Oztrack 274rwkw baby cam

[Oztrack Tuning]

Just had another session on the dyno. Very pleased with the result.:)

Got good gain from the BBK 80mm TB and 160 F Thermostat.
The tune was the same above 5000rpm as my 11.619/116 run

It made 274rwkw locked and an even better 273rwkw unlocked. (wish that run was locked :headbang: )

http://www.oztrack.com/clubsport/274kw.jpg

[Delft Maloo]

Can you tell the difference in drivability with the new tb in place.
Good figures too, what size cam do you run. Ive seen your car at the big meets at wsid it launches well too, top effort.:bravo:

[Oztrack Tuning]

It feels similar to before
but its quicker at the strip. It seems to have picked up everywhere - its hard to tell on the road as its beyond the tyres until pretty high speeds at WOT but at part throttle it feels good.

Economy is the same.

[Delft Maloo]

Im Currently looking at a come cam 218-224 and higgins tb to liven up the calais abit, track times arnt that important for me but a good kick up the but when i need to stomp it. Off topic,are you going up to willowbank for the winters ?

[Oztrack Tuning]

It seems to have been a good choice of cam and combination.

I would have like to have gone to Willowbank - but im out of money to spend to get there with the support needed etc.

[team illucid]

nice results Oztrack

[clarkey62]

Sorry in advance for whats probably a stupid question but whats the difference between locked and unlocked on a dyno?

Cheers Alan

[Oztrack Tuning]

The converter can be locked up to make it slip less on the dyno. This usually makes a difference of at least 6rwkw on these converters and maybe sometimes up to 10rwkw. On some converters that are more inefficient it can be 15+.

A manual car would be more efficient at peak power
connected to the same engine and would have another 3-5% above locked.

You will notice though - that when it is locked it doesnt allow the converter to do its positive thing and multiply torque and actually make more power when compared at the same road speed. It only helps at and near peak power. A manual gearbox would have a power curve similar in shape a little above the locked one - but would be well below the unlocked curve most of the way.

[DaveHAT]

Steve,

Not being a smart arse but stating that your car made 274rwkw with a baby cam is a bit misleading isn't it?

From memory you also have 1.8 roller rockers and headwork done which would be adding a little something to the equation wouldnt't they?

I only say that for those who might read this and think those numbers are standard fare if they go and slip in a 216/220 sized cam ONLY.

Nice figure non the less. :)

[Oztrack Tuning]

Hi Dave
Its pretty common knowledge it has all the other stuff - its plastered all over the net! Also i dont sell cams so its not like it advertising!

I didnt even think of it like that - its interesting that people said the heads would not help with a cam this small. It effectively is acting like a 218 222 with 555 on 114 lsa. The heads are ported and matched to both inlet and exhaust to the extractors which are 1"5/8 short 4 into 1s. The runs were done with my full road exhaust on. Using a Charlie Maxiflow OTRCAI.

If it was a M6 it would have been at least 282rwkw but more likely up near 290

[Oztrack Tuning]

I didnt mention the TB is a BBK 80mm polished and was fitted at this stage without the spacer - so there is a step between it and the manifold. It was supplied to me by RebelSS.

I am still amazed at the gains right through the range - i thought any gain would be up the top only.

[HSVJPL]

Steve,

Not being a smart arse but stating that your car made 274rwkw with a baby cam is a bit misleading isn't it?

From memory you also have 1.8 roller rockers and headwork done which would be adding a little something to the equation wouldnt't they?

I only say that for those who might read this and think those numbers are standard fare if they go and slip in a 216/220 sized cam ONLY.

Nice figure non the less. :)

Gotta say I agree with Tiger SS,

The title of this thread is pretty misleading, nonetheless great results.

[Oztrack Tuning]

The reason i chose that title - is that it is short. Also that many people on this forum bagged my choice of camshaft and said it wouldnt perform to my expectations over 12 months ago. I have proven them wrong on 2 counts. ....its been fun doing something by an alternate route.

[vyssbeast]

IF your car is making that much power, isnt 4-1 1(5/8) considered alittle small and restrictive?? I dont know all that much but i think maybe 1(3/4) or possibly 1(7/8) might actually give you abit more of a kick. At the moment you dont really know how much the 1(5/8) could be holding you back
But with that much power it doesnt matter i guess thats an awesome result but if your after every last kw i think there is abit to gain in upgrading headers.

cheers

[Oztrack Tuning]

I have considered going for some long tube large collector headers like the ones sold by quicktime performance in USA.

The extractors are matched to the exhaust ports and this might be helping - so the theory is that larger ones might not help as much as expected because they wont be matched. My cats are hi flow metal and the exhaust is very good i think.

Its possible there would be more to gain - but it could also result in maybe $1000 or so spent for nothing. I was thinking the best choice might be a bigger system right through and these extractors or ones like them. What do people think??

http://www.quicktimeperformance.com/Headers/ls1headers.php

[vyssbeast]

probably need one of the sponsers to give a professional opinion... Thunder??
would bigger primaries make much difference going into the same size collector?? (bit of a beginner still)