in the user manual (which is available at http://www.msdignition.com/)

DO NOT hook up the tacho to anything that even looks like it connects to the coil!

[Brett240]

well now it makes sence! I dont have a manual ill have to download it,

Thanks Ben

[Deus Ex]

hey guys,

Well its been a while on this thread but i do have more to report, after blowing a head gasket and doing the work (Doug Ray and Jake my personal mechinics. you are a life saver) I have found that my head is indeed ported and polished. I also found that the engine has been balanced and the crank has been liniged. (what ever that is )

We gave this a good clean out and advanced the cam gear to 3. It now pulls alot LOT harder. but i wont know an output till i need to get my carbs tuned again. My compression appears to be around 8.75-9:1, which is alittle higher than standard. I guess the flat top pistons are somwhat negated by the expansive P90 chamber. I was intending to put an N42 onto it, but it needed somework, and my head has aleady been flowed, ported and the intakes mactched.

ANyhow, i have noticed a significant increase in power, and am very interested to see what it will dyno next. I guess my next step from here is a cam or EFI system (read up on the stroker, the commitment is too large at this stage) and im out of space.

But as you guys well know, they are a work in progress.

[Tommo560]

hey guys,

maybe you have seen one of my posts but i am new to this forum. i have just bought a competition spec 260z. getting it dyno tuned soon, will be interesting to see what power it has as it has... high cams, triple 45mm webers, flat top pistons, ported polished and blueprinted l28 (2.8l) with 2.6 head (10.4 compression???) high intensity(???) spark. this thing is a fuel guzler, it doesnt like to rev less than 2500 because of the cams and the 4.4 rear diff. according to my dad (who has beendriving it) it chews through about as much fuel atm (its a bit rich down low cause its made to rev high being a comp motor) as he gets through in his '93 3l tt toyota supra. its basically set the odometer to zero, and re-fill at 150 miles, ~250k's, (when racing) to make sure you dont run out of fuel cause the gauge doesnt work.

Tom.

[Fun_in_my_z]

Welcome to the club Tom, I bet that car is a wild ride to.

How does it run in traffic? I keep hereing that race engines run hot at low speed. Do you have this problem?

[Murph]

Sounds quite interesting Tommo! Let us know how it goes when you get it on the dyno and/or the track.

For a comparison on fuel, my zed (basically a stock L26 with 240Z SUs) will do about 250km on 30L of fuel at best. That's driving on the street. Makes 250km from a full tank on the race track seem pretty good.

P.S. You have any photos of the car?

[Tommo560]

It runs quite well in traffic but it really fuels up if you idle it for more than about 20-30 seconds. besides the hard to get in and out of racing seat and rough idle it is a very nice car to drive. with the overheating isuue it has a thermo fan so i dont know if that helps but it should.

some pics of me getting driving instruction at barbagallo raceway, perth, australia.

http://www.tamiyanitro.com/bbs/topic.asp?TOPIC_ID=4653

Tom.

[Mr Camouflage]

hey guys,

maybe you have seen one of my posts but i am new to this forum. i have just bought a competition spec 260z.

Tom.

Welcome Tommo,

This is a great Forum for Z's, Quite a Few Perth Guys here too. There's an unofficial Z club in Perth, and Z day is coming up soon (26 of september), you should get along, and bring your Z if you can. www.wazcars.com

Theres also a lot of perth guys on the OZ Dat Forums: www.ozdat.com/forum/ ( go to events -> Perth Datsun Events ) They have organised a cruise for this weekend.

[Fun_in_my_z]

Nice to know there is a fello 16 year old z owner out there.

Wish mine looked as good as urs does tho.

It looks like you had a blast.

Just remmember no tickets!