IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: Shimy87 on June 08 2016, 10:33:42 AM
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Right now I have 275/40/17 street tires, on 17x10 rims ( I know, shit for racing) but it is what it is. This summer when funds improve I want to get different tires but stick with the 17 rims I have. With the limited options do you think a 315/35/17 Nitto would fit? I'm sure height will be ok but width might not? Thoughts....pl ease don't reply get different rims, I don't race enough to piss around with that so not an option. I want to work with what I have and do the best I can with that limitation.
Thanks!!
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That is a pretty big jump in width. More than an inch and a half. Will they even fit on the rims you have?
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I thought it was an inch wider, I thought the 10 inch rim might make them a bit narrower and may fit? Might need a spacer to get them away from frame, now I'm really close...3/16
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Tread width don't mean dick...section width is what matters. Okay, the MT 28x10x15C slick has a section width of 11.2 inches...and it fits on my car with the aluminum drums...which are about an 1/8th inch thicker than the cast. Fender lips on my car are NOT rolled...fitme nt is VERY tight. The Nitto 555 you want to go with...has a section width of...12.5. It MAY fit with the fenders rolled and you may or may not have to play with a spacer. The other thing that comes into play is if your rear axle is centered. I'm betting it won't fit.
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I fit 315s on the stock frame, I was told it was impossible. They were wrong. Running a 315 on a 10" rim will make the measured section width about 1/4 to 1/2" narrower than advertised; which should be an 11" rim. Yes, use spacers.
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Ok, thanks. So what is you guys opinion on this, will traction be much different between the 2 sizes, I know the 275/40 fits fine, will I gain much more hook with the bigger tire? Now on the street the current set-up just blows away the tires from idle so maybe at a prepped track I can get to 1-2 lbs of boost....maybe . I'll need better tires so I really appreciate any help you guys can give me!!
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I don't think it will help much. The length of the patch is more important than the width in my experience
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My buddy Mike with the 9 second Camaro tried 17's...best he could do was a 1.6x...and he has the suspension dialed in on that car. He went to a 15...and went into the 1.4's. I'm betting the short sidewall on the 17 is a hindrance.
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Like running wagon wheels
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I did a 1.7 second 60' on 315/35R17 Nitto NT05Rs; but, I am pretty talented. ;)
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These would be awesome: http://www.mandhtires.com/M-H-Drag-Radials/275-50R17#.V1n4taq3M1I (http://www.mandhtires.com/M-H-Drag-Radials/275-50R17#.V1n4taq3M1I)
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A search on the other site says you can cram in a 285/40/18 with the wheel lips rolled.
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So if I went the pain in the ass route and got some 15 steel rims, whats the best rim width and tire size to run? I would just swap out at the track.
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8"W x 4 b.s. wheel
275x60-15
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Like Steve says. 8 inch wide rim...and a 28x9 slick. Girls use DR's. :D
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fixin' to slap Brad up side the head with my freaking purse....
For strip only, Brad is right
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I agree with Steve on this one.
Besides Brad uses front wheel drive slicks so he has to put them on the front.
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That a 2 inch taller tire than what I have on now.....will that put my finish line rpm much lower?
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Yes...your RPM's will be lower with a taller tire.
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Each 1 in of tire height = approx 300 rpm at the stripe so 600 rpm lower.
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Wheres a good place to get a couple steel rims??
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The question is where do you get an 8" wheel with 4" backspacing
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C3 Vette rims? They're a dime a dozen up here.
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Summit has a pretty good filtering system on their website. Just select everything that you want in a wheel and it shows what they can get. A phone call to confirm wouldn't hurt. Here's a link with all the filters in place. I hope it works.
https://www.summitracing.com/search/department/wheels-tires/section/wheels/part-type/wheels/wheel-diameter/15-in/wheel-width-in/8-000-in/wheel-bolt-pattern/5-x-4-3-4-in/wheel-material/steel/backspacing-in/4-000-in?N=4294950865%2B4294920859%2B4294920860%2B4294920795%2B4294920825%2B4294947557%2B4294920856%2B4294920837&SortBy=Default&SortOrder=Ascending (https://www.summitracing.com/search/department/wheels-tires/section/wheels/part-type/wheels/wheel-diameter/15-in/wheel-width-in/8-000-in/wheel-bolt-pattern/5-x-4-3-4-in/wheel-material/steel/backspacing-in/4-000-in?N=4294950865%2B4294920859%2B4294920860%2B4294920795%2B4294920825%2B4294947557%2B4294920856%2B4294920837&SortBy=Default&SortOrder=Ascending)
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Thanks!! I like the cragger black and the price is right!! With a set of Mickeys and rims its about $500. Question is will the half second be worth it. Depends on what my buddys supercharged stang runs :O
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Ran 12.6 - 12.8 all day. Won 6 rounds of bracket to take first plact trophy. Ill post a couple slips tommorrow. Best 60ft was 1.88 with a finish of 12.638 at 105.17mph. Need some tires if I hope to get an 11 slip :) my tune had SM recall 782 at 104 with 0 knock running 24 lbs off the line creeping to 25 by finishline. Couldnt leave with any boost. Tried one launch at 2 lbs and blew away tires. Great time today. Buddys mustang ran 11.5 all day.
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I'm guessing you let off toward the end. 105 isn't much mph for 12.60s. Should be in the 107-108 range. Though with a 1.88 60' it comes on strong to get to the 12.60s
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Looks to me that you have the big end tuned pretty close. No PL log?
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How many mph did it pick up on the last 1/8?
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With that 1.88 and ramping all the way up to 12.6 I would say he is at 78-79 in the eighth and it comes strong on the top end . Just a guess.
With that alcohol it needs more boost and might need a larger injector but more tuning and traction definitely.
Post us a time slip Shimy. And keep up the good work.
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Here's 2 slips, only picks up 19 MPH from the 1/8. No PL logs, just the ol" SM.
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Do you still have the 37# injectors installed? I think you may be getting close to their limits
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yup
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Wow, it sure is movin in the eighth. Lots of mph and a dandy low eight. Easily 7.8 with traction. Sure noses over on the top end. You should be in the 12.20s at 110-111 . How old is the fuel pump? Filter age?
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Pump and filter are old. Maybe 2 years ago checked FP with a gauge and was coming up on pressure 1 lb for every lb of boost. I have a new filter on the shelf, I could slap this in and check it again. if FP is still good what could the issue be? I thought if the fuelling was a problem it would show up in some lean numbers on the SM at higher MPH but lowest number I recalled was 782 at 104mph....that's kinda rich for an alky car isn't it? maybe I'm too rich on the big end? Don't know if this matters but the tires I run are only 26 inches tall....would that effect the top end numbers?
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You did replace the valve springs, didn't you? It's about five mph down in the last half of the run so you have a problem and it would be hard to attribute that to richness.
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I'd have to agree with Steve on the valve springs. Went to comp 981's on the white T and it mad a world of difference at the big end
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The prior owner had replaced them, should it be done again? How long do they last, I have had the car for 7 years. Looked at some slips for 2014 and it was running 108 then
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I ran the 980 springs on the white T and it would run 7.5 in the 1/8 but couldn't go past a 12.3 on the big end. TE44 with 25#'s and 60's on the rail and 1.58 in the 60. Changed the springs to the 981's and 60 foot stayed consistent but the 1\8th dropped to the high 7.2's-7.3's. Never did get a chance to run the 1/4 before selling the car.
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IF you had PL like I've been asking you to get for umpteen months...then we'd be able see if the high gear RPM's are struggling to verify soft valve springs. A 26 inch tire will force the RPM's even higher making the valves float even worse if the springs are soft. If that's a LU convertor...an d it's unlocked...the n your slip rate will likely be higher...lower ing your MPH. I'd try a set of 981's...a 28 inch tire...and try it again. We're taking an educated guess as to what's wrong.
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Yes I know :icon_redface: Its a LU convertor, don't know if its locked?? Probably cant hurt to put new springs in it anyway so I know for sure what I got, they are less than $100. I see a nice simple compression tool for the job on a Tom's turbo garage video, where the heck can I get that one. Cant find it anywhere in my searching.
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It's unlocked...unl ess you asked Eric to lock it via his chip. Ask Chris at CK if you can lock it at WOT for racing. Kirbans may still sell the valve spring tool.
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Looking at that tool, it appears that its just a rocker arm cut out on one end and a bolt and nut welded to the other and a piece of tube to bolt down for it to rock on. I'll make that and I can get 981 springs for about $50.
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Kirban sells the tool if you wanna go that route