who have test a t38
08-03-2006, 08:05 PM
#3
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And mine and Dave's T38's are different in spec' just to confuse you, then there's also the Turbo Technics T38.
I think mine's the mutt's nuts - pulls from low down, like a t34 with .48 exhaust housing and pulls all the way to the limiter.
PS That's NOT my dyno graph (first one) Doug
(I think it's Paul from RooseMotorsport hoses)
I think mine's the mutt's nuts - pulls from low down, like a t34 with .48 exhaust housing and pulls all the way to the limiter.
PS That's NOT my dyno graph (first one) Doug
(I think it's Paul from RooseMotorsport hoses)
08-03-2006, 08:26 PM
#6
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A very 'efficient' engine, spec'd around my requirements (low lag, quick daily driver).
6 longstuds
4 layer metallic head gasket
Undisclosed cams spec'd for engine/turbo
Nick Waples polished & ported head
4x403 'grey' injectors
Big wing sump
Mapped on engine dyno, and then the map tweaked once engine run in and back in the car.
Mine makes 451BHP (on the engine dyno) If you are wanting 350-400bhp, you may be better off with the T34 with .48 housing, which will make for a nice low lag engine. Damo has 375bhp with this turbo and light blue 400 injectors (dyno mapped).
6 longstuds
4 layer metallic head gasket
Undisclosed cams spec'd for engine/turbo
Nick Waples polished & ported head
4x403 'grey' injectors
Big wing sump
Mapped on engine dyno, and then the map tweaked once engine run in and back in the car.
Mine makes 451BHP (on the engine dyno) If you are wanting 350-400bhp, you may be better off with the T34 with .48 housing, which will make for a nice low lag engine. Damo has 375bhp with this turbo and light blue 400 injectors (dyno mapped).
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08-03-2006, 08:36 PM
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Sorry, I've edited to say light blue '400' injectors - they're next size up from dark green 803's, but don't supply as much fuel as the grey 403's.
Undisclosed cams, means my tuner doesn't wish to say publicly what cams are used, as he spends a lot of time developing engines & parts. It's fairly common for tuners to 'protect' their development work.
Another option, for those who don't wish to have head work done (polishing & porting) or rebuilt engine, is going to grey injectors & a re-map for approx 380 bhp. Engine obviously has to be in good condition to start with.
Undisclosed cams, means my tuner doesn't wish to say publicly what cams are used, as he spends a lot of time developing engines & parts. It's fairly common for tuners to 'protect' their development work.
Another option, for those who don't wish to have head work done (polishing & porting) or rebuilt engine, is going to grey injectors & a re-map for approx 380 bhp. Engine obviously has to be in good condition to start with.
08-03-2006, 08:38 PM
#9
Boost Builder
sygjim the head spec and cams need to be done to work with the turbo to stop surging and alike, tuners spend massive amounts of time and money trying to get the ideal setup and as such dont want to disclose all their hard work hence "secret"
i must experiment
i must experiment
08-03-2006, 08:45 PM
#13
many thanks, i am learning english by using your forum and reading fast ford and performance ford 
Ok, i understand for the cams
and what is the sepc for this t34 ? because, i think tha there is a lot of different turbo with the same name T34, it's very confusing
T34 with .48 housing
t34 with .63 housing, etc......
Ok, i understand for the cams
and what is the sepc for this t34 ? because, i think tha there is a lot of different turbo with the same name T34, it's very confusing
T34 with .48 housing
t34 with .63 housing, etc......
08-03-2006, 08:52 PM
#14
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The 'T34' I mean, is the turbo as fitted to the early Escort Cosworth (they come with a .63 exhaust housing normally), but with the smaller exhaust housing (.48) for less lag. A 360 degree bearing in the turbo would also be recommended (more reliable as it is a 'full circle' - std bearing is 270 degrees or 3/4 of a circle).
08-03-2006, 09:07 PM
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The 'size' and power capability of the T38 turbos are between T34 (EsCos turbo with .63 exhaust housing) and the T4.
So,
T34 with .48 up to approx' 375 BHP (maximum)
T34 with .63 up to approx' 400-410 BHP
T38 (remember, there's several types) 420-470 bhp
T4 up to 500+BHP
So the T38 is a nice compromise of power, but without the lag of the T4 (power and boost comes in lower down in the rev' range)
The above approximate power levels are of course dependant on injectors (fuel supplied) and engine spec'
The smaller turbos give very good response and low down boost, but at the expense of power tailing off at higher rev's
So,
T34 with .48 up to approx' 375 BHP (maximum)
T34 with .63 up to approx' 400-410 BHP
T38 (remember, there's several types) 420-470 bhp
T4 up to 500+BHP
So the T38 is a nice compromise of power, but without the lag of the T4 (power and boost comes in lower down in the rev' range)
The above approximate power levels are of course dependant on injectors (fuel supplied) and engine spec'
The smaller turbos give very good response and low down boost, but at the expense of power tailing off at higher rev's
08-03-2006, 09:19 PM
#18
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Originally Posted by Billabong
The 'size' and power capability of the T38 turbos are between T34 (EsCos turbo with .63 exhaust housing) and the T4.
So,
T34 with .48 up to approx' 375 BHP (maximum)
T34 with .63 up to approx' 400-410 BHP
T38 (remember, there's several types) 420-470 bhp
T4 up to 500+BHP
So the T38 is a nice compromise of power, but without the lag of the T4 (power and boost comes in lower down in the rev' range)
The above approximate power levels are of course dependant on injectors (fuel supplied) and engine spec'
The smaller turbos give very good response and low down boost, but at the expense of power tailing off at higher rev's
So,
T34 with .48 up to approx' 375 BHP (maximum)
T34 with .63 up to approx' 400-410 BHP
T38 (remember, there's several types) 420-470 bhp
T4 up to 500+BHP
So the T38 is a nice compromise of power, but without the lag of the T4 (power and boost comes in lower down in the rev' range)
The above approximate power levels are of course dependant on injectors (fuel supplied) and engine spec'
The smaller turbos give very good response and low down boost, but at the expense of power tailing off at higher rev's
08-03-2006, 09:54 PM
#19
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Well if it helps you feel any better, you should still be able to sell your T4 for a decent amount of money, should you choose to swap to a more responsive turbo.
08-03-2006, 09:54 PM
#20
PassionFord Post Troll
T38, Fully Modified Head, 7.5:1, Grey Injectors = 428bhp for me......Limited due to the injectors supplying their maximum fuelling capacity.
With better injectors...It will make 450bhp.
With better injectors...It will make 450bhp.
08-03-2006, 09:58 PM
#21
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Don't forget my figures are engine dyno' Jim, will be less in car - and you can't really compare engine dyno with chassis dyno figures.... I too am 'out of fuel'.
08-03-2006, 10:29 PM
#22
PassionFord Post Troll
Hi Bill,
Yep, ours are probably very close if they were measured on the same dyno.......Who'd have guessed a few years back (Apart From The Experts) that greys would no longer be big enough......!!!!!
Yep, ours are probably very close if they were measured on the same dyno.......Who'd have guessed a few years back (Apart From The Experts) that greys would no longer be big enough......!!!!!
09-03-2006, 09:53 AM
#24
Originally Posted by Jim Green
Hi Bill,
Yep, ours are probably very close if they were measured on the same dyno.......Who'd have guessed a few years back (Apart From The Experts) that greys would no longer be big enough......!!!!!
Yep, ours are probably very close if they were measured on the same dyno.......Who'd have guessed a few years back (Apart From The Experts) that greys would no longer be big enough......!!!!!
...and who'd thought youd be able to run 1000cc injectors and get good emmissions and no bore wash!!
23-06-2006, 02:20 PM
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If you have a good working T34, you could upgrade to 'T38' spec compressor for a couple of hundred from most turbo reman companies...
You can almost get the same, by modifying a standard 2wd/4wd turbo..
You can almost get the same, by modifying a standard 2wd/4wd turbo..
23-06-2006, 02:52 PM
#31
DEYTUKURJERBS
Originally Posted by foreigneRS
i kind of understand the need for the 'secret cams' business, but it wouldn't take a genius to measure them 
"Secret Cams" is usually tuner speak for standard ones IMO...
23-06-2006, 02:52 PM
#32
Just to confuse things there are different specs of "T38". I know for a fact that Harvey bought several different compressor wheels / exhaust wheels and mixed and matched them to produce the perfect turbo - which is the one that Bill has. This means that even the turbo suppliers don't know what the spec is that Bill has, as they don't know what was finally settled on and don't have an engine dyno to carry out the same experiments that Harvey did, so have to "guess" using compressor maps as a "guide" only. However, this will only get you close, as you can't beat proper R&D .
.
23-06-2006, 03:04 PM
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Originally Posted by Mike Rainbird
This means that even the turbo suppliers don't know what the spec is that Bill has, as they don't know what was finally settled on and don't have an engine dyno to carry out the same experiments
23-06-2006, 03:08 PM
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Originally Posted by Mike Rainbird
Just to confuse things there are different specs of "T38". I know for a fact that Harvey bought several different compressor wheels / exhaust wheels and mixed and matched them to produce the perfect turbo - which is the one that Bill has. This means that even the turbo suppliers don't know what the spec is that Bill has, as they don't know what was finally settled on and don't have an engine dyno to carry out the same experiments that Harvey did, so have to "guess" using compressor maps as a "guide" only. However, this will only get you close, as you can't beat proper R&D .
.
23-06-2006, 03:18 PM
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Originally Posted by Doug Stirling
Originally Posted by DaveAVT
I have a TT T38 here on a GTA V6 Turbo, and its using a 54 Trim TO4E wheel, roughly £75 + VAT..
23-06-2006, 03:21 PM
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Originally Posted by Stavros
Originally Posted by foreigneRS
i kind of understand the need for the 'secret cams' business, but it wouldn't take a genius to measure them
"Secret Cams" is usually tuner speak for standard ones IMO...
Undisclosed cams, means my tuner doesn't wish to say publicly what cams are used, as he spends a lot of time developing engines & parts. It's fairly common for tuners to 'protect' their development work.
23-06-2006, 04:04 PM
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Anyone know how a Universal Turbos T38 performs compared to the TT version and Harveys 'special' ?
Any guesses on max bhp / trq based on 7.5cr, 83lb injectors, worked head, 4x4 manifold and BD14's ?
Was hoping for 450 ish so looking at the above posts / graphs I cant be far out.
Cheers,
WD
Any guesses on max bhp / trq based on 7.5cr, 83lb injectors, worked head, 4x4 manifold and BD14's ?
Was hoping for 450 ish so looking at the above posts / graphs I cant be far out.
Cheers,
WD