would I benefit swapping from a mdxt321 to a billet sc42?
#1
would I benefit swapping from a mdxt321 to a billet sc42?
would I benefit from the above on my 2005 sti??
im not enjoying the laggyness and I thought the car would make more on this turbo...
i feel that this turbo is more suited for the 2.5.
I think the billet sc42 I will see better results.
craig
im not enjoying the laggyness and I thought the car would make more on this turbo...
i feel that this turbo is more suited for the 2.5.
I think the billet sc42 I will see better results.
craig
#2
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there isn't a reliable answer to that and the only way you will find out for sure is to make the swop but I would question the reliablility of the older SC's billet or none billet, as I know two SC46's close to home were the welds have broken up in the exhaust housing, that's in the last year.
Trev
Trev
#3
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there isn't a reliable answer to that and the only way you will find out for sure is to make the swop but I would question the reliablility of the older SC's billet or none billet, as I know two SC46's close to home were the welds have broken up in the exhaust housing, that's in the last year.
Trev
Trev
#5
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Maybe !
You could also look at the MDX321H as that is more like the SC42 than the T is.
I've tried many, many turbos over the years aimed at specific power levels and it usually comes down to far more than just bolting it on and winding the boost up.
Often they won't hit what the makers of them say they will on run of the mill cars, because the figures posted have been done on something a bit fruitier.
The correct selection of supporting modifications can make a huge difference as can proper fuel and of course proper setting up.
We had a Litchfield Type 25 in last year that we cariied out some work on. We tested the car before doing anything and it posted a very respectable 480bhp from its 2.5 Cosworth long motor. However it was very laggy for road use and ran nearly 2 bar to achieve the figures, we thought we could do better. Intially we upgraded it's Alcatek ecu to the latest firmware and remapped it making fairly decent gains in torque from better tuning of the AVCS timing. It still didn't quite perform how we thought a fast road car should so we took the decision to replace the turbo.
We selected a 450bhp rated MDX555 from Turbo Dynamics and fitted it in place of the original unit.
Below are the figures from the original map and turbo, the remapped figures and the new turbo and remap figures.
In my experience, these 420, 450, 500 rated turbos share a common design as of course they would when you think about it.
For instance, a 450bhp rated turbo is likely to be based on a GT30 core and turbine wheel, have a 71mm exducer on the comp wheel and most now come with custom exhaust housings.
In essence the same thing regardless of who makes it, so they should give similar results.
You could also look at the MDX321H as that is more like the SC42 than the T is.
I've tried many, many turbos over the years aimed at specific power levels and it usually comes down to far more than just bolting it on and winding the boost up.
Often they won't hit what the makers of them say they will on run of the mill cars, because the figures posted have been done on something a bit fruitier.
The correct selection of supporting modifications can make a huge difference as can proper fuel and of course proper setting up.
We had a Litchfield Type 25 in last year that we cariied out some work on. We tested the car before doing anything and it posted a very respectable 480bhp from its 2.5 Cosworth long motor. However it was very laggy for road use and ran nearly 2 bar to achieve the figures, we thought we could do better. Intially we upgraded it's Alcatek ecu to the latest firmware and remapped it making fairly decent gains in torque from better tuning of the AVCS timing. It still didn't quite perform how we thought a fast road car should so we took the decision to replace the turbo.
We selected a 450bhp rated MDX555 from Turbo Dynamics and fitted it in place of the original unit.
Below are the figures from the original map and turbo, the remapped figures and the new turbo and remap figures.
In my experience, these 420, 450, 500 rated turbos share a common design as of course they would when you think about it.
For instance, a 450bhp rated turbo is likely to be based on a GT30 core and turbine wheel, have a 71mm exducer on the comp wheel and most now come with custom exhaust housings.
In essence the same thing regardless of who makes it, so they should give similar results.
Last edited by MartynJ; 19 March 2014 at 11:17 AM.
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#10
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The original turbo was a Litchfield/Turbo Dynamics hybrid with a twin scroll to single scroll uppipe and a 4 bolt flange.
It spooled like a b*****d when it was done
#11
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Also shows what a properly sorted engine will do on even the most average of turbos.
#12
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Looks like the turbo I've been look for for my 2.5 to replace my SC46.
Do you remeber if it was standard 58mm inlet?
Is that with 0.60 a/r Comp cover? Would the extra for bronze bearing carriers and ceramic coatings be worth ordering?
Thanks
#13
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Nice one Martyn, 500+ with a splash of meth then.
Looks like the turbo I've been look for for my 2.5 to replace my SC46.
Do you remeber if it was standard 58mm inlet?
Is that with 0.60 a/r Comp cover? Would the extra for bronze bearing carriers and ceramic coatings be worth ordering?
Thanks
Looks like the turbo I've been look for for my 2.5 to replace my SC46.
Do you remeber if it was standard 58mm inlet?
Is that with 0.60 a/r Comp cover? Would the extra for bronze bearing carriers and ceramic coatings be worth ordering?
Thanks
I'd look at the rest of your set up first before you go any further, as I say it's crucial. Improve the VE and you'll make more power out of your existing turbo.
Turbo had a 3 inch intake with the .60 a/r comp cover.
What is the spec of the rest of the engine ?
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Easy, could have done 500+ on Vpower with more boost, 1.5 bar max !
I'd look at the rest of your set up first before you go any further, as I say it's crucial. Improve the VE and you'll make more power out of your existing turbo.
Turbo had a 3 inch intake with the .60 a/r comp cover.
What is the spec of the rest of the engine ?
I'd look at the rest of your set up first before you go any further, as I say it's crucial. Improve the VE and you'll make more power out of your existing turbo.
Turbo had a 3 inch intake with the .60 a/r comp cover.
What is the spec of the rest of the engine ?
Just not too early spooling up not pulling full torque untill around 4400rpm
Would like to stay with 58mm inlet would this make much difference?
#16
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You both have fairly good specs but I think the real difference between both of yours and the example shown are the flowed heads and cams. As I said, far more to making it really work than just the turbo.
Oiler I think you in particular may struggle to find a replacement turbo that may be any better than you have. The SC46 in my experience is very, very good on a 2.5.
Craig as I mentioned earlier the MDX321H may have been a better choice for you with the benefit of hindsight !
Oiler I think you in particular may struggle to find a replacement turbo that may be any better than you have. The SC46 in my experience is very, very good on a 2.5.
Craig as I mentioned earlier the MDX321H may have been a better choice for you with the benefit of hindsight !
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You both have fairly good specs but I think the real difference between both of yours and the example shown are the flowed heads and cams. As I said, far more to making it really work than just the turbo.
Oiler I think you in particular may struggle to find a replacement turbo that may be any better than you have. The SC46 in my experience is very, very good on a 2.5.
Craig as I mentioned earlier the MDX321H may have been a better choice for you with the benefit of hindsight !
Oiler I think you in particular may struggle to find a replacement turbo that may be any better than you have. The SC46 in my experience is very, very good on a 2.5.
Craig as I mentioned earlier the MDX321H may have been a better choice for you with the benefit of hindsight !
What was the spec of heads and cams on the T25 above?
Thanks
#18
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The Type 25 had Cosworth CNC ported large valve heads and Cosworth 278/274 camshafts.
You could always have the exhaust housing replaced again with their all new cast 7cm version.
You could always have the exhaust housing replaced again with their all new cast 7cm version.
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