t38?
25-05-2008, 10:23 AM
#7
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youve always got the option of a GT30 internally gated, then with the .63 Housing.
spools up as quick as a T34 and capable of giving a healthy 450 ish BHP.
im sure Paul Ripley went for that turbo and made a few horses short of 500.
spools up as quick as a T34 and capable of giving a healthy 450 ish BHP.
im sure Paul Ripley went for that turbo and made a few horses short of 500.
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25-05-2008, 10:28 AM
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internally gated?? iv been told that the internal gated gt30 isnt as good as a external?? can anyone give me reasons why this is.. i know a external gated one can have more precise boost..bbut anything else?
25-05-2008, 12:24 PM
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25-05-2008, 07:32 PM
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i have a tt t38 on mine it is loads beter than my old t34... i have been in marco's 3door with the gt30 internal wastegate and it came on boost far quicker than mine with a similar spec engine... .. if i was buying brand new again i would choose the gt30...
25-05-2008, 10:16 PM
#27
I checked on GT30, I know a guy with GT30 that gets 425 at wheels on 23lb boost with top condition engine... He won't take it much higher in boost like his older T4 for a number of reasons.
I know others with GT30 that found that its max efficiency was lower boost (ie, it pushes more air at less boost, boost is not really the ultimate figure to go by) and that at high 20s it loses efficiency just generating heat... not pushing more air.
I suspect that the 425-450 is about its reasonable limit with great spool up... if that fits your needs that would be nice.
If not: if GT35 is like T4 as mentioned think about that one, depends on your area and usage... I have been recommended to use GT35 with std ex cam, and BD16 inlet and mild porting... Currently thats my choice, but I have occassional driver, track days and dyno days... as my intended usage, that is if I can ever put the car back together
I know others with GT30 that found that its max efficiency was lower boost (ie, it pushes more air at less boost, boost is not really the ultimate figure to go by) and that at high 20s it loses efficiency just generating heat... not pushing more air.
I suspect that the 425-450 is about its reasonable limit with great spool up... if that fits your needs that would be nice.
If not: if GT35 is like T4 as mentioned think about that one, depends on your area and usage... I have been recommended to use GT35 with std ex cam, and BD16 inlet and mild porting... Currently thats my choice, but I have occassional driver, track days and dyno days... as my intended usage, that is if I can ever put the car back together
Last edited by oohogwash1; 25-05-2008 at 10:19 PM.
25-05-2008, 11:06 PM
#28
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I checked on GT30, I know a guy with GT30 that gets 425 at wheels on 23lb boost with top condition engine... He won't take it much higher in boost like his older T4 for a number of reasons.
I know others with GT30 that found that its max efficiency was lower boost (ie, it pushes more air at less boost, boost is not really the ultimate figure to go by) and that at high 20s it loses efficiency just generating heat... not pushing more air.
I suspect that the 425-450 is about its reasonable limit with great spool up... if that fits your needs that would be nice.
If not: if GT35 is like T4 as mentioned think about that one, depends on your area and usage... I have been recommended to use GT35 with std ex cam, and BD16 inlet and mild porting... Currently thats my choice, but I have occassional driver, track days and dyno days... as my intended usage, that is if I can ever put the car back together
I know others with GT30 that found that its max efficiency was lower boost (ie, it pushes more air at less boost, boost is not really the ultimate figure to go by) and that at high 20s it loses efficiency just generating heat... not pushing more air.
I suspect that the 425-450 is about its reasonable limit with great spool up... if that fits your needs that would be nice.
If not: if GT35 is like T4 as mentioned think about that one, depends on your area and usage... I have been recommended to use GT35 with std ex cam, and BD16 inlet and mild porting... Currently thats my choice, but I have occassional driver, track days and dyno days... as my intended usage, that is if I can ever put the car back together
my will be used near enough everyday..so want it respeonsive.. think a gt30 will meet my requiremtens
425 atw seems a nice figure 
26-05-2008, 05:57 AM
#29
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Figures quoted for the two T38's (Universal Turbos & Turbo Technics) are accurate. I had Universal Turbo's T38 on the sapphire engine that Karl Norris built up, 7.5:1cr, Ported Head, Karls Cams, Grey Injectors, and it made 428bhp when it was only just run-in and still a little tight. Now (5,000 miles later) it's in the hands of Maxest it's producing more (440 BHP + If I remember correctly) due to Black Injectors and Autronic Management, but still on the T38.
If I was building the same engine today, I would use the GT30, for the faster spool up and slightly better top end. But bear in mind that originally both versions of the T38 were built for engines in the 400 - 450bhp bracket, they do exactly what they were designed for and both versions have proved that they're a very reliable turbo.
If I was building the same engine today, I would use the GT30, for the faster spool up and slightly better top end. But bear in mind that originally both versions of the T38 were built for engines in the 400 - 450bhp bracket, they do exactly what they were designed for and both versions have proved that they're a very reliable turbo.
Last edited by Jim Green; 26-05-2008 at 06:00 AM.
26-05-2008, 07:51 AM
#32
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these type of threads are facsinating but the stuff about the GT30 is confusing. there is a GT3076 which comes with 3 exhaust housing options and there is a GT3071 which also does. The 71 & 76 refer to the wheel size etc
http://www.atpturbo.com/Merchant2/me...egory_Code=GRT
so which turbo are we talking about?
http://www.atpturbo.com/Merchant2/me...egory_Code=GRT
so which turbo are we talking about?
26-05-2008, 11:14 AM
#37
