Power Output with an Auto

[WazR32GTSt]

mre, don't u find that after about 6500 rpm the power tends to ease off a bit? i back off the accelerator at about 6000rpm and so it usually reacts by 6500rpm and changes then i floor it again...seems to keep the car in optimum torque range but i think this causes you to lose boost. only really works for 1st -> 2nd gear but just thought someone else may have used this approach...

[Gester]

Well I took my car to CES Racing in Bris to get my exhaust changed and we did a dyno to show before and after. It wasn't in Shootout mode just normal and it got 146rwkw completely stock. The car is just a few days old and nothing has been touched. I thought this is a bit hight for a stock gts specially an auto, is it?

Also they hooked a boost gauge up just for the dyno and it only runs 5psi when it should be like 6 or 7psi?

Well I'm not complaining but yeah the twin dump full exhaust should be a good boost. Also getting the car dynoed after the exhaust tomorrow so will be interesting to see how much better it is... I cant wait

Plus next friday I'm getting the S-AFC II and the ebc installed and tuned as well. Will probaly run the boost to at least 12psi. Anyone think over 190rwkw with the auto is possible with only these mods?

[hippy]

gester .. please let us know what the results are, please post some dynos up please

[fatz]

your r33 autos r shifting at 7800 rpm

that cant be right redline cutout is 7000

pete

[Gester]

When they dynoe'd mine they shifted it manually at 6000 or it could of been 6500.

hippy yeah I get the comparison dyno paper today

It better give me at least 10rwkw.... bah things are so expensive for little power

[Gester]

Well I got quite a surprise when it made 177rwkw with the new exhaust. Had no idea it would give that much more.

I couldn't get the dyno sheet cause the shop was already shut when I picked it up and I just picked it up from the front but yeah so far completely stock automatic r33 except the exhaust.

Could it of been the dyno? It was a Bosch Power Test dyno. Does this matter or affect it?

[giz01]

From what i have seen the C.E.S twin dump systems seem to make similar top end to other 3" systems but they seem to make more mid-range power.

My gf's auto S14 ran a best of 13.759@102mph@willowbank with C.E.S 3" HPC twin dump system, O2 rush pod filter & 14psi.

It's best 60ft was 2.16 & i found that stalling it up on the line & having it just turn the tyres slowly then off the brake, i would get a little bit of wheelspin but because i had about 5psi off the line it would 60ft well.

The fastest 200sx in Oz before the green ghost was a low 12 @ 120ish mph with std auto & 3000rpm dominator convertor.

The skyline uses the same auto!

[hippy]

can u tell us what exhaust u got?? what is the CES twin dump system?? sounds like i should get one

[giz01]

www.cesracing.com.au

Trevor is the owner.

Mates TT300zx picked up 20rwkw's mid range with his twin 3" hpc coated dump pipes & 1/4 went from 12.8 @166kph to 12.56@182kph

[hippy]

is that a 3k high stall?? i mean when u say 3000 donminator??

[giz01]

Yes 3000rpm convertor from dominator convertors, but you don't need to spend that much money to get one, you can get your std one done for $250-$300 from The convertor shop in Brisbane as i previously said. It may be an idea to even get a bigger trans cooler for longevity. And change the trans oil @ least every 20000km with genuine Nissan oil which is a synthetic, we get ours from the local Nissan dealer & just take in a 5L container & they fill it from there 44gallon drum. It only takes about an hour to change it, Its a good idea to remove the pan & clean the mesh filter as well, but make sure you clean it all perfectly as you don't want ANY crap getting into the internals of the auto, & from memory the gasket was about $50. My mate has been using Mobils auto trans replacement oil in his 300zx but changes it every 10000km or so which maybe another option but it is not synthetic, hence the reason he changes it more often.

[Guilt-Toy]

i was running up to 12 psi boost on mine.

I have heard from many people that the JATCO auto gearbox in the jap cars are not good for anything over 180rwkw. You will spit it out like I did.

Get a manual. you have a 4.3:1 dif ratio.. you will get a second difference down the quarter

[ron]

hi,

mines an auto with 170rwKW. it changes or bounc at around

7150 RPM.

but to be honest my stock turbo gives less after about 6500.

when i used to run i backed off at just before redline and the box quickly shift, then i hammer it again (you will feel that the clutch packs will bites much harder then letting the computer shift.

i would not recommend high stalling the converter if the car is going to be drove regularly as it is already bloody thirsty!!!

do what MRE did of holding the handbrake as well when launching

and yes!!! AUTOs are much quicker than everyone thought!!!!

ron

[Gester]

Hey Ron, yeah they are quicker then I thought it'd be

But I have 177rwkw although I have a big flatspot at 110 where my power is completely linear upto this point but drops to 60rwkw which sucks. Then by 140kph its back up and by 180kph its at 177rwkw.

This is a really annoying dip but I dont go past 110 often but I think its something to do with the stock bov. Does anyone know what could cause such a dip? I think its around the gear change.

And I feel the most power over 6000rpm... heh its weird. Apparently I dont reach my max boost efficiency with my turbo until then, according to the guy who dynoed it. Im only running 5psi.

[Guest RedLineGTR]

the stock bov has a hole on the inside that releases boost, take it off if you have as sec and have a look, get a aftermarket bov plump back, or take the old one off and block the whole with a screw.

[Gester]

Would that fix the power drop though? Its not bad to do this?