MG B Turbo : MGB & GT Forum : The MG Experience

MG B Turbo #1
tdbfrog Randall Everson Edenvale, Gauteng, South Africa Sign in to contact 1958 MG MGA 1500 1958 MG MGA Twin-Cam 1980 MG MGB MkIV	Topic Creator (OP) Jul 29, 2015 12:05 PM Joined 10 years ago 35 Posts

Hi been chatting to a local Garrett distributor about a turbo for my 1980 B he suggests a GT2560R as the best solution what you guys think? Also will a 270 piper camshaft have any influence on improving the Ve (volumeteric efficiency) of the engine, the stock engine Ve is 75% per Peter Burgess which is pretty low.
Randall.

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Re: MG B Turbo #2
ohlord Rob C A tiny Island off the coast of Washington State, N.W., USA Sign in to contact 1957 Land Rover Series I "EYEYIYI" 1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more	Jul 29, 2015 06:57 PM Top Contributor Joined 12 years ago 28,878 Posts

The 270 is a great little cam to max out a t25 you might want to look at a cam with similar lift but greater LSA

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Re: MG B Turbo #3
pinkyponk Adrian Page Berwick, NS, Canada Sign in to contact 1958 MG MGA 1500 1961 Austin-Healey Bugeye Sprite 1971 MG MGB GT 1973 MG MGB MkIII	Jul 29, 2015 09:36 PM Top Contributor Joined 13 years ago 14,759 Posts

The turbo will change the Ve to over 100%.

There are supercharger specific cams made for the MGB. I would look into one of those. A turbo supercharger or a belt driven supercharger should make little difference to the cam.

Adrian

Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.

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Re: MG B Turbo #4
ohlord Rob C A tiny Island off the coast of Washington State, N.W., USA Sign in to contact 1957 Land Rover Series I "EYEYIYI" 1957 Land Rover Series I "OVRLND" 1971 MG MGB 1971 MG MGB "Bedouin 2" & more	Jul 29, 2015 10:05 PM Top Contributor Joined 12 years ago 28,878 Posts

Big difference in a small turbo like the 25 and an SC different cam and exhaust needs.
Small disp turbo cam needs less lift and greater lsa and a good high cfm exhaust and work on he exhaust side of the head when porting work is done.
OP needs to look at recent thread on late model MGB turbo install.

LNDRVR4X4.COM
Home of Project "INCARN8'

1957 Series 1 Land Rover electric VEHICLE CONVERSION

FIXITUPCHAP.COM
FIXITUPCHAP INCORPORATED

RD3 Radar/ Electronic Warfare Technician
VIETNAM 1969-1972

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Re: MG B Turbo #5
pinkyponk Adrian Page Berwick, NS, Canada Sign in to contact 1958 MG MGA 1500 1961 Austin-Healey Bugeye Sprite 1971 MG MGB GT 1973 MG MGB MkIII	Jul 30, 2015 06:56 AM Top Contributor Joined 13 years ago 14,759 Posts

In reply to # 3049691 by ohlord Big difference in a small turbo like the 25 and an SC different cam and exhaust needs.
Small disp turbo cam needs less lift and greater lsa and a good high cfm exhaust and work on he exhaust side of the head when porting work is done.
OP needs to look at recent thread on late model MGB turbo install.

I'm just talking out of my *** (since I don't have a turbo B) but it sounds exactly the same, from your description. I'm putting in bigger exhaust valves and a larger pipe... per Peter Burgess.

Adrian

Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.

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Re: MG B Turbo #6
Octarine-Services Chris Betson Leigh on Sea, Essex, UK Sign in to contact 1973 MG MGB V8 Conversion "The Beast" 2002 Other Not Listed "Scully"	Jul 30, 2015 09:15 AM Joined 9 years ago 264 Posts

Talk to Piper - they are quite happy to grind a one off to suit your engine setup.

I have them grind a special cam for the supercharged engines I have built for people.

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Re: MG B Turbo #7
tdbfrog Randall Everson Edenvale, Gauteng, South Africa Sign in to contact 1958 MG MGA 1500 1958 MG MGA Twin-Cam 1980 MG MGB MkIV	Topic Creator (OP) Jul 30, 2015 09:16 AM Joined 10 years ago 35 Posts

Thanks guys the reason for asking abt the 270 cam is because my NA B has been running this cam for years and I don't really want to change it when I go turbo.
Adrian what size exhaust are you going to use I see the guys using the GT25 turbo are using 21/2 " dia pipe. Anyone using a GT2560R turbo on a B??
Randall.

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Re: MG B Turbo #8
smutt Dave Smeaton Ottawa, ON, Canada Sign in to contact 1978 MG MGB	Jul 30, 2015 10:08 AM Joined 8 years ago 227 Posts

Im using a t25 on my 1999 saab 93 turbo and Ive increased the exhaust to a 3 in down pipe ,this allowed me to increase max boost to 20 lbs and at that rate the saab 2ltre is at about 269 horsepower at the crank.Ive no idea what it wil do on an mgb but Im interested.Saab 93 used the t25 up until 2000 I think aso the 900 used it for a number of years,if your looking for a used one to rebuild.They are an excellent turbo !! What are you going to use to feed it fuel . THANKS DAVE S

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Re: MG B Turbo #9
pinkyponk Adrian Page Berwick, NS, Canada Sign in to contact 1958 MG MGA 1500 1961 Austin-Healey Bugeye Sprite 1971 MG MGB GT 1973 MG MGB MkIII	Jul 30, 2015 10:41 AM Top Contributor Joined 13 years ago 14,759 Posts

In reply to # 3049936 by tdbfrog Thanks guys the reason for asking abt the 270 cam is because my NA B has been running this cam for years and I don't really want to change it when I go turbo.
Adrian what size exhaust are you going to use I see the guys using the GT25 turbo are using 21/2 " dia pipe. Anyone using a GT2560R turbo on a B??
Randall.

I'm planning to go to 2". I have the Piper 270 in my supercharged B and it seems fine. It idles pretty darned nice at 1000rpm.

Adrian

Home built Eaton M62 Supercharger with 8psi boost, 8:1 compression, custom "supercharger" cam from Schneider Cams, Mikuni HSR48 Carburetor, custom ground high ratio "stock" rocker arms, Maxspeeding rods with Teflon wrist pin buttons, custom aluminum cold air intake, CB Performance computerized ignition, Fidanza 9 pound flywheel, 1.44 exhaust valves in 48cc chamber head, matched manifolds, 2 1/4" exhaust system.

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Re: MG B Turbo #10
tdbfrog Randall Everson Edenvale, Gauteng, South Africa Sign in to contact 1958 MG MGA 1500 1958 MG MGA Twin-Cam 1980 MG MGB MkIV	Topic Creator (OP) Jul 30, 2015 10:55 AM Joined 10 years ago 35 Posts

Hi Dave I think the GT2560R turbo is the later version of the T25 family and there is a junk yard close by that specialises in SAAB bits so its worth a visit, I plan to suck thru a SU HIF 44mm carb into the turbo I am not looking for mega hp just +-120 at the flywheel and max boost of 8-10psi.
Adrian good to hear you are running a 270 cam with your sc and as I recall from an earlier thread @ 9psi so what hp do you think you are getting?

Randall.

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