Thursday, August 14, 2008 - 09:56 am, by: Steve Zourkas(Zork)
I had a dyno run and only pulled 157 rwkw. Its a little down on what it prob should be. Its got stock boost, any mods are twin dumps, 3 inch exhaust. I have been told a couple of different things by different mechanics. I had a compression test don to find all 6 cyl between 130-140 dry test. He said it is a little low, but motor seems to be in good nick, he claims one of the turbos are stufed, considering it is gutless until about 4000rpm. The guy that dynoed said there is no way one of the turbo's is stuffed as it would not reach the boost levels it does.
My question is, can one turbo still boost up to 13psi at the manifold, but just not as quick as if both were working. I know some of you will say, just take them off and look, but im trying to avoid that. haha. unless they are stuffed.
Monday, August 18, 2008 - 05:05 pm, by: Rob Rojo(Rob_tt)
Its possible that it has a blown turbo but that power figure is still pretty reasonable and I think it would be too high to achieve with only one working turbo. Are the either or the turbo's excessively noisy or smokey? What boost was the car running? (If you don't have a gauge it should say on the dyno printout, Stock boost can change with any exhaust or intake mods) How old is the Cat convertor? (could possibly be blocked) 157kw's is not that bad but it could also be a bit higher. The fact that you have lack of power down low could be due to the fact that you have aftermarket dumps fitted that could cause more lag & if you have only changed the exhaust side of things you may find the intake side is holding everything up. Are you still running stock intercooler and airbox?
Saturday, August 23, 2008 - 05:00 pm, by: Rob Rojo(Rob_tt)
157 Is not a bad result for a stock car but I think there is a lot of room for improvement as mentioned it would be worth having a look at the printout. My car made 217rwkw with just a 3" single cat back system (stock dumps & cat) ,FMIC, 14psi & pod filter. It also had an emanage blue with no settings loaded so was effectively running ECU as Stock.
Ben Socratous Goo Roo SA I am the fibreglass/kevlar/carbonfibre king!
Sunday, August 24, 2008 - 08:51 am, by: Ben Socratous(Socrates)
All depends on the dyno and the motor mate. Keep in mind that most run of the mill 1J's these days are getting around the 15yr old mark (up to 18yr for the '70 supra 1J's). For a car that technically made '206kw' at the fly, 150's at the treads through an auto is a fairly reasonable expectation, especially running the stock '70 series cooler and piping!
Tuesday, August 26, 2008 - 11:59 am, by: Rob Rojo(Rob_tt)
It looks like it is making good power early then just dropping off. It is running rich across the entire rev range. You need to find out why its loosing power up top. Get that sorted and you should get some way better results.
Tuesday, August 26, 2008 - 10:24 pm, by: Rob Rojo(Rob_tt)
If it is the ECU it won't be that expensive compared to the turbos anyway (around $100 for a 2nd hand unit), you might want to reset the ecu if you haven't already done so and see if that makes any difference
Thursday, September 04, 2008 - 08:17 am, by: Braden Murdoch(Ribfeast)
That compression is pretty low, mine is around 170ish, and some 1JZs are around 180+ across most cylinders, this may be part of your problem. Also check if you cat is clogged, and wind boost up to 14-15psi.
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