Hi guys, within the next few months (definitely before the end of the year), I will be getting my engine rebuilt by Eric (DRZ400Y) at A2zed, As some of you might know from my threads, I'm a torque junkie! It will be a forged rebuild - my question is what are the torqueyest turbo's I can get for the street, I want something that spools up as early as possible & really pushes you hard back in your seat when they kick in. Is there anything that will come on strong from about say 2,500 to 5,500? That's my daily drving rev range, though the engine will rarely see 6,000rpm & spend most of its life just below 5000rpm Thanks in advance
what hp you looking to run?? GT28rs are popular, im running GT600Rs http://www.aus300zx.com/forum/showthread.php?t=302223 and should be pretty responsive.. alot of other factors to consider too like i/c piping and lag, exhaust etc anythin you can do to help reduce lag is gonna see you spoolin earlier and therfore more power earlier in the rev range
seconded. He's building the engine, he'll know what work he's doing and what turbo will suit his build best. I'd be going straight to Eric with this question.
Dude, to be honest, thats right in the slot of stock turbos! Depends on how much boost you plan to give it really. If you want to limit boost you could use something smaller, GT17 or something babylike and it will hit like a hammer from almost idle. L8r E
Thirded. Be guided by Erik's input first. It should be a total package option handled by one person responsible for best results. Sure, after he has identified the best turbos, then go price shopping if required.
How about keeping the stock turbos along with a small mechanical supercharger to ensure early boost kick-in and help bump torque throught the whole rev-range? Hehe, that would be freakin awesome but have fun finding the space for it eh.
Haha! thanks Eric will go shopping for these GT600's - But out of curiosity guys, what about rebuilding the stockies? I have a feeling they will also spool up the quickest, but I would be losing top end which I'm not concerned about As Niall stated stock auto turbo's - which I already have Would this be better for aggressive bottom & mid range power or the GT600's & what about the GT28R's which I've heard so much about Thanking you
even with stock housings and high flowed cores, you're still going to increase lag. You cannot get away from that. I've personally got stock housings with some monster cores in them - and while the power is pretty big out of them, there's still definately extra lag there over stock. So, i'd trust and go with what Eric suggests for your build. He's the man. :zlove:
How about keeping stock turbos and changing the front impeller to the T3 more efficient (meaning different design + much larger) type if impeller. Leave the rear exhaust impeller the same as stock. This means that for the same amount of work the larger impeller will flow more air compared to the T2 (or std) type of impeller. This should result in more turbo efficiency for the same amount of work and ultimately should result in less Lag with the bonus of better mid/top end power. This is the setup I have on my car using the Auto Turbos + ugraded side intercoolers & stock boost and doesn't feel laggy. I believe since the upgrade the stock boost has gone out the window because on WOT/under load the needle goes almost to the extreme RHS. This is definately not STD boost. I have a moded chip to compensate though. But no boost jets or EBC's just the std solenoid boost controllers from factory. Not sure but is this what people refer to as the GT28RS???? Also CUSTOMTT if you use the standard turbos (meaning sleeve bearing - non roller bearing) put on a step seal in each turbo. This replaces the crappy seal in the exhaust housing. The step seal will ensure your turbos outlast your engine unless you starv them of oil then it's a different story. Peter
GT28RS has larger exhaust wheels aswell. You have a bit of a hybrid by the sounds of things. But glad that it works well for you. Do you have a dyno graph for that setup? am curious to see how that goes.
Yes, Benny they're a hybrid and seem to work very well indeed. I don't have a dyno graph. The tune at the moment is non custom. I definately have this on the list of things to do to bring the whole system together but have this feeling of unsureness as to who to trust to tune it and the cost involved. The computer has been modified with the rom adaptor which you can take the rom in/out just by lifting it off. But not sure who to get to do this and how to burn the new tune on to the new rom. Bit stuck in this dept. Back to the turbos... All that has been done is machine the front housing to take the T28 wheel. The visual aspect of the upgrade is huge. I believe anyone can benefit from this upgrade but I also think that upgraded intercoolers will provide that additional cooling since the compressed air will now be even hotter due to the larger wheel and stock 0.48 auto housing. But ideally, the manual turbos would be perfect for this. I did it on the cheap since my car is AUTO and these would provide all the power I will ever need. Peter
Great idea! I might look at this upgrade for my track car. I dont have the A/C compressor etc in this car so have the room for the supercharger, just need to work out a route for the air to the drivers side turbo.
From other SuperTurbo engines I have seen done there is a lot of fart arsing around getting the transitional point right with shutting air off from the blower and going solely to the turbos. I had a good article somewhere on how a guy did it with a 13B rotary, I'll see if I can dig it up. It did give some very good results though.
Its a real pain in the arse actually! Best off turbo OVER supercharger. Set your supercharger boost level to what you want for grunt right from idle say 10 psi, and then dial in the turbo pressure over that for level of foolishness at hight throttle. Place the throttle body BETWEEN the turbos and supercharger or ideally, on the snout of each turbo with a suitably modified front seal for pulling thru. Actually, only one decent turbo is necessary but two for street cred!!! This setup will result in a tyre frying monster at ANY rpm and insanity when the right foot gets busy enough to spool the turbo/s. A M8 has a Mk2 Esky like this. Pinto 2.3 Ltr. Around 700 HP atw. Its total madness. 12psi @ 1000rpm. Touch the throttle at any revs and it simply fries tyres. Why? because he can!!!! L8r E
