300rwkw = gt30 + 1jz + boost = Done like a dinner

[jampac]

Ok finally got the power fc fully tuned after 3 sessions, and about 6 hours in total. D-jetro versions of power fc are very time consuming to tune and a lot of work shops cut corners when tuning them to save time and or use the hand controller which is a complete pain if you want to tune it right. My one has been tuned using a combination of fc datalogit on my carpc and the hand controller.

The end result is a factory running vehicle with factory cold and warm setup that runs very smooth on the road, with heaps of power. What this can do when you have bigger and different lag time injectors compared to factory is so superior to a piggy back setup for these aspects it's not funny.

So without further blabing on, here is the results,



The boost peaks at about 23psi initially then tapers down to 21psi by peak power. We did have one run that had 24psi initially down to 22psi, but timing was out of it, so power was down.



This is the log from FC datalogit of that run. Note the timing at 6000rpm and boost of 154 which is about 21.5psi. There is virtually no knocking.



This one was a few runs before when we tried to find the knock point. Slightly less boost but lots of knock, not audible in cabin. This gave about another 8rwkw, but not a safe tune. There is 3 degrees more timing thats enough to put it over the edge.

Yavuz gave me three different dyno graphs according to horsepower heros spec, his own dyno day spec and his own dyno tuning spec. All 3 gave different results. The one you see is the horsepower heros spec which is what rotormaster runs for his dynos, so i've gained about 17rwkw from before, due to changing to a power fc and getting gearbox rebuilt, and a touch more boost, but it was much hotter today than when it was tuned a rotormaster for that 270rwkw I had before. For the record yavuz dyno day spec put me at 278rwkw. Also due to running semi slicks I loose about 5-8rwkw on the dyno. This is known by many tuners.

Also some maybe wondering why the graph drops off quickly (the mixtures also get rich when this happens) at 6200rpm. This appears to be due to a problem with the boost level. We found at 13psi of boost that problem didn't occur, but as we got up to 20psi it started to drop off at 6200rpm, sharper and sharper as boost increased. Yavuz suspects the valve springs on a 1jz may not be quiet up to the task or even the oil I'm using maybe causing a tiny amount of valve bounce. I'll probably need to run a thicker oil. I think from memory I have 10w-30 in it.

Also happy to the report the rebuilt gearbox ran awesome. The dyno run was using the lockup on the converter from 2000rpm. This tends to make a nice manual like dyno curve and tuning is so much easier.

So the question; is 300rwkw possible on a GT3076R turbo without cams? It is with the right things in place, like regular street tyres, the right dyno power mode, and with a bit of knock in the engine.

[allmtr]

I would never have thought that size turbo would get a 1jz to that kind of power....

[30psi 4agte]

I have never heard of loosing power on the dyno from running semi slick rubber.

Is that what the bloke reccons ??

P.S congrats on the grunt !

[JustenGT8]

Dynos shread semi slick tyres...made that mistake once myself. Dunno if they effect power readings but were pretty much rooted after half a dozen runs, they just get too hot.

[30psi 4agte]

Dynos shread semi slick tyres...made that mistake once myself. Dunno if they effect power readings but were pretty much rooted after half a dozen runs, they just get too hot.

Yeah i know about that one ! but the loss of hp i hadnt heard.

[1JZ-Rolla]

due to running semi slicks I loose about 5-8rwkw on the dyno. This is known by many tuners.

I've heard this too, would be interesting to see some back to back runs to really compare.

Must be to do with extra frictional losses or something? Perhaps related to the reason that they standardise all car's to 50psi tyre pressure for most high-end dyno comps maybe?

[chris davey]

Great results Ben.

What fuel were you using?

Very interesting re the timing on those logs. I get the top one to be about 22.5psi and the bottom one 21.5psi. So even with 1psi less boost, the 3 deg timing is too much for it.

Interestingly enough, my proposed timing map had 19deg at 6000rpm at 20psi and 15deg at 24psi so 17deg at 22psi. I think I will pull a degree out of that. (I can send you the map if you want) Although, I don't intend on running that much boost anyway.

[jampac]

100ron shell fuel, v-power racing stuff. Yeah the timing seemed to make it knock the most. With the right timing in it, seemed be able to run quiet a lot of boost, like up 25psi reckon. On the drive back from riverstone today, I recorded 1.73 kg/cm2 (24.6psi) of boost peak in 2nd gear. The knock value was only 10, so way off the threshold of 40 we have set.

As for the semi slick thing, both yavuz at unigroup and joe at rotormaster told me with semis you loose power on dyno runs. Also best to have high pressure as possible to record high numbers

[jampac]

I would never have thought that size turbo would get a 1jz to that kind of power....

I've already run 113.5mph trap with no stall convertor lockup, so it's got some trap speed in it still. Probably looking at 117mph with new setup and stall convertor locking in 3rd gear. With the weight of the vehicle, atleast 1600kg + my weight, would be close to 1700kg, that means its making the power. I'm hoping i can run a high 11 next time at wsid, when they'll kick me out for no super street license.

[jampac]

Update....



Was done at soarercentral sydney dyno day at unigroup engineering. I cleaned out the intercooler and got a blitz sbc ID3 to control the boost, and a bit more boost. Seems to have gotten me over the edge.

[chris davey]

Congrats Ben!!! Achieved your goal.

Time to change the thread title as well.

304rwkw from 23psi with a smallish turbo is pretty bloody good in my books!

I seriously need to up the boost on my car now

[BMWTurbo]

Does that mean you knocked me off from highest Auto 1jzgte soarer on the soarecentral dyno list??

[Ben Wilson]

Dynos shread semi slick tyres...made that mistake once myself. Dunno if they effect power readings but were pretty much rooted after half a dozen runs, they just get too hot.

You should see what they do to rally tyres....

[jampac]

Does that mean you knocked me off from highest Auto 1jzgte soarer on the soarecentral dyno list??

Your the one on 301?

[BMWTurbo]

402.8RWHP 300.59RWKW.... was YEARS ago though...