Thursday, August 14, 2008 - 02:43 pm, by: Christian Molenda(Christof)
Cihan Aday wrote on Thursday, August 14, 2008 - 02:18 pm:
S15 gt28's @ 20psi will push 320-340rwkw with a well endowed 1JZ.
This was tried and tested on Juice's old TT a few years back. he was only managing 360rwhp on 22psi.
He is a mate of mine and sold the car a while back.
That was with all supporting mods also. He ended up going to a large t04 turbo and got a little more power from that. The car was written of about 2 years ago by the "new owner". I believe this turbo ended up in lews workshop and on another soarer after that.
Thursday, August 14, 2008 - 04:44 pm, by: Shane McInnes(Soarin_tt)
Hey Barry,
Injectors are not an issue, As Morgan and Cihan have proved with the 440cc Injectors you can make 296-300rwkw at 100% Duty Cycle.
Daniel Clarke has proven with Standard Injectors you can make 260rwkw
I think we can rule out Injectors.
Turbos being too small is defiantly not the case as i did make 271rwkw last year with the GT25 centres, you have to remember that these are GT28 centres, much bigger then standard turbos. Standard turbos would be maxing out at 250-260rwkw.
As for Dyno graphs i didnt even bother getting it printed out as it was no interest to me, we got the power band to change a few different times with adjusting the cam gears and adjusting the tune. I can get it to continually make power up untill redline or it can shoot up to 260rwkw by 5500rpm then just be a straighline till 7000rpm either way it just wont go over 260rwkw.
So as i said i gotta get the exhaust looked at because there is a blockage there somewhere (fingers crossed there is) because unbolting the exhaust made 276rwkw which was untuned.
Theres nothing wrong with the Tuner or the ECU im using, the tuner actually said im getting enough air and fuel to be making 290-300rwkw but its a matter off finding the restriction. Its puzzled him aswell. Along with the rest of us.
Cihan i think thats all i can do is extrude hone and see how it goes, plus check resonators. If it dont make power after that i give up lol Ill start saving for a single hahaha.
Thursday, August 14, 2008 - 05:47 pm, by: Cihan Aday(Cihan)
Christian Molenda wrote on Thursday, August 14, 2008 - 02:43 pm:
This was tried and tested on Juice's old TT a few years back. he was only managing 360rwhp on 22psi.
He is a mate of mine and sold the car a while back.
Robert Day's Celica - dyno day a month or two back.
Stock 1JZ, Twin 28R's off S15, custom ex manifolds, big fmic, 264/264 camshafts and a custom intake manifold.
Should have no problem making 360rwkw+ with good fuel and 25-28psi.
I think the problem with 1JZs/Soarer's in general is; A- a340 series automatic transmissions and slippage B- 1JZ/2JZ don't have very good dynamic compression when they're aged (heavy spring pressures eating seats?). C- most exhaust setups are restrictive because of space limitations.
Thursday, August 14, 2008 - 06:02 pm, by: Cihan Aday(Cihan)
Joe's car, also on dyno day. Slipping automatic. T3G's with aftermarket dumps, into twin 2.5inch exhausts all the way. HKS 264/264cams.
I've seen 280 odd with this the last time we tuned it but the auto is giving way. Back in the day when the clutches were okay, power kept rising until 7,700rpm or so.
Based on these two examples Shane, you have plenty of room for improvement Just need to sort out the bugs.
Thursday, August 14, 2008 - 07:18 pm, by: Daniel Clarke(Dieseltrain)
In my opnion, i think the exhaust manifolds are too restrictive.. Changing the exhaust housing to a twin forward facing setup like a GTR would be the go... Definatley would improve flow out of the head thats for sure!
But as it is, check the resonators... There is something stopping this thing from making good power...
1 Thing i just thought of, wonder if the Pod filter was being sucked closed at those power levels? Hmmm...
Thursday, August 14, 2008 - 07:45 pm, by: Michael Keen(Spoilt)
even a dirty pod filter ahha.. but remeber this as well, you are comparing you engine to a year ago, and trying to get the same results maybe it a little more worn out since then, have you done many k's since then.. things you must not forget just my 2 cents
Thursday, August 14, 2008 - 08:13 pm, by: Cameron Laufer(Ivboost)
I would also say exhaust manifolds, ask Cihan about Anton's Car when he was up in Brisbane tuning a few months ago, he had a GT30r, It was mounted on an manifold which attached to the factory manifolds (basically a pipe that joined to factory manifolds together with a T3 flange in the middle. It had injectors, fmic, exhaust and so on and for some reason wouldnt pull big power either
Thursday, August 14, 2008 - 08:33 pm, by: Shane McInnes(Soarin_tt)
Yeah its quite safe to say the problem lies with in the exhaust. Its just hard to believe considering the back half of the exhaust is about 15mths old and no more than 25,000kms on it, So i cant see the resonators being stuffed, but we will soon find out.
The pod filter is prob 3mths old and not that dirty.
Micheal your right in what your saying, but you must remember, that i have added bigger turbo centres, bigger cams, bigger FMIC and a Fuel pump. Even if the engine is worn out more it still should make more power.
Thursday, August 14, 2008 - 09:41 pm, by: George Funa(Fun001)
Hi Shane. Would it be worth getting a 3.5 inch cat back single exhaust made up out of mild steel(1 resonator plus 1 rear cannon). Did you try unbolting the exhaust on Tuesday night
Thursday, August 14, 2008 - 09:57 pm, by: Maurice Diggler(Mau_rice)
I don't think so George, I have the exact same exhaust set up until just after the cat, from then I split to 2x2.5" pipes with a resonator / muffler on each side, mine is just the same as his and it isn't a restriction on my car.
Friday, August 15, 2008 - 06:07 am, by: Cameron Laufer(Ivboost)
I had a 3in exhaust consisting of a single muffler and 4 resonators on my 1.5j when it made 340rwkw, I would be looking at your CAT and I also believe you turbo manifolds are causing a large restriction, because your pumping a much larger volume of air into your engine at the same boost pressure, you make more power through out your rev range when your on boost, this is how it works as we all know. Now because of this you have more exhaust gasses you also have to get rid of. You will be generation higher exhaust pressure pre turbo which robs power as well as other damage like higher egt. Think about, the STD manifolds have a outlet of around 40mm, you trying to breath a 400hp+ engine through a dual 1.75in exhaust manifold, don't get me wrong you also need a good exhaust system as well, remember the exhaust system starts at the cylinder head. Some of you problem like here.
Friday, August 15, 2008 - 10:13 am, by: Daniel Clarke(Dieseltrain)
The cat is gutted, so its not an issue, i thought i made that obvious with my last staement
Daniel Clarke wrote on Thursday, August 14, 2008 - 09:05 pm:
COugh..... Hi flow Job now ...... Cough,lol...
Im totally with cameron on the manifolds... Manny did have his ones ported out. 10% increase in ariflow through the manifolds would make a massive difference!
I Wonder how big the actual Exhaust port is on the turbo? Any figures on that Shane?
Friday, August 15, 2008 - 03:58 pm, by: Shane McInnes(Soarin_tt)
Yeah i dunno ••• Daniel? The point is, its the same piping i made 271rwkw from, so the manifold should be able to let me go to 271rwkw + abit more, I agree that the manifold is a restriction though.
Ahwell we will see what happens in the next month or so.
Friday, August 15, 2008 - 04:01 pm, by: Maurice Diggler(Mau_rice)
Off the top of my head I can't think of anyone making more than 260-270rwkw on stock manifolds with any kind of turbos attached, not saying that's the problem but it could be a possibility, I know that Shom / Manny both had modded manifolds, Even Mark from NSW had stock manifolds with custom CT12's and he was making 260rwkw ish at our 2nd last dyno day.
Sunday, August 17, 2008 - 12:28 pm, by: Shane McInnes(Soarin_tt)
Okay the lastest theory that could be the problem
I went to see the people who did the back half of my exhaust (Roccos Performance) and asked their opinion on what could be the restriction.
These guys know their stuff they have a 2JZ RX7 that runs in the high 7s.
Anyway they reckon it could be that my valve springs have had it, once i said i made the same power on 20psi as i did on 16psi, he was confident that was my problem.
He said they had a similar problem with their 2JZ when it had high boost it ran really good for a few meets, then started losing power and found out that it was the valve springs, they had gotten to soft.
Its not to say that defiantly is my problem but that is something for me too think about, considering the car has been on 20psi for over 2 and half years and i have 270,000kms on the engine.
Its a expensive job to fix, and not guranteed to be the problem, so im unsure what ill do at this stage.
James Johnson DieHard Victoria 92 TT , and 93 TT Manual
Wednesday, August 20, 2008 - 06:16 am, by: James Johnson(Jamesy)
wouldn't surprise me if the problem was something like that. the engines are getting pretty old and we are trying to squeeze about double the stock output
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