nick baker
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| posted on 9/2/05 at 09:24 AM |
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Thanks Garage19, that's Great info!!! 
As I promised earlier I chased up a garret bloke, and here's the question i asked and the reply.
THE QUESTION:
I've been informed that diesel turbos should not be used on petrol engines due to turbine design/temperature issues... (900°C Exhaust Vs 650°C
exhaust) This info was passed om to me Via a friend at Holset who specialises in diesel turbo applications.
However.... The GT15 (used on diesel cars) seems to be featuring a lot in Bike-engined Turbo conversions.... will they withstand the temperatures
involved, or are people just being lucky?
ANSWER from Garret Techical (via Gary, a Garret Distributor)
Generally speaking the first sentence is correct. We have five or six different turbine housing materials that we will use according to the turbine
inlet conditions of each individual application. Also, two different turbine wheels. In addition, we can use heat shrouds where necessary on specific
applications, which means the housings have to machined to suit. Each turbo is bespoke to its application. Some of the high output diesels are now
getting up towards petrol type temperatures, but these are all VNTs now anyway, most of which use Inconel, D5-Niresist and stainless steels in their
construction.
I know that some people are using GT15 and derivatives for retro-fitting, but unless they are using one which is specifically for a petrol engine,
they must be prepared for turbine housings cracking and a short life for the turbo. The standard thrust bearings on most of the standard GT15s will
not stand high boost pressures, although for most bikes (which are pretty powerful anyway) they probably don't need a lot!
Right... hope that helps. I'll look up this thread if I ever get around to doing it myself!!!
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alister667
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| posted on 9/2/05 at 12:24 PM |
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Lads this is brilliant - many thanks again for all your input.
You have, no doubt, saved me a lot of time and trouble.
All the best once again,
Ali
http://members.lycos.co.uk/alister667/
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garage19
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| posted on 9/2/05 at 12:54 PM |
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No problems.
Some other tips are:
Use 2 genuine honda headgaskets to lower the CR.
If you are running carbs you will need a different fuel pump and a pressure sensing fuel regulator (for carbs, origanaly from esprit and mg turbo)
made by malapassi/FSE. These are available from Burton power, demon tweeks etc
Make sure you have a pressure feed to the float bowls or you will get no fuel when it comes on boost!!
If you have pressurised the carbs correctly, then the jetting you will need won't be far from stock.
An intercooler is a good idea. Chop up one from a small turbo car and make you own head tanks.
Dump valves sound cool on a bike!!!
Before running any boost stick it on a dyno and see which way the AFR is heading as you climb up the rpm.
Alternitavely buy a wide band lambda kit and make tuning much easier!
Running injection makes tuning much easier.
If you run injection you don't need to have four throttle bodies. You can make a plenum up with just one throttle body like a car. I have seen
450 bhp ZZRs with this set up and megasquirt.
Turbo bikes engines are great. Mine had no lag and the bike would take off from a top gear roll on like you were in second!
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colibriman
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| posted on 10/2/05 at 01:57 AM |
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Great stuff Doug - thanks for your invaluable advice.
still think your the man for making us all a kit.....
Go on, Go on, Go on.........(said with a dodgy Irish accent - a la Mrs Doyle)
Nick - well done for coming up with that from Garrett.....saves us all guessing and messing up.....
need a bike engine? - www.colibriman.com
SVA ready Mk Indyblade possibly for sale.....if the offers good...!
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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ChrisGamlin
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| posted on 10/2/05 at 07:45 AM |
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You got back OK then Colin, cant have been too bad a drive back from mine then if you're already back home posting by 2am
Chris
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alister667
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| posted on 10/2/05 at 08:16 AM |
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Doug,
Do you think an Uno Turbo would be suitable for a 919cc Blade as well, or would you recommend the Garrett T105 for this?
The reason I ask is that the 3 of us who are intending to modify the CBR1000 all have road going blade cars too......
Thanks again
Ali
http://members.lycos.co.uk/alister667/
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colibriman
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| posted on 10/2/05 at 09:23 AM |
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Hi Chris,
Was mostly a good run - got home bout 1.40....weather turned rubbish from Birmingham though...
got stuck behind a wide load (with a police escort) doing 25 mph for the last 9 miles.....man that was frustrating...!
enjoy your modding and thanks for your business !
(Sorry for the sidetracking hijack Ali and all)
cheers
Colin
[Edited on 10/2/05 by colibriman]
need a bike engine? - www.colibriman.com
SVA ready Mk Indyblade possibly for sale.....if the offers good...!
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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garage19
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| posted on 11/2/05 at 09:03 AM |
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quote:
Originally posted by alister667
Doug,
Do you think an Uno Turbo would be suitable for a 919cc Blade as well, or would you recommend the Garrett T105 for this?
The reason I ask is that the 3 of us who are intending to modify the CBR1000 all have road going blade cars too......
Thanks again
Ali
Now that i have had experience of it I would recommend for the RHB5 (fiat uno turbo) for a blade.
Making a turbo kit for a bike engine in a car should be easier than in a bike because you will have less restraint on space.
You can place the turbo over to the side of the engine.
Give me a shout if you want any help with manifold design.
Doug.
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drp
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| posted on 12/2/05 at 01:35 AM |
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Use 2 genuine honda headgaskets to lower the CR
wouldn't it be better to fit an extra base gasket to lift the barrels and keep the head gasket single so the extra 'pressure' from
the turbo doesn't blow it. cheers drp
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