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39 Posts Member #: 9431 Member Portugal - Lisbon |
24th May, 2011 at 09:13:30pm
Hi all
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 3329 Posts Member #: 184 Senior Member Melton Mowbray, Pie Country |
24th May, 2011 at 09:33:57pm
Sounds like you have the right idea. What sort of bhp are you aiming for, that will determine a few of you specifications.
http://www.twin-turbo.co.uk
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 824 Posts Member #: 2065 Post Whore Wiltshire |
24th May, 2011 at 09:35:36pm
Is it a race car? Edited by almichie on 24th May, 2011. On 7th Nov, 2011 apbellamy said:
Shaft seems nice and snug On 24th Mar, 2012 apbellamy said:
no no no no, you need more boost! you can never ever come on here and say I have enough boost, that's just silly. On 29th Mar, 2010 Star Mag said:
these give no problems with good head |
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 774 Posts Member #: 6724 Post Whore Wootton Bassett |
24th May, 2011 at 10:58:07pm
I'd imagine that with your warmer weather you'd want to ensure any intercooler is placed in fantastic air-flow, or your cr to be kept a little safer. |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
24th May, 2011 at 11:39:12pm
On 24th May, 2011 Ben H said:
Sounds like you have the right idea. What sort of bhp are you aiming for, that will determine a few of you specifications. We have the same octane fuel here. The CR will be determined by your power needs, I suspect that you will be looking at 8.5:1 ish. As for 998 or 1098 that is up to you. There are plenty of good 1098s out in Austrailer, but here in the uk 998 are more popular small bore turbos. I'm aiming to arround 120 130 if possible,I want it to be as fast as possible. I allways use small bore engines until today,and want to keep it.I like Small bores. I have some good results with 998's very fast road,and 1098's too. but 1098's based engines seems to have a little bit more torque down low in rpm range.if stroke matters and if we don't go to far from 6k and if it helps in torque I think its a good starting point. Someone with more experience might could help Edited by xuminimaniac on 24th May, 2011. |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
24th May, 2011 at 11:42:17pm
On 24th May, 2011 almichie said:
Is it a race car? No mate,it's not a race car but I like and want to use it fast |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
24th May, 2011 at 11:45:50pm
On 24th May, 2011 dan187 said:
I'd imagine that with your warmer weather you'd want to ensure any intercooler is placed in fantastic air-flow, or your cr to be kept a little safer. Temperatures here are a bit warmer is true (winter usualy 10ºC summer 30ºC sometimes a bit more sometimes a bit cold). |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
25th May, 2011 at 07:46:13am
If you are only after 130 then the GT17 is no use to you. it'smore suited to 150+.
Edited by wil_h on 25th May, 2011. Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
25th May, 2011 at 08:33:50am
On 25th May, 2011 wil_h said:
If you are only after 130 then the GT17 is no use to you. it'smore suited to 150+. 120 to 130 will be achievable with a much smaller turbo, and if it's for a road car then you'll want boost at a sensible rpm. A GT1548, or an RHF4 would be a good choice, there are plenty of others. As for re-using the head, what size valves has it got? I use 33/29s, using larger ones gave no gains, only loss in power preboost. It has 36 X 30 valves. I'm after what the engine could make without loss of driveability in low end rpm. |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
25th May, 2011 at 08:51:57am
On 25th May, 2011 xuminimaniac said:
On 25th May, 2011 wil_h said:
If you are only after 130 then the GT17 is no use to you. it'smore suited to 150+. 120 to 130 will be achievable with a much smaller turbo, and if it's for a road car then you'll want boost at a sensible rpm. A GT1548, or an RHF4 would be a good choice, there are plenty of others. As for re-using the head, what size valves has it got? I use 33/29s, using larger ones gave no gains, only loss in power preboost. It has 36 X 30 valves. I'm after what the engine could make without loss of driveability in low end rpm. Then sell that head and buy something more suitable. also if you want drivability a slightly milder cam may be worth considering. I use a 266 in on of my 998s an it's not as nice as the MG metro cam. The metro cam won't restrict power. Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
25th May, 2011 at 09:29:52am
On 25th May, 2011 wil_h said:
On 25th May, 2011 xuminimaniac said:
On 25th May, 2011 wil_h said:
If you are only after 130 then the GT17 is no use to you. it'smore suited to 150+. 120 to 130 will be achievable with a much smaller turbo, and if it's for a road car then you'll want boost at a sensible rpm. A GT1548, or an RHF4 would be a good choice, there are plenty of others. As for re-using the head, what size valves has it got? I use 33/29s, using larger ones gave no gains, only loss in power preboost. It has 36 X 30 valves. I'm after what the engine could make without loss of driveability in low end rpm. Then sell that head and buy something more suitable. also if you want drivability a slightly milder cam may be worth considering. I use a 266 in on of my 998s an it's not as nice as the MG metro cam. The metro cam won't restrict power. I'm gonna put the head for sale. In next few days i'll have a good head I think, It's a A+ small bore casting head and i´ll put some pic's so all can see if more suitable. as I said before I like to drive fast and only dont want it like my last 998 small bore N/A with KC296 sp cam as I only got power about 3500 rpm.before 3500 the engine haven't any kind of power.after 3500 rpm wake up and came the "big-bang" engine until 7.500. If Mg metro (KC 500 right??) cam give good results Vs the 266 cam If we could make 140 instead 120 I don´t mind at all even if it lost a bit of low end. What is your opinion about 998 Vs 1098 stroke? turbos like stroke or as most as "square" Bore X Stroke? Pistons will be MS Hight silicon (998 or 1098 spec) or from Calver ST (I think they're the same) If dish is need is a good go to "move" the dish to exhaust valves? |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
25th May, 2011 at 09:40:00am
Well we use the MG cam and have nearly 180 from a 998.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
25th May, 2011 at 09:56:49am
On 25th May, 2011 wil_h said:
Well we use the MG cam and have nearly 180 from a 998. I would personally stick with the 998 crank, but maybe consider a large overbore (+60 or +80), this will help with spool up. You need to look at some compressor maps fro that power, but from memory the RHF4 will certinally flow enough at a suitable pressure ratio. The GT1548 will too (just had a look). And are this 180 bananas wild? I mean to get 150 from a 998 turbo they will not have low end drive? |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
25th May, 2011 at 09:59:06am
It is a race car, and would not make a nice road car. Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
25th May, 2011 at 10:10:22am
I see.but coud we stick @ 130/140 bananas for a nice very fast road / track day/ hillclimb car?
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
25th May, 2011 at 11:22:11am
3.1 or 3.2 is perfect, I have a 2.9 in mine at the moment, but I thought that the 3.1 was better suited.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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39 Posts Member #: 9431 Member Portugal - Lisbon |
25th May, 2011 at 11:43:29am
Thanks!
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