forged 2.5 or 2.1 stroker??
15 July 2012, 09:53 PM
#1
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forged 2.5 or 2.1 stroker??
which one should i build?i have a p1 with standard heads,sc46 billet,syvecs,6 speeed etc.i have a 2.0 forged at the moment but im planning a bit of an engine project over the winter.which would you build?p.s. i have a closed deck block if i got the 2.1 route 
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15 July 2012, 10:46 PM
#10
Well Depends what you want really. Fast road car. or Fast Track / Strip car.
If u want something quick on the Road, go with the 2.5
If it's track or Drag then 2.1
Better still go for the best of Both worlds and go 2.35
that being Said with a Blank Cheque you could make a 2.5 Rev like a 2.1
I jumped to 2.5 it was Awesome. I am now dropping to 2.1. If i could afford the 2.35 i would go that route.
If u want something quick on the Road, go with the 2.5
If it's track or Drag then 2.1
Better still go for the best of Both worlds and go 2.35
that being Said with a Blank Cheque you could make a 2.5 Rev like a 2.1
I jumped to 2.5 it was Awesome. I am now dropping to 2.1. If i could afford the 2.35 i would go that route.
15 July 2012, 11:28 PM
#12
From my little knowledge of the subject ive always been under the impression that even forged the recommend power is still only around 450-500 of each but there are 2.1's running some silly powers. I think if you have deep pockets then the 2.5 can produce some huge torque levels.
I would be interested to know and see some graphs of the same supporting mods run on a 2.1 against a 2.5 to see which would hit boost sooner, angle of the curves, which run out of steam etc
Any tuners out there with a couple of graphs of similar supporting mods but same turbo?
I would be interested to know and see some graphs of the same supporting mods run on a 2.1 against a 2.5 to see which would hit boost sooner, angle of the curves, which run out of steam etc
Any tuners out there with a couple of graphs of similar supporting mods but same turbo?
16 July 2012, 06:16 AM
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I'm a fan of the 2.5 but for a fast road car, 2.1s rev better and higher plus are stronger therefore can take more abuse, especially on a cdb.
Here's my dyno on a forged 2.5 with an md321x still on std ported headers.
Here's my dyno on a forged 2.5 with an md321x still on std ported headers.
16 July 2012, 07:45 AM
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16 July 2012, 12:18 PM
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The 5 speed WILL fail at some point, but at least they are cheap to buy/rebuild.
Leeroy, i'd suggest simply drop in pistons matched to the bores. This way, it's a cheap build and also very easy diy build.
Thing is, how do you drive your car? Assess this and work out what suits your driving style.
Leeroy, i'd suggest simply drop in pistons matched to the bores. This way, it's a cheap build and also very easy diy build.
Thing is, how do you drive your car? Assess this and work out what suits your driving style.
Last edited by drb5; 16 July 2012 at 12:19 PM.
16 July 2012, 02:05 PM
#21
So you prefer the 2.5 for a road car and the 2.1 for track?
16 July 2012, 02:11 PM
#22
None of that is meant to be negative more constructive.
16 July 2012, 03:21 PM
#23
Ive got an SC46 on an SCD 2.5 with forged pistons but standard sti rods and crank.... tis a lovely drive on the road but have had to have it conservatively mapped to protect against cracking a liner. (440/410)
If i had to do things again id spend that little bit extra and get the block pinned to stop the liners cracking. That with fully forged internals and the cossie 260kpi studs and youd have a very capable road and track engine.
Ive heard bloody good things about the 2.1 on track, but on the road, theres no replacement for displacement and its associated low down grunt.
If i had to do things again id spend that little bit extra and get the block pinned to stop the liners cracking. That with fully forged internals and the cossie 260kpi studs and youd have a very capable road and track engine.
Ive heard bloody good things about the 2.1 on track, but on the road, theres no replacement for displacement and its associated low down grunt.
17 July 2012, 07:16 PM
#26
Hmmmmm
...i think a close friend of yours has already said exactly what Alan has also said matey,a 2.1 stroked block is pound for pound big power king in his opinion and hes 100% certain its the way he is going after much ground work and research into the subject.
Money no object it would be a 2.35,but it is an object so its a done deal for him.
And its goodnight from me,and its goodnight from him.
