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58 Posts Member #: 1724 PRIZE WANKER. |
16th May, 2007 at 12:24:13pm
What normal & max boosts are y'all using ?
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1303 Posts Member #: 30 Post Whore Epsom, Surrey |
16th May, 2007 at 12:31:05pm
i use super unleaded and run 10psi normal and up to 20psi
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58 Posts Member #: 1724 PRIZE WANKER. |
16th May, 2007 at 12:33:00pm
On 16th of May, 2007 at 12:31pm Turbo Shed said:
i use super unleaded and run 10psi normal and up to 20psi i dont see the relavence of fuel against boost though. Higher RON helps prevent det ! When you say 10 psi do you mean 10 psi gauge? i.e. 0.66 bar ? see also http://www.turbominis.co.uk/forums/index.php?p=vt&tid=152826 Edited by ppj_racing on 16th May, 2007. |
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1303 Posts Member #: 30 Post Whore Epsom, Surrey |
16th May, 2007 at 12:50:40pm
higher Ron may help reduce det but so does a low compression ratio or a good intercooler or if its well set up etc etc etc.
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58 Posts Member #: 1724 PRIZE WANKER. |
16th May, 2007 at 01:07:59pm
On 16th of May, 2007 at 12:50pm Turbo Shed said:
higher Ron may help reduce det but so does a low compression ratio What's your Base CR then ? |
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58 Posts Member #: 1724 PRIZE WANKER. |
16th May, 2007 at 01:14:13pm
On 16th of May, 2007 at 12:50pm Turbo Shed said:
higher Ron may help reduce det but so does a low compression ratio or a good intercooler or if its well set up etc etc etc. high Ron fuel in a standard metro turbo engine will allow a bit more boost (depending on how high the Ron is) but a decent engine with all the bells and wistles can run higher boost on standard pump fuel and yes 10 to 20 Psi is gauge pressure, if i'm right then if that was actual pressure then 10psi would be -5psi gauge so is a vacum Yup, off-boost your gauge should show a negative figure Most n-a engines have a volumetric efficiency well below 100 ..so when your boost gauge shows O psi, you have 100 VE and can get-on with some serious boosting Provided the other hardware can stand-it, espesh temp as you say, if you use a RON of 120 ,, or some Avgas (even 100LL) or better, xylene or even better methanol (runs cooler + much more power), you can run a base CR of say 7.8 i.e. 15.6 at 1 bar boost and get better results. That said, a lower Base CR does give you less lag and less power How much are you getting at the wheels? |
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 2909 Posts Member #: 83 Post Whore Glasgow, Scotland |
16th May, 2007 at 01:29:21pm
On 16th of May, 2007 at 01:14pm ppj_racing said:
your boost gauge shows O psi, you have 100 VE and can get-on with some serious boosting ??? any horribly inefficient engine can achieve 0psi(gauge) in the inlet, it is completely irrelevent to the VE of the engine or am i missing your point? turbo 16v k-series 11.9@118.9 :)
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1303 Posts Member #: 30 Post Whore Epsom, Surrey |
16th May, 2007 at 01:31:55pm
my C/R is 8:1 and i have tried 116ron fuel and it makes it run nice but make no real difference on the strip but then i only ajusted the mixture a bit.
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
16th May, 2007 at 01:53:15pm
On 16th of May, 2007 at 01:29pm evolotion said:
On 16th of May, 2007 at 01:14pm ppj_racing said:
your boost gauge shows O psi, you have 100 VE and can get-on with some serious boosting ??? any horribly inefficient engine can achieve 0psi(gauge) in the inlet, it is completely irrelevent to the VE of the engine or am i missing your point? I don't get this either... 
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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 2742 Posts Member #: 637 Post Whore Hertfordshire |
16th May, 2007 at 04:16:38pm
On 16th of May, 2007 at 01:14pm ppj_racing said:
That said, a lower Base CR does give you less lag and less power i always thought lower CR gave you MORE lag and less power? My build thread..
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 1566 Posts Member #: 36 Post Whore Basingstoke |
16th May, 2007 at 04:34:24pm
yeah, i thought that too. Higher cr mean's it will behave like a 'normal' engine off boost. Low cr engines are usually crap off boost (which i assume will make it more laggy) then take of like a rocket when the turbo spools.
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2742 Posts Member #: 637 Post Whore Hertfordshire |
16th May, 2007 at 04:38:18pm
im planing on using a t2 (eventualy a hybrid one) with a cr of 8.29:1.
My build thread..
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3594 Posts Member #: 655 Post Whore Northern Ireland |
16th May, 2007 at 06:10:26pm
Lots of odd info here....
9.85 @ 145mph
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 6274 Posts Member #: 509 Post Whore Isle of Man |
16th May, 2007 at 08:09:25pm
the way i look at boost is that its a neccesary evil to get more power, the less you have to use, the better
"Turbo's make torque, and torque makes fun"
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2909 Posts Member #: 83 Post Whore Glasgow, Scotland |
16th May, 2007 at 08:16:11pm
my car was tuned simply by getting the CR as low as i could, and then running as much boost as i could on supermarket 95 ron fuel, that way my car can produce 100% of its potential power 100% of the time. i view special fiels like i view nitrous, cheating Edited by evolotion on 16th May, 2007. turbo 16v k-series 11.9@118.9 :)
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 4559 Posts Member #: 786 Post Whore Bermingum |
16th May, 2007 at 08:49:49pm
Hi,
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58 Posts Member #: 1724 PRIZE WANKER. |
17th May, 2007 at 03:58:53pm
On 16th of May, 2007 at 01:29pm evolotion said:
??? any horribly inefficient engine can achieve 0psi(gauge) in the inlet, it is completely irrelevent to the VE of the engine or am i missing your point? I quote " a VE over 95% is excellent, and 100% is achievable, but quite difficult. Only the best of the best can exceed 110%, and that is by means of extremely specialized development of the complex system comprised of the intake passages, combustion chambers, exhaust passages and valve system components. Generally, the RPM at peak VE coincides with the RPM at the torque peak. And generally, automotive engines rarely exceed 90% VE. " so, if your Racing Team's inefficient engines are easily achieving 100% VE, can we have one please? It'd be a much better starting point than our 95-98% one |
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2909 Posts Member #: 83 Post Whore Glasgow, Scotland |
17th May, 2007 at 09:50:33pm
On 16th of May, 2007 at 01:14pm ppj_racing said:
so when your boost gauge shows O psi, you have 100 VE you said 0 psi(gauge) in the inlet = 100% ve. i know 100% ve in nat-asp form is a very admirable target, that wasnt what i was querying. turbo 16v k-series 11.9@118.9 :)
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58 Posts Member #: 1724 PRIZE WANKER. |
19th May, 2007 at 04:20:39pm
On 16th of May, 2007 at 06:10pm stevieturbo said:
Wasnt it mentioned here recently that Avgas is actually pretty crap as a performance fuel ? Lots of turbo guys with SERIOUS motors still use Avgas even the 100LL enhance with a tad of xylene, isoprene and/or meths. Anything that gives you a RON of over 107 is OK. |
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58 Posts Member #: 1724 PRIZE WANKER. |
19th May, 2007 at 04:26:57pm
On 16th of May, 2007 at 08:16pm evolotion said:
my car was tuned simply by getting the CR as low as i could, and then running as much boost as i could on supermarket 95 ron fuel, that way my car can produce 100% of its potential power 100% of the time. i view special fiels like i view nitrous, cheating  as last time i checked my local BP had neither methanol or N2O at the pump :)Do yourself (and your engine) a favour and use Shell Optimax at least |
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58 Posts Member #: 1724 PRIZE WANKER. |
19th May, 2007 at 04:31:09pm
On 16th of May, 2007 at 01:31pm Turbo Shed said:
my C/R is 8:1 and i have tried 116ron fuel and it makes it run nice but make no real difference on the strip but then i only ajusted the mixture a bit. its not been on the rollers for some time, last time it was 130bannanas and befor that it had 150 but felt the same (different places) and at thats at the flywheel You'd notice that nice RON 116 would prevent det if you boosted higher Some said "Max boost is meaningless" .. can't remember what planet they were from, though 
As for your 130 bhp, what capacity engine and what boost? Nice base CR though. |
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58 Posts Member #: 1724 PRIZE WANKER. |
19th May, 2007 at 04:34:27pm
On 16th of May, 2007 at 06:10pm stevieturbo said:
Lots of odd info here.... Bottom line is, you want to use the minium amount of boost, the cheapest fuel and the highest CR, to make the most power you can. Seems completely back-to-front to me, especially using cheapo fuel. If you're not going to boost much use a supercharger instead, and leave turboing to the real racers |
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2909 Posts Member #: 83 Post Whore Glasgow, Scotland |
19th May, 2007 at 04:43:48pm
On 19th of May, 2007 at 04:26pm ppj_racing said:
On 16th of May, 2007 at 08:16pm evolotion said:
my car was tuned simply by getting the CR as low as i could, and then running as much boost as i could on supermarket 95 ron fuel, that way my car can produce 100% of its potential power 100% of the time. i view special fiels like i view nitrous, cheating as last time i checked my local BP had neither methanol or N2O at the pump :)Do yourself (and your engine) a favour and use Shell Optimax at least appreciate the concern but no, the car is a daily drive (well currentl off the road for some minor rot sorting) i have built engiens in the past that relied on 97+ octane, and found myself caught out on a few occations. However when i know im going to be giving it lots of large i will run super unleaded purely for the extra safety :) turbo 16v k-series 11.9@118.9 :)
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
19th May, 2007 at 06:27:28pm
PPJ - no one else has said it, so I will.
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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3594 Posts Member #: 655 Post Whore Northern Ireland |
20th May, 2007 at 06:51:28pm
On 19th of May, 2007 at 04:34pm ppj_racing said:
Seems completely back-to-front to me, especially using cheapo fuel. If you're not going to boost much use a supercharger instead, and leave turboing to the real racers From reading through this thread...I understand why you dont agree 
Cheapo fuel ??? 99% of people here drive road cars. Filling up with exotic fuels would be rather expensive for a road car. Besides, ive never had a problem making power on regular SUL fuel. You could easily make enough power on SUL to blow an A-series apart.. Boost boost boost...it isnt all about boost. Its about making power....using higher compression and lower boost, will generally be more efficient. So why go lower CR than you need to in order to achieve your goals ? Fuel economy, low end response etc will all suffer with lower CR's, which for a road car, are all important things. Perhaps for a race car they may not matter as much...but so many here arent race cars. They may race them on occasion though. But its not the same thing. 9.85 @ 145mph
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