Tips For Dyno Runs.

[SECURITY]

im about to put my car on the dyno. right now my spark plugs are gapped at .8, but i fixed my coils (sanded the inside of them) over 2 months ago and havent gotten one single misfire since. i want to know if i can re-gap them to 1.1 to allow for a bigger spark. i'll be running 14psi on the day.

also, what are some things i can look at before putting it on the dyno?

[Ground_FX]

At 14psi, leave them at .8. especially if they are not platinum or iridium plugs.

Check all fluid levels and tyre pressures, and check that all cooling system hoses are in good nick.

[SECURITY]

this may souns a little stupid, but i like to be thorough.

what tyre pressure am i meant to have? ive got 19's.

and my plugs are platinum

[Ground_FX]

19's, sweet. Run 33psi or thereabouts.

[SECURITY]

ive been running 32, is that alright?

also, do bigger wheels have an effect on power? or 1/4 mile times?

[xRHETTx]

No

[paulr33]

why are you running 14psi?

[Baz]

Most places pump tyres up to 50 psi for dyno runs. The tyre pressure your running atm is fine. I run mine at 30psi but yours being a low profile tyre means that its not going to flex much anyway

[SECURITY]

thanks guys

and paulr33, why wouldnt i run 14psi?

[Guest DIRTgarage]

ive been running 32, is that alright?

also, do bigger wheels have an effect on power? or 1/4 mile times?

<{POST_SNAPBACK}>

A larger rolling diameter tyre will give a smaller power reading.....fact and proven.

[ATTN]

hey man bit off topic what mods do you have atm?

what are you hoping to get?

[paulr33]

do you run 14psi on the street? if your on the stock turbo its the sure fire way of killing it, the heat generated by it will kill the exhaust wheel and i doubt it will make any more power if none at all from 12pis to 14psi but there will be lots more heat. even 12psi is risky for the exhaust wheel.

[SECURITY]

i run 10psi on the street. but ill be boosting it up for the run.

[SKYL9]

im running stock turbo and just had a dyno tune at chasers about a month ago where they found i got more power running 10psi than what i was making when i was running 12psi.. more boost isnt allways more power

[SECURITY]

well ill get 3 runs anyway, ill do one on 10, one on 12 and another on 14 and see how i go from there.

how much power should i be expecting?

ive got a 3" turbo back, k&n pod, fmic.

[paulr33]

with stock ecu id say 160rwkw ish ? without piggyback or aftermarket ecu then yeah about there. 12psi and 14psi will do stock boost cut and your power will go out the window if you still have the stock ecu, it detects too much airflow and cuts the timing

[WazR32GTSt]

A larger rolling diameter tyre will give a smaller power reading.....fact and proven.

<{POST_SNAPBACK}>

when people upgrade wheel sizes, they generaly also reduce the profile so that the rolling diameter is still the same - wouldn't think a tyre company would recommend incresing the overall diameter

but even if the overall diameter is the same, then the 19s are probably going to weight a bit more than the stock 16s due to there needing to be more material to make up the larger rim. This would increase rotating mass and thus reduce power transmission through the wheels...

[d00dz]

well ill get 3 runs anyway, ill do one on 10, one on 12 and another on 14 and see how i go from there.

how much power should i be expecting?

ive got a 3" turbo back, k&n pod, fmic.

<{POST_SNAPBACK}>

well 2 weeks ago I dyno'ed my car..

I got 158rwkw. Was quite surpised.

This is stock r33, stock everything. POD and HKS cat back.

On the day stantaic had his auto GTT, that only did 156.0, also a R33 S2 (links's car) did 156.5. Both of them had cat backs and had stock air filter.

[Ronin 09]

As has been said a number of times - dynos are a tuning tool.

I don't understand why you're asking what 'needs' to be done prior to a dyno run... as long as the car is running fine, put in fuel... put on dyno.

I have to ask - why run a higher boost than you run on the street? It won't give you a representative figure of what the car is running in street trim.

If you want a dyno sheet to say that the car makes 4000gigawatts, then just photochop it. Dynos are useful if you use the same dyno, prior to mods, then post mods, on a similar temperature / pressure day, to determine a relative increase of your mods.

[SECURITY]

its not that i want it to show more kw than it is on the street, im just asking questions on what to expect, and you guys have answered all of my queries.. are there any other things to look at besides fuel filter, spark plugs etc?

i just want a clean run.