T38 SCS Spec vs Turbo Dynamics MD240 (decided !!!)
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T38 SCS Spec vs Turbo Dynamics MD240 (decided !!!)
which one better for low comp 420 HP engine rebuild by SCS/Harvey Gibbs...?
Last edited by Kosi Kausar; 10-09-2009 at 02:44 PM.
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Mark Shead from MADevelopment right..?, perhaps you don't remember me..but about 13 years ago I went to your workshop with my brother..when I was travelling to london at that time, how RU doin' mate..?
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is the GT3071 much more expensive than T38..and yes actually Harvey recommend me to use T38 SCS Spec, just reading some old post here and Simon S.E.C.S had good experience with MD240..so I need second opinion from you guys...
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I know its better but you should be taking advice from your engine builder as then if you dont get what you want/expect its his fault,
Theres not much cost diff.
Mark
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well..I'll talk to Harvey, he is a very open minded person from my previous communication with him..and Mark which turbo that you said "I know it's better " ?
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confirmed..!
after discussing with Harvey and read the dyno sheet comparison that he email to me, finally we decided to go with MD 240 SCS Spec..so it only gave 405 HP, but with very quick throttle response (boost came at 2250
RPM with 279.1 Lbs/Ft of torque@2500 RPM) Max Torque: 397Lbs/Ft@4000 RPM, Max Power: 405.1HP@6000 RPM ..less 20HP than the original plan with T38 though..but it'll be much fun to ride I supposed
now is the waiting game...
Thank's for your input mates..!
RPM with 279.1 Lbs/Ft of torque@2500 RPM) Max Torque: 397Lbs/Ft@4000 RPM, Max Power: 405.1HP@6000 RPM ..less 20HP than the original plan with T38 though..but it'll be much fun to ride I supposed
now is the waiting game...
Thank's for your input mates..!
#16
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Be interesting to see how a MD240 SCS varies from the usual shite that carries the MD240 label, as it sounds like you have got good results there, although personally I dont need to drive my car everywhere in 5th gear so would have preferred slightly later boost in the RPM from a GT3071 and it going miles better in the midrange and topend.
I can never see the appeal of focussing your tuning at sub 3Krpm on a vehicle fitted with a gearbox TBH!
I can never see the appeal of focussing your tuning at sub 3Krpm on a vehicle fitted with a gearbox TBH!
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saff is working!!!...atm
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.....no he didn't....the title says 420........but now he's going for 405.........so sorry to be fucking pedantic but a t34 will do that and be on FULL boost by 3400rpm.........
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#21
nobody said anything about full boost..hes already mapped it and its doing 400lb ft by 4k..yout34 will be circa 4400 rpm prob more..he has near nigh 300lb ft at 2250..your t34 will just be boosting by then...not the type of power id go for but if the bloke wanted 500 bhp he would of gone gt30..he didnt he wanted as much low down response as poss hence the way he and harvey went..fair play..cheers danny
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nobody said anything about full boost..hes already mapped it and its doing 400lb ft by 4k..yout34 will be circa 4400 rpm prob more..he has near nigh 300lb ft at 2250..your t34 will just be boosting by then...not the type of power id go for but if the bloke wanted 500 bhp he would of gone gt30..he didnt he wanted as much low down response as poss hence the way he and harvey went..fair play..cheers danny
#23
yes i thought so as it was obviuos to me as harvey wouldnt of mentioned it..hes obviously got round the surging issues others have had too or he wouldnt bother using it...car will be very lively..cheers danny
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Car will be very lively in situations like when you nail it at low rpm in a high gear on a motorway, much like a T3 car, but I bet its died on its arse at the high end of the rev range so I certainly wouldnt want it on a trackday toy etc.
So it depends what it is used for.
GT3071 does both jobs at once very well IMHO
Do you have a printout of the results for it off the dyno so we can see if im right about the torque curve dieing on its arse after about 6K?
So it depends what it is used for.
GT3071 does both jobs at once very well IMHO
Do you have a printout of the results for it off the dyno so we can see if im right about the torque curve dieing on its arse after about 6K?
Last edited by Chip; 10-09-2009 at 04:22 PM.
#25
Car will be very lively in situations like when you nail it at low rpm in a high gear on a motorway, much like a T3 car, but I bet its died on its arse at the high end of the rev range so I certainly wouldnt want it on a trackday toy etc.
So it depends what it is used for.
GT3071 does both jobs at once very well IMHO
Do you have a printout of the results for it off the dyno so we can see if im right about the torque curve dieing on its arse after about 6K?
So it depends what it is used for.
GT3071 does both jobs at once very well IMHO
Do you have a printout of the results for it off the dyno so we can see if im right about the torque curve dieing on its arse after about 6K?
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mates...I lived in Jakarta - Indonesia, which is one of the most traffic jam city in the world..and we don't have much private road neither country road that you can really explore the maximum engine potential..that's why I was going this route to enjoy my ride optimally..before I was on GGR Stage 3 375HP which was more than enough power.
I even become national champion in european car race back then on 1997 with that engine, competing with highly tuned BMW, Mercedes, Alpha Romeo..etc. Anyway I really appreciated all of your concern.
And as requested this is a dyno sheet of the SCS Spec MD240
RPM LBS/FT BHP
2500 279.1 133.7
3000 357.4 204.5
3500 392.1 264.7
4000 397.0 303.4
4500 385.1 331.7
5000 384.4 366.2
5500 370.2 389.3
6000 353.3 405.1
6500 308.6 382.1
7000 290.4 386.6
I even become national champion in european car race back then on 1997 with that engine, competing with highly tuned BMW, Mercedes, Alpha Romeo..etc. Anyway I really appreciated all of your concern.
And as requested this is a dyno sheet of the SCS Spec MD240
RPM LBS/FT BHP
2500 279.1 133.7
3000 357.4 204.5
3500 392.1 264.7
4000 397.0 303.4
4500 385.1 331.7
5000 384.4 366.2
5500 370.2 389.3
6000 353.3 405.1
6500 308.6 382.1
7000 290.4 386.6
#30
mates...I lived in Jakarta - Indonesia, which is one of the most traffic jam city in the world..and we don't have much private road neither country road that you can really explore the maximum engine potential..that's why I was going this route to enjoy my ride optimally..before I was on GGR Stage 3 375HP which was more than enough power.
I even become national champion in european car race back then on 1997 with that engine, competing with highly tuned BMW, Mercedes, Alpha Romeo..etc. Anyway I really appreciated all of your concern.
And as requested this is a dyno sheet of the SCS Spec MD240
RPM LBS/FT BHP
2500 279.1 133.7
3000 357.4 204.5
3500 392.1 264.7
4000 397.0 303.4
4500 385.1 331.7
5000 384.4 366.2
5500 370.2 389.3
6000 353.3 405.1
6500 308.6 382.1
7000 290.4 386.6
I even become national champion in european car race back then on 1997 with that engine, competing with highly tuned BMW, Mercedes, Alpha Romeo..etc. Anyway I really appreciated all of your concern.
And as requested this is a dyno sheet of the SCS Spec MD240
RPM LBS/FT BHP
2500 279.1 133.7
3000 357.4 204.5
3500 392.1 264.7
4000 397.0 303.4
4500 385.1 331.7
5000 384.4 366.2
5500 370.2 389.3
6000 353.3 405.1
6500 308.6 382.1
7000 290.4 386.6
#31
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So 15% or so more than on this MD240SCS, which to me is worth far more than it being more useful under 3Krpm, but im thinking in trackday car terms, as I mentioned earlier for a road car, it sounds like a great conversion that harvey has done.
If you go and look at rich's graph it looks like his takes far far longer to spool than this one, but thats massively exagerated by the fact that harvey is forcabley holding the engine back at each break point where as rich's was just allowed to rev naturally, so as a result rich's hasnt had a large amount of time to spool the turbo at low RPM like on the dyno figures in this thread.
Thats not me accusing Harvey of any wrong doing, MAD do EXACTLY the same thing when they dyno their engines on exacrly the same type of dyno, but rich's graph was done a rolling road which works differently as it takes all the values in one go, not plots out multiple held values.
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