Sunday, July 12, 2009 - 05:32 pm, by: Kurt Harrison(Aps12p)
Looking at options for a single turbo or if money provides twin turbo 1uz-fe. Vehicle originally been setup for a supercharge system hvt1900 but believe ill get a quicker quarter mile with a snail or 2.
Been quoted gt35/40r for single and two t28rs for twin turbo from gcg turbos, looking at high compression, low boost for maximum acceleration/torque and quarter mile times, what does everyone think of these setups and is there a problem with turboing the 1uz-fe as it has a high compression?
Sunday, July 12, 2009 - 11:27 pm, by: David Eberhart(Orphan)
Hey Kurt, several forum members have turbo charged 1UZ-FE stock blocks. With higher compression comes less buffer zone and the need for much finer tuning and care when running the car. Some stock 1UZ's have seen 18-20psi of boost on a stock engine and made over 500rwhp but this is very dependant on the tune and the quality of the build. From what i've seen from the supercharger boys there should be no problem running 8-12psi daily as long as its intercooled and tuned well. That should net around the 400-450hp mark depending on turbo etc etc.
I personally think the turbo route is far better but it is far more involved and requires all custom manifolds and piping where as at least with the superchargers its a bit more straight forward and some parts are sold retail. If you have the time money and ability or know someone who can do the pipe work for you I would say go the turbo over the supercharger any day.
Piping is a big issue as the soarer engine bay is quite packed. Depending on where you put the turbo/turbos will determine what items you will have to ditch but at a start basically everything in front of the engine less the radiator. For localised heat issues and plumming issues I think a single turbo is the better drivable and buildable choice. I think the GT35/40R would be perfect for the 1UZ as its already quite a good turbo for the 3L RB builds but the extra capacticy will mean faster spooling and better low rpm response but is still plenty good to make 600hp.
Ideally for a single turbo V engine set up you would mount the turbo right in front of the centre of the engine and run equal length manifolds to the turbo as this tends to net the best high end power. If you want to keep the standard intake manifold I would suggest mounting the single in front of the passenger side of the engine angled towards the battery location which means you can fabricate a nice cold air intake which will help keep your charge temps down. Intercooler piping is simple from there just under the front end to a front mount back through and up to the standard throttle body. This does mean you'd have to run unequal manifolds though, there doesn't seem to be any big negatives of this and technically speaking one side being longer means when your off the throttle there is still at least a bit more exhaust gas to keep the turbo spinning as it is slightly delayed compared to the other manifold. I don't know how this actually affects boost in reality though. If you can't make your own manifolds up an easy but not so great option is to take the stock manifolds off, cut the flanges off and swap them around so they point forward and then just run bends and straight pipe to get it to the turbo. I would seriously consider heat coating or exhaust wrapping them before you put them back on though as there will be a LOT of heat and you have to remember the more heat in the engine bay the more heat that is able to bring up your charge air temp, most intercooler piping is thin stainless steel which is a terrible insulator so a lot of engine heat will pass into the intake charge through the intercooler piping. Not to mention hotter air = less power and all the negatives such as detonation etc.
Single vs twin is a endless topic its all to do with sizing. Some say twins will spool faster but a smaller single will spool faster still. The 1UZ has the capacity to run twins pretty well but I think i'd still go with a nice sized single like the 35/40.
As you were already planning on the HVT1900 I'd guess you'd realised your going to need some larger injectors etc etc. There isn't any real factory ecu tuning ability with the soarer ecu so a standalone would be best. Too bad its not like the majority of nissan ecu's that you can retune with a rom editor and match most aftermarket ECU's as they have all the factory controls and maps.
Hypertune a mob in nsw I believe have a T88 soarer. Link below:
I can't quite see how the plenum set up is plumbed up but it appears to be a dual plenum but only a single turbo so the intake line must split or have a split exit intercooler. You can see the turbo mounted centre front of the engine. I think it could be easier to low mount the turbo for exhaust piping reasons and to keep the weight lower in the engine bay but either way works.
Saturday, August 08, 2009 - 08:47 am, by: Daniel Clarke(Dieseltrain)
There were rumours that Hypertune soarer was on C16 not pump gas . Also that motor didnt last 3 runs at the drags before blowing, so not exactly a true street friendly daily tune .
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