Johnny Posted December 27, 2006 Report Share Posted December 27, 2006 What are the gear ratios on the gearboxes fitted on the 505 turbo's -88? Also, data on Cd-value and frontal area are interesting. I've read that the older 505 turbo's (before 86 I think) have a Cd of 0.41 , and the later 505's have a Cd of 0.37 (because of the little spoiler on the trunklid). I think that this only applies to the euro-models. The only data I've found on the frontal area of 505's are 1.97m2 which is for a 505 sti, but the area should be the same for the turbos? It would be great if anyone could confirm or comment these values! Quote Link to comment Share on other sites More sharing options...
august Posted December 29, 2006 Report Share Posted December 29, 2006 i don't have any official data, but i have also heard the 505's cD range between .41 to .45~ If i rememebr right, the 89 was by far the most drag due to the body kit. Quote Link to comment Share on other sites More sharing options...
Johnny Posted January 7, 2007 Author Report Share Posted January 7, 2007 any idea of the gearratios? I have some from the "Technical description" from Toni's site, but I don't know if all 505 TI had the same gearbox. Here's the data I have anyway, 1: 0,2893 2: 0,4851 3: 0,7109 4: 1,0000 5: 1,2154 Reverse: 0,2863 final drive: 0,2702 At 6500 rpm on the 5:th gear, this would give the car a speed of ~149 mph (if it can rev so high) Someone called "jon mccurry" said in the vectorbd-archives this: both 5spd and automatic top out between 150-155mph-the speedometer on the 505 Turbo stops at 155mph for a reason, that's how fast it will go Source: http://www.vectorbd.com/peugeot/archive/50...0/Dec/0282.html He states later in the thread that the measuring was done with a radar-gun. 155 mph equals 6700-6800 rpm (with standard tyres). As you all know, the rpm-limit is 6500 on these cars so that's not possible with the ratios given above. So, either the ratios are different for the -88 5sp or he's (was) telling a big fat lie. Quote Link to comment Share on other sites More sharing options...
august Posted January 8, 2007 Report Share Posted January 8, 2007 nah its possible for the manual trans turbo's to go faster then 149. joe grubbs knew the gear ratios, and i remember him saying 4th gear @ 6500rpm = 142mph, so 5th is quite a bit faster. I want to say 157mph, but i'm not sure about that figure... Quote Link to comment Share on other sites More sharing options...
Johnny Posted January 8, 2007 Author Report Share Posted January 8, 2007 Interesting. Using the gear ratios above gives a speed of 123mph @6500rpm on the 4:th gear. Which supports what you, this mccurry-guy and Grubbs is saying. I ran some calculations for the wind-drag and the hp needed to maintain 157mph and it was way over 180hp, about 280 actually. Quote Link to comment Share on other sites More sharing options...
august Posted January 9, 2007 Report Share Posted January 9, 2007 Interesting. Using the gear ratios above gives a speed of 123mph @6500rpm on the 4:th gear. Which supports what you, this mccurry-guy and Grubbs is saying. I ran some calculations for the wind-drag and the hp needed to maintain 157mph and it was way over 180hp, about 280 actually. 280hp sounds about right. i think jonathan claimed one of the danielson cars he had would "slam" the rev limiter in 5th. i think that was danielson head + cam, with 17psi boost, and in good tune. maybe 250, and i'm not sure about the slamming jonathan was the one who owned most of the 'project' 505 turbo's that grubbs worked on. i'll have to dig through some manuals and see if i can find some official numbers as far as the gear ratios. Quote Link to comment Share on other sites More sharing options...
Johnny Posted January 9, 2007 Author Report Share Posted January 9, 2007 Allright... that could actully be true. It kinda depends on what drag coefficient the car really had. If I redo the calculations, then you need: 248hp@6500rpm with a Cd of 0.41 242hp@6500rpm with a Cd of 0.40 225hp@6500rpm with a Cd of 0.37. And if we say that the danielson-cam moves the power-peak to 6000rpm instead of 5200 (I don't really know) and you have about 250 hp there, then it could be possible with that setup. The last post was a poor attempt to estimate peak hp from hp @ 6500rpm and probably wasn't close to the truth. If you can find the official data for the gear-ratios, that would be sweet! Then one can calculate optimal revs to change gears (with the help of a powercurve). Quote Link to comment Share on other sites More sharing options...
Toni Lindroos Posted January 11, 2007 Report Share Posted January 11, 2007 I've read that the older 505 turbo's (before 86 I think) have a Cd of 0.41 , and the later 505's have a Cd of 0.37 (because of the little spoiler on the trunklid). I think that this only applies to the euro-models. Here's the data I've collected from French magazines for European 505 sedans: 505 STI (1979-1982): Cx: 0,42 505 STI Danielson 2.2 (1981->): Cx: 0,37 505 STI Danielson V6 (1982->): Cx: 0,37 505 GTI (1983-1985): Cx: 0,37 SCx: 0,72 505 Turbo Injection (1983-1985): Cx: 0,37 SCx: 0,75 505 Turbo Injection "Kit 200 ch" (1984-1985): Cx: 0,365 SCx: 0,748 505 Turbo Injection / V6 / GTI (1986->): Cx: 0,37 SCx: 0,76 Quote Link to comment Share on other sites More sharing options...
Johnny Posted January 11, 2007 Author Report Share Posted January 11, 2007 Thank you Toni! I assume that SCx is the same as Cx multiplyed with frontal area? Quote Link to comment Share on other sites More sharing options...
Toni Lindroos Posted January 11, 2007 Report Share Posted January 11, 2007 Thank you Toni! I assume that SCx is the same as Cx multiplyed with frontal area? Yes. I had some good links somewhere but I can't find them now... But here's something: http://www.auto-innovations.com/site/fr/gchassis-s.html http://www.autozine.org/technical_school/aero/tech_aero.htm Cx = Cd SCx = SCd = S x Cd Quote Link to comment Share on other sites More sharing options...
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