single turbo

[escortman]

thing is the people who you have seen use them do they have the exact same trim an ar coz the workshop thats doing this for me have one on their r33 gtr an it hits boost at around 4500rpm so realistically it should be the same or earlier on a 3liter...........what rpm do the people you know hit boost at???

Should spool better on a 2JZGTE yes - however hitting boost at 4500rpm is a really bad term, does that mean ANY boost or full boost? My car hits boost at 2000rpm but doesn't have full boost until just over 3500rpm.

I just had a chat with the guy, he has an RB30DET VL Commodore and he's actually running an XSPower Super T70 (.84a/r hot side) not a Masterpower T70 - the Masterpower unit is bound to be better performing. For interests sake, he reckons the XSPower Super T70 doesn't make full boost until over 5000rpm. My bad, it might not be as bad as I first thought - I just remembered it being a T70 he got off Trademe


Still a really big turbo, but so long as you don't get a lean out and blow it up on the stock fuel system and ECU - when you upgrade all that your car will be capable of some pretty serious power!

dude at work has a rb30det in his drift car and have masterpower t70 it makes full boost at 3000rpm

[Lith]

dude at work has a rb30det in his drift car and have masterpower t70 it makes full boost at 3000rpm

Pics or it didn't happen

[escortman]

haha hes sam groombridge frm drift corp with the r32 4dr o it may have been 3500 i know it was under 4000

another mate has rb30det with t3t4 on it and hits full boost at aroound 2500

[Lith]

Haha here is a car which apparently gets full boost at 4000rpm yet the tell tale sign of boost building (torque curve going real steep) only just really starts at 4000rpm and finishes (full boost) just before 5000rpm. It may not sound like much but look at how short of torque you'd be at 4000rpm compared to 5000rpm if you had counted on the reported spool:

http://forums.toyspeed.org.nz/viewtopic.php?t=51671&postdays=0&postorder=asc&start=15


Its just an example, not a dig btw - its very very common as people don't like to call their own car laggy or whatever, its usual for talking up and it doesn't really mean too much but its really worth looking at dyno plots or if you can go in another car with a similar setup to gauge whether its really going to work for you. I reckon the T70 should be ok on a 3litre, nothing like a decent big motor which has torque anyway haha - though it will be interesting to see how it is to launch with the stock auto.

Point of the rant is for other who are reading it, I reckon people should think a bit harder when choosing a turbo as it can really define the way your whole car behaves and there are a lot of throwaway comments made which can paint an inaccurate picture of what to expect.

[avinesh]

thing is the people who you have seen use them do they have the exact same trim an ar coz the workshop thats doing this for me have one on their r33 gtr an it hits boost at around 4500rpm so realistically it should be the same or earlier on a 3liter...........what rpm do the people you know hit boost at???

Should spool better on a 2JZGTE yes - however hitting boost at 4500rpm is a really bad term, does that mean ANY boost or full boost? My car hits boost at 2000rpm but doesn't have full boost until just over 3500rpm.

I just had a chat with the guy, he has an RB30DET VL Commodore and he's actually running an XSPower Super T70 (.84a/r hot side) not a Masterpower T70 - the Masterpower unit is bound to be better performing. For interests sake, he reckons the XSPower Super T70 doesn't make full boost until over 5000rpm. My bad, it might not be as bad as I first thought - I just remembered it being a T70 he got off Trademe

Still a really big turbo, but so long as you don't get a lean out and blow it up on the stock fuel system and ECU - when you upgrade all that your car will be capable of some pretty serious power!

you know you can actually lean out an blow a motor on stock turbos...has happend........just sayin im not goin to run high boost lol you guys talk like im goin to run high boost on stock fuel an thats it an thats how it will go.....im not goin to run high boost my aim is not to blow the motor up by running crazy boost on stock fuel only thing worrying me is that my tuner thinks its good to run 12.5:1 af ratio an im not really keen for that....

[avinesh]

ok just in the process of getting some 550cc u.s injectors, only problem is how do i wire them in to run at high impedence.......anyone has any recommended place i can take it to get injectors installed with the appropriate resistors thanks....

[2jayzgte]

Turbo choice is all dependent on what your using your car for.I would assume with the choice of a T-70 price is a factor which is cool but running this turbo at 10 psi in my mind defeats the purpose of going single.Really to do a single conversion properly you really need to have all the supporting mods in place to see the full potiential of the upgrade.

Now you will loose alot of your power-band with this turbo because of the fact that turbo will not hit full boost till about 4-4500 rpm so you will loose your response off the bottom sure you will see more power up top but for all round driveability the car will be no better.

I still run the Factory U.S/U.K setup and have just added a HKS F-CON V PRO to the mix and it has lifted performance to another level again I saw gain all the way through the power band saw as much as 320 KW on the Speedtech Dyna-pack and have absolutely crushed my fastest lap around Manfeild on the weekend without losing any reliability and I still have the turbo's in factory sequiential mode.

I think its a popular perception that the factory turbo's are any good but I beg to differ on this point with my experience over the years they are strong they give your car the all round driveability day to day and if you do the right mods you'll have a car quite a bit quicker than most.

[avinesh]

Turbo choice is all dependent on what your using your car for.I would assume with the choice of a T-70 price is a factor which is cool but running this turbo at 10 psi in my mind defeats the purpose of going single.

10psi or so till i get supporting mods

[MAGN1T]

Most people don't know the difference between lag and boost threshold.

Lag is to do with inertia, nothing to do with how many RPMs it gives full boost at.

You know you've got lag when you floor it in 1st gear and get no boost.

That's why twins are always better on bigger motors unless you want something that's only good on the dragstrip.

Steve

[Lith]

Lag is to do with inertia, nothing to do with how many RPMs it gives full boost at.

You know you've got lag when you floor it in 1st gear and get no boost.

That's why twins are always better on bigger motors unless you want something that's only good on the dragstrip.

How could twins have less inertia when they have more rotating mass and greater friction (two sets of everything)? Twins work awesome on a 6cylinder because its far easier to get the exhaust collected up into a single collector in a small space from 3 cylinders than 6 - the pulses end up nicely spaced apart and bugger all energy is lost from the valve to the turbine wheel. When people go to high mount twins versus a big single equivalent the advantage is lost.

I agree lag and threshold are different but realistically you get far more of an impression as to how well the turbo can build up speed from a dyno plot than you can from someone saying "My car makes 1bar by 3000rpm, honest".

At the end of the day the dyno gives the turbo x amount of seconds to build up x amount of boost each time, every time - it brings lag and threshold into it imho. If you want to find out how much (if any) boost can be built in 1st gear, you just run the dyno with a really fast ramp rate - if you want to find the best boost threshold the turbo/engine combination can do, run it through really slowly.

[avinesh]

so does anyone know where i can get u.s spec injectors fitted properly which will allow me to run over 300wkw safetly

[Lith]

You'll need a different ECU to deal with the higher flow, wouldn't you?

[avinesh]

You'll need a different ECU to deal with the higher flow, wouldn't you?

naa the supra ecu copes with the 550cc injectors fine (guy in supra forum has done it runs rich though) can tune a little with fpr......also have a mate running 550cc after market injectors tuned with a fpr making around 320rwkw

[avinesh]

anyone??????

[2jayzgte]

anyone??????

When I went to the 550s I had a dirty great flat spot in the mid-range and the fuel was rich all over the show so a FPR cured some of the problem but I reckon the factory ecu only compensated for about 15-20% of the extra fuelling going from 430s to 550s is a 30% increase hence the richness all over the rev range.

I had this problem there are a few ways around it a FPR will sought the fuel pressure but after that you'll need a piggy back ECU or a SAFC now I would recommend the ECU but doing the SAFC is alot cheaper.But I think in the long run the Piggy-back ecu is the way to go.