O/T But turbo related, advice needed on a str8 six
Turbo Mini Forums

i have a longterm project that hopefully by the end of the summer will be road legal but i'm seriously thinking of adding a turbo on its 2.5 litre straight 6 petrol engine, it has a C/R of 8.5.1 & a 2.5" single silencer exhaust system, so it runs twin SU carbs so i could do with a lil advice there too! i think would do pretty good with a turbo on there!

with the experiance of some of you guys what turbo would you say be a good choice,

i think i could bag a bit of cheap turbo'd power with this engine, what you think

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Personally If i were to turbo that i'd use a std RS Turbo turbo, as it should do the job and ther's plenty about cheap,

for the carbs, if possible i'd put on a single SU as i wouldn't want to try balencing a pair with a turbo, just use a metro turbo carb and plenum, 6psi of boost should see some worthwhile gains.

Does a single carb manifold exist for that engine?

I have a return fuel line plumbed in this beast just incase i go this route, also have a spare fuel pressure reg etc i have most bits apart from oil feed/return to a turbo, but also need a turbo for the motor, i'll make an adaptor flange so the turbo of choice will bolt to the stock cast manifold, the exhaust link from turbo 2 system is easy enough, once i have these bits plumbed in & the engine running right i'll think about an intercooler but for now a turbo is the way i'd like to go

no there is no single carb manifold :( i think this maybe my main problem,

the engine in the car is good & strong with no problems at all & has a 5 speed box

this car will end up my car that will be used to tow my mini 2 & from trackdays etc so i think it'll be pretty cool to have a turbo tow car & turbo mini on the trailer i'm no after big hp just a good pull from the motor when on boost

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

can you take a pic of the manifold?

it might be possible to do a qick and dirty cut and shut with a mini (or other SU) manifold.

Triumph? GT6 or vitesse? or am i way off?

As for turbos, it'll move a fair bit of air so depending on the boost you want to run and how you want the power to come in.

Plug the specifics into this,

http://www.motorgeek.com/index.php?page=6

A 50 trim t3 looks ok at 10 psi.

it is a triumph 2.5ltr st8-6 motor good guess there!

i think it'll move quite well with turbo strapped on it!

is'nt the triumph 2.5 piston that can be used to make a cheapo 1380, i think they are a 73.5mm piston

the triumph has 6 of these big buggers! thats quite a bit of air being consumed,

thats a pretty good site there mini13, good call

i'll get a pic of the intake manifold

i only want the power for the 'loud' pedel really, its quite a low revving motor, think boost from about 3500-4000 should be about right, i dont mind using turbo lag to gain that effect if you get my meaning! keep the 'so-called' econamy off boost hehe

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Not much about thats a straight six that isn't bmw and 2.5l!! Have you tried any triumph forums?

all the triumph guys are a bit beardy & dont understand what turbos are hehe!
they dont really entertain the idea :S

i was looking a the datsun 240/60/80 z cars for ideas, they tend to use fuel injection & a turbo or two, they make some serious power too!

i'd like to stick with either 1 bigger carb or the 2 on it if possible, i'd like to do it as cheap as possible ie srapyard parts

i may stick megajolt on it though for good reason

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

I reckon the std metro turbo carb will be up to it, ok for over 200 nana's and i wouldn't put too much boost in without rebuilding the engine, plus arn't the pistons in the 2.5 a bit weak?

wouldn't it be possible to use 2 metro turbo carbs make your own air box plenty of choices on turbos if your making/adapting your own manifold

the cast exhaust manifold will stay & as its pretty easy to make take a turbo, maybe a good 2nd-hand 2.5 imprezza turbo, could prove cheap due to them being upgraded all the time!

the intake may have to be binned in favour of a self fabricated mild steel tubuler jobby, some ppl are seeing more than 200hp using a metro turbo carb so that could be the way i'll go mini13 cheers for that!!!

i dont know about the pistons, it'll be a put together & make work job then worry about the motor later, its a really good engine i have & i can change the crank bearings in situ as is so i know they will be ok, timing chain can be chk'ed & retensioned, proboly chage the cluthc but as i say, i'd make it run with a turbo at a low boost 1st, i spose initially 5psi should be ok

its a lovely smooth engine but 100hp from a 2.5 str8-6 seems a bit naff, its very torquey & a gr8 tow car so a turbo i think is a good option, if it all works ok i can move on to other mods like the head etc later on cant i!

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

the cast exhaust manifold will stay & as its pretty easy to make take a turbo, maybe a good 2nd-hand 2.5 imprezza turbo, could prove cheap due to them being upgraded all the time!

the intake may have to be binned in favour of a self fabricated mild steel tubuler jobby, some ppl are seeing more than 200hp using a metro turbo carb so that could be the way i'll go mini13 cheers for that!!!

i dont know about the pistons, it'll be a put together & make work job then worry about the motor later, its a really good engine i have & i can change the crank bearings in situ as is so i know they will be ok, timing chain can be chk'ed & retensioned, proboly chage the cluthc but as i say, i'd make it run with a turbo at a low boost 1st, i spose initially 5psi should be ok

its a lovely smooth engine but 100hp from a 2.5 str8-6 seems a bit naff, its very torquey & a gr8 tow car so a turbo i think is a good option, if it all works ok i can move on to other mods like the head etc later on cant i!

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Sounds a good plan!

if you found yourself pushing much more than 200 ponys eventally, there was a 2" hif on jag's, one of those couuld be converted for boost....

I just had a looksie through the vizard book, the "weak" piston i was thinkin about was the 73.6mm spitfire piston, there is no reference to the strength of the 74.7mm piston from the 2.5 so i guess you'll be ok for a bit of boost.

Found this too!!!
check the manifold...

http://www.cs.du.edu/~ljanssen/tr6_turbo.html

http://www.teglerizer.com/fi/GT6_manifold/...6_manifold.html

Edited by Joe C on 24th Feb, 2007.

If it has 2 SU's already, why not just slap on 2 turbo SU's ??

As for turbo, RS Turbo would be way too small.

Another small turbo would be a Subaru TD04, but you will buy one for buttons on ebay, and it should be virtually lag free, and easily be capable of 200+

Im sure you'd buy one for around £50 or so, as everyone removes them to upgrade to other turbos.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

well initially i thought the Rs blower would be ok but its smaller than i thought.

i've been looking on those sites, i got me some idea for a single intake manifold, a 3 into 1, it may not have gr8 flow characteristics but i think the boosted intake pressure will sort that out & the exhaust mod is easy enough, i feel a turbo tow-car triumph for avon 2008 or if things go smoother the end of the year around november

my engine makes 106bhp at the moment, what do you chaps feel could be a possible result from a turbo on my triumph

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

a blown engine ? lol


how long is a piece of string ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

The only thing I'll say here is that the tow car is just that, something to get you there and back. Don't fall into the trap of trying to make it something it isn't, I was once servicing on a stage rally near Carlisle, and we were parked opposite a team running a Mk2 Escort. Every service interval they spent about 5 mins giving the rally car a quick look over then the rest of the hour repairing the bloody chase car, which was an old SD1 with some tuned V8 in it. Oh how we laughed at them, whilst we spent the hour sorting out the rally car and the only work needed on our chase car was to put some more Lucozade and sarneys in the back for the crew......

an rst will blow 220 bhp of air without much problems into a 1.6.

So it shoul be ok for a low oost appliaction.

To make sure do crack out a compressor map and do the maths :)

Alex

AlexF