HKS turbo's
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Do you mean specific turbos?
Because i know that all HKS turbos could be fitted to an r34 gt-r.
Because i know that all HKS turbos could be fitted to an r34 gt-r.
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Yeah all the 25 series are straight blot ons to the gt-r manifold.
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1,193 Posts
2540's
Is there a big difference between 2530's and 2540's???
What power can 2540's take???
Luke (whose found a 32 downunder with 2540's on)
P.S. Cheers Paul
Is there a big difference between 2530's and 2540's???
What power can 2540's take???
Luke (whose found a 32 downunder with 2540's on)
P.S. Cheers Paul
Copied from SDU:
quote:
Originally posted by adam
whats so bad about 2540s?
Do you have 2540's ?
Have you ever driven a car with 2530's and then with 2540's ? I have.
The problem with the 2540's is explained well in last months Sport Compact Car under performance dictionary. I will try and get a copy of it put up somewhere.
What it boils down to is the compressor wheel is too large for the turbine/exhaust wheel. What this does is make the turbo much more inefficient.
Or in other words it spools up 1500 rpms later and makes no more power at the top.
You have less useable power. The same peak power as the 30's - which are good - but less useable power as they spool up later...
Talk to turbo engineers. Everyone teaches the 2540 as a classic example of what not to do with a turbo.
With the 2530's - 2540's on the dyno . Our car made almost exactly the same power.
quote:
Originally posted by adam
whats so bad about 2540s?
Do you have 2540's ?
Have you ever driven a car with 2530's and then with 2540's ? I have.
The problem with the 2540's is explained well in last months Sport Compact Car under performance dictionary. I will try and get a copy of it put up somewhere.
What it boils down to is the compressor wheel is too large for the turbine/exhaust wheel. What this does is make the turbo much more inefficient.
Or in other words it spools up 1500 rpms later and makes no more power at the top.
You have less useable power. The same peak power as the 30's - which are good - but less useable power as they spool up later...
Talk to turbo engineers. Everyone teaches the 2540 as a classic example of what not to do with a turbo.
With the 2530's - 2540's on the dyno . Our car made almost exactly the same power.
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1,193 Posts
hmmmmm...
Cheers for that, not quite what I was expecting but it's good to know.
Luke
Cheers for that, not quite what I was expecting but it's good to know.
Luke
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1,193 Posts
Yup - Sean Morris has got it in for the 2540's even though tuners such as Top Secret, Auto Select etc use them. Never driven anything with 2530's so I can't compare. Boost comes in fairly late but when I get my rebuild done I'll see what cams are in there. From what I understand Ged used 272 on inlet and exhaust with his 2540's and his boost came in earlier than mine.
At the end of the day, the power is there so I ain't gonna complain.
Talat.
At the end of the day, the power is there so I ain't gonna complain.
Talat.
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46 Posts
I think the A/R housing size is larger on the 2540's compared to the 2530's.
Ah yes, Sean Morris..........Talat said:
I am a frequent passenger in an R32GTR with 2540R's on it. It has rather large cams and a bit of headwork done. Boost comes in at about 5psi at 3000rpm, and by about 5000-5500rpm, she is near 25+psi, depending on what he runs...... anything from 22psi to 35psi, and it is only used on the street.
http://nzupi.co.nz/_detail/_ourcars/raym.htm
Lets just say, I haven't been in many cars that do 100-200km/h quicker than 0-100km/h, and this does it easy.
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Atleast the 2540's come onto boost faster than twin 3240's wound up to 2.3 bar......then hold on
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