UglyBoost91 Posted April 25, 2018 Report Share Posted April 25, 2018 Hey All, Longgg time reader, first time poster! I've run and built cars for other racing avenues, and am looking at getting into chump car! Anyway, I've read the rules to the point I could probably recite them almost by memory, but the VPI index weights alludes me. Case in point: (I know my car or engine engine choices are not conventional racing material, but just look past that for the sake of this argument if you can!) I own an 89 Caprice that will be getting an engine swap, because I like self inflicted misery . Anyone that knows these cars or a quick Wikipedia search will show that between 1989 and 1990, they were INDENTICAL. Same engines, transmission, trim levels, etc. And, even in other years, GM B bodies barely changed ! So, why are they listed as different weights? Make: ChevroletModel: Caprice/ImpalaYear: 1988VPi: 200Car Weight: 3180Original HP: 170New HP: 275Points Added to VPi: 294--->NEW VPI: 494 Make: ChevroletModel: Caprice/ImpalaYear: 1989VPi: 200Car Weight: 3201Original HP: 170New HP: 275Points Added to VPi: 270--->NEW VPI: 470 Make: ChevroletModel: Caprice/ImpalaYear: 1990VPi: 200Car Weight: 3584Original HP: 170New HP: 275Points Added to VPi: 72--->NEW VPI: 272 This makes no sense to me, am I missing something? I feel its a bit unfair that the same car built in 1989 versus 1990 looses almost 200 points? Is the weight table listed somewhere? I would rather not sell the 1989 I own to just get a 1990 because I'm a weirdo who likes big cars ; ) All the best, Eric Quote Link to comment Share on other sites More sharing options...
Snake Posted April 25, 2018 Report Share Posted April 25, 2018 (edited) or.... claim it as the year you want it to be if they really are identical. This doesn't address the issue of the calculator being f'd or that tech doesn't know how to use/apply it. Edited April 25, 2018 by Snake 1 Quote Link to comment Share on other sites More sharing options...
enginerd Posted April 25, 2018 Report Share Posted April 25, 2018 1 hour ago, UglyBoost91 said: So, why are they listed as different weights? Looks like an error. Send an email to michael.chisek@champcar.org pointing out this error and include supporting evidence. 1 Quote Link to comment Share on other sites More sharing options...
Bandit Posted April 26, 2018 Report Share Posted April 26, 2018 G bodies are the same way. Saying that, there is no way a 89 Caprice is 3200. The 90 looks about right for weight. Since they are the same car, just claim a 90 and save the headaches. VIN's are not being checked. Quote Link to comment Share on other sites More sharing options...
karman1970 Posted April 26, 2018 Report Share Posted April 26, 2018 I would say they got the generations off by a year on accident. Reach out to tech and inform them. Automobile-catalog.com shows a '90 V8 at 3803lb, '91 V8 4012. Quote Link to comment Share on other sites More sharing options...
Bandit Posted April 26, 2018 Report Share Posted April 26, 2018 1 minute ago, karman1970 said: I would say they got the generations off by a year on accident. Reach out to tech and inform them. Automobile-catalog.com shows a '90 V8 at 3803lb, '91 V8 4012. 91 was the first whale? Guess I'm getting old as I thought that was 92. Quote Link to comment Share on other sites More sharing options...
Bandit Posted April 26, 2018 Report Share Posted April 26, 2018 Model: Caprice/ImpalaYear: 1991VPi: 250Car Weight: 3584Original HP: 170New HP: 255Points Added to VPi: 52--->NEW VPI: 302 Show the same weight yet less hp is more on the vpi. Must be a difference on the chart. Either way, I'd go Vortec 5.7 versus LT1. Heads actually flow a bit better and if you're doing a cam the LT gives you zero benefit other than the AL heads. Way cheaper and easier to find as well. Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted April 26, 2018 Report Share Posted April 26, 2018 14 hours ago, Bandit said: Model: Caprice/ImpalaYear: 1991VPi: 250Car Weight: 3584Original HP: 170New HP: 255Points Added to VPi: 52--->NEW VPI: 302 Show the same weight yet less hp is more on the vpi. Must be a difference on the chart. Either way, I'd go Vortec 5.7 versus LT1. Heads actually flow a bit better and if you're doing a cam the LT gives you zero benefit other than the AL heads. Way cheaper and easier to find as well. Vpi is 50 points higher to start.... 1 Quote Link to comment Share on other sites More sharing options...
UglyBoost91 Posted May 3, 2018 Author Report Share Posted May 3, 2018 Thanks for all the input. It seems like I would just be better off building the Tree-oh-five. At least it would be a TBI motor, although it looks like the intake probably flows like crap Quote Link to comment Share on other sites More sharing options...
Bandit Posted May 3, 2018 Report Share Posted May 3, 2018 Intake and heads are crap on the TBI's. The 255hp Vortec has a smaller hit on your vpi and is the way I'd go. That boat will want some power. Quote Link to comment Share on other sites More sharing options...
TiredBirds Posted May 3, 2018 Report Share Posted May 3, 2018 On 4/25/2018 at 6:20 PM, UglyBoost91 said: Hey All, Longgg time reader, first time poster! I've run and built cars for other racing avenues, and am looking at getting into chump car! Anyway, I've read the rules to the point I could probably recite them almost by memory, but the VPI index weights alludes me. Case in point: (I know my car or engine engine choices are not conventional racing material, but just look past that for the sake of this argument if you can!) I own an 89 Caprice that will be getting an engine swap, because I like self inflicted misery . Anyone that knows these cars or a quick Wikipedia search will show that between 1989 and 1990, they were INDENTICAL. Same engines, transmission, trim levels, etc. And, even in other years, GM B bodies barely changed ! So, why are they listed as different weights? Make: ChevroletModel: Caprice/ImpalaYear: 1988VPi: 200Car Weight: 3180Original HP: 170New HP: 275Points Added to VPi: 294--->NEW VPI: 494 Make: ChevroletModel: Caprice/ImpalaYear: 1989VPi: 200Car Weight: 3201Original HP: 170New HP: 275Points Added to VPi: 270--->NEW VPI: 470 Make: ChevroletModel: Caprice/ImpalaYear: 1990VPi: 200Car Weight: 3584Original HP: 170New HP: 275Points Added to VPi: 72--->NEW VPI: 272 This makes no sense to me, am I missing something? I feel its a bit unfair that the same car built in 1989 versus 1990 looses almost 200 points? Is the weight table listed somewhere? I would rather not sell the 1989 I own to just get a 1990 because I'm a weirdo who likes big cars ; ) All the best, Eric why do you feel like you need a swap? Is it a 350 car? You can take a 170-190hp 350 to 300+ with very little effort and very little points. I can pretty much guarantee if you show up with that car and a 350 nobody is going to bat an eye. 1 Quote Link to comment Share on other sites More sharing options...
TiredBirds Posted May 3, 2018 Report Share Posted May 3, 2018 11 hours ago, UglyBoost91 said: Thanks for all the input. It seems like I would just be better off building the Tree-oh-five. At least it would be a TBI motor, although it looks like the intake probably flows like crap 305 can make power... the TBI will be a factor, I'd swap it for a 4bbl. We run a 305 in our 84 Trans Am... Quote Link to comment Share on other sites More sharing options...
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