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Topic: turboing bob? (Read 1377 times) |
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kyanther
Newbie
cosworth 24v
 
Posts: 38
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turboing bob?
« on: Sep 23rd, 2008, 8:12pm » |
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i've just been given a set of turbos that were fitted to a race ultima (the kit car not the scorp!) with a race preped boa engine. this was pushing about 350 bhp and was looking at doing similar. does anyone know if i can fit to BOB as is or do i need to lower the compression ratio! if so by how much and whats the cheepest way? is there room to increase the chamber in the head.
ky
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: turboing bob?
« Reply #1 on: Sep 23rd, 2008, 8:58pm » |
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Suggest you contact someone like Turbo Technics.
I fitted a turbo on an Escort XR3 many years ago and the way to reduce the CR was to have the tops of the pistons machined. Obviously this would mean taking them out so you are talking about a full engine strip down and rebuild. Don't expect it to be a cheap conversion.
The kit alone for the XR3 was ( back in 1984 ! ) about £1200 and I did all the work myself apart from the piston machining, crankshaft polish and cylinder bore hone.
I guess you would also need to have the ECU re-mapped.
The Escort had no ECU but a retard-on-boost distributor was fitted to stop pinking.
Twas a lot of fun 
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD 
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pinto
Full Member
TD04 on a galaxy manifold ? whooooooosh !
Posts: 474
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Re: turboing bob?
« Reply #2 on: Sep 23rd, 2008, 9:09pm » |
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Unless you own a MGF woofter chariot or a rich boy elise, Turbo Technics will sadly no longer give you the time of day 
If you wish to persue the turbo route, then you'll need to talk to Allen Jeffries Motorsport (who took all the old TT stuff over lock stock) or to Fitzroy Pinnock at Top Boss Tuning - they have the lowdown on tuning the BOA or BOB engine
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Matt
Senior Member
Manual'd and a 4.0 in the making
Posts: 2816
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Re: turboing bob?
« Reply #3 on: Sep 24th, 2008, 6:40pm » |
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no the BOA exhaust manifols have a different bolt hole pattern but they can be machined to fit.
you need to lower the compression and possibly fit vectra injectors to give a good flow rate.
then theres tapping an oil suppy off for the turbo bearings and do they have internal waste gates cuz you need all the piping and stuff if they aint?
then you need to make room for the intercooler
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FDS2000 Scans - Birmingham
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: turboing bob?
« Reply #4 on: Sep 24th, 2008, 10:28pm » |
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Have you considered just changing the injectors and having the ECU re-mapped ?
Might be a whole lot less work and can deliver quite a bit of extra power.
Probably won't improve the fuel economy though 
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD
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kyanther
Newbie
cosworth 24v
Posts: 38
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Re: turboing bob?
« Reply #5 on: Oct 20th, 2008, 2:40pm » |
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thanks for your answers, and sorry its been a while, (had a few family probs etc)
1, new manifolds now made and wastegates etc all there.
2, thinking of tapping oil off from coolerfeed behind filter?
3, changing ecu to emerald
4, yes to vectra inj.
5, have done mt75 conversion. 2.8 fly. cos. padle clutch.
6, taken all aircon off.
really need to know if theres enough metal to take out of head to lower comp. or do i need to go for lower comp. pistons?
was also thinking if was pos to do away with egr system as i'm going emerald and will have full control of fueling etc? any opinions?
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Scorpio_Mike
Senior Member
Jeep Grand Cherokee 3.0 V6 & 2.8 Sierra XR4i 4x4
Posts: 2354
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Re: turboing bob?
« Reply #6 on: Oct 20th, 2008, 4:18pm » |
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When I turbo'd my XR3 the oil supply was taken from where the oil pressure sensor screwed into the cylinder block - basically a T-piece was added to take both the oil pressure switch and the oil feed pipe to the turbo.
Also recommend that you add an oil cooler / thermostat.
Assuming the oil filter fits on the block in the same place as on the standard cologne V6 in which case the oil cooler from a 2.8i Capri or Sierra XR4i which links in with the cooling system may be of interest.
Reduce the CR by machining the tops of the pistons rather than the heads.
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD
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pinto
Full Member
TD04 on a galaxy manifold ? whooooooosh !
Posts: 474
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Re: turboing bob?
« Reply #7 on: Oct 20th, 2008, 10:09pm » |
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Just a few points to add
Vectra Injectors wont fit. BOB uses side fed injectors, not top fed like the BOA or 24V vectra. To use these, you'd need to make custom fuel rails. Might be worth looking into injectors generally tho, as your use of emerald management will allow you to use completely different injectors in the right cc flow range for your application - perhaps Nissan Skyline, Porsche ? who can tell ?
I'd consider fitting one of those billet ally take off plates for the turbo oil returns.
Finally, on the subject of CR, do you need to alter factory standard ? Im not 100% sure of the CR of a BOB, but the standard 6 pot is about 9:1, which should hold 10psi till the end of time without modification.
Keeping the boost lower will mean less stress on the engine overall, and i'd guestimate a BOB at 10psi without EGR, decatted and with a decent 3in straight thru pipe system should be pushing well over 300bhp.
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