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Re: GT28R vs Hybrid turbo.....
#55694
17/03/2006 05:52
17/03/2006 05:52
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Anonymous
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Anonymous
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which is better then a `superspool` or GT28R?
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Re: GT28R vs Hybrid turbo.....
#55695
17/03/2006 05:57
17/03/2006 05:57
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Joined: Dec 2005
Posts: 19,939
North wales
pinin_prestatyn
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Forum veteran
Joined: Dec 2005
Posts: 19,939
North wales
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Arguably the "better" turbo would be the GT28R. Although the superspool would come on boost really quite low in the rev range, it would struggle to supply the same boost at the top end as the GT28, which would come into it's own. However the Superspool would be a nice drive as there's minimal lag. The GT28 isn't that bad at spooling as the roller bearing helps it spool up, but wouldn't be as quick off the mark as the superspool. So if you are chasing big BHP figures or a meaty top end go for the GT28R/RS, if you aren't that fussed about massive BHP gains and want a nice easygoing turbo that still outperforms the std T28, go for the Superspool. 
 Coopless!
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Re: GT28R vs Hybrid turbo.....
#55696
17/03/2006 06:36
17/03/2006 06:36
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Anonymous
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Anonymous
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Gt28r, Gt28rs, Gt287rs...... anything with GT by garrett is roller bearing i think but not sure what KKK and such like are like.
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Re: GT28R vs Hybrid turbo.....
#55697
17/03/2006 13:39
17/03/2006 13:39
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Anonymous
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Anonymous
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Quote:
but not sure what KKK and such like are like.
Fundamentally unsound from what I've seen on films. Strange hooded outfits as well.
I'll get my coat 
Great to see Nigel and Cosmo's posts about the 28R, as mine is currently sat in the cupboard waiting for the DP to be made up. I especially like the smoother transition onto boost and don't mind sacrifing a bit of spool-up bite if it gives the clutch an easier life
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Re: GT28R vs Hybrid turbo.....
#55698
17/03/2006 17:10
17/03/2006 17:10
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Anonymous
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Anonymous
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Quote:
Great to see Nigel and Cosmo's posts about the 28R, as mine is currently sat in the cupboard waiting for the DP to be made up. I especially like the smoother transition onto boost and don't mind sacrifing a bit of spool-up bite if it gives the clutch an easier life
Don't quite understand this  I have a superspool turbo, my maximum torque is at 5krpm, I run a blitz boost controller with the gain set low at 10 but still get 1.2bar at 2600rpm, (although it does not pull hard till 3krpm). There is no 'on off' feel to the turbo, it builds up to its torque peak at 5krp and bhp peak at 6krpm. Car feels very smooth pulling nicely through the rev range. This is down to the boost controller settings rather than the turbo and I'm pretty sure its not hard on my clutch. Surely the GT28R/RS will be harder on a clutch, (it produces more power and Torque )
Chris
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Re: GT28R vs Hybrid turbo.....
#55699
17/03/2006 17:16
17/03/2006 17:16
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Anonymous
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Anonymous
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Couple of things, from what I'm led to believe (if this is BS, let me know ): 1. The boost controller will allow you to tailor how the boost is ramped up. A PRV is a much more on/off boost delivery, introducing a fat thump of torque for the clutch to cope with. 2. The 28R / RS, due to their slower spoolup, have a smoother transition from off-boost to on-boost, meaning that the clutch has time to transfer the torque in the general direction of the tyres Once it's hooked up, I imagine the higher power / torque of these units, to a certain degree, is less of a problem than a spiky delivery. As I've probably said a few times, my car is overboosting badly (knackered actuator) and with the FMIC and straight induction, the spool up on the turbo is very rapid. The boost comes in with a real thump, makes me wince for the drivetrain.
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Re: GT28R vs Hybrid turbo.....
#55700
17/03/2006 17:22
17/03/2006 17:22
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Anonymous
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Anonymous
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I also run a PBV and not a PRV which helps much in the same way allowing a much more gentle boost curve which is good and i now get spin on base boost in this weather in 3rd  loving the old boosty boosty lol
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Re: GT28R vs Hybrid turbo.....
#55701
17/03/2006 17:45
17/03/2006 17:45
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Anonymous
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Anonymous
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Quote:
Quote:
Great to see Nigel and Cosmo's posts about the 28R, as mine is currently sat in the cupboard waiting for the DP to be made up. I especially like the smoother transition onto boost and don't mind sacrifing a bit of spool-up bite if it gives the clutch an easier life
Don't quite understand this I have a superspool turbo, my maximum torque is at 5krpm, I run a blitz boost controller with the gain set low at 10 but still get 1.2bar at 2600rpm, (although it does not pull hard till 3krpm). There is no 'on off' feel to the turbo, it builds up to its torque peak at 5krp and bhp peak at 6krpm. Car feels very smooth pulling nicely through the rev range. This is down to the boost controller settings rather than the turbo and I'm pretty sure its not hard on my clutch. Surely the GT28R/RS will be harder on a clutch, (it produces more power and Torque )
Chris
Hi Chris. I should point out my previous post was complete conjecture, I dont have any direct experience with either turbo but I was just trying to make sense in my own mind about the relative differences between the two types of turbo. Things get more complicated when you go into boost control and your setup is obviously well sorted to minimise the initial boost level. Change in Torque is what kills clutches, nothing to do with power. The most violent change will occur as the turbo spools from off boost to on. Once the transmission is up and running at the same speed as the engine, then much higher levels of torque can be sustained without detriment to the clutch. This is what I was referring to when I said the GT28R maybe more clutch friendly. Imagine a dinner plate resting on a rotating turntable. If you spin the turntable violently from rest you will break the friction between the plate and the turntable, but its possible if you raise the speed slowly to generate much more power and not lose the friction coupling.
Last edited by cosmograph; 17/03/2006 17:48.
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