RB30 precision 6262 dyno

[ST240]

[youtube]http://www.youtube.com/watch?v=PfnZKjEbILI[/youtube]

I've already established that my turbo setup isn't ideal, but I decided to dyno it on a whim (at exactly 12pm today) before the snow flies. HP Solutions got me in for 3:30pm. Awesome.

RB30 stock bottom end
R32 RB25DE head
Precision 6262 .58 T4
Nistune'd by myself



This thing is running PIG rich; when I got in there it wouldnt even register on the sniffer (<10:1). I should have tuned that out beforehand. I pulled some fuel and it went from 350 to 370 HP and it still didnt even register on the sniffer. With more fuel pull/timing add 400 rwhp is certainly possible. Not bad for the JB 6262. I'm impressed. The only downside is the .58 rear is choking it above 5800. Operator let off at 6500.

RB26 head and maybe a different turbo this winter .

Edit: wtf is up with the img thing. The pics never show. And theyre hosted externally :/.

[RRRRB]

Pretty decent power considering, what kinda timing is in it?

Turn that boost up and get a bigger turbine housing on it and it should make some good power...

The RB25DE head has smaller ports than the RB25DET and RB26 right?? what cams are in it?

[ST240]

Smaller than the RB25DET but larger than the RB20DET ports. Yeah I'll loose spool tho I think. Stock RB25DE cams in it; the auzzies have had really good results with them. But I got my hands on a 26 head .

[Shocker]

That turbo seems a little bit laggy for its size on a 3.0. Your 100% stock compression? I think the big thing I noticed from the 25/26 to 30 swap is a restriction past ~6500. For you like you said it seems even more exaggerated due to the RB20 head. I added 3.5" inch exhaust and it definitely helped everywhere, even on low end out of boost torque the car become much more responsive. Like you have a small turbine housing also not helping flow up top. Personally a .58 a/r is too small on a 3.0 liter haha.

You were speaking about a sniffer, so I'm assuming you didn't know your a/f's until you got on the dyno? If that's the case get an AFX in that car and get the fuel up to 11.0-11.4 through boost.

[ST240]

.58 IS way too small for the 3.0 L :p. Yeah i was sub 10:1 lol. I just didnt wanna spend a pile tuning if I'm completely changing the setup this winter. What turbo are you running? I was thinking of trying a BW S300SX 83-75 1.00.

Really, you noticed that with the 25DE head too? I thought it was my rear housing. I have no doubt the 26 head will help a ton. Just looking at the valves and ports alone will make a difference let alone the itbs and cams.

[Shocker]

My build thread is a few posts down check it out. Right now I'm runnning a 6765 cast .68 a/r

[RRRRB]

isnt that just a "PT67" never heard of a cast 6765 , i suppose thats probably what it is though

[Shocker]

isnt that just a "PT67" never heard of a cast 6765 , i suppose thats probably what it is though

Stating the fact its not a billet, comp wheel is cast, unlike the new ones, now they have CEA turbines making um even better....

[Jimefam]

Just as an aside the rb25det head will flow the same as the 26.

[ST240]

Just as an aside the rb25det head will flow the same as the 26.

The 25det does but does the 25de? The intake and exhaut ports as well as valves are bigger on the 26 than the 25de.

[ST240]

My build thread is a few posts down check it out. Right now I'm runnning a 6765 cast .68 a/r

Sick a** times man. Are runing the stage 5 unsprung clutch? I couldnt for the life of me launch my RB30 without bogging it with my four puck ACT. Did you get to try a 2step launch?

A guy locally has a used BB 6765 .86 T4 he's willing to sell for a decent price, perhaps i should jump on it instead of the smaller borg warner s300sx 83-75 (~60mm) I was planning on...

I just want 11s lol.

[Shocker]

Yeah running a spec stg 5. I just slip it no two step... Next year ill work on harder launches and 10s I certainly have the mph for it.

What I see with a 30 is you can still have a damn good powerband with a 67 as well as awesome power for the street on pump gas. With the new 6766 and properly built 30 600whp should be obtainable on pump 93.

Is the 6765 a billet comp wheel?

[RRRRB]

where are you guys getting these rb30 blocks?

[ST240]

Yeah running a spec stg 5. I just slip it no two step... Next year ill work on harder launches and 10s I certainly have the mph for it.

What I see with a 30 is you can still have a damn good powerband with a 67 as well as awesome power for the street on pump gas. With the new 6766 and properly built 30 600whp should be obtainable on pump 93.

Is the 6765 a billet comp wheel?

No it's cast. Is yours a BB unit? I saw a 2jz 6765 dyno chart and I didnt really like the looks of it . It may be a touch too big for my goals.

[ST240]

where are you guys getting these rb30 blocks?

A guy i my province imported about 6 of them...

[Shocker]

where are you guys getting these rb30 blocks?

Imported my own from a dealer in the au.

ST we make the same torque and Hp before 4k then after that my gains are much higher. Compare my chart to urs.

[RRRRB]

i bet its from the the 26 head and cams, the 26 cams are quite a bit bigger than the rb25det im sure the 25de cams are close to the same

[Jimefam]

Just as an aside the rb25det head will flow the same as the 26.

The 25det does but does the 25de? The intake and exhaut ports as well as valves are bigger on the 26 than the 25de.

Probably not but I meant that if your purchasing a head for a 30 short block I'd go with the 25 as people practically give them away vs what people want for a 26. With the difference you can do a good bit to the 25 head. Either way it's a moot point I think you said you've bought a 26 already.

[Darius]

Probably not but I meant that if your purchasing a head for a 30 short block I'd go with the 25 as people practically give them away vs what people want for a 26. With the difference you can do a good bit to the 25 head. Either way it's a moot point I think you said you've bought a 26 already.

Agreed! The main reason to go with an RB26 head would be to have the solid lifters for raising the rev limit considerably. But if your head is not flowing enough air at those revs to make good power, it isn't going to be worth it anyways. With the RB30 block, you're not likely going to be revving above 8000 rpm without building the bottom end, so the RB25 head is probably adequate. Plus, you can put the money saved towards upgrading valve train parts.

Here's a quote from SAU from RIPS:
"Just to clarify a few points.

I agree with the above guys, there is absolutely no point in revving the engine to 9000rpm unless your still making good power at that point, you will probably find your motor will be falling away at around 7800-8000rpm.

The RB30 in the 240z has a stock crank (with our mods) stock cradle, stock mains bolts, perfect balancing, top class pistons and rods, normal tomei pump, normal wide type oil pump drive, RIPS wet sump and a world class cylinder head built to cope with 11,000-12,000rpm.

We regularaly run 9000-9500rpm and power is still climbing at that point, we hit 10,000+ during the burnout at times and have seen over 11,000rpm over bumps or when sudden wheelspin has occured.

Its not just a matter of putting the above parts together and its going to rev that high, I assure you there is ALOT more to it than that but with correct preperation, blueprinting and very anal assembly we have proven reliable at around 1400hp at those rpm levels.

My advise would be keep the rpm as low as possible to get the power you want.

Robbie."

[ST240]

I'm not poo pooing, but it looks like he's specifically talking about revs in that quote.

But i recognise your point. It allows one to rev higher which, if all other systems are in line, allowes more power to be produced. But I don't believe that is the sole benefit from that head alone. I feel there is a misconception that suddenly because an engine has forced induction, flow restrictions do not matter anymore. Just ask the V8 guys about their flow restrictions . Case in point, I switched from a poorly designed intercooler to "decent" one and the difference at the same boost was astounding.

The head is no exception from this rule. I think it will produce gains in boost regardless of rpm.

Thoughts?

Edit: I should damn near do a before and after dyno, switching nothing but the head .

[Shocker]

Ports on the 25 and 26 are the same. Id bet you would see a difference since the 26 head has more lift and duration.

[julio]

I am a little curious as to why you setup is so lazy. I would expect your car to hit 1 bar by 3,500 rpms, not above 4,000 rpms as the graph shows. 3.0L + a 62mm excuder turbine wheel surrounded by a .58 a/r housing should be a fast and snappy reacting setup. I also noticed the sharp change in torque delivery around 3,700-3,800 rpms on both runs. Looking at your boost and a/f curves, I would lean torwards timing as the culprit. This may also be a clue as to why you are seemingly missing some low end. The only time I have seen dramatic changes in the slope of a torque curve is when a car has a knock sensore issue. The ecu will be under the knock map until a certain rpm (knock sensor ignored due to mechanical noise) and then switch to the normal map at an instant throwning a bunch more timing at it.

Have you confirmed base timing? Are you getting any knock or a det sensor fault in NisTune? Just some thoughts.


My example of a really really bad knock sensore issue on the dyno:

[ST240]

Ports on the 25 and 26 are the same. Id bet you would see a difference since the 26 head has more lift and duration.

25DET yes, 25DE no. The 25DE's are bigger than RB20 ports, but smaller than 25DET ports. I agree about the cams.

I am a little curious as to why you setup is so lazy.

Have you confirmed base timing? Are you getting any knock or a det sensor fault in NisTune? Just some thoughts.

You may be on to something here, I didn't do a knock map copy. I think Nistune shows which map its accesssing now; I wasn't watching my laptop lol. But I have also killed my timing severely to the point where I think it dips into the 15*s before the turbo even starts to spool.

[Darius]

Woah teens are way too low! You have a ton of power to unleash there my friend!

[Shocker]

Ports on the 25 and 26 are the same. Id bet you would see a difference since the 26 head has more lift and duration.

25DET yes, 25DE no. The 25DE's are bigger than RB20 ports, but smaller than 25DET ports. I agree about the cams.

Whats what I was getting at.

As for timing to help you out. I'm running 26-30 degrees from -9 psi down to 20 degrees at 0 vac, then tapering down to 16 degrees by 20 psi. We added timing to the big end on the dyno and saw only a few HP gain, so we backed it off. Could I be less conservative, most likely yes, but I'd rather play it a little safe.

As someone already stated with that turbo you'd expect full hit around ~3500-3700 rpms, especially with that a/r.

[julio]

Shocker: so you dont roll the timing up at all after peak torque?

[Shocker]

Shocker: so you dont roll the timing up at all after peak torque?

We did that on the dyno, I gained 8 hp with 2 degrees added (peak tq on). We took away 2 degrees from our initial (peak tq on) and I lost almost 40 hp. No sense in riding the knock threshold for a few ponies.

[julio]

I understand, I just thought it very interesting that your setup didn't benefit from extra timing after torque peak. I wonder if this was from too much backpressure from the relatively small .68 housing coupled with your previous exhaust. I would be interested to see you hit the dyno again with the new exhaust, try and play with the timing, and then compare all 3 dyno graphs.

[Shocker]

I understand, I just thought it very interesting that your setup didn't benefit from extra timing after torque peak. I wonder if this was from too much backpressure from the relatively small .68 housing coupled with your previous exhaust. I would be interested to see you hit the dyno again with the new exhaust, try and play with the timing, and then compare all 3 dyno graphs.

Yeah that's how it felt on the dyno as well the time, definitely some type of restriction. I never got it to work out getting back on it, but judging by my now out of gear 1/4 miles I'd assume the gain is 20-40 whp ish (also by the extra fuel it took)