Originally posted by varg
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M42 turbo fact thread
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Contemplating a turbo upgrade in the very near future. I'm trying to decide between the gt2560r vs gt2860rs. Both spool pretty quick, the 2560 about 500 rpm quicker, but the 2860 has a better flow at the top end. I wont be running more than 12psi and still on stock motor (haven't even started on the new engine build).
Thoughts on these two?Last edited by jntar; 10-12-2014, 11:19 AM.
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Originally posted by jntar View PostContemplating a turbo upgrade in the very near future. I'm trying to decide between the gt2560r vs gt2560rs. Both spool pretty quick, the 2560 about 500 rpm quicker, but the 2860 has a better flow at the top end. I wont be running more than 12psi and still on stock motor (haven't even started on the new engine build).
Thoughts on these two?
I'm trying to decide between GT2554 and GT2560.
My thinking is that I'm trying to supplement the powerband, not create it. So the 2560 seems like it should supplement the M42 powerband pretty well, and shouldn't run out of puff too much at the top end.
For me at least, the 2860 would be a little big I think.
Good part about those turbos is that flange size is the same for all T2s. So it's pretty easy to change between them.
What sort of power are you after?
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Originally posted by econti View PostI suppose it depends what you want it for.
I'm trying to decide between GT2554 and GT2560.
My thinking is that I'm trying to supplement the powerband, not create it. So the 2560 seems like it should supplement the M42 powerband pretty well, and shouldn't run out of puff too much at the top end.
For me at least, the 2860 would be a little big I think.
Good part about those turbos is that flange size is the same for all T2s. So it's pretty easy to change between them.
What sort of power are you after?Last edited by jntar; 10-12-2014, 10:35 AM.
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^^ This is the same turbo I am trying to get from my friend. It's apparently pretty awesome on the sr20's. I know T25 with an hks wastegate (about 1 bar of boost) is somewhere around 200-250 I think for my friends 240sx. I think it'll be a good buy!
How/ where are you guys running coolant lines to the turbo? I am doing the mess under the intake stuff as well so can I get it from coolant pipe (the teal colored line in the picture below) and then return it to the cylinder head (also the teal line pictured below).
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So I decided against the S52 swap, and am going to keep the M42 and go turbo! Looking to get some advice/predictions on my build. I have read several build threads and am meeting with a local engine builder hopefully this week, because if I am really going to do this the Engineer in me has to do it as close to correct the first time as I can. Thoughts on the following setup for reliability/hp?
Compression goal: 8.5:1
Forged Pistons
Performance Valves and Springs
Polished and Balanced Stock Crank and Rods
Turbo Cam
Ported and Polished Head
ARP Hardware
MLS Gasket
Turbonetics Ball Bearing T3/T4 5 Bolt Turbine .63 a/r (High teens psi?)
SDS Stand Alone (Already Purchased)
Stay tuned for a build thread!The Lineup in order of appearance:
91 535i
91 318is 5 Lug/E46M3 Brakes
91 325is w/ S52
88 Vert Plastic Bumper Swap
88 M3 ;D
91 325ix 5 speed
89 Vert Royalblau Metallic
73 2002
1986 325es --> is swap Rallycross Car!!
1995 Chevy G30 Tow Rig... *I SOLD A CAR!!*
1993 525i Granitsilber Metallic Touring
Need a 91 M5 bad but wife would shoot me...twice
*UPDATE: got a 93 M5 and still alive
1972 Jeep Wagoneer
1975 2002 five speed
Check out:
Elhartspeedshop.com
sigpic
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Originally posted by elcoy View PostSo I decided against the S52 swap, and am going to keep the M42 and go turbo! Looking to get some advice/predictions on my build. I have read several build threads and am meeting with a local engine builder hopefully this week, because if I am really going to do this the Engineer in me has to do it as close to correct the first time as I can. Thoughts on the following setup for reliability/hp?
Compression goal: 8.5:1
Forged Pistons
Performance Valves and Springs
Polished and Balanced Stock Crank and Rods
Turbo Cam
Ported and Polished Head
ARP Hardware
MLS Gasket
Turbonetics Ball Bearing T3/T4 5 Bolt Turbine .63 a/r (High teens psi?)
SDS Stand Alone (Already Purchased)
Stay tuned for a build thread!
:)
Sounds like a promising build. You should give MM a call about a head. Might as well go with one of theirs and rev to 7700.Last edited by MF DOOM; 11-08-2014, 12:23 PM.
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Originally posted by RedReplicant View PostIs anyone still making a Megasquirt PNP unit for the M42?
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Originally posted by wazzu70 View PostWhats your power goal? 9:1 compression would probably be better IMO.
Why such an ancient turbo choice? Are you getting it used for cheap??
I guess I didn't know that was an ancient turbo, what would be a better choice?The Lineup in order of appearance:
91 535i
91 318is 5 Lug/E46M3 Brakes
91 325is w/ S52
88 Vert Plastic Bumper Swap
88 M3 ;D
91 325ix 5 speed
89 Vert Royalblau Metallic
73 2002
1986 325es --> is swap Rallycross Car!!
1995 Chevy G30 Tow Rig... *I SOLD A CAR!!*
1993 525i Granitsilber Metallic Touring
Need a 91 M5 bad but wife would shoot me...twice
*UPDATE: got a 93 M5 and still alive
1972 Jeep Wagoneer
1975 2002 five speed
Check out:
Elhartspeedshop.com
sigpic
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Originally posted by jntar View PostYes And no. There is a company that sells an unauthorized version. I own one. However, they are not good. Mine is near impossible to tune and I wish I had built my own.91 318is - Gone
16 VW GTI
07 Aprilia Tuono
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Originally posted by RedReplicant View PostThat's too bad. I guess the best option is to buy a used harness and make my own MS harness from it.
Turbo M42 Build Thread :Here
Ig:ryno_pzk
I like the tuna here.
Originally posted by lamboButtchug. The official poster child of r3v.
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Originally posted by Dj Buttchug View PostTheres really no need to modify or make your own harness. You use the OEM 88 pin harness when you build a PNP unit.Last edited by RedReplicant; 11-15-2014, 11:03 PM.91 318is - Gone
16 VW GTI
07 Aprilia Tuono
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I just picked up a 1991 318i and I'm going to mod the motor somehow.
So the choice i think for me is a typical M50/M52 twincam, or turbo the M42
So you that drive you M42 turbo all the time, how is it? other than more horsepower, how's living with it everyday? This will become a daily driver for me.“There is nothing government can give you that it hasn’t taken from you in the first place”
Sir Winston Churchill
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