Rick Draper
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Registered: 10th Feb 01
Location: Cheshire
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quote:
Originally posted by jr
quote:
Originally posted by Rick Draper
quote:
Originally posted by VXR
quote:
Originally posted by jr
i like the way everyone talks about lag, but actully has no idea what spec it is
if its got a marem (sp) shaft and is full bb, it will spool up earlier anyway, and if its running Anti-Lag, and various other things it wont matter
also, it seems who ever is building it, doesnt mind spending £££, so at a guess the rest of the engine spec will be suited to a turbo of that size
At that size its still going to take a fair while to spool up. Not only that, especially with the length of that exhaust manifold. Its only a diddy 2.0 remember so needs some serious revving to get the turbo spinning right.
Can't see why on earth you would want antilag on the road. Expensive kit which leads to expensive replacements.
At what size? Do you know what AR the inlet and exhaust housings are? Do you know what the trim of the turbo is? Do you know what CR or cam spec its on? Do you know what CC the engine will be?
my follow up post was actuly look at rick drapers engine and turbo, similr in size from what i can see 
Lasted a whole 2k revs to 8k revs in 4th at 2.2 bar boost before it shat its water everywhere due to the big hole in the coscast head! Easy way to force over £1900 worth of repairs and still counting.
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jr
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Registered: 20th May 02
Location: Kent
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im following "THE" thread on mig rick with intrest
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little_duke
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Registered: 21st Aug 06
Location: Tamworth,staffordshire Drives: rover coupe
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suck the leaves off the pavement
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Daimo B
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Registered: 20th Mar 00
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quote:
Originally posted by Rick Draper
At what size? Do you know what AR the inlet and exhaust housings are? Do you know what the trim of the turbo is? Do you know what CR or cam spec its on? Do you know what CC the engine will be?
No, but I can't see where i've ever claimed.
General rule, larger the turbo, longer the lag. Longer the manifold, larger the lag......
At a guess, i'd say between 1998cc and 2089cc........... Unless its running a 2.2 bottom end, otherwise, I see not aluminum block???
Whats the powerband on yours Rick??? Do you have a nice progressive amount of revs to use, like 2000-6000rpm, or does your engine produce all its power at the top of the rev range, giving maybe 2000-3000rpm worth of top end power? I'd like to see a chart of the mapping?????
You've jsut said it let go at 8k.. So does that mean you have good power at 2000rpm like a standard turbo, or does it mean you've got some lag, and that the power comes in all higher up the rev range. As soon as you touch the throttle, it spins straight up and off you go.
Even the astra has a slight amount of lag.
[Edited on 05-02-2008 by VXR]
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Daimo B
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Registered: 20th Mar 00
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quote:
Originally posted by broster
youd be suprised, depening on the turbo spec and rest of the engine spec it may not be that laggy, and as for grip, depends on the suspension, tyres and power delivery, iv driven 350+ bhp escort turbo's and found grip not to be a problem, then iv driven 200bhp turbos and wheel span everywhere
were currently building a 1.6 cvh which will be 400bhp+gas fully stripped out, very light shell, with the correct suspension set up and spec'd engine itll grip very well.
Nice reply, makes a discussion rather than trying to make an argument.
Indeed, you can get power down on a FWD, but not that easily and you cant use all of it.
I.E, even with 237bhp, 1400kg+ driver, turn the TCS off and the Astra will still spin up. The TC aids getting that power down, turn it off, nail the throttle, and it'll spin (obviously). Maybe a 6.8 second 0-60 sprint. Turn the TCS on though, you will see the 6.2 all day long. The TCS makes use of the power rather than wasting it through wheelsping.
Put more power and less weight, its going to be harder to get down. Sure you can feather the throttle in, but then your loosing lots of time as your not applying full power. Its not a bad thing, its just harder to get the power on the road.
Guess its why I like NA engines as the power is far more progressive and you can use all the power on the road, not wasting loads as the front wheels are lighting up.
Thats not to say it can't be done though, but your never going to easily get the power down in a 300+bhp FWD 900kg car.
Already said looking forward for the insanity of it, just not for me in a corsa. Would be better in a bigger shell.
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Rick Draper
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Registered: 10th Feb 01
Location: Cheshire
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Turbo on mine starts to spool up around stock rev's then carries on right through the rev range.
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Daimo B
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Registered: 20th Mar 00
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Graph as requested?
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jr
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Registered: 20th May 02
Location: Kent
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ricks was lived mapped iirc (rick ?) by mark shead, so a dyno graph is unlikley
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Steve X16XE
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Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
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How come? I thought that a live map was done on the rollers. So when all finished the guy just presses print?
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Rick Draper
Member
Registered: 10th Feb 01
Location: Cheshire
User status: Offline
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quote:
Originally posted by Steve X16XE
How come? I thought that a live map was done on the rollers. So when all finished the guy just presses print?
Live mapped on the road and at brunters. It might be seeing a rolling road this time round if its seen as benificial by my mapper. Also its finding a rolling road that will cope and not suffer with loads of wheel spin.
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