Spark plugs spec

[r34 gtr]

C, if you want to know how my car is going, just look at the thread ive got going.. called "engine clearance problems" or something. stupid thing is being downright gay.

also, thanks for the infor guys, i guess ill be using something like 8's if i plan to kick the crap out of this gt28 when the car is in and running. ill be driving it at probably 12-14psi normally, 20psi when i need it, so should i run 7's at 14 and 8's at 20? i guess it would make sense but is it worth the hassle? will 14psi on a gt28 with ca16 cams, 1.2mm hg, plenty of fuel and a z32 maf run badly with 8's?

- tim

[float_6969]

Run the hottest plug you can w/o detination Tim. I'd run the 7's and then if you are having problems at 20lbs, then switch to the 8's. The only problem I have with going 2 steps colder is that if you try to run them in an everyday sitation, you're going to foul them up quickly.

[cortina-mk1]

Most Australian dynos are way conservative on the figures, so 280whp sounds great.

are you saying 'conservative' as displaying lower figures?

so the 280whp could actually be higher on a USA chassis dyno ?

[paul_s13]

are you saying 'conservative' as displaying lower figures?

so the 280whp could actually be higher on a USA chassis dyno ?

From my research on the net, thats the impression I get, some claim between 10-20% differences!

[r34 gtr]

thats a pretty wicked difference.. in that case it could be a 28-56whp difference! (i can do math! yay!).

oh and ryan, fouling the plugs-wise, mine get fouled up completely within a few weeks anyway (running soooo rich!). after i tune it if i run too cold a plug it will be like the good ol' days. but i will try the 7's to begin with, i wont be able to get on it for 1500 miles or something anyway..

- tim

[paul_s13]

thats a pretty wicked difference.. in that case it could be a 28-56whp difference! (i can do math! yay!).

- tim

From what I read its to do with the old musclecar days when manufacturers wanted higher figures for there big 'ole V8's and thats why I have trouble with some of the figures quoted.

I heard of a car with a stock T28 that was supposed to have 350bhp@ the fly (about 300-ish RWHP) and this engine had some seroius work done on it, but when it went to a dyno day it got 309 flywheel bhp, and despite my car only scoring 296bhp I had a higher RWHP figure that that one (got about 267@ the wheels) I won the day!

http://www.sxoc.com/site/events/sca1/index.php my old car is in a few of the pics

[cortina-mk1]

I heard of a car with a stock T28 that was supposed to have 350bhp@ the fly (about 300-ish RWHP) and this engine had some seroius work done on it, but when it went to a dyno day it got 309 flywheel bhp, and despite my car only scoring 296bhp I had a higher RWHP figure that that one (got about 267@ the wheels) I won the day!

this confuses me even further... so your car had a higher rear wheel figure? than the other? is that what you meant?

well this is a diffinant reason why not to use estimate flywheel figures ..coz in this case they were way out.

and what sorted it out was the real test what horsepower it had at the wheels...yours had more

forget this flywheel estimated stuff ....

[RMiller]

cuzan0 made 277 to the wheels with a t28, stock manifold. He just added hks 256 cams, stainless manifold and maybe something else. That figure was at 1.2 bar. On the same dyno same day an sr20det made like 169 whp.

[nismoplsr]

I found that interesting that American Dynos read higher than an australian one. Especially because they dyno that was used to tune my car last was a DaynaPack which is made in New Zealand.

something to think about

[paul_s13]

Cortina,

I has lower measured transmission losses that the other car I had 29bhp losses and he had over 40bhp losses.

Nismoplsr,

It all depends on the calibration file used, as far as I know all U.S. dyno's use the SAE calibration.

[float_6969]

...oh and ryan, fouling the plugs-wise, mine get fouled up completely within a few weeks anyway (running soooo rich!). after i tune it if i run too cold a plug it will be like the good ol' days. but i will try the 7's to begin with, i wont be able to get on it for 1500 miles or something anyway..

- tim

Why do you say that? If you are making reference to an easy break in on your new motor DON'T!!! I can explain it if you like, but if you look HERE it does a much better job....

[undertaker]

I found that interesting that American Dynos read higher than an australian one. Especially because they dyno that was used to tune my car last was a DaynaPack which is made in New Zealand.

something to think about

Dynapacks can be very consistent especially as there is no tyre/roller interface but like paul said the operator can introduce variables.paul_S13: what do you mean by measured transmission losses, do they check for a gearbox temperature increase or something?