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Twin turbo when do they kick in???


pl4tnm
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Galant VR-4 org Post #: 973629 posted 03/01/11 09:34 PM     Remind Me!  Send Private Message   Edit Post      
sorry im really new to this. just bought a vr4 1997 galant TT and wondring if anyone knows wat rpm do the turbos kick in??

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turbowop
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Galant VR-4 org Post #: 973631 posted 03/01/11 09:52 PM     Remind Me!  Send Private Message   Edit Post      
eleventy



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DR1665
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Galant VR-4 org Post #: 973634 posted 03/01/11 09:59 PM     Remind Me!  Send Private Message   Edit Post      
Um, I'm thinking you'd know when the turbos kick in by the boost gauge reporting 1psi or more.

You might want to check out ClubVR4.com, my Kiwi friend. 99% of the people here have the earlier VR4s. You know, the ones that look like Nissan Maximas with the four cylinders. :P



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pl4tnm
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Galant VR-4 org Post #: 973635 posted 03/01/11 10:03 PM     Remind Me!  Send Private Message   Edit Post      
eleventy??? i feel the turbo kick in around 3 or 3.5'rpm? but this is twin turbo so im guessing there a problem somewea. either the primary or secondary turbo is not working.

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pl4tnm
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Galant VR-4 org Post #: 973636 posted 03/01/11 10:05 PM     Remind Me!  Send Private Message   Edit Post      
sweet thanks, will check it out.

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fuel
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Galant VR-4 org Post #: 973686 posted 03/02/11 03:42 AM     Remind Me!  Send Private Message   Edit Post      
the turbos aren't sequential (ie not primary and secondary), there are two turbos working in parallel - one turbo per bank of three cylinders given it's a V6 engine. The turbos are quite small, they are twin TD025 which is about 2/3rds the size of a TD04 on a 1.8L Lancer GSR Turbo. They should spool up just about instaneous from approx 2000rpm but will run out of puff towards 6000-6500rpm.



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Galant VR-4 org Post #: 973690 posted 03/02/11 07:37 AM     Remind Me!  Send Private Message   Edit Post      
Correct!

Mine were off and running hard by 2500 rpms. Power does drop off in the upper rev range but I never noticed it as low as 6500 rpms, my recollection could be hazy though as I got my turbos upgraded. I'm also not convinced that power falling off at higher rpms is really an issue unless you are going so fast you are battling serious drag and or going uphill. After you overcome inertia it takes less power to keep you moving. As a rule of thumb if the rpms are rising steadily and you don't have any slippage (clutch on it's way out or spinning tyres etc) you should still be accelerating fine. I guess more power just means you accelerate faster but unless you have built an engine capable of very high rpms, that rev limiter comes up very quick!



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blacksheep
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Galant VR-4 org Post #: 973704 posted 03/02/11 09:44 AM     Remind Me!  Send Private Message   Edit Post      
Quoting turbowop:

eleventy







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belize1334
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Galant VR-4 org Post #: 973711 posted 03/02/11 10:24 AM     Remind Me!  Send Private Message   Edit Post      
You made my morning wop...



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Axeboy
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Galant VR-4 org Post #: 973803 posted 03/02/11 04:42 PM     Remind Me!  Send Private Message   Edit Post   
This might help. This was tuned a bit, but shows the general torque curve for my old Legnum. Peak boost was around 2250.





Edited by Axeboy (03/02/11 04:43 PM)

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