Top RB20 Club... do you have over 260rwkw?

[Roy]

I cant say that the engine will happily rev that hard forever, but the last couple of track days and a skidpan day i have been using about 8,200-8,300rpm (cant remember exactly).

I have my multi stage shift lights set between 7,500 and 8,150rpm. Im amazed how much i need the shift lights as with the external gate and the revs im pulling, my instinct is to grab gears way sooner...as it sounds like its about to take off into orbit. So i shift on the 8,150rpm light...and so far so good...

Though that want at that high a boost level, when i start runnign 20psi, i will pull the rev limit back to abtou 7,500rp, with perhaps one lap where i stretch it out all the way to 8,000rpm.

[carl h]

ive found that my oil pump isnt too happy with me right now, fine metalic in the filter.

have been limiting trips to 8k and running 20w50 oil in the car and she seems to be doing better.

[180bfj20det]

Quincy, the setup you have is one that is awesome. The power you have is very good and smack on the limit of pump fuel for your displacement from what I have gathered. Any more mods may yield you a little bit more power....but they will be much more expensive and plus youll lose drivability......I decided to stop at the stage im at with my NA block FJ20.....as 230rwkw aint bad on pump and high compression. The money involved in getting more oout of it just aint worth it.....displacement is the key for cheap power!!!

Well DONE again, its da shit!

Edited September 7, 2005 by 180bfj20det

[Roy]

ive found that my oil pump isnt too happy with me right now, fine metalic in the filter.

have been limiting trips to 8k and running 20w50 oil in the car and she seems to be doing better.

<{POST_SNAPBACK}>

So you think its the oil pump thats causing the swarf in the engine?

When do you think you are going to get the tune / ignition sorted on your car? Im curious to know how much better response you can get ouyt of your turbo setup?

It seems you have about

- 100rwkws @ 4,500rpm

- 160rwkws @ 4,900rpm

- 220rwkws @ 5,500rpm

- 240rwkws @ 6,100rpm

- 280rwkws @ 7,300rpm

Do you think your setup when tweaked will better :

- 195rwkws @ 4,500rpm

- 219rwkws @ 5,000rpm

- 224rwkws @ 5,500rpm

- 234rwkws @ 6,250rpm

Just curious to know how much improvement in response is left in it, and also what boost level you were running when you pulle the 280rwkws?

[carl h]

So you think its the oil pump thats causing the swarf in the engine?

When do you think you are going to get the tune / ignition sorted on your car? Im curious to know how much better response you can get ouyt of your turbo setup?

It seems you have about

- 100rwkws @ 4,500rpm

- 160rwkws @ 4,900rpm

- 220rwkws @ 5,500rpm

- 240rwkws @ 6,100rpm

- 280rwkws @ 7,300rpm

Do you think your setup when tweaked will better :

- 195rwkws @ 4,500rpm 

- 219rwkws @ 5,000rpm 

- 224rwkws @ 5,500rpm

- 234rwkws @ 6,250rpm 

Just curious to know how much improvement in response is left in it, and also what boost level you were running when you pulle the 280rwkws?

<{POST_SNAPBACK}>

yeah i think that the oilpump is culprit because when i drain oil out of the sump its free of metalic where as when i pull the filter it drains off very fine flake......

as far as turbo response its a given that since this is a large turbo on a 20 its gonna be a bit laggy but im almost postive that with more fuel on spool up and some cam tweaking i should get a better response and more power over all.

right now as it stands im not making good power because of the emanage, the ecu has a hot timing map and by using the emanage it just messes it up so that its in the wrong spots on the maps........

ive got a BIKIrom on order from lucas in australia but being in the us means i get to wait for parts........however if i can enrichen the actual fuel map then i should see an even better response and more power under the curve which would make my day.

as for boost when i pulled 288rwkw it was at 17psi, so moderate boost levels with room to go......

[RBsileighty]

Wow... sorry carl... didn't read before quincy's post... of course that was you I was talking about.

I never knew starting this thread would lead to 36+ pages of postings! This is awesome for the 20 guys!

[boostn32]

yes this is a great read. if any one ever needs info on rb20 engines and turbo set up this is the place to be.

[quincy777]

Anyone here decreased the diameter of there intake pipes to increase spool time.

As you all know I am getting 1 bar at about 4rpm and not gett max power until 8250rpm. @ 22psi

If I decreased intake from 2 1/4 down to 2 inch would this help response and spool further AND choke the turbo earlier so peak can be made near 7500rpm not 8250rpm.

Cheers

[Roy]

Looking at you r boost curve...im guessing something can be done to improve response based around a better form of boost control. It seems to ramp up onto boost then the gradient slows, when normally its the opposite, isnt it?

I wouldnt go decreasing the diam of pipes though.

Also the dyno says 15psi at 145km/h, thats up around 5,000rpm isnt it?

[quincy777]

not sure about speed, I just looked at boost and revs when driving. But yea comes on then lulls then comes on hard again. So yea not normal I wouldn't have thought either.

Does it sound like actuator might need to be adjusted??

[boostn32]

hey roy do u have a 10cm rear housing, that i could borrow to see what results i will get compared to my 8cm, been told i will have to much back pressure.

[Roy]

I friend may have one for sale. I use to have the 10cm housing, i went to an 8cm housing and think its the way to go.

So if your making 260-280rwks , about the limit of the turbo allowing for differences in dynos...then id say there is jack in it with regards to the smaller housing being a restriction on a 2L

If the 8cm housing caused too much back pressure, i dont think the above plots would look like they do.

Its easy to drill and tap the exhaust housing and put a pressure gauge in there to see what the back pressure is....and when your don use the threaded hole for an EGT

[Roy]

And all my talk about the rpm at which my car makes boost, well i dont think its as responsive as the above plot suggests. The above uses a calculation to convert road speed to rpm, and i suspect the data on Dunlops website for the tyres i run is incorrect, or the tyres distort on the rollers chanding the gearing ?!?!?!?

But my dyno run was too the limiter which i think was set at 7,800rpm Using my calc it only goes to 7,000rpm for 182km/h which isnt right.

Next day at the track ill get the data from the data logger so that i can see rpm vs boost for each gear...that is far more accurate rather then converting road speed.

[boostn32]

yeah i will be putting a pressure gauge in the manifold to measure back pressure during tuning, to much back pressure = heat and heat = damaged head and valves, not what you want when u have spent a lot of money on the head.

Edited September 9, 2005 by boostn32

[DRIFTER]

after wanting to burn my car, i have finally got a decent power figure-244rwkw. this is with standard motor, standard cams and cam gears set at 5 degrees advance. my gtr injectors are now at 100% duty cycle, does anyone know what is the maximum duty cycle that is safe to run. i have no idea how to post up the dyno sheet.

[carl h]

after wanting to burn my car, i have finally got a decent power figure-244rwkw. this is with standard motor, standard cams and cam gears set at 5 degrees advance. my gtr injectors are now at 100% duty cycle, does anyone know what is the maximum duty cycle that is safe to run. i have no idea how to post up the dyno sheet.

<{POST_SNAPBACK}>

well over here stateside we like to run ours at about 80-85%, i know some guys in japan and nz will push it up to 95% but thats just too much, the injector needs time to cycle and cool.

[Sydneykid]

right now as it stands im not making good power because of the emanage, the ecu has a hot timing map and by using the emanage it just messes it up so that its in the wrong spots on the maps........

Hi Carl, can you give us any more info on this problem? Are you simply using the EManage to bend the AFM voltages? How much correction do you have loaded? What about ignition timing? Bascially any extra info you have would be useful.

cheers

PS, I would get the oil tested (Castrol Technical do it), that will tell you what metal it is in the oil filter. It would be nice to know if it's not bearing material.

[DRIFTER]

well over here stateside we like to run ours at about 80-85%, i know some guys in japan and nz will push it up to 95% but thats just too much, the injector needs time to cycle and cool.

<{POST_SNAPBACK}>

well i could probably turn my fuel preasure up and reduce my milli seconds but it will probably stuff up the map. is there any way to do this accurately without putting it back on the dyno?

[carl h]

Hi Carl, can you give us any more info on this problem?  Are you simply using the EManage to bend the AFM voltages?  How much correction do you have loaded?  What about ignition timing?  Bascially any extra info you have would be useful.

cheers

PS, I would get the oil tested (Castrol Technical do it), that will tell you what metal it is in the oil filter.  It would be nice to know if it's not bearing material.

<{POST_SNAPBACK}>

hehe, yeah there is a place here stateside that will test oil for whats floating around in it......

yeah im using the emanage to fork with the maf signal (which it does do well) but since the ecu has an agressive timing map (actualy on the ecu) forking around with the maf voltage makes it feel terrible if i do it too much.

if i dont use the emanage to correct it runs too lean due to the timing map...... so its a catch 22 untill i can get the biki rom where i can see where i am on the maps.

there isnt that much correction on the map like +10 pts which isnt too terribly much but its enough to fork with the signal enough to really make it feel weird.

from what it looks like i might be able to get full boost at 4k assuming i can add fuel in the right spots (which i cant do with the emanage right now) and it should have a fairly beast/wide power curve if i can get it that way......

i will let you guys know my results tho for sure, because once the car spools its frightenly quick.

[RNS11Z]

got a message earlier on from pete today, 520rwhp with less timing and slightly more boost. go the rb20